Re: XPath expression with namespace

Gert Vanthienen Mon, 05 Nov 2007 11:50:46 -0800

Tijs,

Not entirely sure about it, but looking at the code I guess this featurewill only be available with the upcoming 1.3 release of Apache Camel.Could you give it a try with a 1.3 SNAPSHOT (available onhttp://people.apache.org/repo/m2-snapshot-repository/org/apache/camel/apache-camel/1.3-SNAPSHOT/)?


Gert

Tijs wrote:

Hi,

I am using Apache Camel 1.2.0 and I have the following XML configuration:

<beans xmlns="http://www.springframework.org/schema/beans";
       xmlns:ins="http://insurance.com";
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
       http://activemq.apache.org/camel/schema/spring
http://activemq.apache.org/camel/schema/spring/camel-spring.xsd";>

  <camelContext useJmx="true"
xmlns="http://activemq.apache.org/camel/schema/spring";>
    <route>
      <from uri="file:inbox"/>
      <choice>

<when><xpath>//ins:insurance-type='Car'</xpath><to uri="file:outboxCar"/>

        </when>
        <otherwise>
          <to uri="file:outboxTravel"/>
        </otherwise>
      </choice>
    </route>
  </camelContext>
</beans>

I think this XML configuration is correct as it is the same as the XPath
explanation on the Camel website. I however get the following exception:

5-nov-2007 18:03:15 org.apache.camel.processor.Logger log
SEVERE: Invalid xpath: //ins:insurance-type='Car'. Reason:
javax.xml.xpath.XPath
ExpressionException
org.apache.camel.builder.xml.InvalidXPathExpression: Invalid xpath:
//ins:insura
nce-type='Car'. Reason: javax.xml.xpath.XPathExpressionException
        at
org.apache.camel.builder.xml.XPathBuilder.evaluateAs(XPathBuilder.jav
a:383)
        at
org.apache.camel.builder.xml.XPathBuilder.matches(XPathBuilder.java:9
2)
        at
org.apache.camel.builder.xml.XPathBuilder.matches(XPathBuilder.java:5
8)
        at
org.apache.camel.processor.ChoiceProcessor.process(ChoiceProcessor.ja
va:47)
        at
org.apache.camel.processor.DelegateProcessor.processNext(DelegateProc
essor.java:47)
        at
org.apache.camel.processor.DelegateProcessor.process(DelegateProcesso
r.java:42)
        at
org.apache.camel.management.InstrumentationProcessor.process(Instrume
ntationProcessor.java:33)
        at
org.apache.camel.impl.converter.AsyncProcessorTypeConverter$Processor
ToAsynProcessorBridge.process(AsyncProcessorTypeConverter.java:44)
        at
org.apache.camel.processor.DeadLetterChannel.process(DeadLetterChanne
l.java:136)
        at
org.apache.camel.processor.DeadLetterChannel.process(DeadLetterChanne
l.java:86)
        at
org.apache.camel.processor.UnitOfWorkProcessor.process(UnitOfWorkProc
essor.java:40)
        at
org.apache.camel.component.file.FileConsumer.pollFile(FileConsumer.ja
va:131)
        at
org.apache.camel.component.file.FileConsumer.pollFileOrDirectory(File
Consumer.java:68)
        at
org.apache.camel.component.file.FileConsumer.pollFileOrDirectory(File
Consumer.java:76)
        at
org.apache.camel.component.file.FileConsumer.poll(FileConsumer.java:4
9)
        at
org.apache.camel.impl.ScheduledPollConsumer.run(ScheduledPollConsumer
.java:63)
        at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:41
7)
        at
java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java
:280)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:135)
        at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.
access$101(ScheduledThreadPoolExecutor.java:65)
        at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.
runPeriodic(ScheduledThreadPoolExecutor.java:142)
        at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.
run(ScheduledThreadPoolExecutor.java:166)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExec
utor.java:650)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
.java:675)
        at java.lang.Thread.run(Thread.java:595)
Caused by: javax.xml.xpath.XPathExpressionException
        at
com.sun.org.apache.xpath.internal.jaxp.XPathImpl.compile(XPathImpl.ja
va:402)
        at
org.apache.camel.builder.xml.XPathBuilder.createXPathExpression(XPath
Builder.java:405)
        at
org.apache.camel.builder.xml.XPathBuilder.getExpression(XPathBuilder.
java:269)
        at
org.apache.camel.builder.xml.XPathBuilder.evaluateAs(XPathBuilder.jav
a:372)
        ... 24 more
Caused by: javax.xml.transform.TransformerException: Prefix must resolve to
a na
mespace: ins
        at
com.sun.org.apache.xpath.internal.compiler.XPathParser.error(XPathPar
ser.java:602)
        at
com.sun.org.apache.xpath.internal.compiler.Lexer.mapNSTokens(Lexer.ja
va:638)
        at
com.sun.org.apache.xpath.internal.compiler.Lexer.tokenize(Lexer.java:
265)
        at
com.sun.org.apache.xpath.internal.compiler.Lexer.tokenize(Lexer.java:
96)
        at
com.sun.org.apache.xpath.internal.compiler.XPathParser.initXPath(XPat
hParser.java:108)
        at com.sun.org.apache.xpath.internal.XPath.<init>(XPath.java:162)
        at com.sun.org.apache.xpath.internal.XPath.<init>(XPath.java:198)
        at
com.sun.org.apache.xpath.internal.jaxp.XPathImpl.compile(XPathImpl.ja
va:394)
        ... 27 more

Is this a bug or am I doing something wrong here?

Thanks,

Tijs

Re: XPath expression with namespace

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