Run Maven Surefire tests in JDWP wait-for-debugger mode with a suspendable port.
npx skills add https://github.com/eclipse-rdf4j/rdf4j --skill debug-surefire
Please help me install this Agent Skill. Skill: debug-surefire Source: https://github.com/eclipse-rdf4j/rdf4j/tree/main/.codex/skills/debug-surefire Command: npx skills add https://github.com/eclipse-rdf4j/rdf4j --skill debug-surefire
Debugging Maven Surefire unit tests can be painful when tests run in forked JVMs. This Skill provides a workflow to run tests in JDWP wait-for-debugger mode and attach a debugger easily.
Invoke the skill to start a suspended test run for a class, and attach your debugger to the printed port.
High-intent search queries and answers about installing and using this skill.
To debug Maven Surefire tests in a forked JVM, you launch Surefire in JDWP suspend mode to pause execution and attach a debugger to the exposed localhost port. This allows step-through debugging of your test classes or methods.
Yes, you can attach jdb to a Maven test running in wait-for-debugger mode. The process launches Surefire with JDWP enabled, prints the transport address, and suspends the forked test JVM until your jdb or IDE debugger connects.
You can debug a specific test method in a multi-module Maven project by targeting the test class or method when invoking the skill. It runs the specified test in JDWP suspend mode, allowing a debugger to attach to the forked test JVM.
Running Surefire with JDWP suspend mode means the forked test JVM starts but pauses execution immediately, waiting for a debugger to attach to a designated localhost port before proceeding with the test run.
This approach works with both jdb and IDE debuggers. Once Surefire launches in JDWP suspend mode and prints the transport address, you can attach any debugger that supports connecting to a localhost port.
Your Maven test execution hangs because the forked test JVM is suspended in JDWP wait-for-debugger mode. It is waiting for a debugger to attach to the printed localhost port before it proceeds with running the Surefire tests.
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