Mule XML Streaming - (Mule xmltoxmltransformation) - mule

Question

Trying to use the Mule XML streaming feature as have to process very large xml files. Followed the documentation, the document does not have concrete examples.
When I inspected the payload I get the XMLUtils class and not the XMLStreamReader class as stated in the documentation.
The flow is as follows have a file connector which passes payload to a custom transformer, the transformer passes the data to a spring bean which is going to have event based processing.
In the spring bean. At run time the spring bean gets the XMLUtils class and not the XMLStreamReader class.
Mule - Config:
<spring:beans>
<spring:bean id="OracleCDMMapper" class="oraclecdmstream.OracleCDMMapper">
</spring:bean>
<spring:bean id = "OraclePaySlip" class="com.nect.transform.OracleCDMPaySlip" ></spring:bean>
</spring:beans>
<flow name="mulefileconnectorexampleFlow1" >
<file:inbound-endpoint path="C:/c-OracleCloud/src/main/resources" pollingFrequency="600000" moveToDirectory="C:/c-OracleCloud/src/main/resources/back" doc:name="File Input" >
<!-- <file:filename-regex-filter pattern="(^*.xml$)" caseSensitive="false"/>
--> <file:filename-wildcard-filter pattern="*.xml"></file:filename-wildcard-filter>
</file:inbound-endpoint>
<logger message="Transferring file : #[message.inboundProperties['originalFilename']]" level="INFO" doc:name="Logger"/>
<logger message ="Logger 1 " level="INFO" doc:name ="Logger1" />
<!-- Call the XMLSTREAMER -->
**<custom-transformer name="XmlToXSR" class="org.mule.module.xml.transformer.XmlToXMLStreamReader" doc:name="XMLTOORACLE">**
</custom-transformer>
<component doc:name="Java">
<spring-object bean="OracleCDMMapper"/>
</component>
-->
<logger message ="I am Complete " level="INFO" doc:name ="LoggerMurali" />
</flow>
</mule>
Here is the Javacode:
Spring Bean
public class OracleCDMMapper implements Callable {
private final Logger logger = LoggerFactory.getLogger(OracleCDMMapper.class);
#Override
public Object onCall(MuleEventContext eventContext) throws Exception {
// TODO Auto-generated method stub
MuleMessage muleMessage = eventContext.getMessage();
logger.info("In the Spring Component");
logger.info(muleMessage.getPayload().getClass().toString());
**javax.xml.stream.XMLStreamReader xsr = (XMLStreamReader) muleMessage.getPayload(javax.xml.stream.XMLStreamReader.class);**
Any help will be much appreciated

Answer 1

I've verified and you are right, in the code the supposed returning class should be a DelegateXMLStreamReader class that implements XMLStreamReader, but the returned class is an anonymous inner class of XMLUtils that at runtime cannot be casted to any Stream like class. It seems to be a defect.
If you really need the control of the xml stream, you could use a custom java component:
<component class="com.foo.CustomJavaComponent" doc:name="Java"/>
.
public class CustomJavaComponent implements Callable{
#Override
public Object onCall(MuleEventContext eventContext) throws Exception {
MuleMessage muleMessage = eventContext.getMessage();
FileInputStream fis = (FileInputStream)muleMessage.getPayload();
//Do something with this stream
return "Hello world";
}
}
And get the input stream to do whatever you want.