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I recently switched from java 8 to java 11 in eclipse, by installing the newer jdk and switching the jre in eclipse. The first thing i noticed, that was not working properly, was the javadoc, which read : "Note: This element has no attached source and the Javadoc could not be found in the attached Javadoc."
I then looked up other users with similar problems, but they were all using different versions of java, and the link in my javadoc configuration doesn't work.
(the validate button when selecting the javadoc url also returns "Location might be invalid." for the URL "https://docs.oracle.com/en/java/javase/11/docs/api/").
I suspect that I still have an the old java 8 javadoc installed, which is now looking in the wrong place, but i couldn't find another java 11 javadoc link anywhere.
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Step 1 − Open eclipse, select the option Project →Generate Javadoc. Step 2 − Select the javadoc.exe file from the bin folder of java installation directory, select the destination folder for the generated java doc and select Next. finish button.
To see the javadoc of a class having attached source in eclipse: select Window -> show view -> javadoc (or alt + shift + q, j). then in the javadoc view, right click -> open attached javadoc (or shift + F2), this will display the javadoc of the class in the internal browser of eclipse.
From the main menu, select Tools | Generate JavaDoc. In the dialog that opens, select a scope — a set of files or directories for which you want to generate the reference, and set the output directory where the generated documentation will be placed.
Fortunately, all modern versions of the JDK provide the Javadoc tool – for generating API documentation from comments present in the source code.
As a workaround, download the offline documentation from https://www.oracle.com/java/technologies/javase-jdk11-doc-downloads.html
In your Eclipse project, open "JRE System Library", right-click "java.base", choose "Properties" from context menu.
In the dialog, check the radio button "Javadoc in archive". For the field "Archive path", browse to your downloaded zip. For the field "Path within archive", browse to "docs/api/java.base". Then, "Apply and Close".
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