Servlet.service() for servlet [jsp] in context with path [/] threw exception [Unable to compile class for JSP] with root cause
1.在work目录下找到名为"_"的文件夹里的hello_jsp.java但是没有hello_jsp.class
2.更改了servlet.xml的虚拟路径path名(如day4)后，没有错误了，也生成了hello_jsp.class
3.在上下文路径中抛出异常
解决办法：其实只要在D:\OpenSources\apache-tomcat-7.0.81\conf下的servlet.xml下如下配置
<!--Context：表示上下文，项目的环境 -->
<Context docBase="E:\Java_Study\JavaWeb\forward-redirect-scope-jsp\webapp" path=""/>
不需要再在D:\OpenSources\apache-tomcat-7.0.81\conf\Catalina\localhost下自己设置一个 ".xml"（其实这是另一种部署方法，就是在相应的文件夹下自己设置新的xml文件
其文件里面可以配置如下<Context docBase="E:\Java_Study\JavaWeb\forward-redirect-scope-jsp\webapp"/> 不需要path这样其文件名就是他的上下文路径）
九月 14, 2017 1:30:30 下午 org.apache.catalina.core.StandardWrapperValve invoke严重: Servlet.service() for servlet [jsp] in context with path [/] threw exception [Unable to compile class for JSP] with root causejava.lang.IllegalArgumentException: Negative time at java.io.File.setLastModified(File.java:1427) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:377) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:354) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:341) at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:660) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:364) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339) at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1115) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748)
