STS project gives error cannot be read or is not a valid ZIP file

Question

I am for the first time trying java in Spring Tool Suite and using an example project imported, now running into endless issues. I tried building the project and go the following error:

 Archive for required library: 'C:/Users/cccc/.m2/repository/com/vaadin/vaadin-client/7.1.0/
 vaadin-client-7.1.0.jar' in project 'quicktickets-dashboard' cannot be read or is not a 
 valid ZIP   file   quicktickets-dashboard      Build path  Build Path Problem

This is probably a spring issue and not related to the project itself. Please does anyone have a working solution to this. Tried a few, building, closing, rebuilding, deleting local repository etc. but still the same issue. Any ideas appreciated.

Answer 1

The most likely explanation is that your maven cache is corrupted. First, check if the C:/Users/cccc/.m2/repository/com/vaadin/vaadin-client/7.1.0/vaadin-client-7.1.0.jar jar is complete. Run jar tvf on the file to make sure you can use it.

If you're lucky, things will work if you delete the C:/Users/cccc/.m2/repository/com/vaadin/vaadin-client/7.1.0/ folder, but if that doesn't work, you will have to try deleting C:/Users/cccc/.m2/repository. It's just a local cache of artifacts downloaded from maven central or an internal repository, so it is OK to delete.

I am 90% certain this would fix your problem.

Answer 2

I clear /.m2/repository/.cache and it works fine.