Shailesh Arvind Vaishampayan created WW-4234:
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Summary: Ability to catch service layer exceptions at one place
and allow adding action messages/errors before results are rendered
Key: WW-4234
URL: https://issues.apache.org/jira/browse/WW-4234
Project: Struts 2
Issue Type: New Feature
Affects Versions: 2.3.15.3
Reporter: Shailesh Arvind Vaishampayan
I am working with an application involoving Struts2 in web layer and Spring in
business layer. I also have BusinessException class which will be used by all
business services to create business related validation failures which must go
up to web layer and should be show to users as validation message. I can easily
do this by writing in my Action class:
ClientAction extends ActionSupport throws Exception{
....
try{
clientService.searchClient();
}catch(InvalidClientSearchCriteriaException e){
addActionMessage("Invlid Search Criteria");
}
...
And similar code in every action class. However i dont want to pollute my
action classes with try catch blocks. Instead it would be much better if i can
write on try catch block at one place and catch all the exceptions there as
BusinessExceptions and create messages /errors from embedded messages/errors in
those exceptions. One approach i could think of was to use interceptor or
preResultListener. But I cannot use interceptor like below which catches
business exceptions thrown from action classes...
ExceptionInterceptor extends AbstractInterceptor(ActionInvocation
ivocation,...){
try{
invocation.invoke();
}catch(Exception e){
if(e instanceof BusinessException){
ActionSupport as = (ActionSupport)invocation.getAction();
String message = extractMessagefromException()//--custom
method to extract message embedded in exception.
as.addActionMessages(message);
//-- above will not work result has already been rendered right? and
hence it wouldn't matter if i add actoinmessages now.
}
}
}
Second approach of of preResultListener is to add action messages just like
above in preResultListener's method as result is yet to be rendered and i can
safely change that. However not sure if preResultListener will ever execute if
exception is thrown in action? and even if it does how i can get the exception
object thrown by the action.?
There has to be something out of the box so that actions are not cluttered with
try-catch blocks
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