eXist-db

Hi, I have an issue I am stuck with in the latest CVS code.  I am
trying to use the cocoon generator and the query works fine on the
first try, but I always get a NullPointerException on the second.

1. Here is the sitemap call I have.  I added the create-session after
looking at the examples that come with eXist.
<map:generate type=3D"xquerygenerator" label=3D"debug1"
src=3D"module:flow-attr:xqueryStr">
   <map:parameter name=3D"create-session" value=3D"true"/>
</map:generate>

2. Here is my generator definition.
<map:generator label=3D"content" logger=3D"sitemap.generator.xquery"
name=3D"xquerygenerator" src=3D"org.exist.cocoon.XQueryGenerator"/>

3. Here is my flowscript call.
cocoon.sendPage("myPage/", {"xqueryStr": javaObj.xQueryString});

4. I did not get the exception when I edited
LocalXPathQueryService.java on line 161:
CompiledXQuery compiled =3D pool.borrowCompiledXQuery(broker, source);

replacing it with the line:
CompiledXQuery compiled =3Dnull;

but then eXist will never get the compiled xQuery.  I'm not sure what
to do other than that.

5. Here is the stack trace, and to reiterate, this works fine the
first time and I only get an exception after the first call.
java.lang.NullPointerException
=09at org.exist.source.CocoonSource.isValid(CocoonSource.java:70)
=09at org.exist.storage.XQueryPool.borrowCompiledXQuery(XQueryPool.java:119=
)
=09at org.exist.xmldb.LocalXPathQueryService.execute(LocalXPathQueryService=
.java:161)
=09at org.exist.cocoon.XQueryGenerator.generate(XQueryGenerator.java:264)
=09at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline.proc=
essXMLPipeline(AbstractProcessingPipeline.java:575)


6. Has anyone seen this before?  Could there be a more generic cocoon
configuration I need to setup in order for this to work?

thanks, dan

[Exist-open] Issue with Cocoon Generator, LocalXPathQueryService From: Dan Ochs <dan.ochs@gm...> - 2005-08-24 17:19 hi, I posted this message a few weeks ago, but never got a response from anyone. We are still seeing the issue from the latest in CVS. =20 Ithough I would post it again to see if anyone has any ideas/suggestions? thanks! dan I am trying to use the cocoon generator and the query works fine on the first try, but I always get a NullPointerException on the second. 1. Here is the sitemap call I have. I added the create-session after looking at the examples that come with eXist. <map:generate type=3D"xquerygenerator" label=3D"debug1" src=3D"module:flow-attr:xqueryStr"> <map:parameter name=3D"create-session" value=3D"true"/> </map:generate> 2. Here is my generator definition. <map:generator label=3D"content" logger=3D"sitemap.generator.xquery" name=3D"xquerygenerator" src=3D"org.exist.cocoon.XQueryGenerator"/> 3. Here is my flowscript call. cocoon.sendPage("myPage/", {"xqueryStr": javaObj.xQueryString}); 4. I did not get the exception when I edited LocalXPathQueryService.java on line 161: CompiledXQuery compiled =3D pool.borrowCompiledXQuery(broker, source); replacing it with the line: CompiledXQuery compiled =3Dnull; but then eXist will never get the compiled xQuery. I'm not sure what to do other than that. 5. Here is the stack trace, and to reiterate, this works fine the first time and I only get an exception after the first call. java.lang.NullPointerException at org.exist.source.CocoonSource.isValid(CocoonSource.java:70) at org.exist.storage.XQueryPool.borrowCompiledXQuery(XQueryPool.jav= a:119) at org.exist.xmldb.LocalXPathQueryService.execute(LocalXPathQuerySe= rvice.java:161) at org.exist.cocoon.XQueryGenerator.generate(XQueryGenerator.java:2= 64) at org.apache.cocoon.components.pipeline.AbstractProcessingPipeline= .processXMLPipeline(AbstractProcessingPipeline.java:575) 6. Has anyone seen this before? Could there be a more generic cocoon configuration I need to setup in order for this to work? thanks, dan

Re: [Exist-open] Issue with Cocoon Generator, LocalXPathQueryService From: Wolfgang Meier <wolfgangmm@gm...> - 2005-08-25 09:24 Attachments: CocoonSource.patch      Hi, > java.lang.NullPointerException > at org.exist.source.CocoonSource.isValid(CocoonSource.java:70) > at org.exist.storage.XQueryPool.borrowCompiledXQuery(XQueryPool.j= ava:119) I checked the Cocoon sources: Source.getValidity() may indeed return null if the validity of the source is currently unknown. CocoonSource.isValid should thus test for null and return UNKNOWN. But then the query will be recompiled for every call, which is not what we want. I have thus added a fallback, which compares the string contents of the old and the new source object. I'm not sure if this is safe. I hope validity will only be null if the source is passed as a string via the sitemap, so comparing the strings will be cheap. I attach a patch to be applied on org/exist/source/CocoonSource. Wolfgang

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