JUnit java.lang.NoSuchMethodError: junit.framework.ComparisonFailure.getExpected()Ljava/lang/String
java, junit, unit-testing
Solution
The `getExpected()` method on `junit.framework.ComparisonFailure` was only added in JUnit 3.8.2 (remember, `junit.framework` package is from JUnit 3.8, whereas JUnit 4 uses `org.junit`). The method wasn't there in 3.8.1, which is the most common version of 3.x still out there.
I think the method was added for easier migration to JUnit 4 tooling, and occasionally this exception pops up on older code bases that use JUnit 3.8. The Eclipse JUnit 4 test runner would appear to switch back to calling the `junit.framework.*` code when running JUnit 3.8 tests.
SO I'm guessing you still have JUnit 3.8.1 lurking about on your classpath, and it's clashing with the Eclipse test runner. Either get rid of that JAR, or "upgrade" it to 3.8.2.
Problem
I am getting the following exception from a test case that ran successfully before but now it throws this exception: ``` java.lang.NoSuchMethodError: junit.framework.ComparisonFailure.getExpected()Ljava/lang/String; at org.eclipse.jdt.internal.junit4.runner.JUnit4TestListener.testFailure(JUnit4TestListener.java:63) at org.junit.runner.notification.RunNotifier$4.notifyListener(RunNotifier.java:100) at org.junit.runner.notification.RunNotifier$SafeNotifier.run(RunNotifier.java:41) at org.junit.runner.notification.RunNotifier.fireTestFailure(RunNotifier.java:97) at org.junit.internal.runners.JUnit38ClassRunner$OldTestClassAdaptingListener.addError(JUnit38ClassRunner.java:41) at org.junit.internal.runners.JUnit38ClassRunner$OldTestClassAdaptingListener.addFailure(JUnit38ClassRunner.java:64) at junit.framework.TestResult.addFailure(TestResult.java:46) at junit.framework.TestResult.runProtected(TestResult.java:127) at junit.framework.TestResult.run(TestResult.java:109) at junit.framework.TestCase.run(TestCase.java:118) at junit.framework.TestSuite.runTest(TestSuite.java:208) at junit.framework.TestSuite.run(TestSuite.java:203) at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) ``` Anyone know what is causing this? It seems like an internal issue with the JUnit runner.