mysql « EJB « JPA Q&A

1. problem with EJB 3    stackoverflow.com

I have problem with EJB,i can do normally when current day , and i try change to next 2 day it means current is 9--> 11 . And do somewhere on ...

2. Hibernate problem with instruction remove    stackoverflow.com

I have a prbolem with hibernate entitymanager and in particular with the instruction remove. I try to remove a entity from the db but the system return this error.

ERROR [JDBCExceptionReporter] Cannot delete ...

3. I need help to understand the JPA. I'm getting MySQLMySQLIntegrityConstraintViolationException    stackoverflow.com

Possible Duplicate:
JPA Inner workings. MySQLIntegrityConstraintViolationException

4. Storing Double.POSITIVE_INFINITY in MySQL (EJB entity/JBoss)    stackoverflow.com

I have the following simple JPA entity:

@Entity
@Table( name = myentity_table )
public class MyEntity {

  private double a;
  private double b;
  //(...)
}