Hacktoberfest 2026: the issues maintainers tagged for October, open and beginner-friendly. Browse Hacktoberfest issues

Build fails with JaCoCo

Open
#15 0 comments 1 reaction 0 assignees View on GitHub

Nobody has claimed this yet.

Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
45/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
java

Research direction

Start by running mvn package on Windows 10 and inspect the Maven build configuration for the JaCoCo 0.8.1 declaration. Update it to 0.8.5, then rerun mvn package; done means the build completes without the JaCoCo instrumentation failure.

Written by the indexing model from the issue text.

Description

Windows 10 OOB execution of mvn package on master results in

Exception in thread "main" java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at java.instrument/sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:513)
at java.instrument/sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:525)
Caused by: java.lang.RuntimeException: Class java/lang/UnknownError could not be instrumented.
at org.jacoco.agent.rt.internal_c13123e.core.runtime.ModifiedSystemClassRuntime.createFor(ModifiedSystemClassRuntime.java:140)
at org.jacoco.agent.rt.internal_c13123e.core.runtime.ModifiedSystemClassRuntime.createFor(ModifiedSystemClassRuntime.java:101)
at org.jacoco.agent.rt.internal_c13123e.PreMain.createRuntime(PreMain.java:55)
at org.jacoco.agent.rt.internal_c13123e.PreMain.premain(PreMain.java:47)
... 6 more
Caused by: java.lang.NoSuchFieldException: $jacocoAccess
at java.base/java.lang.Class.getField(Class.java:1999)
at org.jacoco.agent.rt.internal_c13123e.core.runtime.ModifiedSystemClassRuntime.createFor(ModifiedSystemClassRuntime.java:138)
... 9 more
*** java.lang.instrument ASSERTION FAILED ***: "result" with message agent load/premain call failed at line: 422
FATAL ERROR in native method: processing of -javaagent failed, processJavaStart failed

Update from 0.8.1 to latest 0.8.5 fixes the issue.

Dominant language
Java
Stars
437
Forks
151
PR merge metrics
No merged PRs in 30d

Getting set up

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

More from aws-samples/aws-sam-java-rest

All issues in aws-samples/aws-sam-java-rest

Similar issues

More Java issues

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.