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Posted to users@tapestry.apache.org by Colin Sampaleanu <co...@exis.com> on 2004/02/23 04:27:50 UTC

On WebApp load/reload, NoClassDefFoundError for org/apache/tapestry/IResourceResolver

I'm curious if anybody's seen this. I was running Tapestry post beta 3, 
inside a webapp inside an ear, with no issues, including reloading on 
hot redeploying the app, running inside JBoss (TomCat version).

Around the same time, I switched to beta 4, and added Tapestry to 
another webapp inside the ear. Now, about 2/3 of the time when I deploy 
or redeploy (doesn't seem to make a difference), I get the following 
error on startup of the webapps:

java.lang.NoClassDefFoundError: org/apache/tapestry/IResourceResolver
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Class.java:1610)
    at java.lang.Class.getConstructor0(Class.java:1922)
    at java.lang.Class.newInstance0(Class.java:278)
    at java.lang.Class.newInstance(Class.java:261)
    at 
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:903)
...

and if I try to hit the tapestry app, it tells me that the servlet is 
not available...

Has anybody seen something like this?  I think it's probably some sort 
of race condition related to classloading, given that it works about 1/3 
- 1/2 the time, while failing the rest of the time, on a pretty random 
basis. Very annoying.

Regards,
Colin



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Re: On WebApp load/reload, NoClassDefFoundError for org/apache/tapestry/IResourceResolver

Posted by Colin Sampaleanu <co...@exis.com>.
Erik Hatcher wrote:

>
> On Feb 22, 2004, at 10:27 PM, Colin Sampaleanu wrote:
>
>> Around the same time, I switched to beta 4, and added Tapestry to 
>> another webapp inside the ear. Now, about 2/3 of the time when I 
>> deploy or redeploy (doesn't seem to make a difference), I get the 
>> following error on startup of the webapps:
>
>
> We use multiple Tapestry WAR's within a single EAR within JRun 
> successfully.  I've not seen this type of error before.
>
>> Has anybody seen something like this?  I think it's probably some 
>> sort of race condition related to classloading, given that it works 
>> about 1/3 - 1/2 the time, while failing the rest of the time, on a 
>> pretty random basis. Very annoying.
>
>
> Ah the joys of JBoss and classloading: 
> http://members.capmac.org/~orb/blog.cgi/tech/java/ucl_bitten.html

Tell me about it. You have _no_ idea how much (mental) pain I have 
suffered in the last couple of years due to JBoss classloading bugs. -- 
Actually, I see I'm mentioned in that link. The hilarious thing is that 
the JBoss folks always seem to tout that classloader as a good feature...

Regards,
Colin




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Re: On WebApp load/reload, NoClassDefFoundError for org/apache/tapestry/IResourceResolver

Posted by Erik Hatcher <er...@ehatchersolutions.com>.
On Feb 22, 2004, at 10:27 PM, Colin Sampaleanu wrote:
> Around the same time, I switched to beta 4, and added Tapestry to 
> another webapp inside the ear. Now, about 2/3 of the time when I 
> deploy or redeploy (doesn't seem to make a difference), I get the 
> following error on startup of the webapps:

We use multiple Tapestry WAR's within a single EAR within JRun 
successfully.  I've not seen this type of error before.

> Has anybody seen something like this?  I think it's probably some sort 
> of race condition related to classloading, given that it works about 
> 1/3 - 1/2 the time, while failing the rest of the time, on a pretty 
> random basis. Very annoying.

Ah the joys of JBoss and classloading: 
http://members.capmac.org/~orb/blog.cgi/tech/java/ucl_bitten.html

	Erik


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