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POEclipse JUnit 4 gives NullPointerException
 

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    <p>When I try to run a JUnit 4 test i get a NullPointerException in Eclipse. JUnit3 though works. </p> <p>I'm trying the following test class:</p> <pre><code>import static org.junit.Assert.fail; import org.junit.Test; public class Test { @Test public void test() { fail("Not yet implemented"); } } </code></pre> <p>Here is the Exception Stack Trace:</p> <pre><code>java.lang.NullPointerException at org.eclipse.jdt.junit.launcher.JUnitLaunchConfigurationDelegate$ClasspathLocalizer.localURL(JUnitLaunchConfigurationDelegate.java:420) at org.eclipse.jdt.junit.launcher.JUnitLaunchConfigurationDelegate$ClasspathLocalizer.entryString(JUnitLaunchConfigurationDelegate.java:409) at org.eclipse.jdt.junit.launcher.JUnitLaunchConfigurationDelegate$ClasspathLocalizer.addEntry(JUnitLaunchConfigurationDelegate.java:396) at org.eclipse.jdt.junit.launcher.JUnitLaunchConfigurationDelegate$ClasspathLocalizer.localizeClasspath(JUnitLaunchConfigurationDelegate.java:387) at org.eclipse.jdt.junit.launcher.JUnitLaunchConfigurationDelegate.getClasspath(JUnitLaunchConfigurationDelegate.java:364) at org.eclipse.jdt.junit.launcher.JUnitLaunchConfigurationDelegate.launch(JUnitLaunchConfigurationDelegate.java:147) at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:855) at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:704) at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:1047) at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1251) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53) </code></pre> <p>I'm using OS X Snow Leopard with Java SDK 1.6.0_35 (from Apple). Both JDK and JUnit 4 are in my build path. Has the Java Version something to do with the problem ?</p> <p>UPDATE:</p> <p>Ok I'm an idiot not thinking of this. I installed Eclipse for C/C++ Developers as I had to do something in C++. But I also used the same instance to develop for Android with the Android SDK plugin and I did some small Java Applications. But I didn't have the Java Development Tools or the Java EE Developer Tools installed. I installed them now and JUnit 4 works now. </p> <p>I guess one of this Tools is used for JUnit 4. Strange though that JUnit 3 worked. Anyway it works now. </p> <p>Thank you all for your support though.</p>
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    1. COJava has so many problems that a simple version upgrade might solve it. As always, it's recommended to use the latest version (especially since they found some major flaws lately).
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    2. COWhich version of Eclipse are you using?
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    3. COIf you're using 3.6 (Helios) and looking at http://grepcode.com/file/repository.grepcode.com/java/eclipse.org/3.6/org.eclipse.jdt.junit/core/3.6.0/org/eclipse/jdt/junit/launcher/JUnitLaunchConfigurationDelegate.java#JUnitLaunchConfigurationDelegate it seems like you've got a corrupted installation of Eclipse. Try using a fresh installation (of Eclipse).
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