No transactionId anymore in implementation classes of ErrorWebExceptionHandler

[sigriswil]

Spring boot version: 3.3.2
Spring cloud dependencies version: 2023.0.3
sample issue spring cloud gateway repository: https://github.com/sigriswil/spring-gateway-sample

It contains a SpringBoot application that can be started locally. When reaching the endpoint /, it raises an exception which triggers the class GlobalErrorWebExceptionHandler which implements ErrorWebExceptionHandler.

In the main method, Hooks.enableAutomaticContextPropagation() and ContextRegistry.getInstance().registerThreadLocalAccessor(...) are called in FirstGatewayFilter.

Add the MDC's trasactionId to the FirstGatewayFilter, An exception occurs in the SecondGatewayFilterFactory.
transactionId is output from SecondGatewayFilterFactory and FirstGatewayFilter, but transactionId is not output from GlobalErrorWebExceptionHandler.

INFO 48248 --- c.e.s.FirstGatewayFilter: transactionId created. MDC: {transactionId=2e58da57-2f01-4d29-b63d-61b2e9682301}
INFO 48248 --- c.e.s.SecondGatewayFilterFactory: MDC: {transactionId=2e58da57-2f01-4d29-b63d-61b2e9682301}
ERROR 48248 --- c.e.s.GlobalErrorWebExceptionHandler: MDC: null
...
INFO 48248 --- c.e.s.FirstGatewayFilter: doFinally, MDC: {transactionId=2e58da57-2f01-4d29-b63d-61b2e9682301}

[spencergibb]

@jonatan-ivanov maybe has an idea?

[jonatan-ivanov]

Thanks for the issue?

What exactly are you trying to achieve with registerThreadLocalAccessor?

Could you please try the following:

1. Remove enableAutomaticContextPropagation, registerThreadLocalAccessor, and any code that is calling the context propagation API or writes the MDC
2. Remove the dependency: implementation 'io.micrometer:context-propagation'
3. Upgrade Boot to 3.3.6 or 3.4.0
4. Set the spring.reactor.context-propagation property from limited to auto

If this is working, the MDC should contain the traceId which is basically the id of the whole "transaction". If that works for you, you can use it as is, if you want to add custom keys I recommend checking Micrometer Tracing's Baggage API or Reactor Context API and add your custom keys there, the docs should show you how to do it.