[XQZone General] xq tags and PDF document

[Ron Hitchens]

    I took a look at the source code for the JSP
tag library (http://xqzone.marklogic.com/svn/jsp/trunk/).

    The cause of this exception is that your XQuery
evaluates to a binary() node (the PDF file).  Sadly,
there doesn't seem to be a workaround for this in the
current version of the tag library.

    The JSP tag library was written back before MarkLogic
Server supported binary() and there was a presumption
that all query results could be represented as text.  This
exception is resulting because attempting to get a text
reader of the binary() node results in a null pointer.

    The tag library could be smartened up to recognize
and pass through a binary() node (though you couldn't
use the simple form below, which does "asString()").

    I don't have the bandwidth to update it now.  But
it's open source and you (or someone else) could take
a crack at it.  I'd be happy to advise if you want to
give it a try.

On Aug 2, 2006, at 12:43 PM, Ashish Joshi wrote:

>
>
> I loaded  a PDF document in the Mark Logic Server.  I can see the  
> PDF file using the use-cases server as PDF document.  When I try to  
> access the document in the xq tags I run into error.
>
>
>
>
>
> <xq:execute>
>    <xq:query>
>        doc("c:\temp\a.pdf")
>    </xq:query>
> </xq:execute>
>
>
>
> type Exception report
>
> message
>
> description The server encountered an internal error () that  
> prevented it from fulfilling this request.
>
> exception
>
> org.apache.jasper.JasperException
> 	org.apache.jasper.servlet.JspServletWrapper.service 
> (JspServletWrapper.java:372)
> 	org.apache.jasper.servlet.JspServlet.serviceJspFile 
> (JspServlet.java:292)
> 	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
> 	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
>
>
> root cause
>
> java.lang.NullPointerException
> 	com.marklogic.xqrunner.xdbc.XdbcResultItem.writeTo 
> (XdbcResultItem.java:216)
> 	com.marklogic.xqrunner.xdbc.XdbcResult.writeTo(XdbcResult.java:250)
> 	com.marklogic.jsptaglib.xquery.rt.ExecuteTag.outputResult 
> (ExecuteTag.java:243)
> 	com.marklogic.jsptaglib.xquery.rt.ExecuteTag.doEndTag 
> (ExecuteTag.java:218)
> 	org.apache.jsp.tutorial.example6_jsp._jspx_meth_xq_execute_0 
> (example6_jsp.java:144)
> 	org.apache.jsp.tutorial.example6_jsp._jspService(example6_jsp.java: 
> 75)
> 	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
> 	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
> 	org.apache.jasper.servlet.JspServletWrapper.service 
> (JspServletWrapper.java:324)
> 	org.apache.jasper.servlet.JspServlet.serviceJspFile 
> (JspServlet.java:292)
> 	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
> 	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
>
>
> note The full stack trace of the root cause is available in the  
> Apache Tomcat/5.0.28 logs.
>
> Thanks,
>
> --Ashish
>
>
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---
Ron Hitchens {ron.hitchens at marklogic.com}  650-655-2351