java.lang.NullPointerException

fs216 2009-01-20 10:41:16

10:36:28,203 WARN RequestProcessor:516 - Unhandled Exception thrown: class java.lang.NullPointerException
10:36:28,203 ERROR [action]:253 - Servlet.service() for servlet action threw exception
java.lang.NullPointerException
at com.sgoa.dao.FanganDAO.fanganSearch(FanganDAO.java:264)
at com.sgoa.service.FanganServiceImpl.fanganSearch(FanganServiceImpl.java:85)
at com.sgoa.struts.action.FanganSearchAction.execute(FanganSearchAction.java:128)
at org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:106)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at com.sgoa.helper.GbkFilter.doFilter(GbkFilter.java:29)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Unknown Source)
好像是没传到值，可我其他模块都可以的亚？还请大家帮忙看看

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yunyouyou 2009-02-03

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[Quote=引用 6 楼 shangezi 的回复:]
引用 3 楼 icerainhxj 的回复:
用debug模式单步跟踪啊，很快就知道问题在哪里了
大概你的DAO方法取的值有为Null的，在BM里没有判断Null值吧

这是最容易找出错误的方法,debug
[/Quote]

支持，

hyl04 2009-02-02

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用debug调试就知道问题所在了，也可以通过System.out.println()输出到console上，看看有没有值！

DirectRay 2009-01-29

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at com.sgoa.dao.FanganDAO.fanganSearch(FanganDAO.java:264)

wenjjing2lianee 2009-01-29

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楼主:
把传进来的值用System.out.println();输出来到控制台,
一目了然!

jackingod 2009-01-29

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[Quote=引用 2 楼 steryzone 的回复:]
at com.sgoa.dao.FanganDAO.fanganSearch(FanganDAO.java:264)
at com.sgoa.service.FanganServiceImpl.fanganSearch(FanganServiceImpl.java:85)
at com.sgoa.struts.action.FanganSearchAction.execute(FanganSearchAction.java:128)
你看看这几个有没有什么问题
[/Quote]
再就是单步调试。

zfg2003 2009-01-27

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DEBUG调试一目了然

半山听雨 2009-01-27

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ECLIPSE里捕获NULLPOINTEXCEPTION就可以了啊，他会给你指出哪一段代码存在空值的哈

KOOK_OKKO 2009-01-26

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设个断点，跟进去

robyjeffding 2009-01-24

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空指针异常，肯定有个NULL的值

whuzjf1985 2009-01-22

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取值为空楼主仔细检查下下

聂鹏 2009-01-20

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at com.sgoa.dao.FanganDAO.fanganSearch(FanganDAO.java:264)
at com.sgoa.service.FanganServiceImpl.fanganSearch(FanganServiceImpl.java:85)
at com.sgoa.struts.action.FanganSearchAction.execute(FanganSearchAction.java:128)
你到action 调用service service调用DAO 应该在DAO中出问题 FanganDAO.java:264

icerainhxj 2009-01-20