Parsing malformed import statement triggers NullPointerException

[pkonopel]

Adding the line import TestImport (terminated with a '\n') to a .fidl file opened in Eclipse IDE and executing File/Save triggers a NullPointerException.

This behavior is reproducible with Franca 0.9.1 (with Java 1.8 and Eclipse Mars) and 0.10.0 (with Java 1.7 and Eclipse Mars SR1). It can be triggered by adding a line as described above to an otherwise well-formed Franca file. The call stack with Franca 0.9.1 is copied below.

java.lang.NullPointerException
    at org.eclipse.emf.common.util.URI.createURIWithCache(URI.java:2567)
    at org.eclipse.emf.common.util.URI.createURI(URI.java:2445)
    at org.eclipse.xtext.EcoreUtil2.getResource(EcoreUtil2.java:490)
    at org.franca.core.dsl.resource.FrancaCoreEObjectDescriptions$1.apply(FrancaCoreEObjectDescriptions.java:76)
    at org.franca.core.dsl.resource.FrancaCoreEObjectDescriptions$1.apply(FrancaCoreEObjectDescriptions.java:1)
    at org.eclipse.xtext.xbase.lib.internal.FunctionDelegate.apply(FunctionDelegate.java:42)
    at com.google.common.collect.Lists$TransformingRandomAccessList.get(Lists.java:572)
    at java.util.AbstractList$Itr.next(Unknown Source)
    at com.google.common.collect.Iterators$7.computeNext(Iterators.java:646)
    at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
    at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
    at com.google.common.collect.TransformedIterator.hasNext(TransformedIterator.java:43)
    at com.google.common.base.Joiner.appendTo(Joiner.java:107)
    at com.google.common.base.Joiner.appendTo(Joiner.java:152)
    at com.google.common.base.Joiner.join(Joiner.java:193)
    at com.google.common.base.Joiner.join(Joiner.java:183)
    at org.eclipse.xtext.xbase.lib.IteratorExtensions.join(IteratorExtensions.java:414)
    at org.eclipse.xtext.xbase.lib.IterableExtensions.join(IterableExtensions.java:376)
    at org.franca.core.dsl.resource.FrancaCoreEObjectDescriptions._create(FrancaCoreEObjectDescriptions.java:88)
    at org.franca.core.dsl.resource.FrancaCoreEObjectDescriptions.create(FrancaCoreEObjectDescriptions.java:99)
    at org.franca.core.dsl.resource.FrancaCoreResourceDescriptionStrategy.createEObjectDescriptions(FrancaCoreResourceDescriptionStrategy.java:19)
    at org.eclipse.xtext.resource.impl.DefaultResourceDescription.computeExportedObjects(DefaultResourceDescription.java:89)
    at org.eclipse.xtext.resource.impl.DefaultResourceDescription$4.get(DefaultResourceDescription.java:179)
    at org.eclipse.xtext.resource.impl.DefaultResourceDescription$4.get(DefaultResourceDescription.java:1)
    at org.eclipse.xtext.util.OnChangeEvictingCache.get(OnChangeEvictingCache.java:77)
    at org.eclipse.xtext.resource.impl.DefaultResourceDescription.getLookUp(DefaultResourceDescription.java:173)
    at org.eclipse.xtext.resource.impl.AbstractResourceDescription.getExportedObjects(AbstractResourceDescription.java:35)
    at org.eclipse.xtext.resource.impl.DefaultResourceDescription.computeReferenceDescriptions(DefaultResourceDescription.java:136)
    at org.eclipse.xtext.resource.impl.DefaultResourceDescription$2.get(DefaultResourceDescription.java:123)
    at org.eclipse.xtext.resource.impl.DefaultResourceDescription$2.get(DefaultResourceDescription.java:1)
    at org.eclipse.xtext.util.OnChangeEvictingCache.get(OnChangeEvictingCache.java:77)
    at org.eclipse.xtext.resource.impl.DefaultResourceDescription.getReferenceDescriptions(DefaultResourceDescription.java:120)
    at org.eclipse.xtext.resource.DescriptionUtils.collectOutgoingReferences(DescriptionUtils.java:29)
    at org.eclipse.xtext.resource.impl.DefaultResourceDescriptionManager.isAffected(DefaultResourceDescriptionManager.java:117)
    at org.eclipse.xtext.ui.editor.DirtyStateEditorSupport.isReparseRequired(DirtyStateEditorSupport.java:625)
    at org.eclipse.xtext.ui.editor.DirtyStateEditorSupport$UpdateEditorStateJob$1.exec(DirtyStateEditorSupport.java:157)
    at org.eclipse.xtext.ui.editor.DirtyStateEditorSupport$UpdateEditorStateJob$1.exec(DirtyStateEditorSupport.java:1)
    at org.eclipse.xtext.resource.OutdatedStateManager.exec(OutdatedStateManager.java:121)
    at org.eclipse.xtext.ui.editor.model.XtextDocument$XtextDocumentLocker.internalReadOnly(XtextDocument.java:520)
    at org.eclipse.xtext.ui.editor.model.XtextDocument$XtextDocumentLocker.readOnly(XtextDocument.java:492)
    at org.eclipse.xtext.ui.editor.model.XtextDocument.readOnly(XtextDocument.java:133)
    at org.eclipse.xtext.ui.editor.DirtyStateEditorSupport$UpdateEditorStateJob.run(DirtyStateEditorSupport.java:142)
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)