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https://issues.apache.org/jira/browse/CAMEL-10509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15690103#comment-15690103
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Claus Ibsen commented on CAMEL-10509:
-------------------------------------
For the reverse operation to set namespaces, you grab the namespaces from the
xml, and then do something similar to extractNamespaces but instead of get you
set the namespaces instead on the NamespaceAware instance.
> ManagedCamelContextMBean - additional namespaces are removed
> ------------------------------------------------------------
>
> Key: CAMEL-10509
> URL: https://issues.apache.org/jira/browse/CAMEL-10509
> Project: Camel
> Issue Type: Improvement
> Components: camel-core
> Affects Versions: 2.18.0
> Reporter: Aurelien Pupier
> Fix For: 2.19.0
>
>
> - Use a specific namespace, declared at CamelContext level, in an Xpath
> expression of a When
> something like:
> {noformat}
> <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0";
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xsi:schemaLocation=" http://www.osgi.org/xmlns/blueprint/v1.0.0
> https://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd
> http://camel.apache.org/schema/blueprint
> http://camel.apache.org/schema/blueprint/camel-blueprint.xsd";>
> <!--
> The namespace for the camelContext element in Blueprint is
> 'https://camel.apache.org/schema/blueprint'. Additionally,
> we can also define namespace prefixes we want to use them in the XPath
> expressions in our CBR.
> While it is not required to assign id's to the <camelContext/> and
> <route/> elements, it is a good idea
> to set those for runtime management purposes (logging, JMX MBeans, ...)
> -->
> <camelContext id="cbr-example-context"
> xmlns="http://camel.apache.org/schema/blueprint";
> xmlns:order="http://fabric8.com/examples/order/v7";>
> <!--
> When this route is started, it will automatically create the
> work/cbr/input directory where you can drop the
> file that need to be processed.
> The <log/> elements are used to add human-friendly business logging
> statements. They make it easier to see what the
> route is doing.
> The <choice/> element contains the content based router. The two
> <when/> clauses use XPath to define the criteria
> for entering that part of the route. When the country in the XML
> message is set to UK or US, the file will be
> moved to a directory for that country. The <otherwise/> element
> ensures that any file that does not meet the
> requirements for either of the <when/> elements will be moved to
> the work/cbr/output/others directory.
> -->
> <route id="cbr-route">
> <from id="_from1" uri="file:work/cbr/input"/>
> <log id="_log1" message="Receiving order ${file:name}"/>
> <choice id="_choice1">
> <when id="_when1">
> <xpath
> id="_xpath1">/order:order/order:customer/order:country = 'UK'</xpath>
> <log id="_log2" message="Sending order ${file:name} to
> the UK"/>
> <to id="_to1" uri="file:work/cbr/output/uk"/>
> </when>
> <when id="_when2">
> <xpath
> id="_xpath2">/order:order/order:customer/order:country = 'US'</xpath>
> <log id="_log3" message="Sending order ${file:name} to
> the US"/>
> <to id="_to2" uri="file:work/cbr/output/us"/>
> </when>
> <otherwise id="_otherwise1">
> <log id="_log4" message="Sending order ${file:name} to
> another country"/>
> <to id="_to3" uri="file:work/cbr/output/others"/>
> </otherwise>
> </choice>
> <log id="_log5" message="Done processing ${file:name}"/>
> </route>
> </camelContext>
> </blueprint>
> {noformat}
> - Deploy the project
> - Using MBean retrieve dumpRoutesAsXml is providing a route without the
> additional xml namespace provided
> xmlns:order="http://fabric8.com/examples/order/v7";
> {noformat}
> <?xml version="1.0" encoding="UTF-8"?>
> <routes id="cbr-example-context"
> xmlns="http://camel.apache.org/schema/spring";>
> <route customId="true" id="cbr-route">
> <from customId="true" id="_from1" uri="file:work/cbr/input"/>
> <log customId="true" id="_log1" message="XXXYYY"/>
> <choice customId="true" id="_choice1">
> <when customId="true" id="_when1">
> <xpath id="_xpath1">/order:order/order:customer/order:country
> = 'UK'</xpath>
> <log customId="true" id="_log2" message="Sending order
> ${file:name} to the UK"/>
> <to customId="true" id="_to1" uri="file:work/cbr/output/uk"/>
> </when>
> <when customId="true" id="_when2">
> <xpath id="_xpath2">/order:order/order:customer/order:country
> = 'US'</xpath>
> <log customId="true" id="_log3" message="Sending order
> ${file:name} to the US"/>
> <to customId="true" id="_to2" uri="file:work/cbr/output/us"/>
> </when>
> <otherwise customId="true" id="_otherwise1">
> <log customId="true" id="_log4" message="Sending order
> ${file:name} to another country"/>
> <to customId="true" id="_to3"
> uri="file:work/cbr/output/others"/>
> </otherwise>
> </choice>
> <log customId="true" id="_log5" message="Done processing
> ${file:name}"/>
> </route>
> </routes>
> {noformat}
> - Then use addOrUpdateRoutesFromXml to upload the exact same xml, you will
> get exceptions when the When code is invoked:
> {noformat}
> Message History
> ---------------------------------------------------------------------------------------------------------------------------------------
> RouteId ProcessorId Processor
> Elapsed (ms)
> [cbr-route ] [cbr-route ] [file://work/cbr/input
> ] [ 1]
> [cbr-route ] [_log1 ] [log
> ] [ 0]
> [cbr-route ] [_choice1 ] [when[xpath{XPath:
> /order:order/order:customer/order:country = 'UK'}]choice[whe] [ 1]
> Stacktrace
> ---------------------------------------------------------------------------------------------------------------------------------------
> org.apache.camel.builder.xml.InvalidXPathExpression: Invalid xpath:
> /order:order/order:customer/order:country = 'UK'. Reason:
> javax.xml.xpath.XPathExpressionException:
> com.sun.org.apache.xpath.internal.domapi.XPathStylesheetDOM3Exception: Prefix
> must resolve to a namespace: order
> at
> org.apache.camel.builder.xml.XPathBuilder.evaluateAs(XPathBuilder.java:769)
> at
> org.apache.camel.builder.xml.XPathBuilder.matches(XPathBuilder.java:155)
> at
> org.apache.camel.processor.FilterProcessor.matches(FilterProcessor.java:65)
> at
> org.apache.camel.processor.ChoiceProcessor.process(ChoiceProcessor.java:93)
> at
> org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:77)
> at
> org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:468)
> at
> org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:196)
> at org.apache.camel.processor.Pipeline.process(Pipeline.java:121)
> at org.apache.camel.processor.Pipeline.process(Pipeline.java:83)
> at
> org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:196)
> at
> org.apache.camel.component.file.GenericFileConsumer.processExchange(GenericFileConsumer.java:454)
> at
> org.apache.camel.component.file.GenericFileConsumer.processBatch(GenericFileConsumer.java:226)
> at
> org.apache.camel.component.file.GenericFileConsumer.poll(GenericFileConsumer.java:190)
> at
> org.apache.camel.impl.ScheduledPollConsumer.doRun(ScheduledPollConsumer.java:175)
> at
> org.apache.camel.impl.ScheduledPollConsumer.run(ScheduledPollConsumer.java:102)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: javax.xml.xpath.XPathExpressionException:
> com.sun.org.apache.xpath.internal.domapi.XPathStylesheetDOM3Exception: Prefix
> must resolve to a namespace: order
> at
> com.sun.org.apache.xpath.internal.jaxp.XPathImpl.compile(XPathImpl.java:400)
> at
> org.apache.camel.builder.xml.XPathBuilder.createXPathExpression(XPathBuilder.java:958)
> at
> org.apache.camel.builder.xml.XPathBuilder.evaluateAs(XPathBuilder.java:767)
> ... 21 more
> Caused by:
> com.sun.org.apache.xpath.internal.domapi.XPathStylesheetDOM3Exception: Prefix
> must resolve to a namespace: order
> at
> com.sun.org.apache.xpath.internal.compiler.XPathParser.errorForDOM3(XPathParser.java:657)
> at
> com.sun.org.apache.xpath.internal.compiler.Lexer.mapNSTokens(Lexer.java:642)
> at
> com.sun.org.apache.xpath.internal.compiler.Lexer.tokenize(Lexer.java:269)
> at
> com.sun.org.apache.xpath.internal.compiler.Lexer.tokenize(Lexer.java:100)
> at
> com.sun.org.apache.xpath.internal.compiler.XPathParser.initXPath(XPathParser.java:114)
> at com.sun.org.apache.xpath.internal.XPath.<init>(XPath.java:180)
> at com.sun.org.apache.xpath.internal.XPath.<init>(XPath.java:268)
> at
> com.sun.org.apache.xpath.internal.jaxp.XPathImpl.compile(XPathImpl.java:392)
> {noformat}
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