Servlet filter web.xml - class exception not found
I am having a problem setting up a filter - the filter I have defined in web.xml looks like this:
<filter>
<filter-name>Log</filter-name>
<filter-class>test.log</filter-class>
</filter>
<filter-mapping>
<filter-name>Log</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
But I am getting the following error:
SEVERE: Exception starting filter Log
java.lang.ClassNotFoundException: test.log
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1711)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1556)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:532)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:514)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:133)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:256)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:382)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:103)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4650)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5306)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
I have a specific class, but for some reason I am getting Classnotfoundexcetion. Can anyone help me?
EDIT ---
I have a package called test and a class called log.
package test;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
// Implements Filter class
public class log implements Filter {
public void init(FilterConfig config) {
}
public void doFilter(ServletRequest request,
ServletResponse response,
FilterChain chain)
throws java.io.IOException, ServletException {
// Get the IP address of client machine.
String ipAddress = request.getRemoteAddr();
// Log the IP address and current timestamp.
System.out.println("IP "+ ipAddress + ", Time "
+ new Date().toString());
// Pass request back down the filter chain
chain.doFilter(request,response);
}
public void destroy( ){
/* Called before the Filter instance is removed
from service by the web container*/
}
}
Thank,
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The filter-class parameter must be a Java class that must implement the Filter interface. Can you check if this is really with you?
Check out this example for guidance:
http://viralpatel.net/blogs/tutorial-java-servlet-filter-example-using-eclipse-apache-tomcat/
From the link above:
<filter>
<filter-name>LogFilter</filter-name>
<filter-class>
net.viralpatel.servlet.filters.LogFilter
</filter-class>
<init-param>
<param-name>test-param</param-name>
<param-value>This parameter is for testing.</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>LogFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
public class LogFilter implements Filter {
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {...
}
}
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Funny, this same problem just happened to me today while it was working yesterday. After research showed that nothing happened, I concluded that this is an eclipse environment issue:
- Stop tomcat server
- Clean project (Project-> Clean ...)
- Refresh the whole project (right click on the project name -> Refresh)
- Start the server again.
The problem is gone!
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For a simple solution, try putting your file log.class
in this directory:
tomcat/webapps/[your app name]/WEB-INF/classes/test
Create this directory if it doesn't exist.
How to find your .class file:
In most cases, the default for Eclipse will compile the source file ( .java
) to a file .class
whenever you save it, otherwise you may need to press CTRL-B (build) to force it to compile .class
.
Once this is done, you should be able to find the file log.class
in the Eclipse workspace at:[your workspace name]/[your eclipse project name]/bin/test/
The location of the workspace directory is usually displayed on the right when starting eclipse. For Windows 7 I think the default for directory Users
, WinXP and 2000 defaults to a custom folder Documents and Settings
.
As an alternative:
The Package Explorer should appear on the left side of the Eclipse window. It will contain the leaf log.java
in the package tree. If you right-click this sheet and then click Show In
> Navigator
, which will open the actual file structure in the Navigator view.
This view should have bin
node. Inside you should find a test
node and then inside where you will see log.class
. You can right click it to copy it and then just go to the directory I gave at the top and paste it.
Everything should be fine.
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It might be something wrong in the source code of the associated class.
I recently happened to see the same problem. After a lot of research I found that the exception is coded in the class:
$ jad BaseController.class
Parsing BaseController.class...The class file version is 51.0 (only 45.3, 46.0 and 47.0 are supported)
Generating BaseController.jad
$ cat BaseController.jad
// Decompiled by Jad v1.5.8e. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/kpdus/jad.html
...
import HttpServletRequest;
import HttpServletResponse;
import HttpSession;
...
public class BaseController
{
public BaseController()
{
throw new Error("Unresolved compilation problems: \n\tThe import javax.servlet.http.HttpServletRequest cannot be resolved\n\tThe import javax.servlet.http.HttpServletResponse cannot be resolved\n\tThe import javax.servlet.http.HttpSession cannot be resolved\n\tHttpSession cannot be resolved to a type\n\tHttpServletRequest cannot be resolved to a type\n\tHttpSession cannot be resolved to a type\n\tHttpSession cannot be resolved to a type\n\tHttpServletRequest cannot be resolved to a type\n\tHttpServletRequest cannot be resolved to a type\n\tHttpServletResponse cannot be resolved to a type\n");
}
...
So after recompiling the source with the required libraries, the problem is resolved.
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