[java] Java Persistence API (JPA) Entity Rule: Top Level Class

[numeralnathan]

Proposed Rule Name: JPATopLevelClass

Proposed Category: Bug

Description:

When a class is annotated with JPA's @Entity, there are certain requirements placed on the class. Please create a rule that requires the class to be a top-level class.

Note: Hibernate does not have this requirement. So, those using Hibernate will need to disable this rule.

Code Sample:

The following class will cause a problem at runtime because it is a nested class.

class MyClass
{
   @Entity
   class MyEntity
   {
      ...
   }
}

Possible Properties:

I cannot think of any. Can you?