Why I got java.lang.NoClassDefFoundError when using somethin

[seammer]

I use seam2.0GA along with richfaces3.1.2GA.

If I didn't use UITree in my code, everything is alright.
However, if I used something like UITree or TreeState, I got

java.lang.NoClassDefFoundError org/richfaces/******/UITree or TreeState

In the source code, I can import these lib correctly.

The point is :If I didn't use UITree in my code, everything is alright.
However, if I used something like UITree or TreeState, I got the
error.

Has anyone met such problem before?How to solve it?

Thanks in advance.

[appendix]

Hi,

you've probably two versions of richfaces-ui*.jar in your ear package. Just put all richfaces.jars into the lib directory of your ear so they are visible to all the packages within the ear.

Regards, Kurt

[seammer]

Thanks for your reply!
Wish me luck, I will try it out at once, thanks again!

[seammer]

I found the problem was that I was using UITree in Stateful session bean.
When I changed it to Stateless,everything worked well.

[seammer]

"appendix" wrote:
Hi,

you've probably two versions of richfaces-ui*.jar in your ear package. Just put all richfaces.jars into the lib directory of your ear so they are visible to all the packages within the ear.

Regards, Kurt

Nice, your solution works. It has nothing to do with what kind of beans.
Yeah, I have replaced richfaces libs before, but without UITree or alikes everyghing works just fine.

How come I run into such problem?Is there any reason?I have cleaned my project many times before.

Thanks again.