Bug 62503 Classloader problem with older versions of JUnit [JUnit]
I have a project with a version 3.6 junit.jar on the classpath. In 3.0M8 when I run a test with an assertEquals() that fails, I get this error: java.lang.NoClassDefFoundError: junit/framework/ComparisonFailure at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.addFailure(RemoteTestRunner.java:533) 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:131) at junit.framework.TestSuite.runTest(TestSuite.java:173) at junit.framework.TestSuite.run(TestSuite.java:168) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:410) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:294) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:182) Exception in thread "main" This used to work with Eclipse 2.1 (which also had JUnit 3.8.1 built in), and it disappears when I upgrade my copy of junit.jar to 3.8.1 to match the Eclipse one.
org.eclipse.jdt.junit.runtime/src/org/eclipse/jdt/internal/junit/runner/RemoteTestRunner.java
notifyTestFailed2(test, MessageIds.TEST_FAILED, getTrace(assertionFailedError), expected, actual);
		            return;
		       }
		    }
		} 
		notifyTestFailed(test, MessageIds.TEST_FAILED, getTrace(assertionFailedError));
	}
	/*
	 * @see TestListener#endTest(Test)
	 */
	public void endTest(Test test) {
		notifyTestEnded(test);
	}
	/*
	 * @see TestListener#startTest(Test)
	 */
	public void startTest(Test test) {
		notifyTestStarted(test);
	}
	
	private void sendTree(Test test){
		if(test instanceof TestDecorator){
			TestDecorator decorator= (TestDecorator) test;
			sendTree(decorator.getTest());		
		}
		else if(test instanceof TestSuite){
			TestSuite suite= (TestSuite) test;
			notifyTestTreeEntry(getTestId(test)+','+escapeComma(suite.toString().trim()) + ',' + true + ',' + suite.testCount());
			for(int i=0; i < suite.testCount(); i++){	
				sendTree(suite.testAt(i));