Lost Javadoc in JDK classes
已回答
IntellIJ used to me show me the comments and Javadoc for JDK classes (e.g. Future, or Collection)
It stopped. Maybe it was a Java update on my system? Maybe it was an Intellij upgrade? I don't know why, but I'd like to fix it. Could it be a different between the java version installed on my system (Ubuntu) or that fact that I"m using OpenJDK?
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See External documentation for reference. To have JavaDoc available it must be
1. Either present in source code
2. Javadoc link or jar file should be configured for the library (or JDK in your case)
On screenshot it is seen you do not have sources attached for the JDK. Either download them and add for the JDK or specify external documentation URL as shown in referenced documentation topic.