[jxpath] querying a javamail Message

[Stephan Mikaty <mi...@ecircle-ag.com>]

Hi everyone, 

I've been trying to use xpath expressions against
a javax.mail.internet.MimeMessage with attachments.
Thi allows me to shorten my junit test cases:

JXPathContext ctx = JXPathContext.newContext(message);
assertEquals("text/plain", ctx.getValue("content/bodyPart[0]/contentType"));

I get the following trace:

java.lang.NullPointerException
	at
org.apache.commons.jxpath.util.ValueUtils.getCollectionHint(ValueUtils.java:
112)
	at
org.apache.commons.jxpath.ri.model.beans.BeanPropertyPointer.isCollection(Be
anPropertyPointer.java:201)
	at
org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.isCollectionElement(
SimplePathInterpreter.java:770)
	at
org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.doPredicateIndex(Sim
plePathInterpreter.java:674)
	at
org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.doPredicate(SimplePa
thInterpreter.java:487)
	at
org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.doStepPredicatesProp
ertyOwner(SimplePathInterpreter.java:353)
	at
org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.doStep(SimplePathInt
erpreter.java:194)
	at
org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.doStepNoPredicatesPr
opertyOwner(SimplePathInterpreter.java:276)
	at
org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.doStep(SimplePathInt
erpreter.java:187)
	at
org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.interpretSimpleLocat
ionPath(SimplePathInterpreter.java:122)
	at
org.apache.commons.jxpath.ri.compiler.Path.getSingleNodePointerForSteps(Path
.java:186)
	at
org.apache.commons.jxpath.ri.compiler.LocationPath.computeValue(LocationPath
.java:128)
	at
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.getValue(JXPathConte
xtReferenceImpl.java:287)
	at
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.getValue(JXPathConte
xtReferenceImpl.java:283)


Am i doing something wrong? I looked a the code and tried a few changes,
but couldn't come up with any obvious fix.

Any help appreciated,

Stephane

Re: [jxpath] querying a javamail Message

[Dmitri Plotnikov <dp...@yahoo.com>]

Stephan,

Sorry about the horrible error message.  I'll change it to print
something more comprehensible.

The obvious problem is that you are using 0 instead of 1 to access the
first element of the collection (I know, I know... I hate that too. But
it's XPath standard - what are you gonna do?)

I hope this helps.

- Dmitri


--- Stephan Mikaty <mi...@ecircle-ag.com> wrote:
> Hi everyone, 
> 
> I've been trying to use xpath expressions against
> a javax.mail.internet.MimeMessage with attachments.
> Thi allows me to shorten my junit test cases:
> 
> JXPathContext ctx = JXPathContext.newContext(message);
> assertEquals("text/plain",
> ctx.getValue("content/bodyPart[0]/contentType"));
> 
> I get the following trace:
> 
> java.lang.NullPointerException
> 	at
>
org.apache.commons.jxpath.util.ValueUtils.getCollectionHint(ValueUtils.java:
> 112)
> 	at
>
org.apache.commons.jxpath.ri.model.beans.BeanPropertyPointer.isCollection(Be
> anPropertyPointer.java:201)
> 	at
>
org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.isCollectionElement(
> SimplePathInterpreter.java:770)
> 	at
>
org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.doPredicateIndex(Sim
> plePathInterpreter.java:674)
> 	at
>
org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.doPredicate(SimplePa
> thInterpreter.java:487)
> 	at
>
org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.doStepPredicatesProp
> ertyOwner(SimplePathInterpreter.java:353)
> 	at
>
org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.doStep(SimplePathInt
> erpreter.java:194)
> 	at
>
org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.doStepNoPredicatesPr
> opertyOwner(SimplePathInterpreter.java:276)
> 	at
>
org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.doStep(SimplePathInt
> erpreter.java:187)
> 	at
>
org.apache.commons.jxpath.ri.axes.SimplePathInterpreter.interpretSimpleLocat
> ionPath(SimplePathInterpreter.java:122)
> 	at
>
org.apache.commons.jxpath.ri.compiler.Path.getSingleNodePointerForSteps(Path
> .java:186)
> 	at
>
org.apache.commons.jxpath.ri.compiler.LocationPath.computeValue(LocationPath
> .java:128)
> 	at
>
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.getValue(JXPathConte
> xtReferenceImpl.java:287)
> 	at
>
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.getValue(JXPathConte
> xtReferenceImpl.java:283)
> 
> 
> Am i doing something wrong? I looked a the code and tried a few
> changes,
> but couldn't come up with any obvious fix.
> 
> Any help appreciated,
> 
> Stephane
> 
> ---------------------------------------------------------------------
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> For additional commands, e-mail: commons-user-help@jakarta.apache.org
> 


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