NoClassDefFoundError

[Marcus Klaus]

Hello,
I am a Java Newbie and working on a Java project with silk4J. I am getting NoClassDefFoundError in one of my unit tests. I am unable to understand this error. The test runs without any failures but gives out error.

NoClassDefFoundError : If the compiler doesnt find the class then we get the NoClassDefFoundError...Am I right?

Can someone help me understand and correct the error in my unit test? I am attaching the two java files that i am working with and also the surefire log report. I am unable to find the solution.
I would appreciate the help. Thanks

public class Systemparameter_WFTest extends AbstractKTSTest {

	@Test
	public void systemparameter_expandCollapseTest() throws RequiredParameterNotSetException {
		BasicPage basicPage = new BasicPage();
		basicPage.menuePunkt("Systemparameter");
		
		Sysparam_krit_WD sysparamkritwd_page = new Sysparam_krit_WD();
		sysparamkritwd_page.ok().click();
		
		Sysparam_liste_WLD sysparamlistewld_page = new Sysparam_liste_WLD();
		sysparamlistewld_page.range_LB().expand(TestContext.get("c2.systemparameter.FahrzeugFinanzart"));
		sysparamlistewld_page.range_LB().doubleSelect(TestContext.get("c2.systemparameter.FahrzeugFinanzart"));
	}
	
	@Test
	public void systemparameter_setAndResetParameterTest()
		throws RequiredParameterNotSetException, NoItemsFoundException, RequiredParameterNotValidException {
		Systemparameter_WF systemparameter_WF = new Systemparameter_WF();
		systemparameter_WF.setSystemParameterName(
			TestContext.get("c2.systemparameter.FahrzeugAuswertungenBrieffileLogfile")).
			setSystemParameterValue("UNIT-TEST-VALUE").modifyParameterIfNecessary();
	}
}

The log generated by surefire is as follows. :

Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0 sec <<< FAILURE!
at.xxx.uitests.inif.Systemparameter_WFTest Time elapsed: 3.625 sec <<< ERROR!
java.lang.NoClassDefFoundError: Could not initialize class at.xxx.silk.AbstractKTSTest
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:53)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:123)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:104)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:164)
at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:110)
at org.apache.maven.surefire.booter.SurefireStarter.invokeProvider(SurefireStarter.java:175)
at org.apache.maven.surefire.booter.SurefireStarter.runSuitesInProcessWhenForked(SurefireStarter.java:107)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:68)

public abstract class AbstractKTSTest {
	
	public static BaseState baseState;
	public static Desktop desktop = new Desktop();
		  
	
	@BeforeClass
	public static void beforeClass() throws Exception {
		dump();	
		
		/*
		 * Cross2 process does not exist, so we have to select the dealer. 
		 */		
		if(!KTS.isCross2ProcessRunning()){
			//execute base state for dealer 
			Window c2StartWindow = KTS.executeDealerState();
	
			//enter dealer number
			c2StartWindow.<TextField>find("//TextField[@automationId='txtHdlNr']").setText(Settings.get("c2.login.dealerNumber"));			
			c2StartWindow.pressKeys("<Ctrl>", true);
			c2StartWindow.typeKeys("a");
			c2StartWindow.releaseKeys("<Ctrl>", true);				
			
			String localeString = I18n.getLocaleStr().toString();
			c2StartWindow.<ComboBox>find("//ComboBox[@automationId='cbLang']").select(localeString);
			c2StartWindow.<PushButton>find("//PushButton[@automationId='btnStart']").click();
	
			//wait for Cross2
			KTS.waitForCross2BaseState();			
		}
		
		/*
		 * Cross2 process exists but maybe we have to login first.
		 */
		if(KTS.isCross2ProcessRunning()){
			//execute base state for Cross2
			KTS.executeCross2State();
			
			//check if plain Cross2 window exists or if we have to login first
			String anmeldungLocator = "//Dialog[@caption='" + I18n.getText("Anmeldung").get(0) + "']";
			 //TODO: handle multiple translations?
			if(desktop.exists(anmeldungLocator)){
				Login_WD login = new Login_WD("Anmeldung");
				login.benutzer_SE().setText(Settings.get("c2.login.userName"), false);
				login.passwort_SE().setText(Settings.get("c2.login.password"), false);
				login.ok().click();				
			}
			else{
				//do nothing: Cross 2 main window exists and there is no login window -> :)
			}
		}else{
			throw new Exception("Cross2 process does not exist.");
		}		
	}

	private static boolean dumped = false;
	/**
	 * Dumps system properties and test settings on System.out.
	 */
	private static void dump() {
		if(!dumped){
			System.out.println("\n");
			System.out.println("---[ System properties ]--------------------------------------------------------------");
			Settings.dumpSystemProperties(System.out);
			System.out.println("--------------------------------------------------------------------------------------");
			System.out.println("\n");
						
			System.out.println("---[ Test settings ]------------------------------------------------------------------");
			Settings.dump(System.out);
			System.out.println("--------------------------------------------------------------------------------------");
			
			dumped = true;			
		}
	}


	@Before
	public void before() {
		Window mainWindow = Cross2Fenster.getMainWindow();
		WindowManager.closeChilds(mainWindow);
		Cross2Fenster.getMainWindow().setActive();	
		AdobeReader.killAllProcesses();
	}	
	
	@After
	public void after(){
		//closeChilds();
	}	
}

[Ulf Dittmer]

NoClassDefFoundError : If the compiler doesnt find the class then we get the NoClassDefFoundError...Am I right?

Not quite - that is a runtime error, not a compile time error. So its not the compiler that doesn't find the class, it's the runtime environment.

The first question would be: is that class file where it should be? Meaning, in whatever classpath is used for running the test, and in the correct directory, depending on its package?