Hi,
I'm trying to implement an own Loader wraped around the WebappLoader.
My goal is to modify the classloader and to substitute all created
servlets by own proxies.
However, I started creating an own loader and proxying requests to the
WebappLoader but failed :-)
My context.xml contains:
<Context path="/moskitodemo" docBase="${catalina.home}/webapps/moskitodemo"
debug="0" >
<Loader className="net.java.dev.moskito.tomcat.MoskitoLoader"
delegate="false" reloadable="true"/>
</Context>
my loader:
public class MoskitoLoader implements Loader{
private Loader tomcatLoader;
public MoskitoLoader(ClassLoader classLoader){
System.out.println("MINIT: "+classLoader);
tomcatLoader = new WebappLoader(classLoader);
}
I'm proxying the calls to the WebappLoader like this:
public ClassLoader getClassLoader() {
ClassLoader ret = tomcatLoader.getClassLoader();
return ret;
}
However, loading of the application doesn't work. The getClassLoader
method returns null and I have multiple errors in the logfile starting
with:
SEVERE: Error deploying configuration descriptor moskitodemo.xml
java.lang.NullPointerException
at java.util.Hashtable.put(Hashtable.java:401)
at
org.apache.naming.ContextBindings.bindClassLoader(ContextBindings.java:265)
at
org.apache.catalina.core.NamingContextListener.lifecycleEvent(NamingContextListener.java:232)
at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at
org.apache.catalina.core.StandardContext.start(StandardContext.java:4118)
at
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)
at
org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)
at
org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:608)
at
org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:535)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:470)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1112)
at
org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:310)
at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1021)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
at
org.apache.catalina.core.StandardService.start(StandardService.java:450)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:709)
at org.apache.catalina.startup.Catalina.start(Catalina.java:551)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:275)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
I suppose I have to do some more than just instantiate a WebappLoader,
but where can I find what? Any points to docs?
Or do I have to implement all the Lifecycle and proxy it to the WebappLoader?
regards
Leon
P.S. I was trying to do this from the docs without looking into the
sourcecode, if this is a wrong approach please tell :;-)
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