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I have a bigger ME project (with 2430 Java files) which compiles well with NetBeans 8.0.2 and 8.1, but fails to run with NetBeans 8.2. Here is the output with "--debug" added to Maven and Ant set to "Debug" level too: Location: D:\mod\trunk\me-projects\Ocu2MindroidMeIntegration\nbproject\build-impl.xml:463: -do-jar-copyliblets: Setting project property: build.classes.dir.resolved -> D:\mod\trunk\me-projects\Ocu2MindroidMeIntegration\build\classes Set property run.classpath.without.build.classes.dir = D:\mod\trunk\me-projects\MindroidMIDlet\dist\MindroidMIDlet.jar; Setting project property: run.classpath.without.build.classes.dir -> D:\mod\trunk\me-projects\MindroidMIDlet\dist\MindroidMIDlet.jar; Class java.util.ArrayList loaded from parent loader (parentFirst) Class java.lang.Boolean loaded from parent loader (parentFirst) D:\mod\trunk\me-projects\Ocu2MindroidMeIntegration\nbproject\build-impl.xml:478: java.lang.NullPointerException at org.netbeans.modules.j2me.common.ant.CopyLibletsTask.execute(CopyLibletsTask.java:93) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293) at sun.reflect.GeneratedMethodAccessor318.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) at org.apache.tools.ant.Task.perform(Task.java:348) at org.apache.tools.ant.Target.execute(Target.java:435) at org.apache.tools.ant.Target.performTasks(Target.java:456) at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1405) at org.apache.tools.ant.Project.executeTarget(Project.java:1376) at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) at org.apache.tools.ant.Project.executeTargets(Project.java:1260) at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:286) at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:555) at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:153) BUILD FAILED (total time: 2 minutes 51 seconds) Could not load class (org.apache.tools.ant.taskdefs.repository.MavenRepository) for type mavenrepository Could not load a dependent class (jdepend/xmlui/JDepend) for type jdepend Could not load a dependent class (javax/media/jai/PlanarImage) for type image Could not load class (org.apache.tools.ant.taskdefs.repository.MavenRepository) for type mavenrepository Could not load a dependent class (jdepend/xmlui/JDepend) for type jdepend Could not load a dependent class (javax/media/jai/PlanarImage) for type image Here is the build-impl.xml: <target name="-do-jar-copyliblets"> <property location="${build.classes.dir}" name="build.classes.dir.resolved"/> <pathconvert property="run.classpath.without.build.classes.dir"> <path path="${run.classpath}"/> <map from="${build.classes.dir.resolved}" to=""/> </pathconvert> <nb-copyliblets runtimeclasspath="${run.classpath.without.build.classes.dir}"/> </target> Is maybe Roman's change http://hg.netbeans.org/main-silver/rev/812b25952dee the culprit?
I don't believe that particular commit is the cause because it's just moving some util methods around. The bug could be the jar.getManifest().getMainAttributes call. According to the Javadoc, getManifest() might return null if there is none. https://docs.oracle.com/javase/7/docs/api/java/util/jar/JarFile.html#getManifest()