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jmockit / jmockit1

Advanced Java library for integration testing, mocking, faking, and code coverage
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java.lang.NullPointerException exception since with jmockit 1.10 onwards #162

Closed PrzemekCh closed 9 years ago

PrzemekCh commented 9 years ago

While trying to generate a mockup for oracle.wsm.policy.model.impl.SimpleAssertion

SimpleAssertion simpleAsserter = new MockUp() {

}.getMockInstance();

if fails with jmockup since version 1.10+. In previous versions it works.

java.lang.NullPointerException at java.util.HashMap.(HashMap.java:223) at oracle.wsm.policy.model.impl.SimpleAssertion.hashCode(SimpleAssertion.java:777) at java.util.HashMap.getEntry(HashMap.java:344) at java.util.HashMap.containsKey(HashMap.java:335) at java.util.HashSet.contains(HashSet.java:184) at java.util.AbstractCollection.retainAll(AbstractCollection.java:369) at mockit.internal.state.MockClasses$SavePoint.rollback(MockClasses.java:165) at mockit.internal.state.SavePoint.rollback(SavePoint.java:42) at mockit.integration.internal.TestRunnerDecorator.discardTestLevelMockedTypes(TestRunnerDecorator.java:123) at mockit.integration.internal.TestRunnerDecorator.cleanUpMocks(TestRunnerDecorator.java:85) at mockit.integration.internal.TestRunnerDecorator.cleanUpMocksFromPreviousTestClass(TestRunnerDecorator.java:80) at mockit.integration.junit4.internal.RunNotifierDecorator.fireTestRunFinished(RunNotifierDecorator.java:28) at org.junit.runner.notification.RunNotifier.fireTestRunFinished(RunNotifier.java) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:51) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

rliesenfeld commented 9 years ago

Is this class "oracle.wsm.policy.model.impl.SimpleAssertion" available from some artifact in the Maven Central repository? If not (and apparently it isn't), I won't be able to examine the problem.

PrzemekCh commented 9 years ago

I've send You the jar over email.

PrzemekCh commented 9 years ago

And in previous versions it will not throw an error but the instance created is always null.

rliesenfeld commented 9 years ago

Thanks, reproduced it now. As a workaround, consider not calling "getMockInstance()". When mocking-up a class, this method is not meant to be used in the vast majority of cases, as it creates an uninitialized instance for a partially mocked class; so, if you use it there is a good chance of later getting a NPE or some other exception due to executing unmocked methods on an uninitialized instance.