Distributed Context in Java

Introduction to Distributed Context

Distributed context propagation enables maintaining request-scoped information across service boundaries in microservices architectures. It's essential for tracing, logging, security, and business logic that spans multiple services.

Core Context Models

Context Interface and Implementation

public interface DistributedContext { String getTraceId(); String getSpanId(); String getParentSpanId(); String getVersion(); <T> T get(String key); <T> void put(String key, T value); boolean containsKey(String key); void remove(String key); Map<String, Object> toMap(); void fromMap(Map<String, Object> contextMap); // Headers for propagation Map<String, String> toHeaders(); void fromHeaders(Map<String, String> headers); } public class DefaultDistributedContext implements DistributedContext { private final String traceId; private final String spanId; private final String parentSpanId; private final String version; private final Map<String, Object> baggage; private DefaultDistributedContext(Builder builder) { this.traceId = builder.traceId; this.spanId = builder.spanId; this.parentSpanId = builder.parentSpanId; this.version = builder.version; this.baggage = new ConcurrentHashMap<>(builder.baggage); } @Override public String getTraceId() { return traceId; } @Override public String getSpanId() { return spanId; } @Override public String getParentSpanId() { return parentSpanId; } @Override public String getVersion() { return version; } @Override @SuppressWarnings("unchecked") public <T> T get(String key) { return (T) baggage.get(key); } @Override public <T> void put(String key, T value) { baggage.put(key, value); } @Override public boolean containsKey(String key) { return baggage.containsKey(key); } @Override public void remove(String key) { baggage.remove(key); } @Override public Map<String, Object> toMap() { Map<String, Object> map = new HashMap<>(baggage); map.put("traceId", traceId); map.put("spanId", spanId); map.put("parentSpanId", parentSpanId); map.put("version", version); return map; } @Override public void fromMap(Map<String, Object> contextMap) { baggage.clear(); contextMap.forEach((key, value) -> { if (!"traceId".equals(key) && !"spanId".equals(key) && !"parentSpanId".equals(key) && !"version".equals(key)) { baggage.put(key, value); } }); } @Override public Map<String, String> toHeaders() { Map<String, String> headers = new HashMap<>(); headers.put("X-Trace-Id", traceId); headers.put("X-Span-Id", spanId); headers.put("X-Parent-Span-Id", parentSpanId != null ? parentSpanId : ""); headers.put("X-Context-Version", version); // Serialize baggage baggage.forEach((key, value) -> { if (value instanceof String) { headers.put("X-Baggage-" + key, (String) value); } else { headers.put("X-Baggage-" + key, value.toString()); } }); return headers; } @Override public void fromHeaders(Map<String, String> headers) { baggage.clear(); headers.forEach((key, value) -> { if (key.startsWith("X-Baggage-")) { String baggageKey = key.substring("X-Baggage-".length()); baggage.put(baggageKey, value); } }); } public static class Builder { private String traceId; private String spanId; private String parentSpanId; private String version = "1.0"; private Map<String, Object> baggage = new HashMap<>(); public Builder traceId(String traceId) { this.traceId = traceId; return this; } public Builder spanId(String spanId) { this.spanId = spanId; return this; } public Builder parentSpanId(String parentSpanId) { this.parentSpanId = parentSpanId; return this; } public Builder version(String version) { this.version = version; return this; } public Builder baggage(Map<String, Object> baggage) { this.baggage = baggage; return this; } public Builder addBaggage(String key, Object value) { this.baggage.put(key, value); return this; } public DefaultDistributedContext build() { if (traceId == null) { traceId = generateId(); } if (spanId == null) { spanId = generateId(); } return new DefaultDistributedContext(this); } private String generateId() { return UUID.randomUUID().toString().replace("-", "").substring(0, 16); } } }

Thread-Local Context Management

Context Holder with MDC Integration

public class DistributedContextHolder { private static final ThreadLocal<DistributedContext> CONTEXT_HOLDER = new ThreadLocal<>(); private static final Logger logger = LoggerFactory.getLogger(DistributedContextHolder.class); public static void setContext(DistributedContext context) { if (context == null) { clearContext(); return; } CONTEXT_HOLDER.set(context); // Sync with SLF4J MDC for logging updateMDC(context); logger.debug("Context set for thread: {}", Thread.currentThread().getName()); } public static DistributedContext getContext() { DistributedContext context = CONTEXT_HOLDER.get(); if (context == null) { context = createEmptyContext(); setContext(context); } return context; } public static DistributedContext getContextOrNull() { return CONTEXT_HOLDER.get(); } public static void clearContext() { CONTEXT_HOLDER.remove(); clearMDC(); logger.debug("Context cleared for thread: {}", Thread.currentThread().getName()); } public static boolean hasContext() { return CONTEXT_HOLDER.get() != null; } public static <T> T getFromContext(String key) { DistributedContext context = getContext(); return context.get(key); } public static <T> void putInContext(String key, T value) { DistributedContext context = getContext(); context.put(key, value); updateMDC(context); // Update MDC after modification } private static void updateMDC(DistributedContext context) { // Clear existing MDC MDC.clear(); // Set tracing information MDC.put("traceId", context.getTraceId()); MDC.put("spanId", context.getSpanId()); // Set baggage as MDC context Map<String, Object> baggage = context.toMap(); baggage.forEach((key, value) -> { if (value != null) { MDC.put(key, value.toString()); } }); } private static void clearMDC() { MDC.clear(); } private static DistributedContext createEmptyContext() { return new DefaultDistributedContext.Builder().build(); } // Context propagation for async operations public static Runnable wrap(Runnable task) { DistributedContext currentContext = getContext(); return () -> { DistributedContext originalContext = getContextOrNull(); try { setContext(currentContext); task.run(); } finally { if (originalContext != null) { setContext(originalContext); } else { clearContext(); } } }; } public static <T> Callable<T> wrap(Callable<T> task) { DistributedContext currentContext = getContext(); return () -> { DistributedContext originalContext = getContextOrNull(); try { setContext(currentContext); return task.call(); } finally { if (originalContext != null) { setContext(originalContext); } else { clearContext(); } } }; } }

Spring Boot Integration

Auto-Configuration and Filters

@Configuration @EnableConfigurationProperties(DistributedContextProperties.class) public class DistributedContextAutoConfiguration { @Bean @ConditionalOnMissingBean public DistributedContextFilter distributedContextFilter( DistributedContextProperties properties) { return new DistributedContextFilter(properties); } @Bean @ConditionalOnMissingBean public ContextPropagationInterceptor contextPropagationInterceptor() { return new ContextPropagationInterceptor(); } @Bean public AsyncConfigurer asyncConfigurer() { return new AsyncConfigurer() { @Override public Executor getAsyncExecutor() { ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor(); executor.setCorePoolSize(10); executor.setMaxPoolSize(50); executor.setQueueCapacity(100); executor.setThreadNamePrefix("Async-"); executor.setTaskDecorator(DistributedContextHolder::wrap); executor.initialize(); return executor; } }; } } @Component public class DistributedContextFilter implements Filter { private static final Logger logger = LoggerFactory.getLogger(DistributedContextFilter.class); private final DistributedContextProperties properties; public DistributedContextFilter(DistributedContextProperties properties) { this.properties = properties; } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { if (!(request instanceof HttpServletRequest) || !(response instanceof HttpServletResponse)) { chain.doFilter(request, response); return; } HttpServletRequest httpRequest = (HttpServletRequest) request; HttpServletResponse httpResponse = (HttpServletResponse) response; // Extract context from headers DistributedContext context = extractContextFromHeaders(httpRequest); try { // Set context for current request DistributedContextHolder.setContext(context); // Add context to response headers for downstream services addContextToResponseHeaders(httpResponse, context); chain.doFilter(request, response); } finally { DistributedContextHolder.clearContext(); } } private DistributedContext extractContextFromHeaders(HttpServletRequest request) { DefaultDistributedContext.Builder builder = new DefaultDistributedContext.Builder(); // Extract tracing headers String traceId = getHeader(request, "X-Trace-Id"); String spanId = getHeader(request, "X-Span-Id"); String parentSpanId = getHeader(request, "X-Parent-Span-Id"); String version = getHeader(request, "X-Context-Version"); if (traceId != null) builder.traceId(traceId); if (spanId != null) builder.spanId(spanId); if (parentSpanId != null) builder.parentSpanId(parentSpanId); if (version != null) builder.version(version); // Extract baggage headers Enumeration<String> headerNames = request.getHeaderNames(); while (headerNames.hasMoreElements()) { String headerName = headerNames.nextElement(); if (headerName.startsWith("X-Baggage-")) { String baggageKey = headerName.substring("X-Baggage-".length()); String baggageValue = request.getHeader(headerName); builder.addBaggage(baggageKey, baggageValue); } } return builder.build(); } private void addContextToResponseHeaders(HttpServletResponse response, DistributedContext context) { if (properties.isPropagateResponseHeaders()) { Map<String, String> headers = context.toHeaders(); headers.forEach(response::setHeader); } } private String getHeader(HttpServletRequest request, String headerName) { String value = request.getHeader(headerName); return (value != null && !value.trim().isEmpty()) ? value : null; } } @ConfigurationProperties(prefix = "distributed.context") public class DistributedContextProperties { private boolean enabled = true; private boolean propagateResponseHeaders = true; private List<String> propagateHeaders = Arrays.asList( "X-Trace-Id", "X-Span-Id", "X-Parent-Span-Id", "X-Context-Version", "X-Baggage-*" ); private List<String> sensitiveFields = Arrays.asList("password", "token", "secret"); // Getters and setters public boolean isEnabled() { return enabled; } public void setEnabled(boolean enabled) { this.enabled = enabled; } public boolean isPropagateResponseHeaders() { return propagateResponseHeaders; } public void setPropagateResponseHeaders(boolean propagateResponseHeaders) { this.propagateResponseHeaders = propagateResponseHeaders; } public List<String> getPropagateHeaders() { return propagateHeaders; } public void setPropagateHeaders(List<String> propagateHeaders) { this.propagateHeaders = propagateHeaders; } public List<String> getSensitiveFields() { return sensitiveFields; } public void setSensitiveFields(List<String> sensitiveFields) { this.sensitiveFields = sensitiveFields; } }

HTTP Client Integration

RestTemplate Interceptor

@Component public class ContextPropagationInterceptor implements ClientHttpRequestInterceptor { private static final Logger logger = LoggerFactory.getLogger(ContextPropagationInterceptor.class); @Override public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException { DistributedContext context = DistributedContextHolder.getContext(); if (context != null) { // Propagate context via headers Map<String, String> headers = context.toHeaders(); headers.forEach(request.getHeaders()::set); logger.debug("Propagated context to downstream service: {}", request.getURI().getHost()); } return execution.execute(request, body); } } @Configuration public class RestTemplateConfig { @Bean public RestTemplate restTemplate(ContextPropagationInterceptor interceptor) { RestTemplate restTemplate = new RestTemplate(); // Add context propagation interceptor List<ClientHttpRequestInterceptor> interceptors = new ArrayList<>(restTemplate.getInterceptors()); interceptors.add(interceptor); restTemplate.setInterceptors(interceptors); return restTemplate; } }

WebClient Integration

@Component public class WebClientContextPropagator { public WebClient.Builder contextAwareWebClient(WebClient.Builder builder) { return builder.filter(this::contextPropagationFilter); } private Mono<ClientResponse> contextPropagationFilter(ClientRequest request, ExchangeFunction next) { return Mono.deferContextual(contextView -> { ClientRequest.Builder requestBuilder = ClientRequest.from(request); // Propagate context from ThreadLocal DistributedContext context = DistributedContextHolder.getContext(); if (context != null) { Map<String, String> headers = context.toHeaders(); headers.forEach(requestBuilder::header); } return next.exchange(requestBuilder.build()); }); } } // Reactive context propagation @Component public class ReactiveContextPropagator { public static final String CONTEXT_KEY = "distributedContext"; public <T> Mono<T> withContext(Mono<T> mono) { return Mono.deferContextual(contextView -> { DistributedContext context = contextView.getOrDefault(CONTEXT_KEY, null); if (context != null) { return Mono.fromCallable(() -> { DistributedContextHolder.setContext(context); return null; }).then(mono) .doFinally(signal -> DistributedContextHolder.clearContext()); } return mono; }); } public static Context propagateContext() { DistributedContext context = DistributedContextHolder.getContext(); if (context != null) { return Context.of(CONTEXT_KEY, context); } return Context.empty(); } }

Messaging Integration

Kafka Context Propagation

@Component public class KafkaContextPropagator { private static final String TRACE_HEADER = "traceId"; private static final String SPAN_HEADER = "spanId"; private static final String CONTEXT_PREFIX = "ctx-"; @Autowired private KafkaTemplate<String, Object> kafkaTemplate; public void sendWithContext(String topic, Object message) { sendWithContext(topic, null, message); } public void sendWithContext(String topic, String key, Object message) { DistributedContext context = DistributedContextHolder.getContext(); kafkaTemplate.send(topic, key, message).addCallback( result -> { if (result != null) { // Add context to headers ProducerRecord<String, Object> record = result.getProducerRecord(); addContextToHeaders(record.headers(), context); } }, exception -> { logger.error("Failed to send message to topic: {}", topic, exception); } ); } private void addContextToHeaders(RecordHeaders headers, DistributedContext context) { if (context != null) { headers.add(TRACE_HEADER, context.getTraceId().getBytes()); headers.add(SPAN_HEADER, context.getSpanId().getBytes()); // Add baggage as headers context.toMap().forEach((key, value) -> { if (value != null) { headers.add(CONTEXT_PREFIX + key, value.toString().getBytes()); } }); } } } @Configuration public class KafkaConsumerConfig { @Bean public ConcurrentKafkaListenerContainerFactory<String, Object> contextAwareKafkaListenerContainerFactory( ConsumerFactory<String, Object> consumerFactory) { ConcurrentKafkaListenerContainerFactory<String, Object> factory = new ConcurrentKafkaListenerContainerFactory<>(); factory.setConsumerFactory(consumerFactory); factory.setRecordInterceptor(contextPropagationInterceptor()); return factory; } @Bean public RecordInterceptor<String, Object> contextPropagationInterceptor() { return record -> { DistributedContext context = extractContextFromHeaders(record.headers()); DistributedContextHolder.setContext(context); try { return record; } finally { DistributedContextHolder.clearContext(); } }; } private DistributedContext extractContextFromHeaders(Headers headers) { DefaultDistributedContext.Builder builder = new DefaultDistributedContext.Builder(); Header traceHeader = headers.lastHeader("traceId"); Header spanHeader = headers.lastHeader("spanId"); if (traceHeader != null) { builder.traceId(new String(traceHeader.value())); } if (spanHeader != null) { builder.spanId(new String(spanHeader.value())); } // Extract baggage from headers for (Header header : headers) { if (header.key().startsWith("ctx-")) { String baggageKey = header.key().substring("ctx-".length()); String baggageValue = new String(header.value()); builder.addBaggage(baggageKey, baggageValue); } } return builder.build(); } }

Database Context Propagation

JPA/Hibernate Integration

@Component public class JpaContextPropagator { @EventListener public void handlePreInsert(PreInsertEvent event) { injectContextFields(event.getEntity()); } @EventListener public void handlePreUpdate(PreUpdateEvent event) { injectContextFields(event.getEntity()); } private void injectContextFields(Object entity) { if (entity instanceof ContextAwareEntity) { DistributedContext context = DistributedContextHolder.getContext(); if (context != null) { ((ContextAwareEntity) entity).setTraceId(context.getTraceId()); ((ContextAwareEntity) entity).setContextData(context.toMap()); } } } } @MappedSuperclass public abstract class ContextAwareEntity { @Column(name = "trace_id") private String traceId; @Column(name = "context_data") @Convert(converter = MapToJsonConverter.class) private Map<String, Object> contextData; // Getters and setters public String getTraceId() { return traceId; } public void setTraceId(String traceId) { this.traceId = traceId; } public Map<String, Object> getContextData() { return contextData; } public void setContextData(Map<String, Object> contextData) { this.contextData = contextData; } } @Converter public class MapToJsonConverter implements AttributeConverter<Map<String, Object>, String> { private static final ObjectMapper mapper = new ObjectMapper(); @Override public String convertToDatabaseColumn(Map<String, Object> attribute) { try { return mapper.writeValueAsString(attribute); } catch (JsonProcessingException e) { throw new RuntimeException("Failed to convert map to JSON", e); } } @Override public Map<String, Object> convertToEntityAttribute(String dbData) { try { if (dbData == null || dbData.trim().isEmpty()) { return new HashMap<>(); } return mapper.readValue(dbData, new TypeReference<Map<String, Object>>() {}); } catch (JsonProcessingException e) { throw new RuntimeException("Failed to convert JSON to map", e); } } }

Advanced Context Features

Context Scoping and Management

@Service public class ContextManager { private static final Logger logger = LoggerFactory.getLogger(ContextManager.class); public void runInContext(Runnable task, Map<String, Object> additionalBaggage) { DistributedContext currentContext = DistributedContextHolder.getContext(); DistributedContext newContext = enhanceContext(currentContext, additionalBaggage); DistributedContextHolder.setContext(newContext); try { task.run(); } finally { DistributedContextHolder.setContext(currentContext); } } public <T> T runInContext(Callable<T> task, Map<String, Object> additionalBaggage) { DistributedContext currentContext = DistributedContextHolder.getContext(); DistributedContext newContext = enhanceContext(currentContext, additionalBaggage); DistributedContextHolder.setContext(newContext); try { return task.call(); } catch (RuntimeException e) { throw e; } catch (Exception e) { throw new RuntimeException(e); } finally { DistributedContextHolder.setContext(currentContext); } } public DistributedContext createChildContext() { DistributedContext parentContext = DistributedContextHolder.getContext(); return new DefaultDistributedContext.Builder() .traceId(parentContext.getTraceId()) .parentSpanId(parentContext.getSpanId()) .baggage(new HashMap<>(parentContext.toMap())) .build(); } private DistributedContext enhanceContext(DistributedContext context, Map<String, Object> additionalBaggage) { DefaultDistributedContext.Builder builder = new DefaultDistributedContext.Builder() .traceId(context.getTraceId()) .spanId(context.getSpanId()) .parentSpanId(context.getParentSpanId()) .version(context.getVersion()) .baggage(new HashMap<>(context.toMap())); if (additionalBaggage != null) { additionalBaggage.forEach(builder::addBaggage); } return builder.build(); } public void logContext(String message) { DistributedContext context = DistributedContextHolder.getContext(); if (context != null) { logger.info("[Trace:{}][Span:{}] {}", context.getTraceId(), context.getSpanId(), message); } else { logger.info("{}", message); } } }

Context Validation and Security

@Component public class ContextValidator { public void validateContext(DistributedContext context) { if (context == null) { throw new InvalidContextException("Context cannot be null"); } if (context.getTraceId() == null || context.getTraceId().trim().isEmpty()) { throw new InvalidContextException("Trace ID is required"); } if (context.getSpanId() == null || context.getSpanId().trim().isEmpty()) { throw new InvalidContextException("Span ID is required"); } // Validate baggage size to prevent header overflow Map<String, Object> baggage = context.toMap(); if (baggage.size() > 100) { throw new InvalidContextException("Too much baggage in context"); } // Validate individual baggage size baggage.forEach((key, value) -> { if (value != null && value.toString().length() > 1024) { throw new InvalidContextException( String.format("Baggage value for key '%s' is too large", key)); } }); } public void sanitizeContext(DistributedContext context, List<String> sensitiveFields) { Map<String, Object> baggage = context.toMap(); sensitiveFields.forEach(field -> { if (baggage.containsKey(field)) { baggage.put(field, "***REDACTED***"); } }); } }

Testing Distributed Context

@SpringBootTest @TestPropertySource(properties = { "distributed.context.enabled=true", "distributed.context.propagate-response-headers=true" }) public class DistributedContextTest { @Autowired private DistributedContextFilter contextFilter; @Autowired private ContextPropagationInterceptor interceptor; @Test public void testContextCreation() { DistributedContext context = new DefaultDistributedContext.Builder() .traceId("test-trace-123") .spanId("test-span-456") .addBaggage("user", "test-user") .build(); assertNotNull(context); assertEquals("test-trace-123", context.getTraceId()); assertEquals("test-span-456", context.getSpanId()); assertEquals("test-user", context.get("user")); } @Test public void testThreadLocalPropagation() { DistributedContext context = new DefaultDistributedContext.Builder().build(); DistributedContextHolder.setContext(context); assertEquals(context, DistributedContextHolder.getContext()); DistributedContextHolder.clearContext(); assertNotEquals(context, DistributedContextHolder.getContext()); } @Test public void testAsyncContextPropagation() throws Exception { DistributedContext context = new DefaultDistributedContext.Builder() .traceId("async-trace") .build(); DistributedContextHolder.setContext(context); CompletableFuture<String> future = CompletableFuture.supplyAsync( DistributedContextHolder.wrap(() -> { DistributedContext asyncContext = DistributedContextHolder.getContext(); return asyncContext.getTraceId(); }) ); assertEquals("async-trace", future.get()); } }

Configuration

Application Properties

# application.yml distributed: context: enabled: true propagate-response-headers: true propagate-headers: - "X-Trace-Id" - "X-Span-Id" - "X-Parent-Span-Id" - "X-Context-Version" - "X-Baggage-*" sensitive-fields: - "password" - "token" - "authorization" - "secret" logging: pattern: level: "%5p [%X{traceId:-},%X{spanId:-}]"

Maven Dependencies

<dependencies> <!-- Spring Boot --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.springframework.kafka</groupId> <artifactId>spring-kafka</artifactId> </dependency> <!-- JSON Processing --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> </dependency> </dependencies>

Conclusion

This distributed context implementation provides:

Cross-Service Context Propagation - Maintain context across HTTP, messaging, and database boundaries
Thread-Local Management - Automatic context handling with cleanup
Async Support - Context propagation for CompletableFuture and reactive programming
Integration Frameworks - Spring Boot, Kafka, JPA, and WebClient integration
Security and Validation - Context validation and sensitive data handling
Observability - MDC integration for structured logging

The system ensures that distributed tracing, user context, and business data are consistently available throughout the entire request lifecycle in microservices architectures.

Java Observability, Logging Intelligence & AI-Driven Monitoring (APM, Tracing, Logs & Anomaly Detection)

https://macronepal.com/blog/beyond-metrics-observing-serverless-and-traditional-java-applications-with-thundra-apm/
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https://macronepal.com/blog/lightstep-java-sdk-distributed-tracing-and-observability-implementation/
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https://macronepal.com/blog/honeycomb-io-beeline-for-java-complete-guide-2/
Explains Honeycomb Beeline for Java, which provides high-cardinality observability and deep query capabilities to understand complex system behavior and debug distributed systems efficiently.

https://macronepal.com/blog/lumigo-for-serverless-in-java-complete-distributed-tracing-guide-2/
Explains Lumigo for Java serverless applications, offering automatic distributed tracing, log correlation, and error tracking to simplify debugging in cloud-native environments. (Lumigo Docs)

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https://macronepal.com/blog/titliel-java-logging-best-practices/
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