| Unexpected java.lang.IllegalStateException: No context available outside of the request service life [message #677488] |
Wed, 08 June 2011 16:24  |
 Arnaud MERGEY
Messages: 243
Registered: March 2010
Location: France |
Senior Member |
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Hello,
I have an issue and I cannot figure out if it comes from RAP or from something wrong in my code.
In our RAP application, we have declared our own extension point, so users can extends our application by providing their own plugin, defining this Extension.
Users can upload their plugin directly from our RAP application.
In the Action allowing to upload and install new plugin, I execute this code.
FileInputStream stream = new FileInputStream(uploadedFile);
try {
bundleContext.installBundle(location, stream).start();
} finally {
stream.close();
}
By doing this we have the exception copied above, but the action is working as expected, the newly uploaded plugin is installed and available to the application,
It is just "ugly" for us to have this exception we cannot catch.
After some investigation, it seems that a org.eclipse.core.runtime.IRegistryChangeEvent is fired, to a org.eclipse.core.runtime.IRegistryChangeListener registered by org.eclipse.ui.internal.menus.WorkbenchMenuService because the bundle I start programmatically declare a new extension instance of our extension point.
The exception occurs because this event is processed in a Thread named "Worker-1", so outside the UI Thread, and the code call Platform.getWorkbench(), in WorkbenchMenuService:
// RAP [bm]: extracted listener to detach it on session timeout
final IExtensionRegistry registry = Platform.getExtensionRegistry();
final IRegistryChangeListener registryChangeListener = new IRegistryChangeListener() {
public void registryChanged(final IRegistryChangeEvent event) {
PlatformUI.getWorkbench().getDisplay().syncExec(new Runnable() {
public void run() {
handleRegistryChanges(event);
}
});
}
};
I noticed that this listener is unregistered if the session timeout, so as a workaround, I delegate the bundle starting in background thread, and I kill the http session, I have no exception, but the user has to refresh the page after installing the plugin, that is not a big deal.
I am just wondering why RegistryChangeEvent are processed in a background thread, as they need some code to be executed in UIThread, and I am wondering if there can be some other issue because of this.
The exception is:
java.lang.IllegalStateException: No context available outside of the request service lifecycle.
at org.eclipse.rwt.internal.service.ContextProvider.getContext(ContextProvider.java:105)
at org.eclipse.rwt.internal.service.ContextProvider.getStateInfo(ContextProvider.java:153)
at org.eclipse.rwt.SessionSingletonBase.getInstance(SessionSingletonBase.java:82)
at org.eclipse.ui.internal.Workbench.getInstance(Workbench.java:653)
at org.eclipse.ui.PlatformUI.getWorkbench(PlatformUI.java:94)
at org.eclipse.ui.internal.menus.WorkbenchMenuService$1.registryChanged(WorkbenchMenuService.java:265)
at org.eclipse.core.internal.registry.ExtensionRegistry$2.run(ExtensionRegistry.java:922)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.registry.ExtensionRegistry.processChangeEvent(ExtensionRegistry.java:920)
at org.eclipse.core.runtime.spi.RegistryStrategy.processChangeEvent(RegistryStrategy.java:260)
at org.eclipse.core.internal.registry.osgi.ExtensionEventDispatcherJob.run(ExtensionEventDispatcherJob.java:50)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
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