DispatcherServlet cannot find classes when its used in a Bundle

[hasTom]

Hi everyone,

I have a tricky problem. For some reasons I need to run an OSGi Container inside a web container (eg. Tomcat) for which I use the equinox servlet bridge. As I want to expose a service Interface over http, I use the HttpServiceExporter that exposes a service on the class "ModelFacade". I managed to register the DispatcherServlet (that I need for the remoting) from inside OSGi and let it read the spring configuration xml file. I did that like this:

ServiceReference httpReference = context.getServiceReference(HttpService.class.getName());
HttpService service = (HttpService) context.getService(httpReference);
		
DispatcherServlet servlet = new DispatcherServlet();
servlet.setContextConfigLocation("META-INF/dispatcherservlet.xml");
service.registerServlet("/remote", servlet, null, null);

The dispatcherservlet.xml file is this:

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:util="http://www.springframework.org/schema/util"
	xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:lang="http://www.springframework.org/schema/lang"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
                           http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd
                           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd
                           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
                           http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.0.xsd
                           http://www.springframework.org/schema/osgi http://www.springframework.org/schema/osgi/spring-osgi.xsd">


	
	<bean name="modelFacade" class="com.tp.model.ModelFacade" scope="session">
	</bean>

	<bean name="/ModelFacade" id="modelFacadeHTTPExporter"
		class="org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter"
		scope="session" >
		<property name="service" ref="modelFacade" />
		<property name="serviceInterface" value="com.tp.model.remote.IModelFacade" />
	</bean>
 </beans>

I can see on the OSGi console that the servlet is able to find the configuration and loads it, now claiming that it cannot find the classes (ModelFacade) in my bundle (in which the configuration file lies, too).
It seems that the classloader the dispatcher servlet uses cannot see the classes in the bundle.

Here's the Tomcat-log showing the exception:

13.05.2009 16:56:30 org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not fou nd on the java.library.path: C:\Programme\Java\jdk1.6.0_11\bin;.;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;
C:\Programme\Java\jdk1.6.0_11\bin;N:\COMP\PVCS\VM\win32\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\P
rogramme\TortoiseSVN\bin;C:\Programme\apache-maven-2.1.0\bin
13.05.2009 16:56:30 org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
13.05.2009 16:56:30 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 451 ms
13.05.2009 16:56:30 org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
13.05.2009 16:56:30 org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.18
13.05.2009 16:56:30 org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive bridge.war Listening on port 9999 ...
13.05.2009 16:56:33 org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
13.05.2009 16:56:33 org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
13.05.2009 16:56:33 org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/31  config=null
13.05.2009 16:56:33 org.apache.catalina.startup.Catalina start
INFO: Server startup in 3074 ms
0    [OSGi Console] INFO  org.springframework.osgi.extender.internal.activator.ContextLoaderListener  - Starting [org.sp
ringframework.osgi.extender] bundle v.[1.2.0]
        94   [OSGi Console] INFO  org.springframework.osgi.extender.internal.support.ExtenderConfiguration  - No custom
extender configuration detected; using defaults...
        94   [OSGi Console] INFO  org.springframework.scheduling.timer.TimerTaskExecutor  - Initializing Timer
        4358 [OSGi Console] INFO  org.springframework.web.servlet.DispatcherServlet  - FrameworkServlet 'org.springframe
work.web.servlet.DispatcherServlet': initialization started
        4358 [OSGi Console] INFO  org.springframework.web.context.support.XmlWebApplicationContext  - Refreshing org.spr
ingframework.web.context.support.XmlWebApplicationContext@97d026: display name [WebApplicationContext for namespace 'org .springframework.web.servlet.DispatcherServlet-servlet']; startup date [Wed May 13 16:56:42 CEST 2009]; root of context hierarchy
        4405 [OSGi Console] INFO  org.springframework.beans.factory.xml.XmlBeanDefinitionReader  - Loading XML bean defi nitions from ServletContext resource [/META-INF/dispatcherservlet.xml]
        5467 [OSGi Console] INFO  org.springframework.web.context.support.XmlWebApplicationContext  - Bean factory for a pplication context [org.springframework.web.context.support.XmlWebApplicationContext@97d026]: org.springframework.beans.
factory.support.DefaultListableBeanFactory@1ab2b55
        5482 [OSGi Console] INFO  org.springframework.beans.factory.support.DefaultListableBeanFactory  - Pre-instantiat ing singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1ab2b55: defining beans [modelFac ade,modelFacadeHTTPExporter]; root of factory hierarchy
        5498 [OSGi Console] INFO  org.springframework.beans.factory.support.DefaultListableBeanFactory  - Destroying sin gletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1ab2b55: defining beans [modelFacade,mod elFacadeHTTPExporter]; root of factory hierarchy
        5498 [OSGi Console] ERROR org.springframework.web.servlet.DispatcherServlet  - Context initialization failed
        org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.
servlet.handler.BeanNameUrlHandlerMapping': Initialization of bean failed; nested exception is org.springframework.beans
.factory.CannotLoadBeanClassException: Cannot find class [com.tp.model.ModelFacade] for bean with name 'modelFacade' def ined in ServletContext resource [/META-INF/dispatcherservlet.xml]; nested exception is java.lang.ClassNotFoundException:
 com.tp.model.ModelFacade
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCap
ableBeanFactory.java:480)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBea
nFactory.java:409)
        at java.security.AccessController.doPrivileged(Native Method)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapab
leBeanFactory.java:380)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapab
leBeanFactory.java:255)
        at org.springframework.web.servlet.DispatcherServlet.createDefaultStrategy(DispatcherServlet.java:770)
        at 
...

Any ideas?