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POPost parameters are becoming null (at random)
 

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  1. POPost parameters are becoming null (at random)
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    <p>My web application is developed with Struts2 and it was working fine till recently. All of a sudden one of the modules has started malfunctioning. </p> <p>The malfunctioning module is 'Update Student details' page. This page has a lot of fields like 'schoolName', 'degreeName', etc . </p> <pre><code>School 1: &lt;input name="schoolName"&gt; School 2: &lt;input name="schoolName"&gt; ..... School n: &lt;input name="schoolName"&gt; </code></pre> <p>As mentioned earlier, the page was working perfectly fine till recently. Now, one/many of the values of 'schoolName', 'degreeName', etc are being received as "" (EMPTY STRING) on the server-side. </p> <p>For debugging, I used firebug and remote-debugging in eclipse. I find that the post-parameters are correct on the client-side. For instance, during one of the submissions the post-parameters were as below (i noted them from firebug). </p> <pre><code>Content-Type: multipart/form-data; boundary=---------------------------2921238217421 Content-Length: 48893 &lt;OTHER_PARAMETERS&gt; &lt;!--Truncated for clarity --&gt; -----------------------------2921238217421 Content-Disposition: form-data; name="schoolName" ABC Institute -----------------------------2921238217421 Content-Disposition: form-data; name="schoolName" Test School -----------------------------2921238217421 Content-Disposition: form-data; name="schoolName" XYZ -----------------------------2921238217421 Content-Disposition: form-data; name="schoolName" Texas Institute -----------------------------2921238217421 Content-Disposition: form-data; name="schoolName" XXXX School -----------------------------2921238217421-- </code></pre> <p>But on the server-side, the request params were as below: </p> <pre><code>schoolName=[ABC Institute, Test School, XYZ, , XXXX School], </code></pre> <p>"Texas Institute" was received as "" (EMPTY STRING) in this particular case. This is not happening consistently. The parameters that become NULL (or EMPTY STRING) seem random to me - during one instance, parameter schoolName[3] became null as illustrated above, parameter schoolName[2] became null during yet another submission, etc. At times, none of the parameters are nullified. </p> <p>The following is the list of the interceptors in the action definition. </p> <pre><code>List of interceptors: ---------------------- FileUploadInterceptor org.apache.struts2.interceptor.FileUploadInterceptor ServletConfigInterceptor org.apache.struts2.interceptor.ServletConfigInterceptor StaticParametersInterceptor com.opensymphony.xwork2.interceptor.StaticParametersInterceptor ParametersInterceptor com.opensymphony.xwork2.interceptor.ParametersInterceptor MyCustomInterceptor com.xxxx.yyyy.interceptors.GetLoggedOnUserInterceptor </code></pre> <p>This issue appears rather weird to me and I have not been able to zero-in on the exact cause of the issue. Any help in this regard would be highly appreciated. Thanks in advance. </p> <p>Thanks, Raghuram</p>
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    1. USRaghuram Duraisamy
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      1. POPost parameters are becoming null (at random)
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    1. COI suggest you first eliminate network transmission problems by capturing the traffic at the server using Wireshark to make sure you are receiving all the data at the adapter. If the data looks OK there, then you will probably have to load the Struts2 source and debug into the interceptors to see what's happening. A question: Is the extra blank line after `XXXX School` really there?
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      1. USJim Garrison
    2. CO>>> A question: Is the extra blank line after XXXX School really there? Sorry, NO. There is no extra blank line.
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      1. POPost parameters are becoming null (at random)
      1. USRaghuram Duraisamy
 

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