尝试在Eclipse Tomcat 4 Server中运行示例index.jsp页面。 项目所需的JDK和JRE为1.5，但系统JDK和JRE为1.8
出现以下错误：
type Exception report
message Internal Server Error
description The server encountered an internal error (Internal Server Error) that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: sun/tools/javac/Main
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:481)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
root cause
java.lang.NoClassDefFoundError: sun/tools/javac/Main
at org.apache.jasper.compiler.SunJavaCompiler.compile(SunJavaCompiler.java:136)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:272)
at org.apache.jasper.servlet.JspServlet.loadJSP(JspServlet.java:548)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary(JspServlet.java:176)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:188)