配置如下：
用户变量：
java_home：C:\j2sdk1.4.2_06\jre
系统变量：CLASSPATH：
.;C:\j2sdk1.4.2_06\lib\dt.jar;
C:\j2sdk1.4.2_06\lib\tools.jar;
C:\j2sdk1.4.2_06\lib\NetComponents.jar;
C:\j2sdk1.4.2_06\lib\mm.mysql-2.0.4-bin.jar;
C:\Program Files\Apache Software Foundation\Tomcat 5.0\common\classes;
C:\Program Files\Apache Software Foundation\Tomcat 5.0\common\lib;
C:\Program Files\Apache Software Foundation\Tomcat 5.0\common\lib\servlet-api.jar
JAVA_HOME：C:\j2sdk1.4.2_06
PATH：.;C:\j2sdk1.4.2_06\bin
TOMCAT_HOME：C:\Program Files\Apache Software Foundation\Tomcat 5.0
出现的问题：
http://localhost:8080可以正常显示示以及里面的自带的例子全部正常
但是俺在里面root下加一个.jsp文件却不能正常显示。甚至把root下的index.jsp改成index1.jsp后就
不能正常显示了。
错误提示：
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/5.0.28 logs.
--------------------------------------------------------------------------------
Apache Tomcat/5.0.28
