Description Jan Hoppe 2007-06-04 04:31:15 EDT

Since 3.3M6 the following implementation fails with an AbstractMethodError 

interface IBase 
{
	IBaseReturn get();
}

interface IEnhanced extends IBase 
{
	IEnhancedReturn get();
}

abstract class AImpl 
{

	public IEnhancedReturn get() 
	{
		return null;
	}
}

class Impl extends AImpl implements IBase, IEnhanced 
{
}

class ImplTest extends TestCase 
{
	public void testGet() throws Exception 
	{
		IBase base = new Impl();
		IBaseReturn baseReturn = base.get();
		if (baseReturn != null) 
		{
			System.out.println(baseReturn);
		}
	}
}

Test fails:

java.lang.AbstractMethodError: Impl.get()LIBaseReturn;
	at ImplTest.testGet(ImplTest.java:9)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at junit.framework.TestCase.runTest(TestCase.java:164)
	at junit.framework.TestCase.runBare(TestCase.java:130)
	at junit.framework.TestResult$1.protect(TestResult.java:106)
	at junit.framework.TestResult.runProtected(TestResult.java:124)
	at junit.framework.TestResult.run(TestResult.java:109)
	at junit.framework.TestCase.run(TestCase.java:120)
	at junit.framework.TestSuite.runTest(TestSuite.java:230)
	at junit.framework.TestSuite.run(TestSuite.java:225)
	at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)


It works on 3.2.x and until 3.3M5 but never again since M6!