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error in running the jsp

 
Greenhorn
Posts: 3
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Hi,
I am new to jsp and servlets.

I am trying to run the jsp called counter.jsp
<html>
<body>
<%@ page language="java" %>
<%! int count =0; %>
<% count++; %>
Welcome! You are visitor number
<%= count ; %>

</body>
</html>

I have stored the counter.jsp at the following location
C:\Program Files\Apache Software Foundation\Tomcat 5.0\webapps\ROOT

When I run counter.jsp using my tomcat 5.0(already started) by following stat. http://localhost:8080/counter.jsp , I am getting the following error

HTTP Status 500 -

--------------------------------------------------------------------------------

type Exception report

message

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

exception

org.apache.jasper.JasperException: Unable to compile class for JSP
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:97)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:346)
org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:414)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


root cause

Unable to find a javac compiler;
com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK
org.apache.tools.ant.taskdefs.compilers.CompilerAdapterFactory.getCompiler(CompilerAdapterFactory.java:106)
org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:935)
org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:764)
org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:382)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


note The full stack trace of the root cause is available in the Apache Tomcat/5.0.27 logs.


Can any body help me ??? What to do do correct the error???.
 
Ranch Hand
Posts: 135
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Hi Anant,
There are two things related to your issue, that I want to point out:
1)

Perhaps JAVA_HOME does not point to the JDK

This statement I have picked from the root cause of your error log, please check you JAVA_HOME environment variable to ensure it is reflecting the right path.
2)

<%= count; %>


This statement should give you a translation error, The reason is that expressions do not have semicolon because ultimately it will be translated to out.print(count; ) ; and this is not valid java statement. Therefore remove the semicolon.
Also if JAVA_HOME variable is fine then instead of putting this JSP file under ROOT folder try putting it under any other application folder under webapps folder and see.
I have tried your code on my system and it works absolutely fine for me.

[ May 07, 2007: Message edited by: Rancy Chadha ]

[ May 07, 2007: Message edited by: Rancy Chadha ]
[ May 07, 2007: Message edited by: Rancy Chadha ]
 
Anant Chandra
Greenhorn
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Thanks alot, Rancy.

Actually your both the statements were right.
Now I can run the code
 
Ranch Hand
Posts: 10198
3
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I think using the semicolon for the expression results in this message. Your original jsp page got translated but when it is compiling, it gives you the error message.
 
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