Where do you have your c3p0 and hibernate jars located on the server?  The problem reads like a class loader issue.



On 4/30/08, Joćo Paulo Mafra <jpmneofito@gmail.com> wrote:
Hi,

My name is Joćo Paulo, I'm a brazilliam developer. I'm working in a
web application to tune its performance, and one of the tasks I've
performed were to use a connection properly (the app uses hibernate).
When several web app's run in a single tomcat, the following error
happens:

java.lang.NoClassDefFoundError:
  com/mchange/v2/resourcepool/BasicResourcePool$5
        com.mchange.v2.resourcepool.BasicResourcePool.destroyResource(BasicResourcePool.java:572)
        com.mchange.v2.resourcepool.BasicResourcePool.removeResource(BasicResourcePool.java:902)
        com.mchange.v2.resourcepool.BasicResourcePool.removeResource(BasicResourcePool.java:896)
        com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:231)
        com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:209)
        com.mchange.v2.c3p0.PoolBackedDataSource.getConnection(PoolBackedDataSource.java:64)
        org.hibernate.connection.C3P0ConnectionProvider.getConnection(C3P0ConnectionProvider.java:35)
        org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:298)
        org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:110)
        org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:137)
        org.hibernate.impl.SessionImpl.connection(SessionImpl.java:345)
        br.com.vetorweb.EntryPoint.getParametroscliente(EntryPoint.java:139)
        br.com.vetorweb.EntryPoint.getParametroscliente(EntryPoint.java:128)
        br.com.vetorweb.security.SecurityFilter.doFilter(SecurityFilter.java:50)
        br.com.vetorweb.pool.PoolFilter.doFilter(PoolFilter.java:106)

The app uses hibernate 3.0.5 and c3p0 0.8.5.2.

I've searched in google about the error above, but I found few
results. One I think that may be the same of mine is described in:
   http://forum.hibernate.org/viewtopic.php?t=924774
but no solution is mentioned.

Has someone some helpful information about this error?


Thanks... sorry my bad english... :'(

Joćo Paulo

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