Bug Report: Log4j2 2.35.0 + Spring Boot 4.0.3 fails to start with opentelemetry-log4j-context-data-2.17-autoconfigure

[jianhao2010303]

Describe the bug

Bug Report: Log4j2 2.35.0 + Spring Boot 4.0.3 fails to start with opentelemetry-log4j-context-data-2.17-autoconfigure

Describe the bug

When using Spring Boot 4.0.3 (which includes Log4j2 2.35.0 by default) together with OpenTelemetry instrumentation:

• opentelemetry-spring-boot-starter:2.23.0

• opentelemetry-log4j-context-data-2.17-autoconfigure:2.23.0

The application cannot start and throws:

 

Observations:

• Application starts normally if OpenTelemetry dependencies are removed.

• Works fine with Logback, only broken with Log4j2 2.35.0.

• Excluding old Log4j2 transitive dependencies from OTel does not resolve the issue.

Environment

• Spring Boot: 4.4.0.3

• Spring Cloud: 2024.0.0

• Log4j2: 2.35.0 (provided by Spring Boot)

• OpenTelemetry Instrumentation: 2.23.0

• Java: 17+

Steps to reproduce

1. Create a Spring Boot 4.4.0.3 project.

2. Use  spring-boot-starter-log4j2 .

3. Add:

• opentelemetry-spring-boot-starter

• opentelemetry-log4j-context-data-2.17-autoconfigure

4. Start the application.

Root Cause Analysis

Log4j2 2.35.0 includes breaking changes in:

•  org.apache.logging.log4j.core.impl.Log4jLogEvent 

•  ThreadContextDataInjector  initialization

OpenTelemetry Log4j2 integration does not support Log4j2 2.35.0+ yet.

Expectation

Please add official support for Log4j2 2.35.0+ to work with the latest Spring Boot 4.4.

Steps to reproduce

Please add official support for Log4j2 2.35.0+ to work with the latest Spring Boot 4.4.

Expected behavior

Please add official support for Log4j2 2.35.0+ to work with the latest Spring Boot 4.4.

Actual behavior

Please add official support for Log4j2 2.35.0+ to work with the latest Spring Boot 4.4.

Javaagent or library instrumentation version

opentelemetry-log4j-context-data-2.17-autoconfigure:2.23.0

Environment

JDK: 17
OS: windows

Additional context

No response

Tip

_{React with 👍 to help prioritize this issue. Please use comments to provide useful context, avoiding +1 or me too, to help us triage it. Learn more here.}

[laurit]

@jianhao2010303 could you provide a minimal application that reproduces the issue

[github-actions]

This issue has been labeled as stale due to lack of activity and needing author feedback. It will be automatically closed if there is no further activity over the next 7 days.