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When you hover over an SDK type like IPlatformRunnable you get its Javadoc in a little popup window. When you press F2 you get a bigger popup window. There's also a Javadoc view. All these are source-based. When you press Shift- F2 (external Javadoc) you get an error message that says "The documentation location for 'IPlatform Runnable' has not been configured. For elements from libraries specify the Javadoc location URL on the properties page of the parent JAR ('runtime.jar')." If it matters I have done a binary import of all plug-ins. If this were a Java JDK type and I was using a JDK instead of a JRE then this would have worked. It's just a problem for the Eclipse platform classes and types. I shouldn't have to configure anything else to go to the Javadoc page for this type. I can navigate manually to the Javadoc page in the help but it's time consuming. The reason that hover and F2 are insufficient is that you don't get the context - you can't hyperlink to related types and packages. So the enhancement request is to automatically configure the settings so that shift- F2 in the Java text editor will work on all Platform SDK types with no searching or special configuration needed on the user's part. Not sure if the right product/component for this so please redirect as appropriate.
Importing using PDE attaches the source and it could also fill in the correct Javadoc path.
That would be ok though it would be even nicer if it didn't require an import step. If you're using an SDK symbol in your plug-in code then IIRC hover and F2 will work whether or not you've imported.
*** This bug has been marked as a duplicate of 52894 ***