ClassCastException at org.eclipse.xtext.builder.clustering.ClusteringBuilderState.doUpdate(Clusterin

Question

Hi,
After upgrading xtext to 2.7.3 i get this exception in some cases
java.lang.ClassCastException: null
2015-07-02 13:44:19,842 ERROR o.e.x.b.c.ClusteringBuilderState: Error resolving cross references on resource 'platform:/resource/models/Demo/examples/comp.start'
java.lang.ClassCastException: null
2015-07-02 13:44:19,842 ERROR org.apache.log4j: org.eclipse.xtext.builder.clustering.ClusteringBuilderState - Error loading resource from: platform:/resource/models/Demo/examples/comp.start
org.eclipse.xtext.builder.resourceloader.IResourceLoader$LoadOperationException: java.lang.ClassCastException
at org.eclipse.xtext.builder.clustering.ClusteringBuilderState.doUpdate(ClusteringBuilderState.java:230)
at org.eclipse.xtext.builder.builderState.AbstractBuilderState.update(AbstractBuilderState.java:112)
at org.eclipse.xtext.builder.impl.XtextBuilder.doBuild(XtextBuilder.java:187)
at org.eclipse.xtext.builder.impl.XtextBuilder.incrementalBuild(XtextBuilder.java:167)
at org.eclipse.xtext.builder.impl.XtextBuilder.build(XtextBuilder.java:95)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:728)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:239)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:292)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:295)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:351)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:374)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:143)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:241)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Any idea on how to get rid of this ??

Answer 1

This class will be called while starting the tool
public class dslXtextUtilities {
@Inject
Injector injector;
public org.eclipse.emf.ecore.resource.Resource parseString(String str){
org.eclipse.emf.ecore.resource.Resource xtextResource = null;
try {
URI uri = URI.createURI("stdt.dsl", true);
VhdlParser parser = injector.getInstance(VhdlParser.class);
XtextResourceSet xtextResourceSet = injector.getInstance(XtextResourceSet.class);
xtextResource = xtextResourceSet.createResource(uri);
xtextResourceSet.addLoadOption(XtextResource.OPTION_RESOLVE_ALL, Boolean.TRUE);
InputStream inputStream = new LazyStringInputStream(str);
((XtextResource) xtextResource).setParser(parser);
((XtextResource) xtextResource).load(inputStream, xtextResourceSet.getLoadOptions());
} catch (Exception e) {
return xtextResource;
return xtextResource;
==============================================
Here is the call
public class MApp implements IApplication {
public Object start(IApplicationContext context) throws Exception {
// unnecessaryExceptions
try {
dslXtextUtilities.parseString("int x = 0;");