hi, 

Firstly, I am very new in JBoss, absolute beginner.

I have downloaded the JBoss 4.0 intergrated with Tomcat 5. And when I run it 
for the first time, and then go to the web console: 
http://localhost:8080/jmx-console/

I received error like this:

anonymous wrote : 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:810)
  |     
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:75)
  | 
  | 
  | 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:105)
  |     org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:929)
  |     org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:758)
  |     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:810)
  |     
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:75)
  | 
  | 
  | note The full stack trace of the root cause is available in the Apache 
Tomcat/5.0.28 logs.

Does it have something problem with Tomcat ?

Could anyone please help me to solve it ? Do I need to set any classpath or any 
new environment variables in Windows XP ?

Thank you very much.


Ngoc Long Nguyen

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