java.lang.IllegalArgumentException: replica.java.lang.System$$PowerMock0 is not an interface

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java.lang.IllegalArgumentException: replica.java.lang.System$$PowerMock0 is not an interface	at java.lang.reflect.Proxy.getProxyClass(Proxy.java:362)	at java.lang.reflect.Proxy.newProxyInstance(Proxy.java:581)	at org.easymock.internal.JavaProxyFactory.createProxy(JavaProxyFactory.java:12)	at org.easymock.internal.MocksControl.createMock(MocksControl.java:37)	at org.powermock.api.easymock.PowerMock.doCreateMock(PowerMock.java:2212)	at org.powermock.api.easymock.PowerMock.doMock(PowerMock.java:2134)	at org.powermock.api.easymock.PowerMock.mockStatic(PowerMock.java:287)