NPE in org.apache.ivyde.eclipse.IvyPlugin.getIvy
------------------------------------------------
Key: IVYDE-132
URL: https://issues.apache.org/jira/browse/IVYDE-132
Project: IvyDE
Issue Type: Bug
Components: classpath container
Affects Versions: 2.0.0.alpha1
Environment: Eclipse 3.2.2 / Rational v7.0 (pre 7.5)
Reporter: Mladen Maravic
Priority: Minor
Sometimes, IvyDE would cause the following errors to be logged into the Eclipse
error log:
java.lang.NullPointerException
at org.eclipse.jface.dialogs.IconAndMessageDialog.getSWTImage(Unknown
Source)
at
org.eclipse.jface.dialogs.IconAndMessageDialog.getWarningImage(Unknown Source)
at org.eclipse.jface.dialogs.MessageDialog.<init>(Unknown Source)
at org.eclipse.jface.dialogs.MessageDialog.openWarning(Unknown Source)
at org.apache.ivyde.eclipse.IvyPlugin.getIvy(Unknown Source)
at
org.apache.ivyde.eclipse.cpcontainer.IvyClasspathContainer.computeClasspathEntries(Unknown
Source)
at
org.apache.ivyde.eclipse.cpcontainer.IvyClasspathContainer.scheduleRefresh(Unknown
Source)
at
org.apache.ivyde.eclipse.cpcontainer.IvyClasspathInitializer.initialize(Unknown
Source)
at
org.eclipse.jdt.internal.core.JavaModelManager.initializeContainer(Unknown
Source)
at org.eclipse.jdt.internal.core.JavaModelManager$8.run(Unknown Source)
at org.eclipse.core.internal.resources.Workspace.run(Unknown Source)
at
org.eclipse.jdt.internal.core.JavaModelManager.initializeAllContainers(Unknown
Source)
at
org.eclipse.jdt.internal.core.JavaModelManager.getClasspathContainer(Unknown
Source)
at org.eclipse.jdt.core.JavaCore.getClasspathContainer(Unknown Source)
at
org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath(Unknown Source)
at
org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath(Unknown Source)
at
org.eclipse.jdt.internal.core.DeltaProcessingState.initializeRoots(Unknown
Source)
at org.eclipse.jdt.core.JavaCore.initializeAfterLoad(Unknown Source)
at
org.eclipse.jdt.internal.ui.InitializeAfterLoadJob$RealJob.run(Unknown Source)
at org.eclipse.core.internal.jobs.Worker.run(Unknown Source)
(I've seen instances where line number are present!).
This is due to the fact that the org.apache.ivyde.eclipse.IvyPlugin.getIvy()
method uses MessageDialog.openWarning method. MessageDialog uses
Display.getCurrent() internally. This results in errors if
MessageDialog.openXXXX is used outside of the UI thread.
To correct this, every MessageDialog.openXYZ in getIvy method should be
surrounded by this code:
Display.getDefault().asyncExec(new Runnable() {
public void run() {
MessageDialog.openXYZ(.......);
}
});
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