Peculiar problem with js and css file

[kapil Gupta]

My JSP is submitting a form to servlet and servlet after processing the date and storing it into session forwards the request to the same JSP. The JSP onload checks that if value of particular variable is true, it closes itself. The JSP includes a javascript and .css file. The problem is when the request is forwarded to the JSP, i receieve following error in my tomcat console (Am using tomcat integrated in JBoss 3.2.5). But these errors are displayed when i first open this JSP from a link

2005-08-24 18:18:32,540 INFO [org.jboss.web.localhost.Engine] StandardContext[/workflow]Marking servlet org.apache.catalina.INVOKER.javascript.js as unavailable
2005-08-24 18:18:32,540 ERROR [org.jboss.web.localhost.Engine] StandardContext[/workflow]Error loading org.jboss.web.tomcat.tc5.WebCtxLoader$ENCLoader@4ae19a javascript.js
java.lang.ClassNotFoundException: javascript.js
at java.net.URLClassLoader$1.run(URLClassLoader.java:198)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:186)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:262)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:954)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:687)
at org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:369)
at org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:133)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:72)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.jboss.web.tomcat.security.JBossSecurityMgrRealm.invoke(JBossSecurityMgrRealm.java:275)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:536)

Any idea what could be the reason of the above exception?

Thanks,
Kapil

[kapil Gupta]

Sorry for typing mistake. The error is not displayed when the JSP is loaded for the first time from a link

[Ulf Dittmer]

java.lang.ClassNotFoundException: javascript.js

It looks like your servlet is not configured correctly, or the URL you are submitting the page to is not correct.

[Bear Bibeault]

You are probably using relative references to the js and css resources. Bad idea.

[Yuriy Zilbergleyt]

Out of curiosity, why are you using includes for the .css and .js files instead of the standard HTML references like:

<LINK rel="stylesheet" type="text/css" href="css/main.css"/>
<script type="text/javascript" src="js/main.js"></script>

-Yuriy

[Bear Bibeault]

When he said "include" I assumed he meant using those mechanisms. It would be odd indeed to use a JSP include for such resources.

[kapil Gupta]

Yes, am using the standard HTML reference as Yuriy has mentioned. MY css and js files are in same directory as the JSP so I am refering them directly without giving the full path from the context. What i cant understand is why tomcat is treating .js and .css files as servlets?

[David Ulicny]

Could provide the code which do this exception?

[kapil Gupta]

The JSP code snippet is following

The error comes after rediection to JSP page before it closes

  
 
<%@ page contentType="text/html; charset=UTF-8" language="java" %>
<HTML>
<HEAD><title>Recurrence Screen</title>
  <LINK REL="stylesheet" href="Initiator.css" type="text/css" />
   <SCRIPT LANGUAGE="JavaScript" SRC="javascript.js"></SCRIPT>
<script>
function onLoading(){
 
  <%
  String isDataSetInServlet=(String)request.getAttribute("isDataSetInServlet");
  if(isDataSetInServlet!=null){
  if(isDataSetInServlet.equals("true"))
{%>
alert("closing");
window.close();
<% }
  } %>
 
</script>
</head>
 
<body  OnLod="onLoading();" >
 
<form name="recurrence"  method="post" action="/workflow/servlet/com.myapp.initiator.jsp.helper.RecurrenceServlet">
</form>
</body>
</html>
 
The servlet code which does redirection is:
String isDataSetInServlet = "true";
         request.setAttribute("isDataSetInServlet", isDataSetInServlet);
         RequestDispatcher rd = request.getRequestDispatcher(
               "/Initiator/Recurrence2.jsp");
         rd.forward(request, response);

[David Ulicny]

I'm not sure if it helps, but try it:
in body tag should be OnLoad
In function onLoading you are missing closing bracket.

[kapil Gupta]

I wrote <body onLod> because the site doesnot allow onload to be written while uploading code. I forgot to add closing bracked while pasting code. Actually, its a huge JSP thats why I added the relevant code. The error messages come even If I only use the given code snippet for JSP.

[David Ulicny]

Look at the java class which is generated from this JSP. There you should see what's happened whith javascript.js .

[kapil Gupta]

The generated code is following

  
package org.apache.jsp.Initiator;
 
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
 
public final class Recurrence2_jsp extends org.apache.jasper.runtime.HttpJspBase
    implements org.apache.jasper.runtime.JspSourceDependent {
 
  private static java.util.Vector _jspx_dependants;
 
  public java.util.List getDependants() {
    return _jspx_dependants;
  }
 
  public void _jspService(HttpServletRequest request, HttpServletResponse response)
        throws java.io.IOException, ServletException {
 
    JspFactory _jspxFactory = null;
    PageContext pageContext = null;
    HttpSession session = null;
    ServletContext application = null;
    ServletConfig config = null;
    JspWriter out = null;
    Object page = this;
    JspWriter _jspx_out = null;
    PageContext _jspx_page_context = null;
 

    try {
      _jspxFactory = JspFactory.getDefaultFactory();
      response.setContentType("text/html; charset=UTF-8");
      pageContext = _jspxFactory.getPageContext(this, request, response,
      null, true, 8192, true);
      _jspx_page_context = pageContext;
      application = pageContext.getServletContext();
      config = pageContext.getServletConfig();
      session = pageContext.getSession();
      out = pageContext.getOut();
      _jspx_out = out;
 
      out.write('\r');
      out.write('\n');
      out.write("\r\n");
      out.write("<HTML>\r\n");
      out.write("\t<HEAD><title>Recurrence Screen</title>\r\n");
      out.write("  <LINK REL=\"stylesheet\" href=\"Initiator.css\" type=\"text/css\" />\r\n");
      out.write("   <SCRIPT LANGUAGE=\"JavaScript\" SRC=\"javascript.js\"></SCRIPT>\r\n");
      out.write("<script>\r\n");
      out.write("function onLoading(){\r\n");
      out.write("\r\n");
      out.write("  ");
 
  String isDataSetInServlet=(String)request.getAttribute("isDataSetInServlet");
  if(isDataSetInServlet!=null){
  if(isDataSetInServlet.equals("true"))
{
      out.write("\r\n");
      out.write("alert(\"closing\");\r\n");
      out.write("window.close();\r\n");
 }
  } 
      out.write("\r\n");
      out.write("\r\n");
      out.write("</script>\r\n");
      out.write("</head>\r\n");
      out.write("\r\n");
      out.write("<body  onLod=\"onLoading();\" >\r\n");
      out.write("\r\n");
      out.write("<form name=\"recurrence\"  method=\"post\" action=\"/workflow/servlet/com.myapp.initiator.jsp.helper.RecurrenceServlet\">\r\n");
      out.write("</form>\r\n");
      out.write("</body>\r\n");
      out.write("</html>\r\n");
      out.write("\r\n");
    } catch (Throwable t) {
      if (!(t instanceof SkipPageException)){
        out = _jspx_out;
        if (out != null && out.getBufferSize() != 0)
          out.clearBuffer();
        if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
      }
    } finally {
      if (_jspxFactory != null) _jspxFactory.releasePageContext(_jspx_page_context);
    }
  }
}
 

[David Ulicny]

Everything looks fine.
I'm sorry, I have no other ideas
[ August 25, 2005: Message edited by: David Ulicny ]

[Ben Souther]

You may want to take a look at the generated servlet code to see what the JSP compiler has actually done with your code.

[Ulf Dittmer]

Things to check and/or show us:

1) What does the actual HTML look like?

2) What does javascript.js do?

3) What does your servlet configuration and mapping look like?

4) How is the form submitted? The action does not correspond to the class shown in your stack trace, and the form does not contain any fields; is that intentional?
[ August 25, 2005: Message edited by: Ulf Dittmer ]

[kapil Gupta]

The js file contains some utility functions common to my application. The screen is a popup window and its objective is to submit a form to a servlet and after successful completion, the form closes itself. The form is not submitted if I write window.close just after submitting, thats why i redirect the request back to same jsp which checks that the request is forwarded from a servlet and closes itself.
I found that if i use sendRedirect instead of requestDispatcher.forward in servlet, there is no error in tomcat but that doesn't solve my purpose

[Yuriy Zilbergleyt]

The problem is that since you're forwarding and not redirecting, the browser thinks you are still in the servlet directory. For example, in the page showing you are submitting to

/workflow/servlet/com.myapp.initiator.jsp.helper.RecurrenceServlet

If that servlet forwards to a JSP, then any relative references in the JSP will be relative to the mapped location of the servlet, that is a link to "javascript.js" will actually be a link to "<context>/workflow/servlet/javascript.js". To link to the a javascript file inside the Initiator directory you'd have to have use "../../Initiator/javascript.js". Inother words you must link as though your JSP page was in the same location that the servlet was mapped to.

A better way would probably be to use request.getContextPath() to get the root of the application:

<link rel="stylesheet" href="<%=request.getContextPath()%>/Initiator/Initiator.css" type="text/css"/>

scriptless version:

<link rel="stylesheet" href="${pageContext.request.contextPath}/Initiator/Initiator.css" type="text/css"/>

-Yuriy
[ August 26, 2005: Message edited by: Yuriy Zilbergleyt ]

[kapil Gupta]

Thanks yuriy,U hit the bull's eye.
Its working fine now. Thanks once again.
Kapil