java.lang.NoSuchFieldException error from jacoco

Question

I am trying to run the tests of the kotlin code provided from here : https://github.com/ligi/ipfs-api-kotlin with gradlew

I got the error listed below. Could someone tell me what this error means ?

> Task :test FAILED
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)
FATAL ERROR in native method: processing of -javaagent failed, processJavaStart failed
        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

Answer 1

I was missing the following from my build.gradle:

jacoco {
    toolVersion = "0.8.6"
}

While obvious, build.gradle can inherit properties from other gradle files and for reasons I can't figure out, jacoco was passing through in to one subproject but not to another.