From johan.ha...@gmail.com on March 15, 2010 13:24:33

I find that I get NullPointerExceptions when invoking toString() on
any mock objects generated by PowerMock. The following simple code
will re-create the problem:

import javax.crypto.Cipher;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

@RunWith(PowerMockRunner.class)
@PrepareForTest(Cipher.class)
public class MyTest {
private Cipher cipher;

@test
public void test1() throws Exception {
cipher = PowerMockito.mock(Cipher.class);

   System.out.println(cipher);

}
}

We use Log4j quite heavily to log method parameters and using injected
PowerMock objects makes this a big issue for us.

Original issue: http://code.google.com/p/powermock/issues/detail?id=239