X cannot be added because it is already mapped to the entities. X entity class and the entity is not in current project source

Question

I'm creating a new NetBeans EE Enterprise Application, and when I try to create Entity classes from database (Customer from the sample database), I can't select it because of this error :

enter image description here

Any idea? I'm using NetBeans 7.3 with Glassfish 3.1.2.

Any update to this problem? I am facing the same issue as well also. — Lawrence Wong, Aug 15 '14 at 13:29

score 19 · Answer 1 · answered Aug 15 '14 at 13:37

19

I found the answer after spending the last few hours searching in Google. Delete the cache folder in the following

C:\Users\yourusername\AppData\Local\NetBeans\Cache

It solved the problem for me.

answered Aug 15 '14 at 13:37

Lawrence Wong

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score 0 · Answer 2 · answered Feb 19 '19 at 08:31

In case of NetBeans for Linux the answer of @Lawrence Wong applies too; but the cache folder is located in ~/.cache/netbeans (at least in Fedora).

In my case, the problem was probably caused by assigning an Entity Class from a database in a test project that no longer exists.

X cannot be added because it is already mapped to the entities. X entity class and the entity is not in current project source

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