Description Pierre-Yves Bigourdan 2020-04-27 10:53:41 EDT

I noticed the following error pop up in my error log:

Exception occurred during compilation unit conversion:
----------------------------------- SOURCE BEGIN -------------------------------------

/**
 */
public class Main {
    public Main() {}
    public Map<String, String> subscribe() {
    public Map<String, String> subscribe() {
----------------------------------- SOURCE END -------------------------------------

And the associated stack trace:
java.lang.IllegalArgumentException
	at org.eclipse.jdt.core.dom.ASTNode.setSourceRange(ASTNode.java:3105)
	at org.eclipse.jdt.core.dom.ASTConverter.convert(ASTConverter.java:737)
	at org.eclipse.jdt.core.dom.ASTConverter.buildBodyDeclarations(ASTConverter.java:207)
	at org.eclipse.jdt.core.dom.ASTConverter.convert(ASTConverter.java:3223)
	at org.eclipse.jdt.core.dom.ASTConverter.convert(ASTConverter.java:1512)
	at org.eclipse.jdt.core.dom.AST.convertCompilationUnit(AST.java:449)
	at org.eclipse.jdt.internal.core.CompilationUnit.buildStructure(CompilationUnit.java:200)
	at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:268)
	at org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:596)
	at org.eclipse.jdt.internal.core.CompilationUnit.makeConsistent(CompilationUnit.java:1138)
	at org.eclipse.jdt.internal.core.ReconcileWorkingCopyOperation.makeConsistent(ReconcileWorkingCopyOperation.java:173)
	at org.eclipse.jdt.internal.core.ReconcileWorkingCopyOperation.executeOperation(ReconcileWorkingCopyOperation.java:94)
	at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:736)
	at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:802)
	at org.eclipse.jdt.internal.core.CompilationUnit.reconcile(CompilationUnit.java:1315)
	at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.reconcile(JavaReconcilingStrategy.java:131)
	at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.access$0(JavaReconcilingStrategy.java:113)
	at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy$1.run(JavaReconcilingStrategy.java:93)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
	at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.reconcile(JavaReconcilingStrategy.java:90)
	at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.reconcile(JavaReconcilingStrategy.java:157)
	at org.eclipse.jdt.internal.ui.text.CompositeReconcilingStrategy.reconcile(CompositeReconcilingStrategy.java:94)
	at org.eclipse.jdt.internal.ui.text.JavaCompositeReconcilingStrategy.reconcile(JavaCompositeReconcilingStrategy.java:107)
	at org.eclipse.jface.text.reconciler.MonoReconciler.process(MonoReconciler.java:76)
	at org.eclipse.jface.text.reconciler.AbstractReconciler$BackgroundThread.run(AbstractReconciler.java:210)


The above code is obviously wrong, but I ended up with something along those lines after applying stashed changes that resulted in conflicts. Given that the file I was working on contains confidential code, I've only attached a stripped down version that allows to reproduce the issue (hence why the ">>>>>>> stash" and similar Git conflict texts are missing).

Not sure if there's actually any problem with JDT Core here (apart from the spam in the error log, as two org.eclipse.jdt.ui and one org.eclipse.jdt.core messages appeared repeatedly until I managed to get some of the conflicts resolved), but I thought I would report it anyway in case there's anything interesting to get out of it. One observation is that removing any line from the above snippet, *including the first empty line*, makes the problem go away.

Note that I'm using the latest JDT nightly build from April 26th.