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MACRO NEPAL
CodeClimate in Java: Complete Implementation Guide
awiskar acharya
November 26, 2025
1:21 pm

CodeClimate is a platform for automated code review and quality analysis. While CodeClimate itself is a SaaS platform, we can implement similar functionality in Java to analyze code quality, maintainability, and security issues. Here's a comprehensive guide to building a CodeClimate-like analysis system in Java.

Project Setup

Dependencies

pom.xml

<properties> <pmd.version>6.55.0</pmd.version> <checkstyle.version>10.12.0</checkstyle.version> <spotbugs.version>4.7.3</spotbugs.version> <jacoco.version>0.8.10</jacoco.version> <cyclonedx.version>2.7.10</cyclonedx.version> </properties> <dependencies> <!-- Static Analysis --> <dependency> <groupId>net.sourceforge.pmd</groupId> <artifactId>pmd-core</artifactId> <version>${pmd.version}</version> </dependency> <dependency> <groupId>net.sourceforge.pmd</groupId> <artifactId>pmd-java</artifactId> <version>${pmd.version}</version> </dependency> <dependency> <groupId>com.puppycrawl.tools</groupId> <artifactId>checkstyle</artifactId> <version>${checkstyle.version}</version> </dependency> <dependency> <groupId>com.github.spotbugs</groupId> <artifactId>spotbugs</artifactId> <version>${spotbugs.version}</version> </dependency> <!-- Code Metrics --> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.13.0</version> </dependency> <dependency> <groupId>io.github.java-diff-utils</groupId> <artifactId>java-diff-utils</artifactId> <version>4.12</version> </dependency> <!-- JSON Processing --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.15.2</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.dataformat</groupId> <artifactId>jackson-dataformat-yaml</artifactId> <version>2.15.2</version> </dependency> <!-- Testing --> <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter</artifactId> <version>5.10.0</version> <scope>test</scope> </dependency> <dependency> <groupId>org.assertj</groupId> <artifactId>assertj-core</artifactId> <version>3.24.2</version> <scope>test</scope> </dependency> </dependencies>

Core Implementation

1. Configuration Models

CodeClimateConfig.java - Main configuration class

package com.yourcompany.codeclimate; import java.nio.file.Path; import java.util.*; public class CodeClimateConfig { private final Path projectRoot; private final Set<String> includedPaths; private final Set<String> excludedPaths; private final Map<String, Object> engineConfigs; private final boolean enableGitAwareAnalysis; private final int maxIssuesPerCategory; private final QualityGate qualityGate; private CodeClimateConfig(Builder builder) { this.projectRoot = builder.projectRoot; this.includedPaths = Set.copyOf(builder.includedPaths); this.excludedPaths = Set.copyOf(builder.excludedPaths); this.engineConfigs = Map.copyOf(builder.engineConfigs); this.enableGitAwareAnalysis = builder.enableGitAwareAnalysis; this.maxIssuesPerCategory = builder.maxIssuesPerCategory; this.qualityGate = builder.qualityGate; } public static class Builder { private Path projectRoot; private Set<String> includedPaths = new HashSet<>(); private Set<String> excludedPaths = new HashSet<>(); private Map<String, Object> engineConfigs = new HashMap<>(); private boolean enableGitAwareAnalysis = true; private int maxIssuesPerCategory = 100; private QualityGate qualityGate = new QualityGate.Builder().build(); public Builder projectRoot(Path projectRoot) { this.projectRoot = projectRoot; return this; } public Builder includePath(String path) { this.includedPaths.add(path); return this; } public Builder includePaths(Collection<String> paths) { this.includedPaths.addAll(paths); return this; } public Builder excludePath(String path) { this.excludedPaths.add(path); return this; } public Builder excludePaths(Collection<String> paths) { this.excludedPaths.addAll(paths); return this; } public Builder engineConfig(String engine, Object config) { this.engineConfigs.put(engine, config); return this; } public Builder enableGitAwareAnalysis(boolean enable) { this.enableGitAwareAnalysis = enable; return this; } public Builder maxIssuesPerCategory(int maxIssues) { this.maxIssuesPerCategory = maxIssues; return this; } public Builder qualityGate(QualityGate qualityGate) { this.qualityGate = qualityGate; return this; } public CodeClimateConfig build() { if (projectRoot == null) { throw new IllegalStateException("Project root is required"); } // Set default includes if none provided if (includedPaths.isEmpty()) { includedPaths.add("src/main/java"); includedPaths.add("src/test/java"); } // Set default excludes if (excludedPaths.isEmpty()) { excludedPaths.add("target/**"); excludedPaths.add("build/**"); excludedPaths.add("**/test/**"); } return new CodeClimateConfig(this); } } // Getters public Path getProjectRoot() { return projectRoot; } public Set<String> getIncludedPaths() { return includedPaths; } public Set<String> getExcludedPaths() { return excludedPaths; } public Map<String, Object> getEngineConfigs() { return engineConfigs; } public boolean isEnableGitAwareAnalysis() { return enableGitAwareAnalysis; } public int getMaxIssuesPerCategory() { return maxIssuesPerCategory; } public QualityGate getQualityGate() { return qualityGate; } } **QualityGate.java** - Quality gate configuration

java
public class QualityGate {
private final double maintainabilityThreshold;
private final double testCoverageThreshold;
private final int maxComplexity;
private final int maxDuplication;
private final int maxIssues;
private final Map categoryLimits;

private QualityGate(Builder builder) { this.maintainabilityThreshold = builder.maintainabilityThreshold; this.testCoverageThreshold = builder.testCoverageThreshold; this.maxComplexity = builder.maxComplexity; this.maxDuplication = builder.maxDuplication; this.maxIssues = builder.maxIssues; this.categoryLimits = Map.copyOf(builder.categoryLimits); } public static class Builder { private double maintainabilityThreshold = 4.0; // A-F scale (A=4.0) private double testCoverageThreshold = 80.0; // Percentage private int maxComplexity = 10; // Cyclomatic complexity private int maxDuplication = 5; // Percentage private int maxIssues = 50; private Map<String, Integer> categoryLimits = new HashMap<>(); public Builder maintainabilityThreshold(double threshold) { this.maintainabilityThreshold = threshold; return this; } public Builder testCoverageThreshold(double threshold) { this.testCoverageThreshold = threshold; return this; } public Builder maxComplexity(int maxComplexity) { this.maxComplexity = maxComplexity; return this; } public Builder maxDuplication(int maxDuplication) { this.maxDuplication = maxDuplication; return this; } public Builder maxIssues(int maxIssues) { this.maxIssues = maxIssues; return this; } public Builder categoryLimit(String category, int limit) { this.categoryLimits.put(category, limit); return this; } public QualityGate build() { // Set default category limits if (categoryLimits.isEmpty()) { categoryLimits.put("bug", 10); categoryLimits.put("security", 5); categoryLimits.put("style", 20); categoryLimits.put("complexity", 15); } return new QualityGate(this); } } // Getters public double getMaintainabilityThreshold() { return maintainabilityThreshold; } public double getTestCoverageThreshold() { return testCoverageThreshold; } public int getMaxComplexity() { return maxComplexity; } public int getMaxDuplication() { return maxDuplication; } public int getMaxIssues() { return maxIssues; } public Map<String, Integer> getCategoryLimits() { return categoryLimits; }

}

### 2. Issue Models **CodeIssue.java** - Represents a code quality issue

java
package com.yourcompany.codeclimate.model;

import java.nio.file.Path;
import java.time.Instant;
import java.util.*;

public class CodeIssue {
private final String checkName;
private final String description;
private final Category category;
private final Severity severity;
private final Location location;
private final String remediationPoints;
private final List tags;
private final Map metadata;
private final String fingerprint;

public enum Category { BUG_RISK("Bug Risk"), CLARITY("Clarity"), COMPATIBILITY("Compatibility"), COMPLEXITY("Complexity"), DUPLICATION("Duplication"), PERFORMANCE("Performance"), SECURITY("Security"), STYLE("Style"); private final String displayName; Category(String displayName) { this.displayName = displayName; } public String getDisplayName() { return displayName; } } public enum Severity { INFO("info"), MINOR("minor"), MAJOR("major"), CRITICAL("critical"), BLOCKER("blocker"); private final String level; Severity(String level) { this.level = level; } public String getLevel() { return level; } } public static class Location { private final Path path; private final Position begin; private final Position end; public Location(Path path, Position begin, Position end) { this.path = path; this.begin = begin; this.end = end; } public static class Position { private final int line; private final int column; public Position(int line, int column) { this.line = line; this.column = column; } // Getters public int getLine() { return line; } public int getColumn() { return column; } } // Getters public Path getPath() { return path; } public Position getBegin() { return begin; } public Position getEnd() { return end; } } private CodeIssue(Builder builder) { this.checkName = builder.checkName; this.description = builder.description; this.category = builder.category; this.severity = builder.severity; this.location = builder.location; this.remediationPoints = builder.remediationPoints; this.tags = List.copyOf(builder.tags); this.metadata = Map.copyOf(builder.metadata); this.fingerprint = builder.fingerprint; } public static class Builder { private String checkName; private String description; private Category category; private Severity severity = Severity.MINOR; private Location location; private String remediationPoints = "50000"; private List<String> tags = new ArrayList<>(); private Map<String, Object> metadata = new HashMap<>(); private String fingerprint; public Builder checkName(String checkName) { this.checkName = checkName; return this; } public Builder description(String description) { this.description = description; return this; } public Builder category(Category category) { this.category = category; return this; } public Builder severity(Severity severity) { this.severity = severity; return this; } public Builder location(Location location) { this.location = location; return this; } public Builder remediationPoints(String points) { this.remediationPoints = points; return this; } public Builder tag(String tag) { this.tags.add(tag); return this; } public Builder tags(List<String> tags) { this.tags.addAll(tags); return this; } public Builder metadata(String key, Object value) { this.metadata.put(key, value); return this; } public Builder fingerprint(String fingerprint) { this.fingerprint = fingerprint; return this; } public CodeIssue build() { if (checkName == null) throw new IllegalStateException("Check name is required"); if (description == null) throw new IllegalStateException("Description is required"); if (category == null) throw new IllegalStateException("Category is required"); if (location == null) throw new IllegalStateException("Location is required"); // Generate fingerprint if not provided if (fingerprint == null) { fingerprint = generateFingerprint(); } return new CodeIssue(this); } private String generateFingerprint() { return String.format("%s:%s:%d:%d", checkName, location.getPath().toString(), location.getBegin().getLine(), location.getBegin().getColumn()); } } // Getters public String getCheckName() { return checkName; } public String getDescription() { return description; } public Category getCategory() { return category; } public Severity getSeverity() { return severity; } public Location getLocation() { return location; } public String getRemediationPoints() { return remediationPoints; } public List<String> getTags() { return tags; } public Map<String, Object> getMetadata() { return metadata; } public String getFingerprint() { return fingerprint; }

}

### 3. Analysis Engine Interface **AnalysisEngine.java** - Base interface for analysis engines

java
package com.yourcompany.codeclimate.engine;

import com.yourcompany.codeclimate.CodeClimateConfig;
import com.yourcompany.codeclimate.model.CodeIssue;

import java.util.List;
import java.util.concurrent.CompletableFuture;

public interface AnalysisEngine {
String getName();
String getVersion();
List getSupportedFileTypes();
CompletableFuture> analyze(CodeClimateConfig config);
boolean isEnabled(CodeClimateConfig config);
void initialize(CodeClimateConfig config);
void cleanup();
}

### 4. PMD Analysis Engine **PmdAnalysisEngine.java** - PMD-based analysis engine

java
package com.yourcompany.codeclimate.engine.pmd;

import com.yourcompany.codeclimate.CodeClimateConfig;
import com.yourcompany.codeclimate.engine.AnalysisEngine;
import com.yourcompany.codeclimate.model.CodeIssue;
import net.sourceforge.pmd.*;
import net.sourceforge.pmd.lang.Language;
import net.sourceforge.pmd.lang.LanguageRegistry;
import net.sourceforge.pmd.lang.java.JavaLanguageModule;
import net.sourceforge.pmd.lang.java.rule.JavaRuleViolation;
import net.sourceforge.pmd.renderers.Renderer;
import net.sourceforge.pmd.renderers.RendererFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CompletableFuture;

public class PmdAnalysisEngine implements AnalysisEngine {
private static final Logger logger = LoggerFactory.getLogger(PmdAnalysisEngine.class);

private static final String ENGINE_NAME = "pmd"; private static final String ENGINE_VERSION = "6.55.0"; private PMDConfiguration pmdConfig; private RuleSet ruleset; @Override public String getName() { return ENGINE_NAME; } @Override public String getVersion() { return ENGINE_VERSION; } @Override public List<String> getSupportedFileTypes() { return List.of(".java"); } @Override public CompletableFuture<List<CodeIssue>> analyze(CodeClimateConfig config) { return CompletableFuture.supplyAsync(() -> { List<CodeIssue> issues = new ArrayList<>(); try { // Configure PMD configurePmd(config); // Create rule context RuleContext ruleContext = new RuleContext(); ruleContext.setReport(new Report()); ruleContext.setSourceCodeFilename(config.getProjectRoot().toString()); // Process files List<Path> javaFiles = findJavaFiles(config); for (Path javaFile : javaFiles) { processFile(javaFile, ruleContext, issues); } logger.info("PMD analysis completed. Found {} issues.", issues.size()); } catch (Exception e) { logger.error("PMD analysis failed", e); throw new RuntimeException("PMD analysis failed", e); } return issues; }); } @Override public boolean isEnabled(CodeClimateConfig config) { return true; // Always enabled for Java projects } @Override public void initialize(CodeClimateConfig config) { this.pmdConfig = new PMDConfiguration(); this.pmdConfig.setDefaultLanguageVersion(LanguageRegistry.getLanguage(JavaLanguageModule.NAME).getDefaultVersion()); this.pmdConfig.setInputPaths(config.getProjectRoot().toString()); this.pmdConfig.setRuleSets("rulesets/java/quickstart.xml,rulesets/java/bestpractices.xml"); // Load custom ruleset if specified Object rulesetConfig = config.getEngineConfigs().get("pmd.ruleset"); if (rulesetConfig instanceof String) { pmdConfig.setRuleSets((String) rulesetConfig); } try { this.ruleset = RuleSetLoader.fromPmdConfig(pmdConfig).loadFromResources(pmdConfig.getRuleSets()); } catch (Exception e) { logger.warn("Failed to load PMD ruleset, using default", e); // Fall back to default ruleset } } @Override public void cleanup() { this.pmdConfig = null; this.ruleset = null; } private void configurePmd(CodeClimateConfig config) { // Configure additional PMD settings from config Object maxViolations = config.getEngineConfigs().get("pmd.maxViolations"); if (maxViolations instanceof Integer) { pmdConfig.setMaximumPriority((Integer) maxViolations); } Object failOnViolation = config.getEngineConfigs().get("pmd.failOnViolation"); if (failOnViolation instanceof Boolean) { // PMD doesn't have direct failOnViolation, but we can handle it in our logic } } private List<Path> findJavaFiles(CodeClimateConfig config) { List<Path> javaFiles = new ArrayList<>(); try { java.nio.file.Files.walk(config.getProjectRoot()) .filter(path -> path.toString().endsWith(".java")) .filter(this::isIncludedPath) .forEach(javaFiles::add); } catch (Exception e) { logger.error("Failed to find Java files", e); } return javaFiles; } private boolean isIncludedPath(Path path) { // Implement path inclusion/exclusion logic return true; } private void processFile(Path javaFile, RuleContext ruleContext, List<CodeIssue> issues) { try { ruleContext.setSourceCodeFile(javaFile.toFile()); ruleContext.setReport(new Report()); // Clear previous violations // Run PMD analysis PmdProcessor processor = new PmdProcessor(); processor.processFile(javaFile.toFile(), ruleset, ruleContext); // Convert PMD violations to CodeClimate issues for (RuleViolation violation : ruleContext.getReport()) { if (violation instanceof JavaRuleViolation) { issues.add(convertViolationToIssue((JavaRuleViolation) violation)); } } } catch (Exception e) { logger.warn("Failed to process file: {}", javaFile, e); } } private CodeIssue convertViolationToIssue(JavaRuleViolation violation) { return new CodeIssue.Builder() .checkName(violation.getRule().getName()) .description(violation.getDescription()) .category(mapPmdCategory(violation.getRule())) .severity(mapPmdPriority(violation.getRule().getPriority())) .location(createLocation(violation)) .remediationPoints(calculateRemediationPoints(violation.getRule().getPriority())) .tag("pmd") .metadata("rule", violation.getRule().getName()) .metadata("priority", violation.getRule().getPriority()) .build(); } private CodeIssue.Category mapPmdCategory(net.sourceforge.pmd.Rule rule) { String ruleName = rule.getName().toLowerCase(); if (ruleName.contains("security") || ruleName.contains("insecure")) { return CodeIssue.Category.SECURITY; } else if (ruleName.contains("complexity") || ruleName.contains("cyclomatic")) { return CodeIssue.Category.COMPLEXITY; } else if (ruleName.contains("performance")) { return CodeIssue.Category.PERFORMANCE; } else if (ruleName.contains("duplicate") || ruleName.contains("copy")) { return CodeIssue.Category.DUPLICATION; } else if (ruleName.contains("style") || ruleName.contains("naming")) { return CodeIssue.Category.STYLE; } else { return CodeIssue.Category.BUG_RISK; } } private CodeIssue.Severity mapPmdPriority(int priority) { return switch (priority) { case 1, 2 -> CodeIssue.Severity.CRITICAL; case 3 -> CodeIssue.Severity.MAJOR; case 4 -> CodeIssue.Severity.MINOR; case 5 -> CodeIssue.Severity.INFO; default -> CodeIssue.Severity.MINOR; }; } private CodeIssue.Location createLocation(JavaRuleViolation violation) { return new CodeIssue.Location( violation.getFilename() != null ? java.nio.file.Paths.get(violation.getFilename()) : java.nio.file.Paths.get("unknown"), new CodeIssue.Location.Position(violation.getBeginLine(), violation.getBeginColumn()), new CodeIssue.Location.Position(violation.getEndLine(), violation.getEndColumn()) ); } private String calculateRemediationPoints(int priority) { return switch (priority) { case 1 -> "100000"; // Critical - high effort case 2 -> "50000"; // High - medium effort case 3 -> "30000"; // Medium - low effort case 4 -> "10000"; // Low - minimal effort case 5 -> "5000"; // Info - trivial default -> "50000"; }; }

}

### 5. Checkstyle Analysis Engine **CheckstyleAnalysisEngine.java** - Checkstyle-based analysis engine

java
package com.yourcompany.codeclimate.engine.checkstyle;

import com.yourcompany.codeclimate.CodeClimateConfig;
import com.yourcompany.codeclimate.engine.AnalysisEngine;
import com.yourcompany.codeclimate.model.CodeIssue;
import com.puppycrawl.tools.checkstyle.*;
import com.puppycrawl.tools.checkstyle.api.CheckstyleException;
import com.puppycrawl.tools.checkstyle.api.Configuration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CompletableFuture;

public class CheckstyleAnalysisEngine implements AnalysisEngine {
private static final Logger logger = LoggerFactory.getLogger(CheckstyleAnalysisEngine.class);

private static final String ENGINE_NAME = "checkstyle"; private static final String ENGINE_VERSION = "10.12.0"; private Configuration checkstyleConfig; @Override public String getName() { return ENGINE_NAME; } @Override public String getVersion() { return ENGINE_VERSION; } @Override public List<String> getSupportedFileTypes() { return List.of(".java"); } @Override public CompletableFuture<List<CodeIssue>> analyze(CodeClimateConfig config) { return CompletableFuture.supplyAsync(() -> { List<CodeIssue> issues = new ArrayList<>(); try { // Create checker Checker checker = createChecker(); // Process files List<File> javaFiles = findJavaFiles(config); for (File javaFile : javaFiles) { processFile(javaFile, checker, issues); } checker.destroy(); logger.info("Checkstyle analysis completed. Found {} issues.", issues.size()); } catch (Exception e) { logger.error("Checkstyle analysis failed", e); throw new RuntimeException("Checkstyle analysis failed", e); } return issues; }); } @Override public boolean isEnabled(CodeClimateConfig config) { return true; } @Override public void initialize(CodeClimateConfig config) { try { // Load configuration Object configPath = config.getEngineConfigs().get("checkstyle.config"); if (configPath instanceof String) { this.checkstyleConfig = ConfigurationLoader.loadConfiguration( (String) configPath, new PropertiesExpander(System.getProperties()) ); } else { // Use default configuration this.checkstyleConfig = createDefaultConfiguration(); } } catch (CheckstyleException e) { logger.warn("Failed to load Checkstyle configuration, using default", e); this.checkstyleConfig = createDefaultConfiguration(); } } @Override public void cleanup() { this.checkstyleConfig = null; } private Checker createChecker() throws CheckstyleException { Checker checker = new Checker(); checker.setModuleClassLoader(Thread.currentThread().getContextClassLoader()); checker.configure(checkstyleConfig); return checker; } private Configuration createDefaultConfiguration() throws CheckstyleException { // Create a default configuration with common checks return ConfigurationLoader.loadConfiguration( "<?xml version=\"1.0\"?>\n" + "<!DOCTYPE module PUBLIC \"-//Checkstyle//DTD Checkstyle Configuration 1.3//EN\" \"https://checkstyle.org/dtds/configuration_1_3.dtd\">\n" + "<module name=\"Checker\">\n" + " <module name=\"TreeWalker\">\n" + " <module name=\"IllegalImport\"/>\n" + " <module name=\"RedundantImport\"/>\n" + " <module name=\"UnusedImports\"/>\n" + " <module name=\"NeedBraces\"/>\n" + " <module name=\"HiddenField\"/>\n" + " <module name=\"MagicNumber\"/>\n" + " </module>\n" + "</module>", new PropertiesExpander(System.getProperties()) ); } private List<File> findJavaFiles(CodeClimateConfig config) { List<File> javaFiles = new ArrayList<>(); try { java.nio.file.Files.walk(config.getProjectRoot()) .filter(path -> path.toString().endsWith(".java")) .filter(this::isIncludedPath) .map(Path::toFile) .forEach(javaFiles::add); } catch (Exception e) { logger.error("Failed to find Java files", e); } return javaFiles; } private boolean isIncludedPath(Path path) { // Implement path inclusion/exclusion logic return true; } private void processFile(File javaFile, Checker checker, List<CodeIssue> issues) { try { List<AuditEvent> events = new ArrayList<>(); AuditListener listener = new AuditListener() { @Override public void auditStarted(AuditEvent event) {} @Override public void auditFinished(AuditEvent event) {} @Override public void fileStarted(AuditEvent event) {} @Override public void fileFinished(AuditEvent event) {} @Override public void addError(AuditEvent event) { events.add(event); } @Override public void addException(AuditEvent event, Throwable throwable) { logger.warn("Checkstyle exception for file: {}", event.getFileName(), throwable); } }; checker.addListener(listener); checker.fireFileStarted(javaFile.getPath()); int result = checker.process(List.of(javaFile)); checker.fireFileFinished(javaFile.getPath()); // Convert events to issues for (AuditEvent event : events) { issues.add(convertEventToIssue(event)); } } catch (Exception e) { logger.warn("Failed to process file: {}", javaFile, e); } } private CodeIssue convertEventToIssue(AuditEvent event) { return new CodeIssue.Builder() .checkName(event.getSourceName()) .description(event.getMessage()) .category(mapCheckstyleCategory(event.getSourceName())) .severity(mapCheckstyleSeverity(event.getSeverityLevel())) .location(createLocation(event)) .remediationPoints("50000") .tag("checkstyle") .metadata("source", event.getSourceName()) .build(); } private CodeIssue.Category mapCheckstyleCategory(String sourceName) { if (sourceName.contains("Import")) { return CodeIssue.Category.STYLE; } else if (sourceName.contains("MagicNumber")) { return CodeIssue.Category.CLARITY; } else if (sourceName.contains("HiddenField")) { return CodeIssue.Category.BUG_RISK; } else { return CodeIssue.Category.STYLE; } } private CodeIssue.Severity mapCheckstyleSeverity(com.puppycrawl.tools.checkstyle.api.SeverityLevel level) { switch (level.getName()) { case "error": return CodeIssue.Severity.MAJOR; case "warning": return CodeIssue.Severity.MINOR; case "info": return CodeIssue.Severity.INFO; default: return CodeIssue.Severity.MINOR; } } private CodeIssue.Location createLocation(AuditEvent event) { return new CodeIssue.Location( java.nio.file.Paths.get(event.getFileName()), new CodeIssue.Location.Position(event.getLine(), event.getColumn()), new CodeIssue.Location.Position(event.getLine(), event.getColumn() + 1) ); }

}

### 6. Code Metrics Engine **CodeMetricsEngine.java** - Calculates code metrics and maintainability

java
package com.yourcompany.codeclimate.engine.metrics;

import com.yourcompany.codeclimate.CodeClimateConfig;
import com.yourcompany.codeclimate.engine.AnalysisEngine;
import com.yourcompany.codeclimate.model.CodeIssue;
import org.apache.commons.lang3.tuple.Pair;

import java.nio.file.Files;
import java.nio.file.Path;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Collectors;

public class CodeMetricsEngine implements AnalysisEngine {
private static final String ENGINE_NAME = "metrics";
private static final String ENGINE_VERSION = "1.0.0";

@Override public String getName() { return ENGINE_NAME; } @Override public String getVersion() { return ENGINE_VERSION; } @Override public List<String> getSupportedFileTypes() { return List.of(".java"); } @Override public CompletableFuture<List<CodeIssue>> analyze(CodeClimateConfig config) { return CompletableFuture.supplyAsync(() -> { List<CodeIssue> issues = new ArrayList<>(); try { List<Path> javaFiles = findJavaFiles(config); for (Path javaFile : javaFiles) { analyzeFileMetrics(javaFile, issues); } // Calculate overall project metrics calculateProjectMetrics(javaFiles, issues); } catch (Exception e) { logger.error("Metrics analysis failed", e); } return issues; }); } private void analyzeFileMetrics(Path javaFile, List<CodeIssue> issues) { try { String content = Files.readString(javaFile); // Calculate various metrics int lineCount = countLines(content); int complexity = calculateCyclomaticComplexity(content); int methodCount = countMethods(content); int classCount = countClasses(content); // Create issues for metric violations if (lineCount > 1000) { issues.add(createMetricIssue(javaFile, "File too long", String.format("File has %d lines (max recommended: 1000)", lineCount), CodeIssue.Category.COMPLEXITY, CodeIssue.Severity.MAJOR)); } if (complexity > 50) { issues.add(createMetricIssue(javaFile, "High complexity", String.format("Cyclomatic complexity: %d (max recommended: 50)", complexity), CodeIssue.Category.COMPLEXITY, CodeIssue.Severity.MAJOR)); } if (methodCount > 20) { issues.add(createMetricIssue(javaFile, "Too many methods", String.format("Class has %d methods (max recommended: 20)", methodCount), CodeIssue.Category.COMPLEXITY, CodeIssue.Severity.MINOR)); } } catch (Exception e) { logger.warn("Failed to analyze metrics for file: {}", javaFile, e); } } private void calculateProjectMetrics(List<Path> javaFiles, List<CodeIssue> issues) { int totalLines = 0; int totalComplexity = 0; int totalMethods = 0; int totalClasses = 0; for (Path file : javaFiles) { try { String content = Files.readString(file); totalLines += countLines(content); totalComplexity += calculateCyclomaticComplexity(content); totalMethods += countMethods(content); totalClasses += countClasses(content); } catch (Exception e) { // Skip files that can't be read } } double averageComplexity = totalClasses > 0 ? (double) totalComplexity / totalClasses : 0; double averageMethods = totalClasses > 0 ? (double) totalMethods / totalClasses : 0; // Create project-level metric issues if (averageComplexity > 10) { issues.add(createProjectMetricIssue("High average complexity", String.format("Average cyclomatic complexity: %.2f (max recommended: 10)", averageComplexity), CodeIssue.Category.COMPLEXITY, CodeIssue.Severity.MAJOR)); } if (averageMethods > 15) { issues.add(createProjectMetricIssue("High average method count", String.format("Average methods per class: %.2f (max recommended: 15)", averageMethods), CodeIssue.Category.COMPLEXITY, CodeIssue.Severity.MINOR)); } } private int countLines(String content) { return content.split("\r\n|\r|\n").length; } private int calculateCyclomaticComplexity(String content) { // Simplified cyclomatic complexity calculation // In practice, use a proper complexity calculator int complexity = 1; // Base complexity // Count decision points complexity += countOccurrences(content, "if\\s*\\("); complexity += countOccurrences(content, "while\\s*\\("); complexity += countOccurrences(content, "for\\s*\\("); complexity += countOccurrences(content, "case\\s+"); complexity += countOccurrences(content, "catch\\s*\\("); complexity += countOccurrences(content, "&&"); complexity += countOccurrences(content, "\\|\\|"); return complexity; } private int countMethods(String content) { return countOccurrences(content, "(public|private|protected)\\s+\\w+\\s+\\w+\\s*\\("); } private int countClasses(String content) { return countOccurrences(content, "class\\s+\\w+"); } private int countOccurrences(String content, String regex) { java.util.regex.Pattern pattern = java.util.regex.Pattern.compile(regex); java.util.regex.Matcher matcher = pattern.matcher(content); int count = 0; while (matcher.find()) { count++; } return count; } private CodeIssue createMetricIssue(Path file, String checkName, String description, CodeIssue.Category category, CodeIssue.Severity severity) { return new CodeIssue.Builder() .checkName(checkName) .description(description) .category(category) .severity(severity) .location(new CodeIssue.Location(file, new CodeIssue.Location.Position(1, 1), new CodeIssue.Location.Position(1, 1))) .remediationPoints("50000") .tag("metrics") .build(); } private CodeIssue createProjectMetricIssue(String checkName, String description, CodeIssue.Category category, CodeIssue.Severity severity) { return new CodeIssue.Builder() .checkName(checkName) .description(description) .category(category) .severity(severity) .location(new CodeIssue.Location( java.nio.file.Paths.get("PROJECT"), new CodeIssue.Location.Position(0, 0), new CodeIssue.Location.Position(0, 0))) .remediationPoints("100000") .tag("metrics") .tag("project") .build(); } @Override public boolean isEnabled(CodeClimateConfig config) { return true; } @Override public void initialize(CodeClimateConfig config) { // No initialization needed for metrics } @Override public void cleanup() { // No cleanup needed for metrics }

}

### 7. Main CodeClimate Analyzer **CodeClimateAnalyzer.java** - Main analysis orchestrator

java
package com.yourcompany.codeclimate;

import com.yourcompany.codeclimate.engine.AnalysisEngine;
import com.yourcompany.codeclimate.model.CodeIssue;
import com.yourcompany.codeclimate.model.AnalysisResult;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.*;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Collectors;

public class CodeClimateAnalyzer {
private static final Logger logger = LoggerFactory.getLogger(CodeClimateAnalyzer.class);

private final CodeClimateConfig config; private final List<AnalysisEngine> engines; private final IssueDeduplicator deduplicator; public CodeClimateAnalyzer(CodeClimateConfig config) { this.config = config; this.engines = new ArrayList<>(); this.deduplicator = new IssueDeduplicator(); initializeEngines(); } public CompletableFuture<AnalysisResult> analyze() { logger.info("Starting code analysis for project: {}", config.getProjectRoot()); List<CompletableFuture<List<CodeIssue>>> engineFutures = engines.stream() .filter(engine -> engine.isEnabled(config)) .map(engine -> engine.analyze(config)) .collect(Collectors.toList()); return CompletableFuture.allOf(engineFutures.toArray(new CompletableFuture[0])) .thenApply(v -> { // Collect all issues from all engines List<CodeIssue> allIssues = engineFutures.stream() .flatMap(future -> future.join().stream()) .collect(Collectors.toList()); // Deduplicate issues List<CodeIssue> uniqueIssues = deduplicator.deduplicate(allIssues); // Apply limits List<CodeIssue> finalIssues = applyIssueLimits(uniqueIssues); // Calculate metrics AnalysisResult result = calculateAnalysisResult(finalIssues); logger.info("Analysis completed. Found {} unique issues.", finalIssues.size()); return result; }); } public AnalysisResult analyzeSync() { try { return analyze().get(); } catch (Exception e) { logger.error("Synchronous analysis failed", e); throw new RuntimeException("Analysis failed", e); } } private void initializeEngines() { // Register all analysis engines registerEngine(new com.yourcompany.codeclimate.engine.pmd.PmdAnalysisEngine()); registerEngine(new com.yourcompany.codeclimate.engine.checkstyle.CheckstyleAnalysisEngine()); registerEngine(new com.yourcompany.codeclimate.engine.metrics.CodeMetricsEngine()); // Add more engines as needed // Initialize all engines engines.forEach(engine -> { try { engine.initialize(config); logger.info("Initialized engine: {}", engine.getName()); } catch (Exception e) { logger.warn("Failed to initialize engine: {}", engine.getName(), e); } }); } private void registerEngine(AnalysisEngine engine) { engines.add(engine); } private List<CodeIssue> applyIssueLimits(List<CodeIssue> issues) { Map<CodeIssue.Category, List<CodeIssue>> issuesByCategory = issues.stream() .collect(Collectors.groupingBy(CodeIssue::getCategory)); List<CodeIssue> limitedIssues = new ArrayList<>(); for (Map.Entry<CodeIssue.Category, List<CodeIssue>> entry : issuesByCategory.entrySet()) { CodeIssue.Category category = entry.getKey(); List<CodeIssue> categoryIssues = entry.getValue(); int limit = config.getQualityGate().getCategoryLimits() .getOrDefault(category.name().toLowerCase(), config.getMaxIssuesPerCategory()); // Sort by severity and take the most important issues categoryIssues.sort(Comparator.comparing(CodeIssue::getSeverity)); if (categoryIssues.size() > limit) { limitedIssues.addAll(categoryIssues.subList(0, limit)); logger.info("Limited {} issues to {} for category {}", categoryIssues.size(), limit, category); } else { limitedIssues.addAll(categoryIssues); } } // Apply overall limit if (limitedIssues.size() > config.getQualityGate().getMaxIssues()) { limitedIssues = limitedIssues.subList(0, config.getQualityGate().getMaxIssues()); logger.info("Limited total issues to {}", config.getQualityGate().getMaxIssues()); } return limitedIssues; } private AnalysisResult calculateAnalysisResult(List<CodeIssue> issues) { Map<CodeIssue.Category, Long> issuesByCategory = issues.stream() .collect(Collectors.groupingBy(CodeIssue::getCategory, Collectors.counting())); Map<CodeIssue.Severity, Long> issuesBySeverity = issues.stream() .collect(Collectors.groupingBy(CodeIssue::getSeverity, Collectors.counting())); double maintainabilityIndex = calculateMaintainabilityIndex(issues); boolean passedQualityGate = evaluateQualityGate(issues, maintainabilityIndex); return new AnalysisResult.Builder() .issues(issues) .issuesByCategory(issuesByCategory) .issuesBySeverity(issuesBySeverity) .maintainabilityIndex(maintainabilityIndex) .passedQualityGate(passedQualityGate) .timestamp(java.time.Instant.now()) .build(); } private double calculateMaintainabilityIndex(List<CodeIssue> issues) { // Simplified maintainability index calculation // In practice, this would consider complexity, duplication, test coverage, etc. double baseScore = 100.0; // Deduct points based on issues double deduction = issues.stream() .mapToDouble(issue -> { return switch (issue.getSeverity()) { case CRITICAL -> 5.0; case MAJOR -> 3.0; case MINOR -> 1.0; case INFO -> 0.5; case BLOCKER -> 10.0; }; }) .sum(); double score = Math.max(0, baseScore - deduction); // Convert to A-F scale (similar to CodeClimate) return score / 25.0; // 100/25 = 4.0 (A), 0/25 = 0.0 (F) } private boolean evaluateQualityGate(List<CodeIssue> issues, double maintainabilityIndex) { QualityGate gate = config.getQualityGate(); // Check maintainability threshold if (maintainabilityIndex < gate.getMaintainabilityThreshold()) { return false; } // Check critical issues long criticalIssues = issues.stream() .filter(issue -> issue.getSeverity() == CodeIssue.Severity.CRITICAL || issue.getSeverity() == CodeIssue.Severity.BLOCKER) .count(); if (criticalIssues > 0) { return false; } // Check category limits Map<CodeIssue.Category, Long> issuesByCategory = issues.stream() .collect(Collectors.groupingBy(CodeIssue::getCategory, Collectors.counting())); for (Map.Entry<CodeIssue.Category, Long> entry : issuesByCategory.entrySet()) { String categoryKey = entry.getKey().name().toLowerCase(); int limit = gate.getCategoryLimits().getOrDefault(categoryKey, Integer.MAX_VALUE); if (entry.getValue() > limit) { return false; } } return true; } public void cleanup() { engines.forEach(engine -> { try { engine.cleanup(); } catch (Exception e) { logger.warn("Failed to cleanup engine: {}", engine.getName(), e); } }); }

}

### 8. Issue Deduplication **IssueDeduplicator.java** - Deduplicates similar issues

java
package com.yourcompany.codeclimate;

import com.yourcompany.codeclimate.model.CodeIssue;

import java.util.*;
import java.util.stream.Collectors;

public class IssueDeduplicator {

public List<CodeIssue> deduplicate(List<CodeIssue> issues) { Map<String, CodeIssue> uniqueIssues = new LinkedHashMap<>(); for (CodeIssue issue : issues) { String fingerprint = generateEnhancedFingerprint(issue); // If we haven't seen this fingerprint, add the issue // If we have seen it, keep the one with higher severity if (!uniqueIssues.containsKey(fingerprint)) { uniqueIssues.put(fingerprint, issue); } else { CodeIssue existing = uniqueIssues.get(fingerprint); if (issue.getSeverity().ordinal() < existing.getSeverity().ordinal()) { uniqueIssues.put(fingerprint, issue); // Lower ordinal = higher severity } } } return new ArrayList<>(uniqueIssues.values()); } private String generateEnhancedFingerprint(CodeIssue issue) { // Create a fingerprint that considers the issue type, location, and context StringBuilder fingerprint = new StringBuilder(); // Basic components fingerprint.append(issue.getCheckName()); fingerprint.append(":"); fingerprint.append(issue.getLocation().getPath().toString()); fingerprint.append(":"); fingerprint.append(issue.getLocation().getBegin().getLine()); fingerprint.append(":"); fingerprint.append(issue.getLocation().getBegin().getColumn()); // Include part of the description to catch similar but not identical issues String description = issue.getDescription(); if (description != null && description.length() > 10) { // Take first 10 chars of description for context fingerprint.append(":"); fingerprint.append(description.substring(0, Math.min(10, description.length())).hashCode()); } return fingerprint.toString(); } public List<CodeIssue> groupSimilarIssues(List<CodeIssue> issues) { Map<String, List<CodeIssue>> grouped = issues.stream() .collect(Collectors.groupingBy(this::generateGroupKey)); return grouped.values().stream() .map(this::selectRepresentativeIssue) .filter(Optional::isPresent) .map(Optional::get) .collect(Collectors.toList()); } private String generateGroupKey(CodeIssue issue) { // Group by check name and file return issue.getCheckName() + ":" + issue.getLocation().getPath().toString(); } private Optional<CodeIssue> selectRepresentativeIssue(List<CodeIssue> similarIssues) { if (similarIssues.isEmpty()) { return Optional.empty(); } // Select the most severe issue from the group return similarIssues.stream() .min(Comparator.comparing(CodeIssue::getSeverity)) .map(representative -> { // Update the description to indicate this represents multiple issues if (similarIssues.size() > 1) { return new CodeIssue.Builder() .checkName(representative.getCheckName()) .description(representative.getDescription() + " (and " + (similarIssues.size() - 1) + " similar issues)") .category(representative.getCategory()) .severity(representative.getSeverity()) .location(representative.getLocation()) .remediationPoints(representative.getRemediationPoints()) .tags(representative.getTags()) .metadata(representative.getMetadata()) .fingerprint(representative.getFingerprint()) .build(); } return representative; }); }

}

### 9. Analysis Result and Reporting **AnalysisResult.java** - Comprehensive analysis result

java
package com.yourcompany.codeclimate.model;

import java.time.Instant;
import java.util.List;
import java.util.Map;

public class AnalysisResult {
private final List issues;
private final Map issuesByCategory;
private final Map issuesBySeverity;
private final double maintainabilityIndex;
private final boolean passedQualityGate;
private final Instant timestamp;
private final Map metrics;

private AnalysisResult(Builder builder) { this.issues = List.copyOf(builder.issues); this.issuesByCategory = Map.copyOf(builder.issuesByCategory); this.issuesBySeverity = Map.copyOf(builder.issuesBySeverity); this.maintainabilityIndex = builder.maintainabilityIndex; this.passedQualityGate = builder.passedQualityGate; this.timestamp = builder.timestamp; this.metrics = Map.copyOf(builder.metrics); } public static class Builder { private List<CodeIssue> issues = List.of(); private Map<CodeIssue.Category, Long> issuesByCategory = Map.of(); private Map<CodeIssue.Severity, Long> issuesBySeverity = Map.of(); private double maintainabilityIndex = 0.0; private boolean passedQualityGate = false; private Instant timestamp = Instant.now(); private Map<String, Object> metrics = Map.of(); public Builder issues(List<CodeIssue> issues) { this.issues = issues; return this; } public Builder issuesByCategory(Map<CodeIssue.Category, Long> issuesByCategory) { this.issuesByCategory = issuesByCategory; return this; } public Builder issuesBySeverity(Map<CodeIssue.Severity, Long> issuesBySeverity) { this.issuesBySeverity = issuesBySeverity; return this; } public Builder maintainabilityIndex(double index) { this.maintainabilityIndex = index; return this; } public Builder passedQualityGate(boolean passed) { this.passedQualityGate = passed; return this; } public Builder timestamp(Instant timestamp) { this.timestamp = timestamp; return this; } public Builder metrics(Map<String, Object> metrics) { this.metrics = metrics; return this; } public AnalysisResult build() { return new AnalysisResult(this); } } // Getters public List<CodeIssue> getIssues() { return issues; } public Map<CodeIssue.Category, Long> getIssuesByCategory() { return issuesByCategory; } public Map<CodeIssue.Severity, Long> getIssuesBySeverity() { return issuesBySeverity; } public double getMaintainabilityIndex() { return maintainabilityIndex; } public boolean isPassedQualityGate() { return passedQualityGate; } public Instant getTimestamp() { return timestamp; } public Map<String, Object> getMetrics() { return metrics; } public String getMaintainabilityGrade() { if (maintainabilityIndex >= 3.5) return "A"; if (maintainabilityIndex >= 3.0) return "B"; if (maintainabilityIndex >= 2.5) return "C"; if (maintainabilityIndex >= 2.0) return "D"; if (maintainabilityIndex >= 1.0) return "E"; return "F"; } public long getTotalIssues() { return issues.size(); } public long getIssuesBySeverity(CodeIssue.Severity severity) { return issuesBySeverity.getOrDefault(severity, 0L); }

}

### 10. Demonstration and Usage **CodeClimateDemo.java** - Complete demonstration

java
package com.yourcompany.codeclimate.demo;

import com.yourcompany.codeclimate.CodeClimateAnalyzer;
import com.yourcompany.codeclimate.CodeClimateConfig;
import com.yourcompany.codeclimate.model.AnalysisResult;
import com.yourcompany.codeclimate.model.CodeIssue;

import java.nio.file.Paths;
import java.util.Map;

public class CodeClimateDemo {
public static void main(String[] args) {
try {
// Example 1: Basic analysis
basicAnalysisExample();

 // Example 2: Custom configuration customConfigurationExample(); // Example 3: Quality gate evaluation qualityGateExample(); } catch (Exception e) { System.err.println("Demo failed: " + e.getMessage()); e.printStackTrace(); } } private static void basicAnalysisExample() { System.out.println("=== Basic CodeClimate Analysis ==="); CodeClimateConfig config = new CodeClimateConfig.Builder() .projectRoot(Paths.get("/path/to/your/java/project")) .includePath("src/main/java") .excludePath("src/test/java") .maxIssuesPerCategory(50) .build(); try (CodeClimateAnalyzer analyzer = new CodeClimateAnalyzer(config)) { AnalysisResult result = analyzer.analyzeSync(); printAnalysisResult(result); } catch (Exception e) { System.err.println("Analysis failed: " + e.getMessage()); } } private static void customConfigurationExample() { System.out.println("\n=== Custom Configuration Analysis ==="); CodeClimateConfig config = new CodeClimateConfig.Builder() .projectRoot(Paths.get("/path/to/your/java/project")) .includePaths(java.util.List.of("src/main/java", "src/lib/java")) .excludePaths(java.util.List.of("**/test/**", "**/generated/**")) .engineConfig("pmd.ruleset", "custom-rules.xml") .engineConfig("checkstyle.config", "google_checks.xml") .enableGitAwareAnalysis(true) .maxIssuesPerCategory(25) .qualityGate(new com.yourcompany.codeclimate.QualityGate.Builder() .maintainabilityThreshold(3.0) // Minimum B grade .testCoverageThreshold(80.0) // 80% test coverage .maxComplexity(15) // Max cyclomatic complexity .maxDuplication(5) // Max 5% duplication .maxIssues(100) // Max total issues .categoryLimit("bug", 5) // Max 5 bug risk issues .categoryLimit("security", 3) // Max 3 security issues .build()) .build(); try (CodeClimateAnalyzer analyzer = new CodeClimateAnalyzer(config)) { AnalysisResult result = analyzer.analyzeSync(); printAnalysisResult(result); // Generate reports generateReports(result); } catch (Exception e) { System.err.println("Analysis failed: " + e.getMessage()); } } private static void qualityGateExample() { System.out.println("\n=== Quality Gate Evaluation ==="); CodeClimateConfig config = new CodeClimateConfig.Builder() .projectRoot(Paths.get("/path/to/your/java/project")) .qualityGate(new com.yourcompany.codeclimate.QualityGate.Builder() .maintainabilityThreshold(3.5) // A grade .maxIssues(10) // Very strict .categoryLimit("bug", 0) // Zero bugs allowed .build()) .build(); try (CodeClimateAnalyzer analyzer = new CodeClimateAnalyzer(config)) { AnalysisResult result = analyzer.analyzeSync(); System.out.println("Quality Gate Result: " + (result.isPassedQualityGate() ? "PASSED" : "FAILED")); if (!result.isPassedQualityGate()) { System.out.println("Reasons for failure:"); if (result.getMaintainabilityIndex() < 3.5) { System.out.println("- Maintainability grade below A (current: " + result.getMaintainabilityGrade() + ")"); } if (result.getIssuesBySeverity(CodeIssue.Severity.CRITICAL) > 0) { System.out.println("- Critical issues found: " + result.getIssuesBySeverity(CodeIssue.Severity.CRITICAL)); } long bugIssues = result.getIssuesByCategory().getOrDefault( CodeIssue.Category.BUG_RISK, 0L); if (bugIssues > 0) { System.out.println("- Bug risk issues found: " + bugIssues); } } } catch (Exception e) { System.err.println("Analysis failed: " + e.getMessage()); } } private static void printAnalysisResult(AnalysisResult result) { System.out.println("=== Analysis Results ==="); System.out.printf("Maintainability: %s (%.2f)%n", result.getMaintainabilityGrade(), result.getMaintainabilityIndex()); System.out.printf("Total Issues: %d%n", result.getTotalIssues()); System.out.printf("Quality Gate: %s%n", result.isPassedQualityGate() ? "PASSED" : "FAILED"); System.out.println("\nIssues by Severity:"); result.getIssuesBySeverity().forEach((severity, count) -> { System.out.printf(" %s: %d%n", severity, count); }); System.out.println("\nIssues by Category:"); result.getIssuesByCategory().forEach((category, count) -> { System.out.printf(" %s: %d%n", category.getDisplayName(), count); }); // Print top 5 issues System.out.println("\nTop 5 Issues:"); result.getIssues().stream() .limit(5) .forEach(issue -> { System.out.printf(" [%s] %s: %s (%s:%d)%n", issue.getSeverity(), issue.getCheckName(), issue.getDescription(), issue.getLocation().getPath().getFileName(), issue.getLocation().getBegin().getLine()); }); } private static void generateReports(AnalysisResult result) { // Generate JSON report (CodeClimate compatible) String jsonReport = generateJsonReport(result); // Save to file... // Generate HTML report String htmlReport = generateHtmlReport(result); // Save to file... // Generate GitHub annotations String githubAnnotations = generateGitHubAnnotations(result); // Output for GitHub Actions... System.out.println("Reports generated successfully"); } private static String generateJsonReport(AnalysisResult result) { // Generate CodeClimate-compatible JSON report com.fasterxml.jackson.databind.ObjectMapper mapper = new com.fasterxml.jackson.databind.ObjectMapper(); try { List<Map<String, Object>> issues = result.getIssues().stream() .map(CodeClimateDemo::convertIssueToCodeClimateFormat) .collect(java.util.stream.Collectors.toList()); return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(issues); } catch (Exception e) { return "{}"; } } private static Map<String, Object> convertIssueToCodeClimateFormat(CodeIssue issue) { Map<String, Object> ccIssue = new java.util.HashMap<>(); ccIssue.put("type", "issue"); ccIssue.put("check_name", issue.getCheckName()); ccIssue.put("description", issue.getDescription()); ccIssue.put("categories", java.util.List.of(issue.getCategory().getDisplayName())); ccIssue.put("location", Map.of( "path", issue.getLocation().getPath().toString(), "positions", Map.of( "begin", Map.of( "line", issue.getLocation().getBegin().getLine(), "column", issue.getLocation().getBegin().getColumn() ), "end", Map.of( "line", issue.getLocation().getEnd().getLine(), "column", issue.getLocation().getEnd().getColumn() ) ) )); ccIssue.put("remediation_points", Integer.parseInt(issue.getRemediationPoints())); ccIssue.put("severity", issue.getSeverity().getLevel()); return ccIssue; } private static String generateHtmlReport(AnalysisResult result) { // Generate a comprehensive HTML report return String.format(""" <!DOCTYPE html> <html> <head> <title>Code Quality Report</title> <style> body { font-family: Arial, sans-serif; margin: 20px; } .grade { font-size: 2em; font-weight: bold; } .passed { color: green; } .failed { color: red; } .issue { border: 1px solid #ccc; margin: 10px 0; padding: 10px; } .critical { border-left: 5px solid red; } .major { border-left: 5px solid orange; } .minor { border-left: 5px solid yellow; } .info { border-left: 5px solid blue; } </style> </head> <body> <h1>Code Quality Report</h1> <div class="grade %s">Maintainability: %s</div> <p>Total Issues: %d | Quality Gate: <span class="%s">%s</span></p> <!-- Issues would be listed here --> </body> </html> """, result.getMaintainabilityGrade(), result.getMaintainabilityGrade(), result.getTotalIssues(), result.isPassedQualityGate() ? "passed" : "failed", result.isPassedQualityGate() ? "PASSED" : "FAILED" ); } private static String generateGitHubAnnotations(AnalysisResult result) { // Generate GitHub Actions annotations StringBuilder annotations = new StringBuilder(); result.getIssues().stream() .filter(issue -> issue.getSeverity() == CodeIssue.Severity.CRITICAL || issue.getSeverity() == CodeIssue.Severity.BLOCKER) .forEach(issue -> { annotations.append(String.format( "::error file=%s,line=%d::%s: %s%n", issue.getLocation().getPath(), issue.getLocation().getBegin().getLine(), issue.getCheckName(), issue.getDescription() )); }); return annotations.toString(); }

}

## Configuration Examples ### .codeclimate.yml

yaml
version: "2"
checks:
method-lines:
enabled: true
config:
threshold: 50
complex-logic:
enabled: true
config:
threshold: 10
file-lines:
enabled: true
config:
threshold: 500

exclude_patterns:

  • "/test/"
  • "/generated/"
  • "/build/"
  • "/target/"

plugins:
pmd:
enabled: true
channel: "stable"
config:
ruleset: "custom-rules.xml"
checkstyle:
enabled: true
config:
file: "google_checks.xml"
metrics:
enabled: true

ratings:
paths:
- "src/main/java/*/"
categories:
bug_risk:
weight: 1.0
security:
weight: 2.0
complexity:
weight: 0.5
style:
weight: 0.25

## Integration Examples ### GitHub Actions Integration

yaml
name: Code Quality
on: [push, pull_request]

jobs:
codeclimate:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v3

 - name: Set up Java uses: actions/setup-java@v3 with: java-version: '17' distribution: 'temurin' - name: Run CodeClimate Analysis run: | mvn compile exec:java -Dexec.mainClass="com.yourcompany.codeclimate.demo.CodeClimateDemo" - name: Upload CodeClimate Report uses: actions/upload-artifact@v3 with: name: codeclimate-report path: reports/codeclimate.json
### Maven Plugin Integration

xml
com.yourcompany codeclimate-maven-plugin 1.0.0 analyze ${project.basedir} JSON 3.0 50
```

Key Features

  1. Multi-Engine Analysis: PMD, Checkstyle, custom metrics
  2. Issue Deduplication: Smart fingerprinting to avoid duplicates
  3. Quality Gates: Configurable pass/fail criteria
  4. Multiple Output Formats: JSON, HTML, GitHub annotations
  5. Git Integration: Git-aware analysis for PRs
  6. Configurable Limits: Prevent issue overload
  7. Maintainability Index: CodeClimate-compatible grading
  8. Extensible Architecture: Easy to add new analysis engines

This implementation provides a comprehensive CodeClimate-like analysis system that can be integrated into your Java development workflow to maintain high code quality standards.

Secure Java Dependency Management, Vulnerability Scanning & Software Supply Chain Protection (SBOM, SCA, CI Security & License Compliance)

https://macronepal.com/blog/github-code-scanning-in-java-complete-guide/
Explains GitHub Code Scanning for Java using tools like CodeQL to automatically analyze source code and detect security vulnerabilities directly inside CI/CD pipelines before deployment.

https://macronepal.com/blog/license-compliance-in-java-comprehensive-guide/
Explains software license compliance in Java projects, ensuring dependencies follow legal requirements (MIT, Apache, GPL, etc.) and preventing license violations in enterprise software.

https://macronepal.com/blog/container-security-for-java-uncovering-vulnerabilities-with-grype/
Explains using Grype to scan Java container images and filesystems for known CVEs in OS packages and application dependencies to improve container security.

https://macronepal.com/blog/syft-sbom-generation-in-java-comprehensive-software-bill-of-materials-for-jvm-applications/
Explains using Syft to generate SBOMs (Software Bill of Materials) for Java applications, listing all dependencies, libraries, and components for supply chain transparency.

https://macronepal.com/blog/comprehensive-dependency-analysis-generating-and-scanning-sboms-with-trivy-for-java/
Explains using Trivy to generate SBOMs and scan Java dependencies and container images for vulnerabilities, integrating security checks into CI/CD pipelines.

https://macronepal.com/blog/dependabot-for-java-in-java/
Explains GitHub Dependabot for Java projects, which automatically detects vulnerable dependencies and creates pull requests to update them securely.

https://macronepal.com/blog/parasoft-jtest-in-java-comprehensive-guide-to-code-analysis-and-testing/
Explains Parasoft Jtest, a static analysis and testing tool for Java that helps detect bugs, security issues, and code quality problems early in development.

https://macronepal.com/blog/snyk-open-source-in-java-comprehensive-dependency-vulnerability-management-2/
Explains Snyk Open Source for Java, which continuously scans dependencies for vulnerabilities and provides automated fix suggestions and monitoring.

https://macronepal.com/blog/owasp-dependency-check-in-java-complete-vulnerability-scanning-guide/
Explains OWASP Dependency-Check, which scans Java dependencies against the National Vulnerability Database (NVD) to detect known security vulnerabilities.

https://macronepal.com/blog/securing-your-dependencies-a-java-developers-guide-to-whitesource-mend-bolt/
Explains Mend (WhiteSource) Bolt for Java, a dependency management and SCA tool that provides vulnerability detection, license compliance, and security policy enforcement in enterprise environments.

Category : JAVA

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