Spring: OXM error when unmarshalling XML string (castor)

java xml spring spring-integration oxm
Xorty picture Xorty · Jun 22, 2012 · Viewed 8.6k times · Source

I am doing Spring Integration project. I'd like to publish XML string to one channel and receive Java object in other channel, via unmarshalling transformer.

In my Spring config I am using these channels and beans:

<!-- channel to for publishing XML string -->
<int:publish-subscribe-channel id="channels.pubsub.inXml" />

<!-- channel for receiving transformed reply -->
<int:channel id="channels.fromXmlChannel">
    <int:queue capacity="10" />
</int:channel>

<!-- transformer unmarshalling XML to Java object -->
<int-xml:unmarshalling-transformer
    unmarshaller="marshaller"
    input-channel="channels.pubsub.inXml"
    output-channel="channels.fromXmlChannel" />

<!-- marshaller bean -->
<bean id="marshaller" class="org.springframework.oxm.castor.CastorMarshaller" />

I am trying this in unit test, so I have autowired channels to use:

@Autowired @Qualifier("channels.pubsub.inXml")
MessageChannel inXmlChannel;

@Autowired @Qualifier("channels.fromXmlChannel")
MessageChannel fromXmlChannel;

Trade class, which I want to have unmarshalled is very trivial POJO:

class Trade {
    String id;
    String direction;
    // getters, setters, constructors
}

Here's my JUnit test method, but I get exception on 3rd line:

    @Test
public void testUnmarshallingTransformer() {
    String xml = "<trade id='ID-01' direction='DIR-PRG' />";

    Message<String> message = MessageBuilder.withPayload(xml).build();
    inXmlChannel.send(message, TIMEOUT);
    Message<?> received = ((PollableChannel) fromXmlChannel).receive(TIMEOUT);

    System.out.println("\n\n" + received.getPayload());
}

And finally here's stacktrace:

org.springframework.integration.transformer.MessageTransformationException: failed to transform message
    at org.springframework.integration.transformer.AbstractTransformer.transform(AbstractTransformer.java:44)
    at org.springframework.integration.transformer.MessageTransformingHandler.handleRequestMessage(MessageTransformingHandler.java:67)
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:97)
    at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:73)
    at org.springframework.integration.dispatcher.BroadcastingDispatcher.invokeHandler(BroadcastingDispatcher.java:105)
    at org.springframework.integration.dispatcher.BroadcastingDispatcher.dispatch(BroadcastingDispatcher.java:96)
    at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:61)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:157)
    at sk.xorty.transformers.BuiltinTransformersTest.testUnmarshallingTransformer(BuiltinTransformersTest.java:190)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:76)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:195)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:63)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: org.springframework.oxm.UnmarshallingFailureException: Castor unmarshalling exception; nested exception is org.exolab.castor.xml.MarshalException: The class for the root element 'trade' could not be found.{File: [not available]; line: 1; column: 41}
    at org.springframework.oxm.castor.CastorMarshaller.convertCastorException(CastorMarshaller.java:487)
    at org.springframework.oxm.castor.CastorMarshaller.unmarshalReader(CastorMarshaller.java:399)
    at org.springframework.oxm.support.AbstractMarshaller.unmarshalStreamSource(AbstractMarshaller.java:371)
    at org.springframework.oxm.support.AbstractMarshaller.unmarshal(AbstractMarshaller.java:134)
    at org.springframework.integration.xml.transformer.UnmarshallingTransformer.transformPayload(UnmarshallingTransformer.java:107)
    at org.springframework.integration.transformer.AbstractPayloadTransformer.doTransform(AbstractPayloadTransformer.java:33)
    at org.springframework.integration.transformer.AbstractTransformer.transform(AbstractTransformer.java:33)
    ... 39 more
Caused by: org.exolab.castor.xml.MarshalException: The class for the root element 'trade' could not be found.{File: [not available]; line: 1; column: 41}
    at org.exolab.castor.xml.Unmarshaller.convertSAXExceptionToMarshalException(Unmarshaller.java:866)
    at org.exolab.castor.xml.Unmarshaller.unmarshal(Unmarshaller.java:763)
    at org.springframework.oxm.castor.CastorMarshaller.unmarshalReader(CastorMarshaller.java:396)
    ... 44 more
Caused by: org.xml.sax.SAXException: The class for the root element 'trade' could not be found.
    at org.exolab.castor.xml.UnmarshalHandler.processFirstElement(UnmarshalHandler.java:890)
    at org.exolab.castor.xml.StartElementProcessor.compute(StartElementProcessor.java:103)
    at org.exolab.castor.xml.UnmarshalHandler.startElementProcessing(UnmarshalHandler.java:811)
    at org.exolab.castor.xml.UnmarshalHandler.startElement(UnmarshalHandler.java:733)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:506)
    at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:182)
    at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.emptyElement(XMLDTDValidator.java:766)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1302)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$ContentDriver.scanRootElementHook(XMLDocumentScannerImpl.java:1275)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3063)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:881)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:607)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:488)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:835)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1210)
    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:568)
    at org.exolab.castor.xml.Unmarshaller.unmarshal(Unmarshaller.java:751)
    ... 45 more

Answer

aymen hadhraoui picture aymen hadhraoui · Mar 3, 2015

To resolve this issue you need to specify your class that you want to parse. CastorMarshaller has two attribute targetClasses wich is an array of Objects and targetPackages wich is an array of Strings you can verify the source of this class.

The code below will resolve your problem without a mapping file.

<bean id="marshaller" class="org.springframework.oxm.castor.CastorMarshaller">
  <property name="targetClasses">
    <array>
      <value>Your class location (ex : com.domain.YourClass)</value>
    </array>
  </property>
</bean>

If the class to parse still unknown, you have to verify your xml file format.

Example :

Java class 

public class MyUser {
  // class attributs

  private String firstNameField;
  private String lastNameField;

  // class methods
  //...... 
}

xml file 

<?xml version="1.0" encoding="UTF-8"?>
<my-user>
  <first-name-field>firstName</first-name-field>
  <last-name-field>lastName</last-name-field>
</my-user>

Related questions

Spring schemaLocation fails when there is no internet connection

I am using Spring and in application-context.xml I have the following definitions: <?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:util="http://www.springframework.…

Read More
no suitable HttpMessageConverter found for response type

Using spring, with this code : List<HttpMessageConverter<?>> messageConverters = restTemplate.getMessageConverters(); for(HttpMessageConverter httpMessageConverter : messageConverters){ System.out.println(httpMessageConverter); } ResponseEntity<ProductList> productList = restTemplate.getForEntity(productDataUrl,ProductList.class); I get org.springframework.http.converter.ByteArrayHttpMessageConverter@34649ee4 …

Read More
Is there a way to specify a default property value in Spring XML?

We are using a PropertyPlaceholderConfigurer to use java properties in our Spring configuration (details here) eg: <foo name="port"> <value>${my.server.port}</value> </foo> We would like to add an additional …

Read More