我正在尝试使用 Smooks 调解器转换消息队列中的消息。我按照本教程进行操作： http ://wso2.com/library/tutorials/2011/06/perform-data-mapping-smooks-editor-wso2-carbon-studio/ 但我遇到了这样的错误：
[2015-07-01 06:09:23,986] ERROR - SmooksMediator Failed to filter source.
org.milyn.SmooksException: Failed to filter source.
at org.milyn.delivery.sax.SmooksSAXFilter.doFilter(SmooksSAXFilter.java:97)
at org.milyn.delivery.sax.SmooksSAXFilter.doFilter(SmooksSAXFilter.java:64)
at org.milyn.Smooks._filter(Smooks.java:526)
at org.milyn.Smooks.filterSource(Smooks.java:482)
at org.wso2.carbon.mediator.transform.SmooksMediator.mediate(SmooksMediator.java:123)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:77)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:47)
at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:131)
at org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive(ProxyServiceMessageReceiver.java:166)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
at org.apache.synapse.transport.passthru.ServerWorker.processEntityEnclosingRequest(ServerWorker.java:411)
at org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:183)
at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662) Caused by: java.lang.IllegalArgumentException: prefix cannot be "null" when creating a QName
at javax.xml.namespace.QName.<init>(QName.java:253)
at com.sun.xml.internal.stream.events.XMLEventAllocatorImpl.getQName(XMLEventAllocatorImpl.java:256)
at com.sun.xml.internal.stream.events.XMLEventAllocatorImpl.getXMLEvent(XMLEventAllocatorImpl.java:78)
at com.sun.xml.internal.stream.events.XMLEventAllocatorImpl.allocate(XMLEventAllocatorImpl.java:55)
at com.sun.xml.internal.stream.XMLEventReaderImpl.nextEvent(XMLEventReaderImpl.java:86)
at com.sun.xml.internal.stream.XMLEventReaderImpl.next(XMLEventReaderImpl.java:250)
at org.wso2.carbon.mediator.transform.stream.IOElementPipe.populateEvents(IOElementPipe.java:90)
at org.wso2.carbon.mediator.transform.stream.IOElementPipe.getData(IOElementPipe.java:68)
at org.wso2.carbon.mediator.transform.stream.ElementInputStream.read(ElementInputStream.java:61)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:264)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:306)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:158)
at java.io.InputStreamReader.read(InputStreamReader.java:167)
at org.apache.xerces.impl.XMLEntityScanner.load(Unknown Source)
at org.apache.xerces.impl.XMLEntityScanner.skipString(Unknown Source)
at org.apache.xerces.impl.XMLVersionDetector.determineDocVersion(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.milyn.delivery.sax.SAXParser.parse(SAXParser.java:76)
at org.milyn.delivery.sax.SmooksSAXFilter.doFilter(SmooksSAXFilter.java:86)
... 15 more
[2015-07-01 06:09:23,986] ERROR - NativeWorkerPool Uncaught exceptionorg.wso2.carbon.mediator.service.MediatorException: Failed to filter source. Caused by Failed to filter source.
at org.wso2.carbon.mediator.transform.SmooksMediator.handleException(SmooksMediator.java:242)
at org.wso2.carbon.mediator.transform.SmooksMediator.mediate(SmooksMediator.java:137)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:77)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:47)
at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:131)
at org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive(ProxyServiceMessageReceiver.java:166)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
at org.apache.synapse.transport.passthru.ServerWorker.processEntityEnclosingRequest(ServerWorker.java:411)
at org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:183)
at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
我的 inSequence 定义如下：
<inSequence>
<log level="custom" separator=" == ">
<property name="StartingLogging" value="------ STARTING PS ------"/>
</log>
<property name="message" expression="/" scope="default" type="STRING"/>
<log level="custom">
<property name="Message" expression="$ctx:message"/>
</log>
<payloadFactory media-type="xml">
<format>
<GeoRequest xmlns="">
<lat>$1</lat>
<long>$2</long>
</GeoRequest>
</format>
<args>
<arg xmlns:p="http://www.example.org/NewWSDLFile/"
evaluator="xml"
expression="$body/p:GeoRequest/lat/text()"/>
<arg xmlns:p="http://www.example.org/NewWSDLFile/"
evaluator="xml"
expression="$body/p:GeoRequest/long/text()"/>
</args>
</payloadFactory>
<log level="full"/>
<smooks config-key="conf:smooks/DemoRequestTransform.xml">
<input type="xml"/>
<output type="xml" expression="$body/GeoRequest" action="replace"/>
</smooks>
<log level="full" separator=" *** "/>
<send>
<endpoint key="DemoGeoService"/>
</send>
</inSequence>
这是我的 Smooks 配置：
<?xml version="1.0" encoding="UTF-8"?><smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd" xmlns:ftl="http://www.milyn.org/xsd/smooks/freemarker-1.1.xsd">
<params>
<param name="stream.filter.type">SAX</param>
<param name="inputType">input.xml</param>
<param name="input.xml" type="input.type.actived">file://E:\WSO2\workspace\DemoRegistryResources\RequestInputModel.xml</param>
</params>
<ftl:freemarker applyOnElement="#document">
<ftl:template><![CDATA[<?xml version="1.0" encoding="UTF-8"?>
<geo:getZipCode xmlns:geo="http://geo.wso2">
<geo:latitude>${.vars["Geolocation"]["lat"]}</geo:latitude>
<geo:longitude>${.vars["Geolocation"]["long"]}</geo:longitude>
</geo:getZipCode>]]></ftl:template>
<param name="modelSrc">file://E:\WSO2\workspace\DemoRegistryResources\RequetsOutputModel.xml</param>
<param name="modelSrcType">XML</param>
<param name="messageType">XML</param>
<param name="templateDataProvider">input</param>
</ftl:freemarker>
<resource-config selector="#document">
<resource>org.milyn.delivery.DomModelCreator</resource>
</resource-config>
</smooks-resource-list>
Smooks 的配置有问题吗？
我对配置文件的标签“param”中的参数感到困惑。是否有必要将其上传到注册表？
你能给我一些建议来解决这个问题，或者给我一些用 Smooks 转换消息以进行 xml-to-xml-transformation 的方法吗？
谢谢，