Facing problem in Junit4 and spring 2.5 configuration

Hi,

I have configured the junit4 with spring 2.5 and hibrenate3 for unit testing, I am facing following problem, any one can guide me why this is happening, I am new in junit4..

java.lang.SecurityException: class "org.junit.internal.runners.JUnit4ClassRunner"'s signer information does not match signer information of other classes in the same package
	at java.lang.ClassLoader.checkCerts(Unknown Source)
	at java.lang.ClassLoader.preDefineClass(Unknown Source)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.access$100(Unknown Source)
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClassInternal(Unknown Source)
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.access$100(Unknown Source)
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClassInternal(Unknown Source)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Unknown Source)
	at sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(Unknown Source)
	at sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Unknown Source)
	at sun.reflect.generics.tree.ClassTypeSignature.accept(Unknown Source)
	at sun.reflect.annotation.AnnotationParser.parseSig(Unknown Source)
	at sun.reflect.annotation.AnnotationParser.parseClassValue(Unknown Source)
	at sun.reflect.annotation.AnnotationParser.parseMemberValue(Unknown Source)
	at sun.reflect.annotation.AnnotationParser.parseAnnotation(Unknown Source)
	at sun.reflect.annotation.AnnotationParser.parseAnnotations2(Unknown Source)
	at sun.reflect.annotation.AnnotationParser.parseAnnotations(Unknown Source)
	at java.lang.Class.initAnnotationsIfNecessary(Unknown Source)
	at java.lang.Class.getAnnotation(Unknown Source)
	at org.junit.internal.requests.ClassRequest.getRunnerClass(ClassRequest.java:45)
	at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:28)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.<init>(JUnit4TestReference.java:26)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestClassReference.<init>(JUnit4TestClassReference.java:24)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:40)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:30)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:445)
	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)

sample code for junit4 is as below

**
 * @author user
 *
 */
@RunWith(SpringJUnit4ClassRunner.class)
//@TransactionConfiguration(defaultRollback = true)
//@Transactional(readOnly = true, propagation = Propagation.REQUIRED)
@ContextConfiguration(locations={"/test/applicationTestContext.xml","/test/applicationTestContext-additional.xml"})
public class CampaignServiceTest extends TestCase {//extends BaseTest{//extends AbstractDependencyInjectionSpringContextTests { //extends AbstractAnnotationAwareTransactionalTests{

@Autowired
	protected CampaignService campaignService;
	
	/**
	 * Test method for {@link com.mediamath.ignition.campaign.svc.CampaignService#getCampaignById(java.lang.Integer)}.
	 */
	//@Test
	//@Transactional(propagation=Propagation.REQUIRED)
	public final void testGetCampaignById() {
		//fail("Not yet implemented"); // TODO
		try {
		/*	ApplicationContext appContext = SpringContextLoader.getInstance();  
			Object o = appContext.getBean("campaignService");  
			vsedao = (CampaignService)o; */
		System.out.println("hi");
		Assert.assertNotNull(this.campaignService);
		System.out.println("Hi 1");
		Campaign campaign = this.campaignService.getCampaignById(1);
		System.out.println(" Name : " + campaign.getName());
		System.out.println(" Id :  " + campaign.getId());
		//assertTrue(1 == campaign.getId());
		assertTrue(true);
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}

Thanks....
rk

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