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On posting from struts jsp form to the same page I get Cannot find bean (Form) in any scope.

 
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I have a JSP form which is posting data to an action which again on SUCCESS returns this same JSP page only. Now on doing this I get message "Cannot find bean: "getTwitterPostForm" in any scope
at org.apache.struts.tagl"

I know the reason for this: I am posting from a JSP to an action which on success opens this same JSP page. and at that moment FormBean will not be available to it will give this message.But I dont know how to get rid of this error message:

Below is my JSP page:




below is portion of struts-config file:




But this gives below error message:

SEVERE: Servlet.service() for servlet jsp threw exception
javax.servlet.jsp.JspException: Cannot find bean: "getTwitterPostForm" in any scope
at org.apache.struts.taglib.TagUtils.lookup(TagUtils.java:864)
at org.apache.struts.taglib.bean.WriteTag.doStartTag(WriteTag.java:233)
at org.apache.jsp.twitterResults_jsp._jspx_meth_bean_005fwrite_005f0(twitterResults_jsp.java:218)
at org.apache.jsp.twitterResults_jsp._jspService(twitterResults_jsp.java:93)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
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.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
at org.apache.struts.chain.commands.servlet.PerformForward.handleAsForward(PerformForward.java:113)
at org.apache.struts.chain.commands.servlet.PerformForward.perform(PerformForward.java:96)
at org.apache.struts.chain.commands.AbstractPerformForward.execute(AbstractPerformForward.java:54)
at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:305)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
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.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:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)
26 May, 2013 8:17:39 PM org.apache.struts.chain.commands.AbstractExceptionHandler execute
WARNING: Unhandled exception




Please advice how to get rid of this error message.

Thanks.



 
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You can add scope="session" on the /getTwitterPostsAction config. THis will leave the same form available for you to use later. Or you could forward to a different JSP on success that doesn't require the form.
 
Monica Shiralkar
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I cannot forward to another JSP page because I want to show the data in same JSP page as the form page.Below is my complete code which generates error" Caused by: javax.servlet.ServletException: javax.servlet.jsp.JspException: Cannot find bean: "data" in any scope" although I have this array List in Form Bean property too.

Struts config file:




JSP page




Action class:







Form Bean:



It leads to error message: javax.servlet.jsp.JspException: Cannot find bean: "data" in any scope"

thanks
 
Monica Shiralkar
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Unable to get rid of the error. But I am not able to understand that why do we need to put it in request or session scope when it is already in Form Bean.Whatever is in form bean with getter setter should be available in JSP page. Please correct me if I am wrong.
 
Jeanne Boyarsky
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Unless you specify otherwise, a form lives in the request scope. This means it is available for that page forward. But when you submit another page later, it is no longer available.
 
Monica Shiralkar
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Thanks a lot. However I have one doubt.

" But when you submit another page later, it is no longer available."



But how am I submiting to another page? I have index1.jsp from which I am posting to an action which should again display date in same index1.jsp. So it is the same page.

You can add scope="session" on the /getTwitterPostsAction config. THis will leave the same form available for you to use later




Why should it not work without session scope when it is in the same page.
 
Monica Shiralkar
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I have added scope ="session" but still i get the same error message.Below is the entire code:
Struts Config file.



HelloWordlAction.java





HelloWorldForm.java





index1.jsp





thanks
 
Monica Shiralkar
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Thanks its resolved now.Thats working
 
Monica Shiralkar
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Only doubt I have is why did I have to add scope="session" when I am using it in the Same JSP page. when there is a single JSP page involved.
 
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The fact that it is the same JSP is completely irrelevant. There are two separate requests. What's loaded by the request is moot.
 
Monica Shiralkar
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I realised I was doing a mistake.The data to be displayed I was setting as setter in Action Class when all I had to do was to set that as request.setAttribute.

thanks.
 
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