Exception-handling in Struts
For a simple and generic solution to the boring and code-aesthetics ruining routine of catching rare exceptions in your Struts-actions, try a global exceptionhandler.
1) In struts-config.xml:
<global-exceptions> <exception type="yourpackage.YourDAOException" key="error.dao.generic" path="/error.jsp"/> </global-exceptions>
2) Add an entry in your ApplicationResources.properties. Something like:
error.dao.generic = There was a problem accessing the database
3) Create an errorpage with
<html :errors/> somewhere in the body
Also, you could add
handler="yourpackage.ActionExceptionHandler" to the exception declaration in struts-config. Then, create this handler class by extending
org.apache.struts.action.ExceptionHandler and write some code that logs the exceptions or does other useful things.
Now, everytime you need to write a try-catch block for a YourDAOException, and all you do in it is adding some errors to the ActionErrors object and forwarding to a ‘failure-page’, you can just let the globalexception-thingy do it’s job.