In the past I have not done any validation in my ActionForm so I have never
ran across this problem. I read a post from a while back regarding this but
the feedback was fairly obscure. I also read in "Struts In Action" regarding
this problem. But, the solutions were a little vague. So, I am looking for
some creative specificity.
Problem:
I prepopulate some collections in an ActionForm through an Action class
before I display the jsp form. I use the collections that I populate in the
form to create the drop down (<html:options collection="foo">). Upon
submittal of the jsp form and a failed validate in my ActionForm i return
back to the jsp page and my collections are not available/null (of course)
because my form is set in request scope. Following are a few possible
solutions ,that came to mind, for re-populating my collections prior to
being sent back to ActionMapping's input. I am just wondering which is the
best or if there are some better solutions.
1) Specify the form as a session scope - I don't really want to do this
because I am concerned that as the usage volume goes up I am potenially
going to be passing around large complex objects in the session. I prefer to
keep it in the request.
2) Call my logic classes that populate the collections set the values
(setXXX(), getXXX())from within the validate method prior to returning the
ActionErrors. - I am not sure how this would work using Validator. Can I
override validate when extending ValidatorActionForm and call super() to
make sure that the Validator validation is called and then run my logic
classes to repopulate the form?
3) Set my ActionMapping's input to go to the Action url rather than the jsp
(This was a suggestion in "Struts In Action") - I tried this but I get some
looping and ultimately a StackOverflowError. See Following:
java.lang.StackOverflowError
at java.util.HashMap.hash(HashMap.java:257)
at java.util.HashMap.removeEntryForKey(HashMap.java:518)
at java.util.HashMap.remove(HashMap.java:507)
at
org.apache.catalina.core.ApplicationHttpRequest.removeAttribute(ApplicationH
ttpRequest.java:231)
...
at
javax.servlet.ServletRequestWrapper.removeAttribute(ServletRequestWrapper.ja
va:340)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.
java:676)
at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatch
er.java:431)
at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher
.java:355)
at
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:10
33)
at
org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcesso
r.java:269)
at
org.apache.struts.action.RequestProcessor.internalModuleRelativeForward(Requ
estProcessor.java:980)
at
org.apache.struts.tiles.TilesRequestProcessor.internalModuleRelativeForward(
TilesRequestProcessor.java:336)
at
org.apache.struts.action.RequestProcessor.processValidate(RequestProcessor.j
ava:950)
at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:255)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1422)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:523)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
...
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.
java:683)
at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatch
er.java:431)
at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher
.java:355)
at
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:10
33)
at
org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcesso
r.java:269)
at
org.apache.struts.action.RequestProcessor.internalModuleRelativeForward(Requ
estProcessor.java:980)
at
org.apache.struts.tiles.TilesRequestProcessor.internalModuleRelativeForward(
TilesRequestProcessor.java:336)
4) Make sure I have an html representation of the collection in a form -
This idea just seems preposterous.
Thanks ahead of time for the info.
Brandon Goodin
Phase Web and Multimedia
P (406) 862-2245
F (406) 862-0354
[EMAIL PROTECTED]
http://www.phase.ws
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