ssh里的一个问题！！

Question

           action里gg可以取到值了！setDoortypename的时候报空指针错误！！ String gg=request.getParameter("add1");                   foolAddForm.getBasdoor().setDoortypename(gg);

Answer 1

错误信息
2010-05-06 00:18:05,260 WARN [org.apache.struts.action.RequestProcessor] - Unhandled Exception thrown: class java.lang.NullPointerException
2010-5-6 0:18:05 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet action threw exception
java.lang.NullPointerException
at com.yidu.greenhouse.struts.action.bas.FoolAddAction.execute(FoolAddAction.java:58)
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:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.yidu.greenhouse.filter.EncoderFilter.doFilter(EncoderFilter.java:34)
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:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Unknown Source)

Answer 2

foolAddForm.getBasdoor() null  回答完毕

Answer 3

class java.lang.NullPointerException
空指针异常，肯定是你用null调用了某个方法...很有可能是foolAddForm.getBasdoor()这个为空! or foolAddForm 为空!

Answer 4

表单指定了文件上传，request.getParameter(..),是取不到表单中的值的，只能取到地址栏的参数。