高手指教：jsp中出现The full stack trace of the root cause is available in the Apache Tomcat/7.0.47 logs.异常

crownwangmian 2022-04-30 17:56:03

Exception report

message Unable to compile class for JSP:

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: 

An error occurred at line: 7 in the jsp file: /index.jsp
System.out cannot be resolved to a type
4: 
5: <%
6:    int a = 0;
7:     System.out.println(a);
8: 
9: %>
10: </body>


Stacktrace:
	org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:103)
	org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:366)
	org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:468)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:378)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:646)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)

请高手指教，为什么我的 jsp中出现了 java System.out.println(a); 指令，就会报错误500；我的tomcat 版本是8，jdk版本1.8，并且maven 中，也加注了<scope>provided</scope>

望指教，多谢。

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