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Currently, when Javadoc for a particular class is not available, the code completion documentation window displays the following message: "Javadoc not found. Either Javadoc documentation for this item does not exist or you have not added specified Javadoc in the Java Platform Manager or the Library Manager." It would be nice if there was a way to download or register Javadoc directly from this window, for well known Javadocs, such as Java SE and Java EE. So, if the missing Javadoc is for a class from Java SE, there would be UI that would allow the user to point to Java SE Javadoc on their disk, or download the Javadoc (either from the Java SE website or from AutoUpdate). Similarly for Java EE. (This means that there may need to be a pluggable mechanism that would allow modules to provide the appropriate UI based on e.g. a class name.) This enhancement will be important if we decide to eliminate all closed source components from the build - the Java EE Javadoc is under a closed source license. I am attaching the screenshot of the current UI.
Created attachment 36511 [details] screenshot
Also this will help in addressing issue 85385 - Javadoc for JPA in the "Basic" distribution.