• Post Reply Bookmark Topic Watch Topic
  • New Topic

how to tell application exception from system exception  RSS feed

 
Timber Lee
Ranch Hand
Posts: 157
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
When a call is made to a single-entity find method in an entity bean, the ObjectNotFoundException is thrown because the requested entity was not found,It is not automatically rolled back because it is an application exception , instead of system exception .
my question is how to tell application exception from system exception ?
 
Chris Mathews
Ranch Hand
Posts: 2712
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
For these types of questions it is always best to look to the EJB Specification for the answer. It has the following to say about Application Exceptions:
From Section 18.1.1 of the EJB 2.0 Specification
An application exception class must be a subclass (direct or indirect) of java.lang.Exception. An application exception class must not be defined as a subclass of the java.lang.RuntimeException or of the java.rmi.RemoteException.

Therefore, a System Exception is a RuntimeException, RemoteException, or subclass of either. An Application Exception is anything else.
CreateException, RemoveException, FinderException, and ObjectNotFoundException are all Application Exceptions. EJBException is a System Exception.
BTW, this is getting too detailed for the SCEA exam.
[ February 09, 2003: Message edited by: Chris Mathews ]
 
It is sorta covered in the JavaRanch Style Guide.
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!