I'm making a tomcat 4.0.3 module for netbeans, and I'm running into an odd problem
with the org.apache.catalina.loader.WebappClassLoader.
I'm utilizing the Embedded class to build my server, and I'm using the HostConfig
mechanism for rolling in WAR files. I have no trouble loading individual servlets,
but when I start the server with a WAR file in place, I get a NoClassDefFoundError:
javax/servlet/http/HttpServlet. The error is masked by a catch( Throwable t) clause
in HostConfig::deployApps, but when I explicitly print the stack trace, it looks like:
java.lang.NoClassDefFoundError: javax/servlet/http/HttpServlet
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:493)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:111)
at
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1631)
at
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:926)
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1360)
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1243)
at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:865)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:808)
at
org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3266)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:3395)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:785)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:454)
at org.apache.catalina.core.StandardHost.install(StandardHost.java:723)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:331)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:398)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:232)
at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:156)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1131)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:614)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:343)
at org.apache.catalina.startup.Embedded.start(Embedded.java:957)
at org.netbeans.modules.httpserver.TomcatServer.start(Unknown Source)
at org.netbeans.modules.httpserver.HttpServerModule$1.run(Unknown Source)
Delving into StandardWrapper line 865, I see the classloader attempting to load the
servlet residing in the WAR file. This servlet extends HttpServlet, and that's where
my error is coming from. However, if I stick in a line:
classLoader.loadClass("javax.servlet.http.HttpServlet")
before line 865, everything works fine. I'm guessing this is because HttpServlet gets
loaded in an earlier run of StandardWrapper::loadServlet() (like when the
DefaultServlet gets loaded).
Must I explicitly set the parent classloader for the
org.apache.catalina.loader.WebappLoader? How?
Rich
--
To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]>
For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
