求指导myeclipse导入文件后无法打开JSP

Question

严重: Servlet.service() for servlet jsp threw exceptionjava.lang.NullPointerException at org.apache.jsp.login_jsp._jspInit(login_jsp.java:22) at org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52) at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:159) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329) 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:230) 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:261) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:619)

Answer 1

可以直接复制，如果你是在eclipse外面复制的，就是说直接在外面文件夹中对拷，那么在复制完后，要在Eclipse中把项目刷新(Refresh)下.让Eclipse能把新加的文件加载进来。

或者你直接复制以后到Eclipse左边栏的包查看器中粘贴进去，这样就不用刷新也可以。