SigNoz is an open-source APM. It helps developers monitor their applications & troubleshoot problems, an open-source alternative to DataDog, NewRelic, etc.

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There are number of tutorials that focus on java specific things too. You can use them as references/guides to implement in your own application.

<https://signoz.io/docs/instrumentation/java/>

<https://signoz.io/blog/opentelemetry-spring-boot/>

<https://signoz.io/opentelemetry/tomcat/>

<https://signoz.io/blog/distributed-tracing-java/>