Stage does not support lambda expression

[riadmaouchi]

I have implemented a simple step with lambda-expression inside:

public class WhenStage<SELF extends WhenStage<SELF>> extends Stage<SELF> {
  public SELF test() {
        doAnswer(invocationOnMock -> null).when(mockedObject).myMethod();
        return self();
  }

When I launch the test, the following exception occurs:

[Stack Trace]

java.lang.ArrayIndexOutOfBoundsException: 19562
at com.thoughtworks.paranamer.BytecodeReadingParanamer$ClassReader.accept(BytecodeReadingParanamer.java:563)
at com.thoughtworks.paranamer.BytecodeReadingParanamer$ClassReader.access$200(BytecodeReadingParanamer.java:338)
at com.thoughtworks.paranamer.BytecodeReadingParanamer.lookupParameterNames(BytecodeReadingParanamer.java:103)
at com.thoughtworks.paranamer.BytecodeReadingParanamer.lookupParameterNames(BytecodeReadingParanamer.java:69)
at com.tngtech.jgiven.impl.util.ScenarioUtil.getParameterNames(ScenarioUtil.java:51)
at com.tngtech.jgiven.impl.util.ScenarioUtil.mapArgumentsWithParameterNames(ScenarioUtil.java:32)
at com.tngtech.jgiven.impl.ScenarioExecutor$MethodHandler.handleMethod(ScenarioExecutor.java:131)
at com.tngtech.jgiven.impl.intercept.StepMethodInterceptor.intercept(StepMethodInterceptor.java:44)
at


But if I replace lambda expression with anonymous class, all works fine.

[janschaefer]

Interesting. This is indeed a severe problem. It seems that the paranamer library does not work with Java 8.

[janschaefer]

Ok. I have fixed the issue. However, it has a little drawback. In order to work for Java 8 correctly, you have to compile your test classes with the -parameters option of javac.

[janschaefer]

Thanks for reporting, btw :-)