No Persistence provider for EntityManager named

Question

I have my persistence.xml with the same name using TopLink under the META-INF directory. Then, I have my code calling it with:

Answer 1

If you are using Eclipse make sure that exclusion pattern does not remove your persistence.xml from source folders on build path.

1. Go to Properties -> Java Build Path -> Source tab
2. Check your exclusion pattern which is located at
   MyProject/src/main/java -> Excluded:
   tree node
3. Optionally, set it to Excluded: (None) by selecting the node and clicking Edit... button on the left.