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I've got such a code snippet: @RunWith(PowerMockRunner.class) @PrepareForTest({Thread.class}) public class AllMeasuresDataTest { @Before public void setUp() throws Exception { } @Test public void testGetMeasures() { AllMeasuresData measure = new AllMeasuresData(); assertEquals(measure.getMeasures(), null); HashMap<String, Measure> map = new HashMap<String, Measure>(); measure.setMeasures(map); assertEquals(measure.getMeasures(), map); measure.setMeasures(null); assertEquals(measure.getMeasures(), null); } @Test public void testAllMeasuresData() throws IOException { ClassLoader loader = PowerMockito.mock(ClassLoader.class); Thread threadMock = PowerMockito.mock(Thread.class); Vector<URL> vec = new Vector<URL>(); Mockito.when(loader.getResources("measure")).thenReturn(vec.elements()); Mockito.when(threadMock.getContextClassLoader()).thenReturn(loader); PowerMockito.mockStatic(Thread.class); Mockito.when(Thread.currentThread()).thenReturn(threadMock); ... } } While running this tests I got: java.lang.LinkageError: loader constraint violation: loader (instance of org/powermock/core/classloader/MockClassLoader) previously initiated loading for a different type with name "javax/management/MBeanServer" at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:791) at java.lang.ClassLoader.defineClass(ClassLoader.java:634) at org.powermock.core.classloader.MockClassLoader.loadUnmockedClass(MockClassLoader.java:201) at org.powermock.core.classloader.MockClassLoader.loadModifiedClass(MockClassLoader.java:149) at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass(DeferSupportingClassLoader.java:67) at java.lang.ClassLoader.loadClass(ClassLoader.java:356) at org.codecover.instrumentation.java.measurement.ProtocolImpl.initializeMBean(ProtocolImpl.java:247) at org.codec

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