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From Rapthor <rapt...@lycos.de>
Subject 2 webapps using shared jar (ClassLoader problem)
Date Thu, 28 Jun 2007 12:37:55 GMT

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?
-- 
View this message in context: http://www.nabble.com/2-webapps-using-shared-jar-%28ClassLoader-problem%29-tf3994120.html#a11342159
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