Carlin, Please find the link which describes the problem we are having : http://support.bea.com/application_content/product_portlets/support_patterns /wlw/NullPointerExceptionOnControlInstancePattern.html
-----Original Message----- From: Kunnath, Radjhakrishnan [HCSUS Non-J&J] Sent: Wednesday, April 04, 2007 12:12 PM To: 'Carlin Rogers' Subject: RE: NullPointerException on Controls Carlin, I am so bogged down with lot of stuff and I could get back to you. I was wondering you know who can consult with us for a week to fix this probelm and who can start ASAP. Thanks, RK -----Original Message----- From: Carlin Rogers [mailto:[EMAIL PROTECTED] Sent: Thursday, March 29, 2007 4:24 PM To: Kunnath, Radjhakrishnan [HCSUS Non-J&J] Subject: Re: NullPointerException on Controls Thanks RK. I appreciate you taking the time to create the sample app. That will really help. Kind regards, Carlin On 3/29/07, Kunnath, Radjhakrishnan [HCSUS Non-J&J] <[EMAIL PROTECTED]> wrote: > > > > Yes. I have HttpSessionMutexListener registered as a <listener> in the > web.xml. > > It will take a while for me to send the sample app. I will send it as soon > as I can. > > > Thank you so much, > RK > > -----Original Message----- > From: Carlin Rogers [mailto:[EMAIL PROTECTED] > Sent: Thursday, March 29, 2007 1:50 PM > To: Kunnath, Radjhakrishnan [HCSUS Non-J&J] > Cc: [EMAIL PROTECTED] > Subject: Re: NullPointerException on Controls > > > > > Do you have the HttpSessionMutexListener registered as a <listener> in > your web.xml? > > The only thought is that there is a race condition that we haven't > handled... where the page flow controller is being invalidated/removed > in one request while another request for the page flow controller is > in process. If you could make an app similar to yours that I could use > to repro this case, that would be helpful. Just send it to me. > > Kind regards, > Carlin > > > On 3/27/07, Kunnath, Radjhakrishnan [HCSUS Non-J&J] > <[EMAIL PROTECTED]> wrote: > > > > > > > > We were able to reproduce the NPE. The users click a link and they do not > > wait for the response to be completed. They click another link and then > they > > go back to the same first link and click again. This produces the NPE. > > > > Any thoughts ? > > > > > > -RK > > > > -----Original Message----- > > From: Carlin Rogers [mailto:[EMAIL PROTECTED] > > Sent: Thursday, March 22, 2007 6:26 PM > > To: Kunnath, Radjhakrishnan [HCSUS Non-J&J] > > Cc: [EMAIL PROTECTED] > > Subject: Re: NullPointerException on Controls > > > > > > Forgot to copy the user list... > > > > On 3/22/07, Carlin Rogers <[EMAIL PROTECTED]> wrote: > > > It would be great to get a consistent reproduction. My first guess > > > would be that somehow the session is being invalidated before the call > > > to the control in the action. PageFlowController implements > > > HttpSessionBindingListener so that it gets a valueUnbound() event from > > > the container when a session is being invalidated. This allows the > > > page flow controller class to clean up any resources, including > > > controls. > > > > > > Another thought would be an issue with inheritance that was recently > > > fixed in 1.0.2. > > > Are you using inheritance for your page flows? If so, do any of the > > > base class page flow controllers contain controls? See... > > > > > > http://issues.apache.org/jira/browse/BEEHIVE-1060 > > > > > > Carlin > > > > > > On 3/22/07, Kunnath, Radjhakrishnan [HCSUS Non-J&J] > > > <[EMAIL PROTECTED]> wrote: > > > > > > > > > > > > > > > > Carlin, > > > > > > > > Thanks for your response. Before I answer your questions, this is the > > > > environment we are using > > > > 1. IDE is workshop for weblogic > > > > 2. Beehive framework ver is 1.0 > > > > 3. weblogic server 9.2 deployed in Unix box. > > > > > > > > Answers to you question: > > > > > > > > > > > > 1. No. we do not have any other exception before this exception. > > > > 2. We tested it manually. We did not use any s/w. I assume the > user > > > > sessions will be unique. > > > > 3. Session invalidation is done during the log off process. > > > > 4. In this case, the ViewController calls a page which as a > iframe > > and > > > > the webpage with in the iframe uses their own Page flow controllers. > In > > some > > > > cases calls to controls are made and in some other cases it is not. > > > > > > > > The log trace I sent is just one instance of it. There are multiple > > > > instances of calls to controls, especially, JDBC controls and Control > > > > implementation , throws NPE sporadically and cannot be reproduced > > > > consistently. > > > > > > > > Any help would be really appreciated. > > > > > > > > Thanks, > > > > RK > > > > > > > > > > > > > > > > > > >
