dwr反ajax当登陆或者刷新页面的时候报错~~~~

0 0

dwr反ajax当登陆或者刷新页面的时候报错~~~~5

java.lang.NullPointerException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.directwebremoting.util.Continuation.suspend(Continuation.java:57)
at org.directwebremoting.dwrp.JettyContinuationSleeper.goToSleep(JettyContinuationSleeper.java:90)
at org.directwebremoting.dwrp.PollHandler.handle(PollHandler.java:214)
at org.directwebremoting.servlet.UrlProcessor.handle(UrlProcessor.java:101)
at org.directwebremoting.servlet.DwrServlet.doPost(DwrServlet.java:146)
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 org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
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:127)
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:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:662)

问题补充：定位不到哪句代码出错了。
全部的信息就这些
17:19:56,397 WARN org.directwebremoting.dwrp.JettyContinuationSleeper:96 - Exception
java.lang.NullPointerException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.directwebremoting.util.Continuation.suspend(Continuation.java:57)
at org.directwebremoting.dwrp.JettyContinuationSleeper.goToSleep(JettyContinuationSleeper.java:90)
at org.directwebremoting.dwrp.PollHandler.handle(PollHandler.java:214)
at org.directwebremoting.servlet.UrlProcessor.handle(UrlProcessor.java:101)
at org.directwebremoting.servlet.DwrServlet.doPost(DwrServlet.java:146)
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 org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
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:127)
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:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:662)
17:19:56,416 INFO com.lingtu.gps.action.LoginAction:128 - url:/terminalTree!subscribe.action?_dc=1331543996306&cid=711331543993138

问题补充：

lerous 写道

先debug Java代码，看是否是action里面出现的NullPointerException .
jsp里是否有Java代码？也有可能是Jsp中Java代码报的错误。

debugger过了没有问题额。。。。

问题补充：

suziwen 写道

因为dwr从2.0版本就全面支持jetty的continuation方式，所以在jetty上运行的时候，会自动使用jetty的continuation，不需要任何多余的配置，也就是说：这时用的已经不是dwr自身的反转ajax了，而是jetty的实现方式。所以当dwr在jetty上运行的时候，不需要配置反转ajax，不然会冲突

2.0以后的版本，我在项目里已经把jetty jar包移除了还是存在这个问题

问题补充：

suziwen 写道

你对DWR的配置文件，及工程的运行环境（中间件是TOMCAT?还是JETTY还是其他？）

Tomcat

问题补充：

suziwen 写道

你对DWR的配置文件，及工程的运行环境（中间件是TOMCAT?还是JETTY还是其他？）

<font color="red" size="18">我用的是Tomcat人呢？</font>

问题补充：

suziwen 写道

DWR配置文件你还没贴呢

dwr.xml
<allow>
<create creator="spring" javascript="LoginService">
<param name="beanName" value="LoginService"/>
<include method="login"/>
</create>
</allow>

web.xml

<servlet>
    <servlet-name>dwr-pull-invoker</servlet-name>
    <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
    <init-param>
    <param-name>config-dwr</param-name>
      <param-value>WEB-INF/dwr-pull.xml</param-value>
    </init-param>

<init-param>
    <param-name>activeReverseAjaxEnabled</param-name>
    <param-value>true</param-value>
</init-param>

<init-param>
<param-name>pollAndCometEnabled</param-name>
<param-value>true</param-value>
</init-param>

<init-param>
      <param-name>debug</param-name>
      <param-value>true</param-value>
    </init-param>
<load-on-startup>1</load-on-startup>

</servlet>

<servlet-mapping>
    <servlet-name>dwr-pull-invoker</servlet-name>
    <url-pattern>/dwrpull/*</url-pattern>
</servlet-mapping>

问题补充：

suziwen 写道

DWR配置文件你还没贴呢

能不能加下QQ这也太费劲了额。。。。
把您尊贵的发到j2eegis@sina.com吧

问题补充：

suziwen 写道

DWR配置文件你还没贴呢

尊贵的QQ发到那个邮箱吧麻烦您了