tomcat 碰到一个莫名其妙的问题

严重: Servlet.service() for servlet action threw exception

java.lang.NullPointerException

	at com.riash.action.RoomAddAction.execute(RoomAddAction.java:33)

	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)

	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)

	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)

	at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)

	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 com.riash.filter.DataFilter.doFilter(DataFilter.java:56)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)

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

	at com.riash.filter.Pool.doFilter(Pool.java:35)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)

	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)

提示错误位置是 RoomAddAction.java 但是实际上我已经把里面的所有代码都注释掉了，还是报这个错误。
------解决方案--------------------
是不是tomcat下的该类没有重新编译，重新部署下试试
------解决方案--------------------
把tomcat下的work文件夹删掉重启
------解决方案--------------------
如楼上所说，删除tomcat目录下\work\Catalina\localhost\你的项目，重启就OK
------解决方案--------------------
你把项目全部删掉（备份下）。启动一个空的tomcat。然后localhost:8080看是否正常