I have this two erros when trying to see some method documentation or anything else of java.
Note: This element has no attached source and the Javadoc could not be found in the attached Javadoc. Note: An exception occurred while getting the Javadoc. See log for details.
It's the first time that happens.
Thanks
Try going to settings and point out the installed JDK folder like this ,
Window->Preference->
search for 'Jre'in the search field , choose Installed JRE's->Edit
and change the setting to point to your JDK folder instead of JRE , it worked for me .