xpath-node evaluator throws an exception if the input type is org.w3c.dom.Document

• User impact:

  Medium
• Configuration:

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  <?xml version="1.0" encoding="UTF-8"?>
  <mule xmlns="http://www.mulesource.org/schema/mule/core/2.2"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:spring="http://www.springframework.org/schema/beans"
  xmlns:vm="http://www.mulesource.org/schema/mule/vm/2.2"
  xmlns:mxml="http://www.mulesource.org/schema/mule/xml/2.2"
  xsi:schemaLocation="
  http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
  http://www.mulesource.org/schema/mule/core/2.2 http://www.mulesource.org/schema/mule/core/2.2/mule.xsd
  http://www.mulesource.org/schema/mule/vm/2.2 http://www.mulesource.org/schema/mule/vm/2.2/mule-vm.xsd
  http://www.mulesource.org/schema/mule/xml/2.2 http://www.mulesource.org/schema/mule/xml/2.2/mule-xml.xsd">

  <mxml:namespace-manager>
  <mxml:namespace uri="http://ricston.com/" prefix="r"/>
  </mxml:namespace-manager>

  <mxml:xml-to-dom-transformer name="xmlToDomDocumentTransformer" returnClass="org.w3c.dom.Document"/>

  <model>

  <service name="testService">
  <inbound>
  <vm:inbound-endpoint path="test" synchronous="true">
  <transformers>
  <transformer ref="xmlToDomDocumentTransformer"/>
  <expression-transformer>
  <return-argument custom-evaluator="xpath-node" expression="//r:sayHello" evaluator="custom"/>
  </expression-transformer>
  </transformers>
  </vm:inbound-endpoint>
  </inbound>

  </service>
  </model>
  </mule>

  Show

  <?xml version="1.0" encoding="UTF-8"?> <mule xmlns="http://www.mulesource.org/schema/mule/core/2.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:spring="http://www.springframework.org/schema/beans" xmlns:vm="http://www.mulesource.org/schema/mule/vm/2.2" xmlns:mxml="http://www.mulesource.org/schema/mule/xml/2.2" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.mulesource.org/schema/mule/core/2.2 http://www.mulesource.org/schema/mule/core/2.2/mule.xsd http://www.mulesource.org/schema/mule/vm/2.2 http://www.mulesource.org/schema/mule/vm/2.2/mule-vm.xsd http://www.mulesource.org/schema/mule/xml/2.2 http://www.mulesource.org/schema/mule/xml/2.2/mule-xml.xsd"> <mxml:namespace-manager> <mxml:namespace uri="http://ricston.com/" prefix="r"/> </mxml:namespace-manager> <mxml:xml-to-dom-transformer name="xmlToDomDocumentTransformer" returnClass="org.w3c.dom.Document"/> <model> <service name="testService"> <inbound> <vm:inbound-endpoint path="test" synchronous="true"> <transformers> <transformer ref="xmlToDomDocumentTransformer"/> <expression-transformer> <return-argument custom-evaluator="xpath-node" expression="//r:sayHello" evaluator="custom"/> </expression-transformer> </transformers> </vm:inbound-endpoint> </inbound> </service> </model> </mule>
• Log Output:

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  [04-05 13:11:33] ERROR DefaultServiceExceptionStrategy [main]:
  ********************************************************************************
  Message : Failed to invoke org.mule.component.simple.PassThroughComponent component for: SedaService{testService}. Component that caused exception is: SedaService{testService}. Message payload is of type: DocumentImpl
  Type : org.mule.api.service.ServiceException
  Code : MULE_ERROR--2
  Payload : [#document: null]
  JavaDoc : http://www.mulesource.org/docs/site/current2/apidocs/org/mule/api/service/ServiceException.html
  ********************************************************************************
  Exception stack is:
  1. WRONG_DOCUMENT_ERR: A node is used in a different document than the one that created it. (org.w3c.dom.DOMException)
  com.sun.org.apache.xerces.internal.dom.ParentNode:352 (null)
  2. Failed to evaluate XPath expression: "//r:sayHello" (org.mule.api.MuleRuntimeException)
  org.mule.module.xml.expression.AbstractXPathExpressionEvaluator:93 (http://www.mulesource.org/docs/site/current2/apidocs/org/mule/api/MuleRuntimeException.html)
  3. Failed to invoke org.mule.component.simple.PassThroughComponent component for: SedaService{testService}. Component that caused exception is: SedaService{testService}. Message payload is of type: DocumentImpl (org.mule.api.service.ServiceException)
  org.mule.component.AbstractComponent:152 (http://www.mulesource.org/docs/site/current2/apidocs/org/mule/api/service/ServiceException.html)
  ********************************************************************************
  
  Root Exception stack trace:
  org.w3c.dom.DOMException: WRONG_DOCUMENT_ERR: A node is used in a different document than the one that created it.
  at com.sun.org.apache.xerces.internal.dom.ParentNode.internalInsertBefore(ParentNode.java:352)
  at com.sun.org.apache.xerces.internal.dom.ParentNode.insertBefore(ParentNode.java:284)
  at com.sun.org.apache.xerces.internal.dom.CoreDocumentImpl.insertBefore(CoreDocumentImpl.java:389)
  at com.sun.org.apache.xerces.internal.dom.NodeImpl.appendChild(NodeImpl.java:235)
  at org.mule.module.xml.expression.XPathNodeExpressionEvaluator.extractResultFromNode(XPathNodeExpressionEvaluator.java:57)
  at org.mule.module.xml.expression.AbstractXPathExpressionEvaluator.extractResultsFromNodes(AbstractXPathExpressionEvaluator.java:142)
  at org.mule.module.xml.expression.AbstractXPathExpressionEvaluator.evaluate(AbstractXPathExpressionEvaluator.java:77)
  at org.mule.expression.DefaultExpressionManager.evaluate(DefaultExpressionManager.java:170)
  at org.mule.expression.transformers.ExpressionArgument.evaluate(ExpressionArgument.java:115)
  at org.mule.expression.transformers.ExpressionTransformer.transform(ExpressionTransformer.java:52)
  at org.mule.transformer.AbstractMessageAwareTransformer.doTransform(AbstractMessageAwareTransformer.java:68)
  at org.mule.transformer.AbstractTransformer.transform(AbstractTransformer.java:254)
  at org.mule.DefaultMuleMessage.applyAllTransformers(DefaultMuleMessage.java:645)
  at org.mule.DefaultMuleMessage.applyTransformers(DefaultMuleMessage.java:606)
  at org.mule.DefaultMuleMessage.applyTransformers(DefaultMuleMessage.java:599)
  at org.mule.DefaultMuleEvent.transformMessage(DefaultMuleEvent.java:328)
  at org.mule.DefaultMuleEvent.transformMessage(DefaultMuleEvent.java:323)
  at org.mule.component.simple.PassThroughComponent.doInvoke(PassThroughComponent.java:27)
  at org.mule.component.AbstractComponent.invokeInternal(AbstractComponent.java:133)
  at org.mule.component.AbstractComponent.invoke(AbstractComponent.java:161)
  at org.mule.service.AbstractService.invokeComponent(AbstractService.java:921)
  at org.mule.model.seda.SedaService.doSend(SedaService.java:256)
  at org.mule.service.AbstractService.sendEvent(AbstractService.java:499)
  at org.mule.DefaultMuleSession.sendEvent(DefaultMuleSession.java:359)
  at org.mule.routing.inbound.DefaultInboundRouterCollection.send(DefaultInboundRouterCollection.java:228)
  at org.mule.routing.inbound.DefaultInboundRouterCollection.route(DefaultInboundRouterCollection.java:188)
  at org.mule.transport.AbstractMessageReceiver$DefaultInternalMessageListener.onMessage(AbstractMessageReceiver.java:382)
  at org.mule.transport.AbstractMessageReceiver.routeMessage(AbstractMessageReceiver.java:258)
  at org.mule.transport.AbstractMessageReceiver.routeMessage(AbstractMessageReceiver.java:203)
  at org.mule.transport.AbstractMessageReceiver.routeMessage(AbstractMessageReceiver.java:177)
  at org.mule.transport.vm.VMMessageReceiver.onCall(VMMessageReceiver.java:107)
  at org.mule.transport.vm.VMMessageDispatcher$2.doInTransaction(VMMessageDispatcher.java:133)
  at org.mule.transaction.TransactionTemplate.execute(TransactionTemplate.java:117)
  at org.mule.transport.vm.VMMessageDispatcher.doSend(VMMessageDispatcher.java:136)
  at org.mule.transport.AbstractMessageDispatcher.send(AbstractMessageDispatcher.java:167)
  at org.mule.transport.AbstractConnector.send(AbstractConnector.java:2167)
  at org.mule.endpoint.DefaultOutboundEndpoint.send(DefaultOutboundEndpoint.java:97)
  at org.mule.DefaultMuleSession.sendEvent(DefaultMuleSession.java:332)
  at org.mule.module.client.MuleClient.send(MuleClient.java:649)
  at org.mule.module.client.MuleClient.send(MuleClient.java:595)
  at com.ricston.w3c.W3CDocumentXPathNodeEvaluatorTestCase.testW3CDocument(W3CDocumentXPathNodeEvaluatorTestCase.java:23)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:597)
  at junit.framework.TestCase.runTest(TestCase.java:168)
  at junit.framework.TestCase.runBare(TestCase.java:134)
  at org.mule.tck.AbstractMuleTestCase.runBare(AbstractMuleTestCase.java:287)
  at junit.framework.TestResult$1.protect(TestResult.java:110)
  at junit.framework.TestResult.runProtected(TestResult.java:128)
  at junit.framework.TestResult.run(TestResult.java:113)
  at junit.framework.TestCase.run(TestCase.java:124)
  at org.mule.tck.AbstractMuleTestCase.run(AbstractMuleTestCase.java:266)
  at junit.framework.TestSuite.runTest(TestSuite.java:232)
  at junit.framework.TestSuite.run(TestSuite.java:227)
  at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:79)
  at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
  at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecut...
  
  ********************************************************************************

  Show

  [04-05 13:11:33] ERROR DefaultServiceExceptionStrategy [main]: ******************************************************************************** Message : Failed to invoke org.mule.component.simple.PassThroughComponent component for: SedaService{testService}. Component that caused exception is: SedaService{testService}. Message payload is of type: DocumentImpl Type : org.mule.api.service.ServiceException Code : MULE_ERROR--2 Payload : [#document: null] JavaDoc : http://www.mulesource.org/docs/site/current2/apidocs/org/mule/api/service/ServiceException.html ******************************************************************************** Exception stack is: 1. WRONG_DOCUMENT_ERR: A node is used in a different document than the one that created it. (org.w3c.dom.DOMException) com.sun.org.apache.xerces.internal.dom.ParentNode:352 (null) 2. Failed to evaluate XPath expression: "//r:sayHello" (org.mule.api.MuleRuntimeException) org.mule.module.xml.expression.AbstractXPathExpressionEvaluator:93 (http://www.mulesource.org/docs/site/current2/apidocs/org/mule/api/MuleRuntimeException.html) 3. Failed to invoke org.mule.component.simple.PassThroughComponent component for: SedaService{testService}. Component that caused exception is: SedaService{testService}. Message payload is of type: DocumentImpl (org.mule.api.service.ServiceException) org.mule.component.AbstractComponent:152 (http://www.mulesource.org/docs/site/current2/apidocs/org/mule/api/service/ServiceException.html) ******************************************************************************** Root Exception stack trace: org.w3c.dom.DOMException: WRONG_DOCUMENT_ERR: A node is used in a different document than the one that created it. at com.sun.org.apache.xerces.internal.dom.ParentNode.internalInsertBefore(ParentNode.java:352) at com.sun.org.apache.xerces.internal.dom.ParentNode.insertBefore(ParentNode.java:284) at com.sun.org.apache.xerces.internal.dom.CoreDocumentImpl.insertBefore(CoreDocumentImpl.java:389) at com.sun.org.apache.xerces.internal.dom.NodeImpl.appendChild(NodeImpl.java:235) at org.mule.module.xml.expression.XPathNodeExpressionEvaluator.extractResultFromNode(XPathNodeExpressionEvaluator.java:57) at org.mule.module.xml.expression.AbstractXPathExpressionEvaluator.extractResultsFromNodes(AbstractXPathExpressionEvaluator.java:142) at org.mule.module.xml.expression.AbstractXPathExpressionEvaluator.evaluate(AbstractXPathExpressionEvaluator.java:77) at org.mule.expression.DefaultExpressionManager.evaluate(DefaultExpressionManager.java:170) at org.mule.expression.transformers.ExpressionArgument.evaluate(ExpressionArgument.java:115) at org.mule.expression.transformers.ExpressionTransformer.transform(ExpressionTransformer.java:52) at org.mule.transformer.AbstractMessageAwareTransformer.doTransform(AbstractMessageAwareTransformer.java:68) at org.mule.transformer.AbstractTransformer.transform(AbstractTransformer.java:254) at org.mule.DefaultMuleMessage.applyAllTransformers(DefaultMuleMessage.java:645) at org.mule.DefaultMuleMessage.applyTransformers(DefaultMuleMessage.java:606) at org.mule.DefaultMuleMessage.applyTransformers(DefaultMuleMessage.java:599) at org.mule.DefaultMuleEvent.transformMessage(DefaultMuleEvent.java:328) at org.mule.DefaultMuleEvent.transformMessage(DefaultMuleEvent.java:323) at org.mule.component.simple.PassThroughComponent.doInvoke(PassThroughComponent.java:27) at org.mule.component.AbstractComponent.invokeInternal(AbstractComponent.java:133) at org.mule.component.AbstractComponent.invoke(AbstractComponent.java:161) at org.mule.service.AbstractService.invokeComponent(AbstractService.java:921) at org.mule.model.seda.SedaService.doSend(SedaService.java:256) at org.mule.service.AbstractService.sendEvent(AbstractService.java:499) at org.mule.DefaultMuleSession.sendEvent(DefaultMuleSession.java:359) at org.mule.routing.inbound.DefaultInboundRouterCollection.send(DefaultInboundRouterCollection.java:228) at org.mule.routing.inbound.DefaultInboundRouterCollection.route(DefaultInboundRouterCollection.java:188) at org.mule.transport.AbstractMessageReceiver$DefaultInternalMessageListener.onMessage(AbstractMessageReceiver.java:382) at org.mule.transport.AbstractMessageReceiver.routeMessage(AbstractMessageReceiver.java:258) at org.mule.transport.AbstractMessageReceiver.routeMessage(AbstractMessageReceiver.java:203) at org.mule.transport.AbstractMessageReceiver.routeMessage(AbstractMessageReceiver.java:177) at org.mule.transport.vm.VMMessageReceiver.onCall(VMMessageReceiver.java:107) at org.mule.transport.vm.VMMessageDispatcher$2.doInTransaction(VMMessageDispatcher.java:133) at org.mule.transaction.TransactionTemplate.execute(TransactionTemplate.java:117) at org.mule.transport.vm.VMMessageDispatcher.doSend(VMMessageDispatcher.java:136) at org.mule.transport.AbstractMessageDispatcher.send(AbstractMessageDispatcher.java:167) at org.mule.transport.AbstractConnector.send(AbstractConnector.java:2167) at org.mule.endpoint.DefaultOutboundEndpoint.send(DefaultOutboundEndpoint.java:97) at org.mule.DefaultMuleSession.sendEvent(DefaultMuleSession.java:332) at org.mule.module.client.MuleClient.send(MuleClient.java:649) at org.mule.module.client.MuleClient.send(MuleClient.java:595) at com.ricston.w3c.W3CDocumentXPathNodeEvaluatorTestCase.testW3CDocument(W3CDocumentXPathNodeEvaluatorTestCase.java:23) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at junit.framework.TestCase.runTest(TestCase.java:168) at junit.framework.TestCase.runBare(TestCase.java:134) at org.mule.tck.AbstractMuleTestCase.runBare(AbstractMuleTestCase.java:287) at junit.framework.TestResult$1.protect(TestResult.java:110) at junit.framework.TestResult.runProtected(TestResult.java:128) at junit.framework.TestResult.run(TestResult.java:113) at junit.framework.TestCase.run(TestCase.java:124) at org.mule.tck.AbstractMuleTestCase.run(AbstractMuleTestCase.java:266) at junit.framework.TestSuite.runTest(TestSuite.java:232) at junit.framework.TestSuite.run(TestSuite.java:227) at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:79) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecut... ********************************************************************************
• Similar Issues:

  None

When you use an xpath-node expression evaluator on an org.w3c.dom.Document, the evaluator will throw the following exception:

WRONG_DOCUMENT_ERR: A node is used in a different document than the one that created it. (org.w3c.dom.DOMException)
com.sun.org.apache.xerces.internal.dom.ParentNode:352

Fix is very easy, all we have to do is import the node to be copied in the new document in the class XPathNodeExpressionEvaluator.

As an explanation, you can look at the dom4j section of the extractResultFromNode() method. In the dom4j section, we get the result and detach it from the current document to create a new document. We must do the same when we have a w3c Document, however, instead of doing detach(), we should execute importNode().