学步园

tomcat下如何配置jsp、servlet，经产遇到环境配置问题，例如：

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.

解决方法:

通过更改Tomcat( 我用的是Tomcat 5.0.28)的Java Classpath, 问题解决！