I got "500 Internal Server Error " as Response in HTTP Client Prog

Question

In my Java Server Proxy the following are the configurations that I followed right from SLD: Please help me where I went wrong:
In SLD->Business Landscape:
Web As Java,
->Technical System: Web As Java.
created Product and Software Component version accordingly.
In IR->created Data types and Message Types of same Data type. 
  In Message Interface created Inbound synchronous--specified both input and output message there
  In Message Mapping-> selected source and target message types and done the mapping
  In Interface Mapping->Selected source and target interfaces->read interfaces; In request tab->selected source msg and selected mapping program of type Fatal Error: com.sap.engine.lib.xml.parser.Parser</SAP:P3><SAP:Stack>Während des Anwendungs-Mappings com/sap/xi/tf/_Folder_MM_ wurde eine com.sap.aii.utilxi.misc.api.BaseRuntimeException geworfen: Fatal Error: com.sap.engine.lib.xml.parser.Parser.</SAP:Stack></SAP:Error>
=========================
Thanks a lot

Answer 1

Hi I got this as result when my Pyload is like what you said: <ns0:Foldername_MT xmlns:ns0="http://jps.com">
<name>
<XISystemhost>\<xyzdir>
</name>
</ns0:Foldername_MT>
===================
and for that I got:
Result:
http-Status:  500 Internal Server Error
Payload:
<SAP:Error><SAP:Category>XIServer</SAP:Category><SAP:Code>INTERNAL.HTTP_RESP_STATUS_CODE_NOT_OK</SAP:Code><SAP:P1>503 </SAP:P1><SAP:P2>Service Unavailable</SAP:P2><SAP:AdditionalText>&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0 Transitional//EN&quot;&gt;
&lt;html&gt;
&lt;head&gt;
     &lt;title&gt;Error Report&lt;/title&gt;
&lt;style&gt;
td {font-family : Arial, Tahoma, Helvetica, sans-serif; font-size : 14px;}
A:link
A:visited
A:active
&lt;/style&gt;
&lt;/head&gt;
&lt;body marginwidth=&quot;0&quot; marginheight=&quot;0&quot; leftmargin=&quot;0&quot; topmargin=&quot;0&quot; rightmargin=&quot;0&quot;&gt;
&lt;table width=&quot;100%&quot; cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; align=&quot;left&quot; height=&quot;75&quot;&gt;
&lt;tr bgcolor=&quot;#FFFFFF&quot;&gt;
    &lt;td align=&quot;left&quot; colspan=&quot;2&quot; height=&quot;48&quot;&gt;&lt;font face=&quot;Arial, Verdana, Helvetica&quot; size=&quot;4&quot; color=&quot;#666666&quot;&gt;&lt;b&gt;&amp;nbsp;&amp;nbsp;503 &amp;nbsp Service Unavailable&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr bgcolor=&quot;#3F73A3&quot;&gt;
    &lt;td height=&quot;23&quot; width=&quot;84&quot;&gt;&lt;img width=1 height=1 border=0 alt=&quot;&quot;&gt;&lt;/td&gt;
    &lt;td height=&quot;23&quot;&gt;&lt;img width=1 height=1 border=0 alt=&quot;&quot;&gt;&lt;/td&gt;
    &lt;td align=&quot;right&quot; height=&quot;23&quot;&gt;&lt;font face=&quot;Arial, Verdana, Helvetica&quot; size=&quot;2&quot; color=&quot;#FFFFFF&quot;&gt;&lt;b&gt;SAP J2EE Engine/6.40&amp;nbsp;&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr bgcolor=&quot;#9DCDFD&quot;&gt;
    &lt;td height=&quot;4&quot; colspan=&quot;3&quot;&gt;&lt;img width=1 height=1 border=0 alt=&quot;&quot;&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;
&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;
&lt;table width=&quot;100%&quot; cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; align=&quot;left&quot; height=&quot;75&quot;&gt;
&lt;tr bgcolor=&quot;#FFFFFF&quot;&gt;
    &lt;td align=&quot;left&quot; colspan=&quot;2&quot; height=&quot;48&quot;&gt;&lt;font face=&quot;Arial, Verdana, Helvetica&quot; size=&quot;3&quot; color=&quot;#000000&quot;&gt;&lt;b&gt;&amp;nbsp;&amp;nbsp;The requested application, JPR, is currently unavailable.&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr bgcolor=&quot;#FFFFFF&quot;&gt;
    &lt;td align=&quot;left&quot; valign=&quot;top&quot; height=&quot;48&quot;&gt;&lt;font face=&quot;Arial, Verdana, Helvetica&quot; size=&quot;2&quot; color=&quot;#000000&quot;&gt;&lt;b&gt;&amp;nbsp;&amp;nbsp;Details:&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
    &lt;td align=&quot;left&quot; valign=&quot;top&quot; height=&quot;48&quot;&gt;&lt;font face=&quot;Arial, Verdana, Helvetica&quot; size=&quot;3&quot; color=&quot;#000000&quot;&gt;&lt;pre&gt;&amp;nbsp;&amp;nbsp;No details available&lt;/pre&gt;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/body&gt;
&lt;/html&gt;
</SAP:AdditionalText><SAP:Stack>In der HTTP-Antwort liegt der Status-Code 503 mit der Beschreibung Service Unavailable vor</SAP:Stack></SAP:Error>
=========================================
What is that? Can u help me!!!
Thanks