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Posted to users@tomcat.apache.org by Kevin Wilhelm <Ke...@gmx.net> on 2007/06/28 14:34:51 UTC
2 webapps using shared jar (ClassLoader problem)
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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RE: 2 webapps using shared jar (ClassLoader problem)
Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: Kevin Wilhelm [mailto:kevinwilhelm@gmx.net]
> Subject: Re: 2 webapps using shared jar (ClassLoader problem)
>
> Nobody any idea on this? :(
You already figured out the problem: classes from different webapps
cannot access each other - no ifs, ands, or buts. Anything that is to
be accessed from more than one webapp must be put in a common location.
See:
http://tomcat.apache.org/tomcat-6.0-doc/class-loader-howto.html
or
http://tomcat.apache.org/tomcat-5.5-doc/class-loader-howto.html
(You didn't bother to tell us the version of Tomcat that you're using.)
- Chuck
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Re: 2 webapps using shared jar (ClassLoader problem)
Posted by Kevin Wilhelm <ke...@gmx.net>.
Nobody any idea on this? :(
----- Original Message -----
From: "Kevin Wilhelm" <Ke...@gmx.net>
To: <us...@tomcat.apache.org>
Sent: Thursday, June 28, 2007 2:34 PM
Subject: 2 webapps using shared jar (ClassLoader problem)
>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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