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Posted to user@struts.apache.org by O_Parthasarathy Kesavaraj <Pa...@PLANETASIA.COM> on 2003/06/25 16:47:29 UTC
Problem in Iterating over a form bean property
Hai
I have not received any replies.let me put my question like this.is it
possible to iterate over an ArrayList which is my form bean's property
Regards
Partha
In formbean i am having an arraylist that contains a value object having id
and name.I am loading that in my jsp.The code goed like this.
<logic:iterate id="element" property="userAdmins">
<TR>
<TD><bean:write name="element" property="id"/> </TD>
<TD><bean:write name="element" property="name"/><BR></TD>
</TR>
</logic:iterate>
Here userAdmins is the ArrayList containing an instance of my value object
VO.vo has setId and setName and corresponding getters.I am getting the
following exception.
java.lang.NullPointerException
at java.util.Hashtable.get(Hashtable.java:329)
at
org.apache.jasper.runtime.PageContextImpl.findAttribute(PageContextImpl.java
:308)
at org.apache.struts.util.RequestUtils.lookup(RequestUtils.java:787)
at org.apache.struts.util.RequestUtils.lookup(RequestUtils.java:835)
at
org.apache.struts.taglib.logic.IterateTag.doStartTag(IterateTag.java:300)
at
org.apache.jsp.user_admins_jsp._jspService(user_admins_jsp.java:207)
at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:2
10)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.
java:684)
at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatch
er.java:432)
at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher
.java:356)
at
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:10
33)
at
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProces
sor.java:436)
at
org.apache.struts.action.RequestProcessor.processActionForward(RequestProces
sor.java:401)
at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279)
at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1422)
at
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:523)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:247)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:193)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
va:256)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:643)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja
va:191)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:643)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180
)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:643)
at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.
java:171)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:641)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172
)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:641)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java
:174)
at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invok
eNext(StandardPipeline.java:643)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at
org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne
ction(Http11Protocol.java:392)
at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:619)
at java.lang.Thread.run(Thread.java:536)
Please Help.
Regards
Partha
> ----------
> From: O_Parthasarathy Kesavaraj
> Reply To: Struts Users Mailing List
> Sent: Wednesday, June 25, 2003 7:02 PM
> To: 'Struts Users Mailing List'
> Subject: Proble in Iterating over a form bean property
>
> Hai
> In formbean i am having an arraylist that contains a value object having
> id
> and name.I am loading that in my jsp.The code goed like this.
>
> <logic:iterate id="element" property="userAdmins">
> <TR>
> <TD><bean:write name="element" property="id"/> </TD>
> <TD><bean:write name="element" property="name"/><BR></TD>
> </TR>
> </logic:iterate>
> Here userAdmins is the ArrayList containing an instance of my value object
> VO.vo has setId and setName and corresponding getters.I am getting the
> following exception.
> java.lang.NullPointerException
> at java.util.Hashtable.get(Hashtable.java:329)
> at
> org.apache.jasper.runtime.PageContextImpl.findAttribute(PageContextImpl.ja
> va
> :308)
> at org.apache.struts.util.RequestUtils.lookup(RequestUtils.java:787)
> at org.apache.struts.util.RequestUtils.lookup(RequestUtils.java:835)
> at
> org.apache.struts.taglib.logic.IterateTag.doStartTag(IterateTag.java:300)
> at
> org.apache.jsp.user_admins_jsp._jspService(user_admins_jsp.java:207)
> at
> org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at
> org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java
> :2
> 10)
> at
> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
> at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at
> org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatche
> r.
> java:684)
> at
> org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispat
> ch
> er.java:432)
> at
> org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatch
> er
> .java:356)
> at
> org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:
> 10
> 33)
> at
> org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProc
> es
> sor.java:436)
> at
> org.apache.struts.action.RequestProcessor.processActionForward(RequestProc
> es
> sor.java:401)
> at
> org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:27
> 9)
> at
> org.apache.struts.action.ActionServlet.process(ActionServlet.java:1422)
> at
> org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:523)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applicati
> on
> FilterChain.java:247)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilter
> Ch
> ain.java:193)
> at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.
> ja
> va:256)
> at
> org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.inv
> ok
> eNext(StandardPipeline.java:643)
> at
> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480
> )
> at
> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
> at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.
> ja
> va:191)
> at
> org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.inv
> ok
> eNext(StandardPipeline.java:643)
> at
> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480
> )
> at
> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
> at
> org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
> at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:1
> 80
> )
> at
> org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.inv
> ok
> eNext(StandardPipeline.java:643)
> at
> org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValv
> e.
> java:171)
> at
> org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.inv
> ok
> eNext(StandardPipeline.java:641)
> at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:1
> 72
> )
> at
> org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.inv
> ok
> eNext(StandardPipeline.java:641)
> at
> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480
> )
> at
> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
> at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.ja
> va
> :174)
> at
> org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.inv
> ok
> eNext(StandardPipeline.java:643)
> at
> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480
> )
> at
> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
> at
> org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
> at
> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594)
> at
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processCon
> ne
> ction(Http11Protocol.java:392)
> at
> org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
> at
> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.j
> av
> a:619)
> at java.lang.Thread.run(Thread.java:536)
>
> Please Help.
> Regards
> Partha
>
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