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

I also had this error but the issue was the namespace uri in the persistence.xml.

I replaced http://xmlns.jcp.org/xml/ns/persistence to http://java.sun.com/xml/ns/persistence and the version 2.1 to 2.0.

It's now working.