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Http 404 Error

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posted 16 years ago

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Hi ranchers,

I am getting the HTTP 404 erro when i am running my servlet....

my servlet name is HelloWorldServlet.java. I compliled and got the .class file
code:

package usingjsp;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class HelloWorldServlet extends HttpServlet
{ 
    public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException ,ServletException
    {
// Tell the Web server that the response is HTML
response.setContentType("text/html");    
 
// Get the PrintWriter for writing out the response
       PrintWriter out = response.getWriter();
 
// Write the HTML back to the browser
       out.println("<HTML>");
       out.println("<BODY>");
       out.println("<H1>Hello World!</H1>");
       out.println("</BODY>");
       out.println("</HTML>");
     }
}
 
where my .class file placed in C:\Program Files\Apache Software Foundation\Tomcat 4.1\webapps\J2EE\WEB-INF\classes\usingjsp\HelloWorldServlet
 
my web.xml file is
code:
 
<?xml version="1.0" encoding="ISO-8859-1"?>
 
<web-app xmlns="http:java.sun.com/xml/ns/j2ee" 
         xmls:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee <a href="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"" target="_blank" rel="nofollow">http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"</a> 
 version="2.4">
     <servlet>
<servlet-name>HelloWorldServlet</servlet-name>
<servlet-class>usingjsp.HelloWorldServlet</servlet-class>
     </servlet>
     <servlet-mapping>
<servlet-name>HelloWorldServlet</servlet-name>
<url-pattern>/HelloWorldServlet<url-pattern>
      </servlet-mapping>
  
</web-app>

i have placed this file in C:\Program Files\Apache Software Foundation\Tomcat 4.1\webapps\J2EE\WEB-INF\web.xml

when i typed in the location http://localhost:8080/J2EE/HelloWorldServlet
i got the 404 error

Please give me the suggestions

waiting for your valuable reply
thanks for your assistance

[BPSouther: Added code tags]
[ February 22, 2008: Message edited by: Ben Souther ]

Ben Souther

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posted 16 years ago

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...
where my .class file placed in
C:\Program Files\Apache Software Foundation\Tomcat 4.1\webapps\J2EE\WEB-INF\classes\usingjsp\HelloWorldServlet
...

Just to be clear.
Is your class file in a directory named HelloWorldServlet or did you mean to say
C:\Program Files\Apache Software Foundation\Tomcat 4.1\webapps\J2EE\WEB-INF\classes\usingjsp\HelloWorldServlet.class
?

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joseph okon

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posted 16 years ago

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C:\Program Files\Apache Software Foundation\Tomcat 4.1\webapps\J2EE\WEB-INF\classes\usingjsp\HelloWorldServlet.class
is what i mean.
thanks

Ben Souther

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posted 16 years ago

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What you've got looks good.
If there is a problem, it's not jumping out at me.

Dumb question, are you sure your container is running?
Are you seeing a container generated message or the 'Friendly Error Message' generated by your browser?

Have you looked at your container's logs to see if any exceptions are being thrown?

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joseph okon

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posted 16 years ago

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the problem was that i didn't close the <url-pattern>.
but when fixed that problem and run the application it gave me another error

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Error allocating a servlet instance
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:617)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:164)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:955)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:139)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:955)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2460)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:119)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:955)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:955)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:157)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
at java.lang.Thread.run(Thread.java:536)

root cause

java.lang.UnsupportedClassVersionError: HelloWorldServlet (Unsupported major.minor version 49.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:502)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1787)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1049)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1507)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1386)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:830)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:613)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:164)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:955)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:139)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:955)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2460)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:119)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:955)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:955)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:157)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
at java.lang.Thread.run(Thread.java:536)

Ben Souther

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posted 16 years ago

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This usually happens when you compile your classes with a new version of Java than what the container is using.

For instance, if you compiled your servlet with javac 1.6 but tried to run it in an instance of of Tomcat running under Java 1.5 you would see this.

Either upgrade the version under which Tomcat is running, compile under the same version used by Tomcat or use the 'source' attribute when compiling to let the JRE know that this class is OK to run in that particular version.

javac -source 1.5 MyServlet.java

Java API J2EE API Servlet Spec JSP Spec How to ask a question... Simple Servlet Examples jsonf

joseph okon

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Posts: 63

posted 16 years ago

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thanks Ben,
it works, i had to compile the code with -source 1.4 and boom!! it runs.
thanks once again

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