AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Out of Memory Error -- WebSphere Application Server 4.x          AppletTalk.com Forum Index -> Java Software Tools View previous topic :: View next topic   Author Message Danda Guest Posted: Thu Apr 21, 2005 4:36 pm    Post subject: Out of Memory Error -- WebSphere Application Server 4.x Hi We are using WebSphere Application server on Sun solaris box as a development application server. As a part of the development, we frequently FTP the java class files to the application server. When we do this, we noticed that the sessions of the users who are already logged in the application running on that WAS are getting lost. They have to reenter the credentials again to navigate through the application. As the day work goes on, after certain number of class files are uploaded onto the server by FTP, the application server is throwing Out of Memory error and coming to a halt. When we try to access the url it throws the OutOfMemory error in the logs. This is hampering our development work, as we have to restart the development server atleast twice in a day. Our assumption is that, whenever we do a class fild upload all the sesssions on the server are getting lost and new objects/ sessions are created. Before the garbage collector runs, the frequent upload of class files are causing to create more and more objects. Please suggest or advise a workaround or solution for this. Regards Danda Back to top Robert Klemme Guest Posted: Mon Apr 25, 2005 5:20 pm    Post subject: Re: Out of Memory Error -- WebSphere Application Server 4.x "Danda" <ravindrakumar.danda (AT) cognizant (DOT) com> schrieb im Newsbeitrag news:7e3ac6e3.0504210836.ea74eb0 (AT) posting (DOT) google.com... Quote: Hi We are using WebSphere Application server on Sun solaris box as a development application server. As a part of the development, we frequently FTP the java class files to the application server. When we do this, we noticed that the sessions of the users who are already logged in the application running on that WAS are getting lost. They have to reenter the credentials again to navigate through the application. As the day work goes on, after certain number of class files are uploaded onto the server by FTP, the application server is throwing Out of Memory error and coming to a halt. When we try to access the url it throws the OutOfMemory error in the logs. This is hampering our development work, as we have to restart the development server atleast twice in a day. Our assumption is that, whenever we do a class fild upload all the sesssions on the server are getting lost and new objects/ sessions are created. Before the garbage collector runs, the frequent upload of class files are causing to create more and more objects. Please suggest or advise a workaround or solution for this. There might be issues with old class versions that cannot be GC'ed because objects in sessions still refer them. Several things come to mind: - increase mem of the VM - don't put so much data in sessions - decrease the lifetime of a session so it gets destroyed faster - make sure, your app doesn't leak - it could well be a completely unlrelated issue. Do you get the error even if you don't upload new classes after testing some while? Regards robert Back to top Danda Guest Posted: Wed Apr 27, 2005 6:59 am    Post subject: Re: Out of Memory Error -- WebSphere Application Server 4.x "Robert Klemme" <bob.news (AT) gmx (DOT) net> wrote Quote: "Danda" <ravindrakumar.danda (AT) cognizant (DOT) com> schrieb im Newsbeitrag news:7e3ac6e3.0504210836.ea74eb0 (AT) posting (DOT) google.com... Hi We are using WebSphere Application server on Sun solaris box as a development application server. As a part of the development, we frequently FTP the java class files to the application server. When we do this, we noticed that the sessions of the users who are already logged in the application running on that WAS are getting lost. They have to reenter the credentials again to navigate through the application. As the day work goes on, after certain number of class files are uploaded onto the server by FTP, the application server is throwing Out of Memory error and coming to a halt. When we try to access the url it throws the OutOfMemory error in the logs. This is hampering our development work, as we have to restart the development server atleast twice in a day. Our assumption is that, whenever we do a class fild upload all the sesssions on the server are getting lost and new objects/ sessions are created. Before the garbage collector runs, the frequent upload of class files are causing to create more and more objects. Please suggest or advise a workaround or solution for this. There might be issues with old class versions that cannot be GC'ed because objects in sessions still refer them. Several things come to mind: - increase mem of the VM - don't put so much data in sessions - decrease the lifetime of a session so it gets destroyed faster - make sure, your app doesn't leak - it could well be a completely unlrelated issue. Do you get the error even if you don't upload new classes after testing some while? Regards robert Hi Robert.. Hi Robert Thanks a lot for Your quick reply. The problem goes liek this. We have the development server in a different place and we do a normal FTP of class files to the development box after modification. We observed that while other users are logged in through the web application GUI, we do a normal class file upload onto the application server. So, the users' sessions are getting lost and teh application is throwing the login screen for them. And if we do some certain no of class file uploads to the applicatino server as the users are logged in, the GUI is becoming not accessible as the server throws the Out Of Memory Error in the logs and Error 500 or blank screen for the users.We cant question on server configuration bcoz it used to run fine. And also there is not much data kept in the sessions. We are using Web Sphere Application server 4.x. Mean while I would like to confirm whether 4.x supports dymanic deployment and hot deployment. 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