Having trouble with content based routing in Camel with a CXFRS endpoint and xPath - xpath

Question

I am trying to create a route that is determined by the content in the REST payload using xPath. I have been successful in using routing based on the message header:
<when>
<simple>${headers.operationName} == 'createContainerOutput'</simple>
<bean ref="containerOutputProcessor"/>
</when>
which properly invokes the containerOutputProcessor...
but for this xPath route:
<when>
<xpath>/*[local-name()='order-request']/#type='TrayOutput'</xpath>
<bean ref="containerOutputProcessor"/>
</when>
I get the the exception:
org.apache.camel.NoTypeConversionAvailableException: No type converter available to convert from type: org.apache.cxf.message.MessageContentsList to the required type: org.w3c.dom.Document with value [com.mmi.ws.ContainerOutputOrderRequest#6290dc]
for this payload
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<order-request type="TrayOutput">
<parameter name="orderName">Example Tray Output Order</parameter>
<parameter name="enableScan">true</parameter>
<parameter name="autoStart">false</parameter>
<parameter name="priority">3</parameter>
<item barcode="23990001"/>
<item barcode="23990002"/>
</order-request>
Is this type of routing a good idea? Is there a better way to route based on what type of order-request is being submitted?
Thanks for any help/guidance you may have for me!
Here is the complete context
<?xml version='1.0' encoding='UTF-8'?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:jaxrs="http://cxf.apache.org/jaxrs"
xmlns:cxf="http://camel.apache.org/schema/cxf"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd
http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd
http://cxf.apache.org/jaxrs http://cxf.apache.org/schemas/jaxrs.xsd
http://camel.apache.org/schema/cxf http://camel.apache.org/schema/cxf/camel-cxf.xsd">
<!-- enable Spring #Component scan -->
<context:component-scan base-package="com.mmi.ws"/>
<!-- web service beans -->
<bean id="containerOutputWS" class="com.mmi.ws.service.impl.ContainerOutputWSImpl" />
<bean id="containerTypesWS" class="com.mmi.ws.service.impl.ContainerTypesWSImpl" />
<!-- processor beans -->
<bean id="containerOutputProcessor" class="com.mmi.ws.service.ContainerOutputProcessor" />
<bean id="containerTypesProcessor" class="com.mmi.ws.service.ContainerTypesProcessor" />
<bean id="unsupportedPathProcessor" class="com.mmi.ws.service.UnsupportedPathProcessor" />
<!-- Define the real JAXRS back end service -->
<jaxrs:server id="restService"
address="http://localhost:9998/sc"
staticSubresourceResolution="true">
<jaxrs:serviceBeans>
<ref bean="containerOutputWS"/>
<ref bean="containerTypesWS"/>
</jaxrs:serviceBeans>
</jaxrs:server>
<!-- define the restful server and client endpoints -->
<cxf:rsServer id="rsServer" address="http://localhost:9999/sc" loggingFeatureEnabled="true" loggingSizeLimit="20">
<cxf:serviceBeans >
<ref bean="containerOutputWS"/>
<ref bean="containerTypesWS"/>
</cxf:serviceBeans>
</cxf:rsServer>
<cxf:rsServer id="rsClient" address="http://localhost:9998/sc" loggingFeatureEnabled="true" loggingSizeLimit="20">
<cxf:serviceBeans >
<ref bean="containerOutputWS"/>
<ref bean="containerTypesWS"/>
</cxf:serviceBeans>
</cxf:rsServer>
<camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">
<!--
any classes in the below 'packageScan'packages that extends RouteBuilder
will be added as a camel route. At least one route is required to start the cxf web service
-->
<packageScan>
<package>com.mmi.ws</package>
</packageScan>
<dataFormats>
<xstream id="xstream-utf8" encoding="UTF-8"/>
<xstream id="xstream-default"/>
</dataFormats>
<!-- route starts from the cxf webservice -->
<route streamCache="true">
<from uri="cxfrs://bean://rsServer"/>
<log message="XML payload to send to REST WS:${body}" />
<setHeader headerName="CamelCxfRsUsingHttpAPI"><constant>True</constant> </setHeader>
<choice>
<when>
<simple>${headers.operationName} == 'getContainers'</simple>
<bean ref="containerTypesProcessor"/>
</when>
<when>
<xpath>/*[local-name()='order-request']/#type='TrayOutput'</xpath>
<bean ref="containerOutputProcessor"/>
</when>
<otherwise>
<bean ref="unsupportedPathProcessor"/>
<to uri="cxfrs://bean://rsClient"/>
</otherwise>
</choice>
</route>
</camelContext>
</beans>
and the web service class:
#Path("/container/output/")
public class ContainerOutputWSImpl
{
#POST
#Produces({ MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON })
#Consumes({ MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON })
public ContainerOutputView createContainerOutput(ContainerOutputOrderRequest containerOutput) {
// TODO Auto-generated method stub
return new ContainerOutputView();
}
}
and finally, the xml payload and error stack:
Address: http://localhost:9999/sc/container/output/
Encoding: ISO-8859-1
Http-Method: POST
Content-Type: application/xml
Headers: {accept-encoding=[gzip,deflate], connection=[keep-alive], Content-Length=[384], content-type=[application/xml], Host=[localhost:9999], User-Agent=[Apache-HttpClient/4.1.1 (java 1.5)]}
Payload: <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<order-request type="TrayOutput">
<parameter name="orderName">Example Tray Output Order</parameter>
<parameter name="enableScan">true</parameter>
<parameter name="autoStart">false</parameter>
<parameter name="priority">3</parameter>
<item barcode="23990001"/>
<item barcode="23990002"/>
</order-request>
--------------------------------------
[ERROR] 2013-02-07 17:53:37.059 [qtp27633254-28: DefaultErrorHandler] Failed delivery for (MessageId: ID-PWY-EHANSEN-3070-1360288389778-0-2 on ExchangeId: ID-PWY-EHANSEN-3070-1360288389778-0-1). Exhausted after delivery attempt: 1 caught: org.apache.camel.RuntimeCamelException: org.apache.camel.NoTypeConversionAvailableException: No type converter available to convert from type: org.apache.cxf.message.MessageContentsList to the required type: org.w3c.dom.Document with value [com.mmi.ws.ContainerOutputOrderRequest#9fbbe5]
org.apache.camel.RuntimeCamelException: org.apache.camel.NoTypeConversionAvailableException: No type converter available to convert from type: org.apache.cxf.message.MessageContentsList to the required type: org.w3c.dom.Document with value [com.mmi.ws.ContainerOutputOrderRequest#9fbbe5]
at org.apache.camel.util.ObjectHelper.wrapRuntimeCamelException(ObjectHelper.java:1271)
at org.apache.camel.builder.xml.XPathBuilder.getDocument(XPathBuilder.java:1027)
at org.apache.camel.builder.xml.XPathBuilder.doInEvaluateAs(XPathBuilder.java:850)
at org.apache.camel.builder.xml.XPathBuilder.evaluateAs(XPathBuilder.java:757)
at org.apache.camel.builder.xml.XPathBuilder.matches(XPathBuilder.java:145)
at org.apache.camel.processor.ChoiceProcessor.process(ChoiceProcessor.java:66)
at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73)
at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:99)
at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90)
at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:73)
at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73)
at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:99)
at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90)
at org.apache.camel.processor.interceptor.TraceInterceptor.process(TraceInterceptor.java:91)
at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73)
at org.apache.camel.processor.RedeliveryErrorHandler.processErrorHandler(RedeliveryErrorHandler.java:334)
at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:220)
at org.apache.camel.processor.interceptor.StreamCachingInterceptor.process(StreamCachingInterceptor.java:52)
at org.apache.camel.processor.RouteContextProcessor.processNext(RouteContextProcessor.java:45)
at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90)
at org.apache.camel.processor.interceptor.DefaultChannel.process(DefaultChannel.java:303)
at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:117)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:80)
at org.apache.camel.processor.RouteContextProcessor.processNext(RouteContextProcessor.java:45)
at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90)
at org.apache.camel.processor.UnitOfWorkProcessor.processAsync(UnitOfWorkProcessor.java:150)
at org.apache.camel.processor.UnitOfWorkProcessor.process(UnitOfWorkProcessor.java:117)
at org.apache.camel.processor.RouteInflightRepositoryProcessor.processNext(RouteInflightRepositoryProcessor.java:48)
at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90)
at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73)
at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:99)
at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90)
at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:73)
at org.apache.camel.component.cxf.jaxrs.CxfRsInvoker.asyncInvoke(CxfRsInvoker.java:87)
at org.apache.camel.component.cxf.jaxrs.CxfRsInvoker.performInvocation(CxfRsInvoker.java:57)
at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:96)
at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:201)
at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:102)
at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:58)
at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:94)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:271)
at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121)
at org.apache.cxf.transport.http_jetty.JettyHTTPDestination.serviceRequest(JettyHTTPDestination.java:355)
at org.apache.cxf.transport.http_jetty.JettyHTTPDestination.doService(JettyHTTPDestination.java:319)
at org.apache.cxf.transport.http_jetty.JettyHTTPHandler.handle(JettyHTTPHandler.java:72)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1074)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1010)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:365)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:485)
at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:937)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:998)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:856)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:627)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:51)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Thread.java:722)

Answer 1

Before the content based router, you can convert the message to take out the payload from the internal CXF list. There is a trick with the simple language to grab the first index from the list:
<transform>
<simple>${body[0]}</simple>
</transform>
<choice>
...
Do you have camel-jaxb on the classpath. If so it may work out of the box without that trick. Not sure though, as CXF is a bit special. Also dependes on what version of Camel / CXF you use. You should really mention this when you ask questions!