Camel Loop Xpath Expression
Has anyone tried setting up XPath expression for the loop counter?
The following camel route does not seem to work for me and I am assuming that the expression has to return a number for the loop counter:
<?xml version="1.0" encoding="ASCII"?>
<routes xmlns="http://camel.apache.org/schema/spring">
<route>
<from uri="switchyard://TrnsformationService"/>
<log message="TrnsformationService - message received: ${body}" loggingLevel="TRACE"/>
<loop>
<xpath>count(//*[local-name()='Site'])</xpath>
<to uri="xslt:SitesToLocations.xsl"/>
<log message="TrnsformationService - message trasformed: ${body}" loggingLevel="TRACE"/>
</loop>
</route>
</routes>
The incoming message is quite simple:
<?xml version="1.0" encoding="UTF-8"?>
<Sites xmlns="urn://abc.com/site">
<Site>
<code>123</code>
<name>Cool-Site 1</name>
<description>This is the cool site #1.</description>
</Site>
<Site xmlns="urn://nrel.gov/site">
<code>1234</code>
<name>Cool-Site 2</name>
<description>This is the cool site #2.</description>
</Site>
</Sites>
When run, the exception shown below gets thrown from the junit. The cause is indicated as:
Caused by: com.sun.org.apache.xpath.internal.XPathException: Can not convert #NUMBER to a NodeList!
I would expect that the route needs a number to set up the loop counter.
If I just select the nodes and remove the count() function it does not work either as number format exception is thrown:
Caused by: org.apache.camel.RuntimeCamelException: java.lang.NumberFormatException: For input string: "<Site ...
This project is using 2.0.0.Final of switchyard and 2.14.4 of camel-core (pom.xml is attached).
org.switchyard.test.InvocationFaultException
at org.switchyard.test.Invoker.sendInOut(Invoker.java:325)
at com.example.switchyard.TrnsformationServiceTest.testTransformIt(TrnsformationServiceTest.java:43)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.switchyard.test.SwitchYardRunner.run(SwitchYardRunner.java:85)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: org.switchyard.HandlerException: org.apache.camel.builder.xml.InvalidXPathExpression: Invalid xpath: count(//*[local-name()='Site']). Reason: javax.xml.xpath.XPathExpressionException
at org.switchyard.component.camel.switchyard.SwitchYardConsumer.invokeCamelProcessor(SwitchYardConsumer.java:184)
at org.switchyard.component.camel.switchyard.SwitchYardConsumer.handleMessage(SwitchYardConsumer.java:96)
at org.switchyard.handlers.ProviderHandler$1.run(ProviderHandler.java:60)
at org.switchyard.handlers.ProviderHandler$1.run(ProviderHandler.java:58)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAsPrivileged(Subject.java:536)
at org.switchyard.security.provider.DefaultSecurityProvider.runAs(DefaultSecurityProvider.java:169)
at org.switchyard.handlers.ProviderHandler.handleMessage(ProviderHandler.java:65)
at org.switchyard.bus.camel.processors.HandlerProcessor.process(HandlerProcessor.java:61)
at org.apache.camel.processor.DelegateSyncProcessor.process(DelegateSyncProcessor.java:63)
at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:72)
at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:91)
at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:91)
at org.switchyard.bus.camel.audit.FaultProcessor.process(FaultProcessor.java:45)
at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:91)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:191)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:118)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:80)
at org.apache.camel.processor.TryProcessor.process(TryProcessor.java:111)
at org.apache.camel.processor.TryProcessor.process(TryProcessor.java:82)
at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:72)
at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:91)
at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:91)
at org.switchyard.bus.camel.audit.FaultProcessor.process(FaultProcessor.java:45)
at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:91)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:191)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:191)
at org.apache.camel.component.direct.DirectProducer.process(DirectProducer.java:51)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:191)
at org.apache.camel.processor.UnitOfWorkProducer.process(UnitOfWorkProducer.java:74)
at org.apache.camel.impl.ProducerCache$2.doInProducer(ProducerCache.java:375)
at org.apache.camel.impl.ProducerCache$2.doInProducer(ProducerCache.java:343)
at org.apache.camel.impl.ProducerCache.doInProducer(ProducerCache.java:233)
at org.apache.camel.impl.ProducerCache.sendExchange(ProducerCache.java:343)
at org.apache.camel.impl.ProducerCache.send(ProducerCache.java:168)
at org.apache.camel.impl.DefaultProducerTemplate.send(DefaultProducerTemplate.java:119)
at org.apache.camel.impl.DefaultProducerTemplate.send(DefaultProducerTemplate.java:105)
at org.switchyard.bus.camel.ExchangeDispatcher.dispatch(ExchangeDispatcher.java:87)
at org.switchyard.bus.camel.CamelExchange.sendInternal(CamelExchange.java:238)
at org.switchyard.bus.camel.CamelExchange.send(CamelExchange.java:175)
at org.switchyard.test.Invoker.sendInOut(Invoker.java:320)
... 25 more
Caused by: org.apache.camel.builder.xml.InvalidXPathExpression: Invalid xpath: count(//*[local-name()='Site']). Reason: javax.xml.xpath.XPathExpressionException
at org.apache.camel.builder.xml.XPathBuilder.doInEvaluateAs(XPathBuilder.java:910)
at org.apache.camel.builder.xml.XPathBuilder.evaluateAs(XPathBuilder.java:774)
at org.apache.camel.builder.xml.XPathBuilder.evaluate(XPathBuilder.java:744)
at org.apache.camel.builder.xml.XPathBuilder.evaluate(XPathBuilder.java:167)
at org.apache.camel.processor.LoopProcessor.process(LoopProcessor.java:54)
at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:72)
at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:398)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:191)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:118)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:80)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:191)
at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:105)
at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:87)
at org.switchyard.component.camel.switchyard.SwitchYardConsumer.invokeCamelProcessor(SwitchYardConsumer.java:182)
... 65 more
Caused by: javax.xml.xpath.XPathExpressionException
at com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.java:200)
at org.apache.camel.builder.xml.XPathBuilder.doInEvaluateAs(XPathBuilder.java:892)
... 78 more
Caused by: com.sun.org.apache.xpath.internal.XPathException: Can not convert #NUMBER to a NodeList!
at com.sun.org.apache.xpath.internal.objects.XObject.error(XObject.java:711)
at com.sun.org.apache.xpath.internal.objects.XObject.nodelist(XObject.java:457)
at com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.getResultAsType(XPathExpressionImpl.java:360)
at com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.eval(XPathExpressionImpl.java:106)
at com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.java:187)
... 79 more
Any insight is much appreciated
/Tomasz
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pom.xml.zip 881 bytes
