Bug 560289

Description James Peng 2020-02-18 13:43:50 EST

I have been using Eclipse for more than 10 years. I just started to use Eclipse IDE for Enterprise Java Developer 2019-12 edition. In the past week, I was blocked by "The resource is not on the build path of a java project" error three times right in the middle of the development. The feeling is really bad. Just cannot figure out what was happened. Fortunately, I was able to make it works for me again twice by closing and delete the project and re-import the project again. But this doesn't always work. Another time I have to close the Eclipse and delete the .classpath file because I found it was modified but I don't know if that is the reason for the error. 

The last time happened 10 minutes ago. I just did a File Search and click one of the results to find where it is in the code. Then I tried to see who is the callers of the method. The error happened. Nothing special, just a normal day for Eclipse but it refused to work for me then. Before that moment, the functionality works perfectly. After close/delete/import the same project, it works again. Also tried other things, like import the epf file again, close and launch Eclipse again. None fixes the issue.