PowerMock - Cannot cast class org.powermock.api.mockito.internal.mockmaker.PowerMockMaker to interface org.mockito.plugins.MockMaker

Question

I am getting an java.lang.ExceptionInInitializerError when using TestNg + PowerMock + Mockito:

Caused by: java.lang.NullPointerException
at org.mockito.internal.configuration.plugins.Plugins.getStackTraceCleanerProvider(Plugins.java:17)

The root of the problem is:

java.lang.ClassCastException: Cannot cast class org.powermock.api.mockito.internal.mockmaker.PowerMockMaker to interface org.mockito.plugins.MockMaker

My dependency tree:

[INFO] +- org.powermock:powermock-api-mockito:jar:1.6.2:test
[INFO] |  +- org.mockito:mockito-all:jar:1.10.19:test
[INFO] |  \- org.powermock:powermock-api-support:jar:1.6.2:test
[INFO] |     \- org.powermock:powermock-reflect:jar:1.6.2:test
[INFO] |        \- org.objenesis:objenesis:jar:2.1:test
[INFO] +- org.powermock:powermock-module-testng:jar:1.6.2:test
[INFO] |  +- org.powermock:powermock-core:jar:1.6.2:test
[INFO] |  |  \- org.javassist:javassist:jar:3.19.0-GA:test
[INFO] |  \- org.powermock:powermock-module-testng-common:jar:1.6.2:test

Test class:

@PrepareForTest({CrossSiteServletRequestFilter.class})
@PowerMockIgnore({"org.apache.log4j.*"})
@Test
public class CrossSiteServletRequestFilterTest extends PowerMockTestCase{
    @Mock
    private HttpServletRequest request;

    @BeforeSuite
    public void beforeSuite() {
        URL log4jCfg = CrossSiteServletRequestFilterTest.class.getClassLoader().getResource("log/log4j.xml");
        DOMConfigurator.configure(log4jCfg);
        MockitoAnnotations.initMocks(this); //<---It crashes here

I am completely lost with this error and appreciate any help.

Answer 1

You are not supposed to use MockitoAnnotations.initMocks with TestNG.

The Javadoc is saying to use it for JUnit (and I think MockitoJUnitRunner / MockitoRule is a better way) but not for TestNG.

BTW, PowerMockTestCase is the equivalent of MockitoJUnitRunner when you use TestNG. So, just remove the line and it should work.