2 webapps using shared jar (ClassLoader problem)

[Kevin Wilhelm]

I deployed a shared jar file on Tomcat that is to be used by two Spring 
webapps. The problem is the Exception I receive when trying to access the 
shared library by the second webapp. The first one already set some properties 
within the shared class instances.

The Exception:

java.lang.IllegalArgumentException: interface 
org.hibernate.jdbc.ConnectionWrapper is not visible from class loader 
   java.lang.reflect.Proxy.getProxyClass(Proxy.java:353) 
   java.lang.reflect.Proxy.newProxyInstance(Proxy.java:581) 
   
org.hibernate.jdbc.BorrowedConnectionProxy.generateProxy(BorrowedConnectionProxy.java:67)
 
   
org.hibernate.jdbc.ConnectionManager.borrowConnection(ConnectionManager.java:163)
 
   org.hibernate.jdbc.JDBCContext.borrowConnection(JDBCContext.java:111) 
   org.hibernate.impl.SessionImpl.connection(SessionImpl.java:359) 
   
org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:456)
 
   
org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:349)
 
   
org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:259)
 
   
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:102)
 
   
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:161)
 
   
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:203)
 
   $Proxy2.create(Unknown Source) 
   test.TestController.handleRequest(TestController.java:39) 
   
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
 
   
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:839)
 
   
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:774)
 
   
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:460)
 
   
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:415)
 
   javax.servlet.http.HttpServlet.service(HttpServlet.java:690) 
   javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

The interface from Hibernate is in the hibernate3.jar file of the first webapp.

I tried to do something that seemed to be a workaround. Something to do with 
the ClassLoaders not being able to see each others classes?! I extended 
Spring's ContextListeners and replaced the original ones for startup (for both 
webapps):

public class MySpringContextListener extends 
org.spring....ContextLoaderListener {

        @Override
        public void contextInitialized(ServletContextEvent evt) {
                ClassLoader contextLoader = 
Thread.currentThread().getContextClassLoader(); 
                
Thread.currentThread().setContextClassLoader(getClass().getClassLoader()); 
                super.contextInitialized(evt); 
                Thread.currentThread().setContextClassLoader(contextLoader);    
        }
        
        @Override
        public void contextDestroyed(ServletContextEvent evt) {
                
                ClassLoader contextLoader = 
Thread.currentThread().getContextClassLoader(); 
                
Thread.currentThread().setContextClassLoader(getClass().getClassLoader()); 
                super.contextDestroyed(evt); 
                
evt.getServletContext().removeAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);
 
                Thread.currentThread().setContextClassLoader(contextLoader);
        }
}

But the exception remains 

Can you help me, please?

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