org.apache.jasper.JasperException: Unable to compile class for JSP

org.apache.jasper.JasperException: Unable to compile class for JSP: 

Stacktrace: 

at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:85) 

at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330) 

at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:415) 

at org.apache.jasper.compiler.Compiler.compile(Compiler.java:308) 

at org.apache.jasper.compiler.Compiler.compile(Compiler.java:286) 

at org.apache.jasper.compiler.Compiler.compile(Compiler.java:273) 

at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566) 

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:308) 

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) 

at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) 

at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228) 

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) 

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) 

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) 

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216) 

at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) 

at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634) 

at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445) 

at java.lang.Thread.run(Unknown Source) 

根据百度试了好几个解决方法才找到问题所在，这个exception是说不能完成JSP的编译，造成的原因是没有正确的设置VM，只需要让编译项目用的VM和Tomcat用的VM保持一致，这个问题就可以解决掉。