ClassCastException upon redeploy of war but not jar

[mikestephen]

Hi all,

I am running JBoss3.0.0 with Tomcat4.0.3 on Windows.

I have a jar full of ejbs and a war full of jsps/servlets.
They run very happily together until I hot redeploy the
war file. Then if I try to request a jsp page that worked
fine before the redeploy, I get an exception page showing
a ClassCastException :

=====================================================
java.lang.ClassCastException: com.xxx.proxy.ClientProxy
at com.xxx.taglib.GetClientPropTag.doStartTag(GetClientPropTag.java:29)
at org.apache.jsp.index$jsp._jspService(index$jsp.java:124)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:202)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:382)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:474)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
...
=========================================================

The war file references the jar file in its manifest file.

If I redeploy the jar first and then the war, there are no
problems.
I used to have them all in an ear, but would like to be
able to redeploy just the war, as it changes much more
frequently than the jar, and the jar is shared between
a few developers all developing their own wars that
access the ejbs inside it.

Is anyone else able to redeploy successfully using jars
and wars rather than an ear?

Any thoughts would be appreciated.

Cheers,

Mike.

[adrian.brock]

You will probably need to explain a bit more.
I suspect one of your objects loaded from the
jar is still referencing a class/object from the war.

e.g.
The jar instantiates a class from the war using
a class name.
You redeploy the war and the class instance changes.
The war and jar are now holding incompatible versions
of the class.

e.g. 2
The war passes an object to the jar, after the redeploy
the jar still tries to use the old object.

You will get the error when the war tries to
cast the interface or Object back to its new version
of the class.

Regards,
Adrian

[dudoes]

Please recomplile all your .jar and .war, and deploy them again.

[snikolaidis]

Here is an interesting thread:

http://www.jboss.org/modules/bb/index.html?module=bb&op=viewtopic&t=forums/ qjack claims that this problem occurs in windows but not in Linux. Is this true? Do all of us, work on windows?!?!

Oh well.. Now.. where did I put my SuSE 8.0 installation CDz..

[snikolaidis]

Well.. it seems funny but.. there is no problem in Linux! After installling SuSE 8.0, mySQL and JBoss and more that an hour of editting, jar-ing and redeploying, the system works just fine!!!

Plus, I have the one and only feature I really miss in windows: tabbed console window. :)

---
Stratos Nikolaidis
Thessaloniki, Greece