call-onsave:
    [java] java.lang.NullPointerException
    [java]  at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:194)
    [java]  at org.apache.tools.ant.taskdefs.Java.run(Java.java:771)
    [java]  at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:221)
    [java]  at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:135)
    [java]  at org.apache.tools.ant.taskdefs.Java.execute(Java.java:108)
    [java]  at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
    [java]  at sun.reflect.GeneratedMethodAccessor216.invoke(Unknown Source)
    [java]  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    [java]  at java.lang.reflect.Method.invoke(Method.java:606)
    [java]  at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    [java]  at org.apache.tools.ant.Task.perform(Task.java:348)
    [java]  at org.apache.tools.ant.Target.execute(Target.java:392)
    [java]  at org.apache.tools.ant.Target.performTasks(Target.java:413)
    [java]  at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
    [java]  at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
    [java]  at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
    [java]  at org.eclipse.ant.internal.core.ant.EclipseDefaultExecutor.executeTargets(EclipseDefaultExecutor.java:32)
    [java]  at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
    [java]  at org.eclipse.ant.internal.core.ant.InternalAntRunner.run(InternalAntRunner.java:672)
    [java]  at org.eclipse.ant.internal.core.ant.InternalAntRunner.run(InternalAntRunner.java:498)
    [java]  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    [java]  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    [java]  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    [java]  at java.lang.reflect.Method.invoke(Method.java:606)
    [java]  at org.eclipse.ant.core.AntRunner.run(AntRunner.java:378)
    [java]  at org.eclipse.ant.internal.launching.launchConfigurations.AntLaunchDelegate.runInSameVM(AntLaunchDelegate.java:307)
    [java]  at org.eclipse.ant.internal.launching.launchConfigurations.AntLaunchDelegate.launch(AntLaunchDelegate.java:260)
    [java]  at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:858)
    [java]  at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:707)
    [java]  at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:700)
    [java]  at org.eclipse.core.externaltools.internal.model.ExternalToolBuilder.launchBuild(ExternalToolBuilder.java:181)
    [java]  at org.eclipse.core.externaltools.internal.model.ExternalToolBuilder.doBuildBasedOnScope(ExternalToolBuilder.java:169)
    [java]  at org.eclipse.core.externaltools.internal.model.ExternalToolBuilder.build(ExternalToolBuilder.java:88)
    [java]  at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:733)
    [java]  at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    [java]  at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:206)
    [java]  at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:246)
    [java]  at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:299)
    [java]  at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    [java]  at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:302)
    [java]  at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:358)
    [java]  at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:381)
    [java]  at org.eclipse.core.internal.resources.Workspace.buildInternal(Workspace.java:514)
    [java]  at org.eclipse.core.internal.resources.Workspace.build(Workspace.java:433)
    [java]  at org.eclipse.ui.actions.BuildAction$1.runInWorkspace(BuildAction.java:305)
    [java]  at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
    [java]  at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)
    [java] Caused by: java.lang.NullPointerException
    [java]  at org.strategoxt.imp.runtime.Environment.getDescriptor(Environment.java:386)
    [java]  at org.strategoxt.imp.runtime.FileState.getFile(FileState.java:66)
    [java]  at org.strategoxt.imp.metatooling.building.AntForceOnSave.main(AntForceOnSave.java:17)
    [java]  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    [java]  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    [java]  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    [java]  at java.lang.reflect.Method.invoke(Method.java:606)
    [java]  at org.apache.tools.ant.taskdefs.ExecuteJava.run(ExecuteJava.java:217)
    [java]  at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:152)
    [java]  ... 46 more
    [java] Java Result: -1

Submitted by Eddy Bertoluzzo on 14 March 2014 at 09:34

I’ve added some guarding and error message handling in https://github.com/metaborg/spoofax/commit/e0de7671d65adcb1f85d093ece1a2910974b3725. Can you check with the nightly version of Spoofax after it is done building? (status at http://hydra.nixos.org/jobset/spoofax/spoofax-master)