Hi,
      My project requires dynamic replacement of  class file. At runtime we are creating one class file and requires to be replace old class file with new one.
Sugest me way to do this.


Thanks in advance. 

Hi PYadav

  I suggest the class reloading and update detecction settings.  Look this configuration (you have the same in previous versions)

  Class loading and update detection settings
  pic.dhe.ibm.com/infocenter/wasinfo/v8r5/...
 
  Hope this helps.
 
kind regards

Hi Gabriel,
                  Thanks for reply.But in that process server stops for a while.I don't want to stop my server.Without stoping server i want to replace my old class file  with new one like reloding of jsp page.But i am not geting any concrete reference material about jsp page reloding without server restart.

Hi,
    anyone have solution.Please help me.

Hi,
    anyone have solution.Please help me.

Hi,
     Can any one guide me for dynamic class reloading(replacing old .class file with new .class file) in Websphere without restarting server.It is blocker for me to do complete my activity.

Hi PYadav,

I dont think so u can replace old with new class file without restarting the server as we know lot of xml files needs to get updated during the process.

or else go ahead with the option " RolloutUpdate"  if u r in distributed environment.


Correct me if i  am wrong.  Thank you




Cheers.

Hi PYadav

  The only workaround that I know is that Aziz provide in this thread
 
  www.websphereusergroup.org/go/thread/vie...
 
  2) You can clear Websphere temporary (temp/Application Name) folder so that your application jsp and classes are reloaded.  This workaround doesnt need Websphere JVM restart.
 
  or as KASI M suggests a rolloupdate but in this case take in mind that the server is restarted not the application

regards

Hi Gabriel and Kasi,
           Thank you for reply. But i have a doubt, if the class reloading is not possible programatically without restarting the server then how the Jsp page reloading happens without restarting server. Internally jsp also converted into servlet only and then modified class is reloaded by JSpEngine. I am looking for that jsp reloading mechanism but i haven't find concrete reference.



Correct me if i am wrong.
      

PYadav,

  Care, with "Class loading and update detection settings" only the application is restarted NOT the server. With rolloupdate the server is restarted.
 
  If an application is running, changing an application setting causes the application to restart. On stand-alone servers, the application restarts after you save the change. On multiple-server products, the application restarts after you save the change and files synchronize on the node where the application is installed.

 If an application's class definition changes, the application server run time stops and starts the application to reload application classes.
 
  Is diferent to restart an application than a server.
 
regards

Hi Gabriel,
        I am very happy for your quick and explanatory response. Thank You.

        I tried using Class loading and update detection settings.  But it stops the server while reloading of application is in progress. I will explain about my requirement correctly.
               I am working on a Web project. In our project, we are executing some task after some condition results in true. But  we are taking that condition(Java if block and we are calling that as RULE) from some configuration file that is editable by admin. so admin can edit that and update it back. And we are taking that RULE from file and construct a new class file. And now we have to update class file. And we can not afford to restart server each time whenever admin updates the RULE.Class loading and update detection settings stops the server for a while.

               In java code we can update class file directly using hot swap mechanism ( docs.oracle.com/javase/1.4.2/docs/guide/... )but that's not working in WebSphere.

Regards,
Prakash
 

PYadav,

  Which version of WAS do you have?

  Thanks.

regards

PYadav,

  look the next links please
 
    Ways to update application files
    pic.dhe.ibm.com/infocenter/wasinfo/v6r1/...
    
    Managing applications through programming
    http://pic.dhe.ibm.com/infocenter/wasinfo/v6r1/topic/com.ibm.websphere.nd.multiplatform.doc/info/ae/ae/tjmx_updating_app.html

    IBM WebSphere Developer Technical Journal: System management for WebSphere Application Server V6 -- Part 5
    Flexible options for updating deployed applications
    http://www.ibm.com/developerworks/websphere/techjournal/0510_apte/0510_apte.html

  Hope this helps.
 
regards

Hi Gabriel,
       I am using WebSphere7.0 

PYadav

  The links are valid to WAS 7 too
 
  Ways to update application files
  pic.dhe.ibm.com/infocenter/wasinfo/v7r0/...
 
  Managing applications through programming
  pic.dhe.ibm.com/infocenter/wasinfo/v7r0/...
 
  and from WAS 7 infocenter...
 
  If the application is updated while it is running, WebSphere Application Server automatically stops the application, updates the application logic and restarts the application. If the application does not start automatically, start it manually using one of the Starting options. For more information on the restarting of updated applications, refer to "Fine-grained recycle behavior" in IBM® WebSphere Developer Technical Journal: System management for WebSphere Application Server Version 6.0 -- Part 5 Flexible options for updating deployed applications.
 
   IBM WebSphere Developer Technical Journal: System management for WebSphere Application Server V6 -- Part 5
    Flexible options for updating deployed applications
    www.ibm.com/developerworks/websphere/tec...
    
regards

Hi,

Can u try using "Polling interval for updated files" option under Enterprise Application>"Application Name" > Class loader ?

Please make sure you check "Override class reloading settings for Web and EJB modules" Check Box to use the same..


Class reloading options

Override class reloading settings for Web and EJB modules

Polling interval for updated files  Seconds

Polling interval for updated files

Hi

This is the first Time i have come across  the term "polling interval for updates files" in your above post. Can anyone plz let me know what it does mean.   Thank you.



Cheers.