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
* -test: the test method name (format classname testname) 
	 * -host: the host to connect to default local host 
	 * -port: the port to connect to, mandatory argument 
	 * -keepalive: keep the process alive after a test run
     * </pre>
     */
	public static void main(String[] args) {
		RemoteTestRunner testRunServer= new RemoteTestRunner();
		testRunServer.init(args);
		testRunServer.run();
		
		System.exit(0);
	}
	
	/**
	 * Parse command line arguments. Hook for subclasses to process
	 * additional arguments.
	 */
	protected void init(String[] args) {
		defaultInit(args);		
	}	
	
	/**
	 * The class loader to be used for loading tests.
	 * Subclasses may override to use another class loader.
	 */
	protected ClassLoader getClassLoader() {
		return getClass().getClassLoader();
	}