JPA - Unknown entity bean class

Question

Hopefully, I can explain this issue properly. I have 3 classes that deals with my entities.

@MappedSuperclass
public abstract class Swab implements ISwab {
         


        

Answer 1

Mario was right when he mentions EntityManagerFactory here.

Both:

java.lang.IllegalArgumentException: Unknown entity bean class...

and

java.lang.IllegalStateException: This web container has not yet been started...

These exceptions occur when you redeploy a web application multiple times but didn't close EntityManagerFactory properly.

follow this instruction to register ServletContextListener and this instruction to close EntityManagerFactory properly.