Eclipse Community Forums: Dynamic Languages Toolkit (DLTK) » NullPointerException related to AbstractInterpreterInstallType

Home » Eclipse Projects » Dynamic Languages Toolkit (DLTK) » NullPointerException related to AbstractInterpreterInstallType

Show: Today's Messages :: Show Polls :: Message Navigator

NullPointerException related to AbstractInterpreterInstallType [message #663009]

Fri, 01 April 2011 23:53

Timothy Wall

Messages: 21
Registered: July 2009

Junior Member

I'm seeing the following exception show up in numerous places but I'm at a loss to determine how to resolve it.

I've implemented a basic editor and run capabilities, and am now trying to get a simple type navigator hooked up according to the wiki at ( http://wiki.eclipse.org/DLTK_IDE_Guide:Step_3._Towards_an_ID E). Can't get even the simple, hard-coded type hierarchy to display (my project seems to work ok, as does script selection for running). The following error shows up from time to time, although I think it's unrelated to the type hierarchy working.

(Running DLTK 2.0, comparing with the ruby implementation from the CVS 2.0 tag)

java.lang.NullPointerException
	at org.eclipse.core.internal.filesystem.local.LocalFile.getChild(LocalFile.java:171)
	at org.eclipse.dltk.internal.launching.execution.EFSDeployment.getFile(EFSDeployment.java:128)
	at org.eclipse.dltk.internal.launching.AbstractInterpreterInstallType$2.run(AbstractInterpreterInstallType.java:685)
	at org.eclipse.dltk.internal.launching.AbstractInterpreterInstallType.runLibraryLookup(AbstractInterpreterInstallType.java:428)
	at org.eclipse.dltk.internal.launching.AbstractInterpreterInstallType.getDefaultLibraryLocations(AbstractInterpreterInstallType.java:757)
	at org.eclipse.dltk.launching.ScriptRuntime.getLibraryLocations(ScriptRuntime.java:975)
	at org.eclipse.dltk.launching.ScriptRuntime.getLibraryLocations(ScriptRuntime.java:963)
	at org.eclipse.dltk.internal.launching.InterpreterContainer.computeBuildpathEntries(InterpreterContainer.java:135)
	at org.eclipse.dltk.internal.launching.InterpreterContainer.getBuildpathEntries(InterpreterContainer.java:118)
	at org.eclipse.dltk.internal.launching.InterpreterContainer.computeBuildpathEntries(InterpreterContainer.java:221)
	at org.eclipse.dltk.internal.launching.InterpreterContainer.getBuildpathEntries(InterpreterContainer.java:215)
	at org.eclipse.dltk.internal.core.ModelManager.containerPutIfInitializingWithSameEntries(ModelManager.java:2130)
	at org.eclipse.dltk.core.DLTKCore.setBuildpathContainer(DLTKCore.java:1994)
	at org.eclipse.dltk.internal.launching.InterpreterContainerInitializer.initialize(InterpreterContainerInitializer.java:62)
	at org.eclipse.dltk.internal.core.ModelManager.initializeContainer(ModelManager.java:1895)
	at org.eclipse.dltk.internal.core.ModelManager.getBuildpathContainer(ModelManager.java:1725)
	at org.eclipse.dltk.core.DLTKCore.getBuildpathContainer(DLTKCore.java:1772)
	at org.eclipse.dltk.internal.core.ScriptProject.getResolvedBuildpath(ScriptProject.java:428)
	at org.eclipse.dltk.internal.core.ScriptProject.getResolvedBuildpath(ScriptProject.java:332)
	at org.eclipse.dltk.internal.core.ScriptProject.getResolvedBuildpath(ScriptProject.java:275)
	at org.eclipse.dltk.internal.core.ScriptProject.buildStructure(ScriptProject.java:672)
	at org.eclipse.dltk.internal.core.Openable.generateInfos(Openable.java:188)
	at org.eclipse.dltk.internal.core.ModelElement.openWhenClosed(ModelElement.java:184)
	at org.eclipse.dltk.internal.core.ModelElement.getElementInfo(ModelElement.java:171)
	at org.eclipse.dltk.internal.core.ModelElement.getChildren(ModelElement.java:356)
	at org.eclipse.dltk.internal.core.ModelElement.getChildren(ModelElement.java:351)
	at org.eclipse.dltk.internal.core.ScriptProject.getProjectFragments(ScriptProject.java:1483)
	at org.eclipse.dltk.internal.core.search.DLTKSearchScope.add(DLTKSearchScope.java:164)
	at org.eclipse.dltk.internal.core.search.DLTKSearchScope.add(DLTKSearchScope.java:126)
	at org.eclipse.dltk.core.search.BasicSearchEngine.createSearchScope(BasicSearchEngine.java:209)
	at org.eclipse.dltk.core.search.BasicSearchEngine.createSearchScope(BasicSearchEngine.java:189)
	at org.eclipse.dltk.core.search.SearchEngine.createSearchScope(SearchEngine.java:253)
	at org.eclipse.dltk.internal.core.SourceType.createReferencingProjectsScope(SourceType.java:459)
	at org.eclipse.dltk.internal.core.SourceType.newTypeHierarchy(SourceType.java:471)
	at org.eclipse.dltk.internal.ui.typehierarchy.TypeHierarchyLifeCycle.createTypeHierarchy(TypeHierarchyLifeCycle.java:126)
	at org.eclipse.dltk.internal.ui.typehierarchy.TypeHierarchyLifeCycle.doHierarchyRefresh(TypeHierarchyLifeCycle.java:165)
	at org.eclipse.dltk.internal.ui.typehierarchy.TypeHierarchyLifeCycle$1.run(TypeHierarchyLifeCycle.java:106)
	at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)

Report message to a moderator

Re: NullPointerException related to AbstractInterpreterInstallType [message #663440 is a reply to message #663009]

Tue, 05 April 2011 05:28

Alex Panchenko

Messages: 3
Registered: July 2009

Junior Member

Hi Timothy,

@Override
protected ILookupRunnable createLookupRunnable(
IFileHandle installLocation,
List<LibraryLocation> locations,
EnvironmentVariable[] variables) {
return new ILookupRunnable() {
public void run(IProgressMonitor monitor)
throws InvocationTargetException, InterruptedException {
}
};
}
in your implementation of InterpreterInstallType if your interpreter
doesn't have a concept of system external libraries.

It will be improved in next version.

Regards,
Alex

Report message to a moderator

Re: NullPointerException related to AbstractInterpreterInstallType [message #663549 is a reply to message #663440]

Tue, 05 April 2011 15:12

Timothy Wall

Messages: 21
Registered: July 2009

Junior Member

I worked around the issue by overriding AbstractInterpreterInstallType.getDefaultLibraryLocations so that it returns an empty list.

I'm not certain if I'm going to need to use any "external library" functionality, that depends on whether the language has something that's almost, but not entirely, unlike external libraries.

Report message to a moderator

Previous Topic:	Package not found
Next Topic:	Use DefaultProblem to put error marker in editor

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

]

Current Time: Fri Apr 26 03:25:40 GMT 2024

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter