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
System.out.println("keepalive "+fKeepAlive); 
	}
	private void readTestNames(String testNameFile) throws IOException {
		BufferedReader br= new BufferedReader(new FileReader(new File(testNameFile)));
		try {
			String line;
			Vector list= new Vector();
			while ((line= br.readLine()) != null) {
				list.add(line);
			}
			fTestClassNames= (String[]) list.toArray(new String[list.size()]);
		}
		finally {
			br.close();
		}
		if (fDebugMode) {
			System.out.println("Tests:"); 
			for (int i= 0; i < fTestClassNames.length; i++) {
				System.out.println("    "+fTestClassNames[i]); 
			}
		}
	}
	
	/**
	 * Connects to the remote ports and runs the tests.
	 */
	protected void run() {
		if (!connect())
			return;
		if (fRerunTest != null) {