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From "Jason Beck" <jason.s.b...@gmail.com>
Subject Context fails to load with Filter
Date Tue, 09 May 2006 16:02:56 GMT
Hello list,

I have written my first filter and think that I have it right, but when I
try to start Tomcat 5.5.9 after applying the necessary configuration changes
to web.xml, the Context that the Filter is in fails to start.   Perhaps
someone can tell me what I may have done wrong.

<-- web.xml -->
   <filter>
      <filter-name>AuthenticateFilter</filter-name>
      <filter-class>com.affinity.tasc.filters.AuthenticateFilter
</filter-class>
   </filter>
   <filter-mapping>
      <filter-name>AuthenticateFilter</filter-name>
      <servlet-name>Index</servlet-name>
   </filter-mapping>

   <servlet>
      <servlet-name>Index</servlet-name>
      <servlet-class>com.affinity.tasc.core.Index</servlet-class>
   </servlet>
   <servlet-mapping>
      <servlet-name>Index</servlet-name>
      <url-pattern>/Index</url-pattern>
   </servlet-mapping>

<-- end web.xml -->

<-- Filter code -->

package com.affinity.tasc.filters;

import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.*;
import com.affinity.tasc.beans.SiteUserBean;

public abstract class AuthenticateFilter implements Filter {

        private FilterConfig fc;

        public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain)
                throws IOException, ServletException {

                /* Make sure we are dealing with HTTP */
                if (req instanceof HttpServletRequest) {
                        HttpServletRequest request =
(HttpServletRequest)req;
                        HttpServletResponse response =
(HttpServletResponse)res;

                        HttpSession session = request.getSession(false);

                        if (request.getParameter("Authenticate").equals("1"))
{

                                try {
                                        SiteUserBean user = new
SiteUserBean();
                                        user.setUsername(
request.getParameter("username"));
                                        user.setPassword(
request.getParameter("password"));

                                        int authed = user.getUserAuthed();

                                        /* Successful authentication */
                                        if (authed > 0) {
                                                session.setAttribute("user",
user);
                                        }

                                        session.setAttribute("authed",
authed);

                                } catch (NullPointerException nx) {
                                        nx.printStackTrace();
                                } catch (Exception ex) {
                                        ex.printStackTrace();
                                }
                        }
                }

                /* Continue filtering */
                chain.doFilter(req, res);
        }

        public void init(FilterConfig filterConfig) throws ServletException
{
                this.fc = filterConfig;
        }

        public void destroy() {
                this.fc = null;
        }
}

<-- end filter code -->

Here is the output from catalina.out when I try to start tomcat with this
filter installed...

May 9, 2006 11:46:31 AM org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
May 9, 2006 11:46:31 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 1270 ms
May 9, 2006 11:46:32 AM org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
May 9, 2006 11:46:32 AM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/5.5.9
May 9, 2006 11:46:32 AM org.apache.catalina.core.StandardHost start
INFO: XML validation disabled
May 9, 2006 11:46:32 AM org.apache.catalina.core.StandardContext filterStart
SEVERE: Exception starting filter AuthenticateFilter
java.lang.InstantiationException
        at
sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(
InstantiationExceptionConstructorAccessorImpl.java:30)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
        at java.lang.Class.newInstance0(Class.java:350)
        at java.lang.Class.newInstance(Class.java:303)
        at org.apache.catalina.core.ApplicationFilterConfig.getFilter(
ApplicationFilterConfig.java:212)
        at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(
ApplicationFilterConfig.java:308)
        at org.apache.catalina.core.ApplicationFilterConfig.<init>(
ApplicationFilterConfig.java:79)
        at org.apache.catalina.core.StandardContext.filterStart(
StandardContext.java:3540)
        at org.apache.catalina.core.StandardContext.start(
StandardContext.java:4110)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java
:1012)
        at org.apache.catalina.core.StandardHost.start(StandardHost.java
:718)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java
:1012)
        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
:683)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:537)
        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:271)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409)
May 9, 2006 11:46:32 AM org.apache.catalina.core.StandardContext start
SEVERE: Error filterStart
May 9, 2006 11:46:32 AM org.apache.catalina.core.StandardContext start
SEVERE: Context [/TASC] startup failed due to previous errors
May 9, 2006 11:46:33 AM org.apache.catalina.core.ApplicationContext log
INFO: org.apache.webapp.balancer.BalancerFilter: init(): ruleChain: [
org.apache.webapp.balancer.RuleChain: [
org.apache.webapp.balancer.rules.URLStringMatchRule: Target string: News /
Redirect URL: http://www.cnn.com], [
org.apache.webapp.balancer.rules.RequestParameterRule: Target param name:
paramName / Target param value: paramValue / Redirect URL:
http://www.yahoo.com], [
org.apache.webapp.balancer.rules.AcceptEverythingRule: Redirect URL:
http://jakarta.apache.org]]
May 9, 2006 11:46:33 AM org.apache.catalina.loader.WebappClassLoaderloadClass
INFO: Illegal access: this web application instance has been stopped
already.  Could not load org.apache.xerces.impl.dtd.DTDGrammar.  The
eventual following stack trace is caused by an error thrown for debugging
purposes as well as to attempt to terminate the thread which caused the
illegal access, and has no functional impact.
May 9, 2006 11:46:33 AM org.apache.commons.modeler.RegistryregisterComponent
SEVERE: Null component Catalina:type=JspMonitor,name=jsp,WebModule=//sa-
test.valueweb.net/servlets-examples,J2EEApplication=none,J2EEServer=none
May 9, 2006 11:46:33 AM org.apache.catalina.startup.HostConfigdeployDirectory
SEVERE: Error deploying web application directory servlets-examples
java.lang.ThreadDeath
        at org.apache.catalina.loader.WebappClassLoader.loadClass(
WebappClassLoader.java:1221)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(
WebappClassLoader.java:1181)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
        at org.apache.xerces.impl.dtd.XMLDTDValidator.doctypeDecl(Unknown
Source)
        at org.apache.xerces.impl.XMLDocumentScannerImpl.scanDoctypeDecl(Unknown
Source)
        at
org.apache.xerces.impl.XMLDocumentScannerImpl$PrologDispatcher.dispatch(Unknown
Source)
        at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown
Source)
        at org.apache.tomcat.util.digester.Digester.parse(Digester.java
:1561)
        at org.apache.catalina.startup.ContextConfig.applicationWebConfig(
ContextConfig.java:339)
        at org.apache.catalina.startup.ContextConfig.start(
ContextConfig.java:1031)
        at org.apache.catalina.startup.ContextConfig.lifecycleEvent(
ContextConfig.java:255)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(
LifecycleSupport.java:119)
        at org.apache.catalina.core.StandardContext.start(
StandardContext.java:4053)
        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.deployDirectory(
HostConfig.java:894)
        at org.apache.catalina.startup.HostConfig.deployDirectories(
HostConfig.java:857)
        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java
:475)
        at org.apache.catalina.startup.HostConfig.start(HostConfig.java
:1102)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(
HostConfig.java:311)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(
LifecycleSupport.java:119)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java
:1020)
        at org.apache.catalina.core.StandardHost.start(StandardHost.java
:718)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java
:1012)
        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
:683)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:537)
        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:271)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409)
May 9, 2006 11:46:33 AM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
May 9, 2006 11:46:33 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
May 9, 2006 11:46:34 AM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
May 9, 2006 11:46:34 AM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
May 9, 2006 11:46:34 AM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/25  config=null
May 9, 2006 11:46:34 AM org.apache.catalina.storeconfig.StoreLoader load
INFO: Find registry server-registry.xml at classpath resource
May 9, 2006 11:46:34 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 2637 ms

thanks for your help.

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