[jbosstools-issues] [JBoss JIRA] Resolved: (JBIDE-3661) FreeMarker IDE Plugin Hangs Eclipse with "SWTError: No more handles"

FreeMarker IDE Plugin Hangs Eclipse with "SWTError: No more handles" -------------------------------------------------------------------- Key: JBIDE-3661 URL: https://jira.jboss.org/jira/browse/JBIDE-3661 Project: Tools (JBoss Tools) Issue Type: Bug Components: FreeMarker Environment: All Reporter: kaliatech Assignee: Snjezana Peco The FreeMarker IDE plugin hangs my Eclipse instance after some time when editing larger FreeMarker templates. The Eclipse workspace log shows multiple exceptions before hanging, and the errors seem to start from within the FreeMarker plugin. The errors generally contain a message like "org.eclipse.swt.SWTError: No more handles". See the forum post for more detail. I'm not an expert with Eclipse/SWT/Plugin development, but looking through code in SVN, it doesn't look like the label images used in the Freemarker Outline view tree are being disposed. The plugin's ImageManager creates the label images that are then used by the plugin's OutlineLabelProvider. However, I don't see where those images are ever disposed. My guess is that outline labels are created/reconstructed quite often, and so more and more images get created but never disposed. Assuming SWT images are immutable and can be reused, the fix might be as simple as modifying OutlineLabelProvider to cache the images in a map by the filename. Then, making sure they are reused on every call to the provider. (Whatever caches the images should also dispose them when itself is disposed, but if the images are being reused, it probably doesn't matter much.)