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Asked: 2026-05-10T18:52:54+00:00

I’m trying to generate code coverage reports with EMMA using tests of which some

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I’m trying to generate code coverage reports with EMMA using tests of which some use JMockit as a mocking framework. For the most part, it works, but a few of my tests crash with a ClassFormatError, like so:

java.lang.ClassFormatError     at sun.instrument.InstrumentationImpl.redefineClasses0(Native Method)     at sun.instrument.InstrumentationImpl.redefineClasses(InstrumentationImpl.java:79)     at mockit.internal.RedefinitionEngine.redefineMethods(RedefinitionEngine.java:138)     at mockit.internal.RedefinitionEngine.redefineMethods(RedefinitionEngine.java:73)     at mockit.Mockit.setUpMocks(Mockit.java:177)     at test.my.UnitTest.setUpBeforeClass(UnitTest.java:21)

Any idea what is going on, and whether I can fix the problem? Or are EMMA and JMockit mutually exclusive?

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1 Answer

  1. Seems to be a bug in JMockit: After the class was already instrumented by EMMA, JMockit seems to have issues creating ‘reentry=true’ mock methods.

    Removing the ‘reentry=true’ ‘worked around’ the issue.

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