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PowerMock: java.lang.IllegalAccessError: java.lang.Class with mocking java.util.ServiceLoader

I am trying to make fun of java ServicesLoader(which is final) in my tests with PowerMock and it doesn't seem to work ...

The simplest test case that reproduces the error is:

import java.util.ServiceLoader;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.easymock.PowerMock;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

@RunWith(PowerMockRunner.class)
@PrepareForTest(ServiceLoader.class)
public class ServiceLoaderTest {
    @Test
    public void testServiceLoaderMock() {
        ServiceLoader mock = PowerMock.createMock(ServiceLoader.class);
    }
}

And I get the following:

-------------------------------------------------------------------------------
Test set: ServiceLoaderTest
-------------------------------------------------------------------------------
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.407 sec <<< FAILURE!
testServiceLoaderMock(ServiceLoaderTest)  Time elapsed: 0.359 sec  <<< ERROR!
java.lang.IllegalAccessError: java.lang.Class
        at sun.reflect.GeneratedSerializationConstructorAccessor8.newInstance(Unknown Source)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at org.objenesis.instantiator.sun.SunReflectionFactoryInstantiator.newInstance(SunReflectionFactoryInstantiator.java:56)
        at org.powermock.reflect.internal.WhiteboxImpl.newInstance(WhiteboxImpl.java:257)
        at org.powermock.reflect.Whitebox.newInstance(Whitebox.java:139)
        at org.powermock.core.DefaultFieldValueGenerator.instantiateFieldType(DefaultFieldValueGenerator.java:74)
        at org.powermock.core.DefaultFieldValueGenerator.fillWithDefaultValues(DefaultFieldValueGenerator.java:51)
        at org.powermock.api.easymock.PowerMock.doMock(PowerMock.java:2146)
        at org.powermock.api.easymock.PowerMock.createMock(PowerMock.java:98)
        at ServiceLoaderTest.testServiceLoaderMock(ServiceLoaderTest.java:12)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:66)
        at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:322)
        at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:86)
        at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:94)
        at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:309)
        at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:112)
        at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:73)
        at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:297)
        at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:84)
        at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:49)
        at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:222)
        at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:161)
        at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:135)
        at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:34)
        at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:44)
        at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:133)
        at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:112)
        at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:57)
        at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:62)
        at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:140)
        at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:127)
        at org.apache.maven.surefire.Surefire.run(Surefire.java:177)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:345)
        at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1009)

I assume this has something to do with initializing the Class<T>service field , but I don't know for sure.

Once I fixed this, I would also like to make fun of the static method ServiceLoader.load(Class)in order to return the previously created layout, so more problems may arise ...

Any idea on how to solve it?

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? , PowerMock , ? PowerMock , , . . . , mock . MockGateway , , , . , , java.lang.System java.lang.String, . Java. , , , :

 public class SystemPropertyMockDemo {

    public String getSystemProperty() throws IOException {
        return System.getProperty("property");
    }
}

@RunWith(PowerMockRunner.class)
@PrepareForTest( { SystemPropertyMockDemo.class, SystemPropertyMockDemoTest.class })
public class SystemPropertyMockDemoTest

    @Test
    public void demoOfFinalSystemClassMocking() throws Exception {
        mockStatic(System.class);

        expect(System.getProperty("property")).andReturn("my property");

        replayAll();

        assertEquals("my property",
                                  new SystemPropertyMockDemo().getSystemProperty());

        verifyAll();
    }
}
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