8280131: jcmd reports "Module jdk.jfr not found." when "jdk.management.jfr" is missing

[egahlin]

Could I have a review of a PR that ensures JFR can be used when only the jdk.jfr module is present in an image.

The behavior is similar to how -javaagent adds the java.instrument module and "jcmd PID ManagementAgent.status" loads the jdk.management.agent module.

TestJfrJavaBase.java is replaced with TestModularImage.java. The former test could not be used since the jdk.jfr module is now added to the module graph when -XX:StartFlightRecording is specified.

Testing: tier1-3 + test/jdk/jdk/jfr

Thanks
Erik

---

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Issue

• JDK-8280131: jcmd reports "Module jdk.jfr not found." when "jdk.management.jfr" is missing

Reviewers

• Markus Grönlund (@mgronlun - Reviewer) ⚠️ Review applies to e5035b14
• Alan Bateman (@AlanBateman - Reviewer) ⚠️ Review applies to e5035b14

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Webrevs

• 01: Full - Incremental (7b41be0f)
• 00: Full (e5035b14)

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8280131: jcmd reports "Module jdk.jfr not found." when "jdk.management.jfr" is missing

Reviewed-by: mgronlun, alanb

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[AlanBateman]

The changes look okay to me except that "invalid_state" isn't a clear name for function that tries to ensure that the jdk.jfr module is loaded. Up to you, but I think it would be clear if it were renamed load_jfr that returns disabled when disabled or the jdk.jfr module cannot be loaded.

[egahlin]

I agree. I have a large refactoring of jfrDcmd.cpp coming up. I will clean up names and logic in that PR.

[egahlin]

/integrate

[openjdk]

Going to push as commit a345df2.
Since your change was applied there have been 13 commits pushed to the master branch:

• ef62b61: 8295703: RISC-V: Remove implicit noreg temp register arguments in MacroAssembler
• 6240431: 8295697: Resolve conflicts between serviceability/jvmti and nsk/jvmti shared code
• 1164258: 8295124: Atomic::add to pointer type may return wrong value
• d3eba85: 8295414: [Aarch64] C2: assert(false) failed: bad AD file
• 028e8b3: 8137022: Concurrent refinement thread adjustment and (de-)activation suboptimal
• faa6b66: 8295715: Minimize disabled warnings in serviceability libs
• de1e0c5: 8295719: Remove unneeded disabled warnings in jdk.sctp
• 9612cf9: 8295529: Add link to JBS to README.md
• b37421e: 8295564: Norwegian Nynorsk Locale is missing formatting
• 6707bfb: 8029633: Raw inner class constructor ref should not perform diamond inference
• ... and 3 more: https://git.openjdk.org/jdk/compare/78dc4977863a92f990b355f6b4d2609a674ab19b...master

Your commit was automatically rebased without conflicts.

[openjdk]

@egahlin Pushed as commit a345df2.

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