Migrating from websphere 4 to 6

[jagmohan bisht]

I am using j2ee1.2 so what changes I have to make while Migrating..?

[Oggi Olli]

Websphere is a suite of many products, and it is kind of hard to know which one you are talking about since you only mentioned the version number.

If you provide us with more information it will be easier to help you out. I.e the environment you are using currently (application server and developer) and which ones you want to migrate to.

By the way, J2EE migration from 1.2 to 1.4 could be accomplished with a migration wizard in Rational Application Developer. However some steps like migrating webservices or ejb's to a higher level have to be done manually.

[by the way, I noticed you had made 3 posts on this topic. Try and read the FAQ. Maybe you will get some more (and better) answers if you do.]
[ January 25, 2008: Message edited by: Steinar Steinnes ]

[jagmohan bisht]

Thanks for the Reply.

Actually I want to migrate my J2EE application from WebSphere Application Server 4 To WAS 6 ... and want to know what types of changes i have to made in my application in order to make it work fine.

[Oggi Olli]

Well, you need to migrate your server from 4.x to 6.x, meaning that all your 4.x settings is replicated on the 6.x server. There is some documents regarding that issue here. Look under WAS 6 - migration guide.

Then, you would have to migrate your code. It depends on what your development environment is, but like I said, for instance you could use the migration wizard in RAD or RSA and test it with the built in WAS 6 test environment. There is also some forums dedicated to migration over at developerWorks. This is not a trivial task, especially if your code is very old. But you have to start somewhere and IBM's help pages is a good place to start. You will have to expect a lot of reading, searching, trial and error in order to complete such a task.

[Brian Stelzer]

As previously noted this is not going to be a trivial task. I've included a link to the WebSphere Application Server Migration planning website: http://www-1.ibm.com/support/docview.wss?rs=180&uid=swg27008724

This site is a compilation of all Migration articles we found to be useful. I would suggest you first go through .pdf located on the main planning page. The .pdf contains all issues that "we are aware of" for your specific migration scenario.

[Oggi Olli]

Thanks Brian

I wasn't aware of that page. That document will be useful for me as well, as I'm planning to upgrade a server within the next few months.

[vamsheedhar devarishati]

Recently we updated was5.1 to was6.0 around 15 projects.

I found lot of issues with respet to Back end , front end , Webservices and EJB. I am listing some . please keep post me your problems may be i can help you in future.

1 ) One phase and 2 phase commit :: From was6.0 onwards it is not ok to participate a one phase comit resourse in a transaction.The resource must be XA enabled.

2 ) Webservice END point URL in adminconsole and Service loactor class must match including protocol. (http or https ) if you use http in service locator class and https in admin console was6.0 won"t allow where as was4.and was5 will allow.

3 )All xml files must me formatted according to J2ee standards ..which is ok in was5.1