Problem with Jsp Init parameter

[Deepaks Deshpande]

Hi Guys,

I am trying to implement JSP init parameters but i am getting the HTTP 404 error . Please help me out.

My DD(web.xml) has the following definition

  <!-- Servlet definition for JSP init parameters -->
  <servlet>
  	<servlet-name>JspInitParams</servlet-name>
  	<jsp-file>/jsp/JspInitParamaters.jsp</jsp-file>
  	<init-param>
  		<param-name>userName</param-name>
  		<param-value>Deepak</param-value>
  	</init-param>
  </servlet>
  
  <!-- Servlet Mappings for JSP init Parameter declarations -->
  <servlet-mapping>
  	<servlet-name>JspInitParams</servlet-name>
  	<url-pattern>/JspInitParams.jsp</url-pattern>
  </servlet-mapping>

My JSP is as follows:

<p>
	Hello
	<%=config.getInitParameter("userName")%>, Greetings...!
	from JSP Servlet init params.
</p>

My JSP is in a directory called jsp in my eclipse project. So, should i include the jsp in the <jsp-page> tag and specify the <jsp-page> value as /jsp/JspInitParamaters.jsp?
Also, my eclipse console is not printing out any messages.

When I access this JSP via the URL given in the <url-pattern> tag, i get an HTTP 404 error and when I access the JSP directly i am getting the parameter value as null. I am using Apache tomcat 6.0.29.
Please help.

[Frits Walraven]

Hi!

Your code works fine on my server.

Did you access an URL that looks like?

http://localhost:8080/WebApplicationRoot/JspInitParams.jsp

note: your context-root should be in the WebApplicationRoot

When I access this JSP via the URL given in the <url-pattern> tag, i get an HTTP 404 error

This just means that the page cannot be found, most probably caused by a wrong directory structure. Try to build a .war file by hand. You can use the following instructions: HowToCreateWebApplicationWithoutAnIDE

when I access the JSP directly i am getting the parameter value as null.

That is correct in order to get to the init parameters you should use the url-pattern in the servlet-mapping element.

Regards,
Frits

[Deepaks Deshpande]

When I run the same code with apache tomcat 7 i get the following exception. I am clueless.

SEVERE: Servlet /Servlets threw load() exception
javax.servlet.ServletException: missing jspFile
	at org.apache.jasper.servlet.JspServlet.init(JspServlet.java:122)
	at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1189)
	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1103)
	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1010)
	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4935)
	at org.apache.catalina.core.StandardContext$3.call(StandardContext.java:5262)
	at org.apache.catalina.core.StandardContext$3.call(StandardContext.java:5257)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:619)
May 11, 2011 11:13:22 AM org.apache.coyote.AbstractProtocolHandler start
INFO: Starting ProtocolHandler ["http-bio-8080"]
May 11, 2011 11:13:22 AM org.apache.coyote.AbstractProtocolHandler start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
May 11, 2011 11:13:22 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 272 ms
May 11, 2011 11:13:30 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Allocate exception for servlet JspInitParams
javax.servlet.ServletException: missing jspFile
	at org.apache.jasper.servlet.JspServlet.init(JspServlet.java:122)
	at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1189)
	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1103)
	at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:813)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:619)

[Frits Walraven]

3 questions:

- What is the URL you are accessing?
- How does the directory structure of your web-app look like?
- Did you try to follow the instructions I gave you?

Regards,
Frits

[Deepaks Deshpande]

Hey Frits, to answer your questions,
1) I am accessing http://localhost:8080/Servlets/JspInitParams.jsp as JspInitParams.jsp is what i have specified as the URL pattern in the servlet mapping.
2) I am using eclipse so, there should not be any issues with the directory structure. FYI i am using a dynamic web project.
3) Yes i tried doing it your way but still got the above exception with tomcat 7.0.12

[Frits Walraven]

can you check what is deployed on the server:
dirOfYourUser\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0 (or tmp1 or tmp2.....)

Is there a directory called Servlets?
can you see the jsp-file there?

Regards,
Frits

[Deepaks Deshpande]

Yes Frits,
The file JspInitParameters.jsp is there in the Directory workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\Servlets\jsp.
What next?

[Frits Walraven]

The file JspInitParameters.jsp is there in the Directory workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\Servlets\jsp.

Is it it maybe JspInitParameters.jsp in your project and JspInitParamaters.jsp in your web.xml?

[Deepaks Deshpande]

Hey Frits,

That was really a very silly spelling mistake. Thanks for pointing it out. It's alright now.

[Frits Walraven]

That was really a very silly spelling mistake.

I also do that all the time....

Anyway we found it, and it was good for you to see how you can narrow it down by excluding other mistakes (like dir-structure)

Regards,
Frits