Problem
JUnit test cases cannot be run in Eclipse IDE with below errors
!ENTRY org.eclipse.core.jobs 4 2 2017-07-05 12:05:37.873
!MESSAGE An internal error occurred during: "Launching ClarityUtilTest (1)".
!STACK 0
java.lang.NullPointerException
at java.util.zip.ZipFile.getZipEntry(Unknown Source)
at java.util.zip.ZipFile.access$900(Unknown Source)
at java.util.zip.ZipFile$ZipEntryIterator.next(Unknown Source)
at java.util.zip.ZipFile$ZipEntryIterator.nextElement(Unknown Source)
at java.util.zip.ZipFile$ZipEntryIterator.nextElement(Unknown Source)
at org.eclipse.m2e.jdt.internal.BuildPathManager.getJavaDocPathInArchive(BuildPathManager.java:696)
at org.eclipse.m2e.jdt.internal.BuildPathManager.getJavaDocUrl(BuildPathManager.java:681)
at org.eclipse.m2e.jdt.internal.BuildPathManager.getJavaDocUrl(BuildPathManager.java:674)
at org.eclipse.m2e.jdt.internal.BuildPathManager.configureAttachedSourcesAndJavadoc(BuildPathManager.java:309)
at org.eclipse.m2e.jdt.internal.BuildPathManager.getClasspath(BuildPathManager.java:258)
at org.eclipse.m2e.jdt.internal.BuildPathManager.getClasspath(BuildPathManager.java:367)
at org.eclipse.m2e.jdt.internal.launch.MavenRuntimeClasspathProvider.addMavenClasspathEntries(MavenRuntimeClasspathProvider.java:155)
at org.eclipse.m2e.jdt.internal.launch.MavenRuntimeClasspathProvider.resolveClasspath0(MavenRuntimeClasspathProvider.java:126)
at org.eclipse.m2e.jdt.internal.launch.MavenRuntimeClasspathProvider$1.call(MavenRuntimeClasspathProvider.java:114)
at org.eclipse.m2e.jdt.internal.launch.MavenRuntimeClasspathProvider$1.call(MavenRuntimeClasspathProvider.java:1)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:177)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:151)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:99)
at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:1355)
at org.eclipse.m2e.jdt.internal.launch.MavenRuntimeClasspathProvider.resolveClasspath(MavenRuntimeClasspathProvider.java:111)
at org.eclipse.jdt.internal.launching.RuntimeClasspathProvider.resolveClasspath(RuntimeClasspathProvider.java:65)
at org.eclipse.jdt.launching.JavaRuntime.resolveRuntimeClasspath(JavaRuntime.java:1260)
at org.eclipse.jdt.launching.AbstractJavaLaunchConfigurationDelegate.getClasspath(AbstractJavaLaunchConfigurationDelegate.java:412)
at org.eclipse.jdt.junit.launcher.JUnitLaunchConfigurationDelegate.getClasspath(JUnitLaunchConfigurationDelegate.java:366)
at org.eclipse.jdt.junit.launcher.JUnitLaunchConfigurationDelegate.launch(JUnitLaunchConfigurationDelegate.java:147)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:885)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:739)
at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:1039)
at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1256)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:56)
Cause
The project is bundled with Maven and using the libraries downloaded by Maven. When running JUnit, it try to locate the javadoc. Somehow the javadoc is not accessible or cannot be found. In Eclipse Java Project, the reference can be found in .classpath file
<classpathentry kind="var" path="M2_REPO/junit/junit/4.12/junit-4.12.jar" sourcepath="M2_REPO/junit/junit/4.12/junit-4.12-sources.jar">
<attributes>
<attribute value="jar:file:/C:/Users/bzhan08/.m2/repository/junit/junit/4.12/junit-4.12-javadoc.jar!/" name="javadoc_location"/>
</attributes>
</classpathentry>
Solution
Remove the lines of javadoc from .classpath