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| Schema Validation after XML Tranformation node |
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| Author |
Message
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| asalema |
 Posted: Mon Oct 02, 2006 10:28 am Post subject: Schema Validation after XML Tranformation node |
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Apprentice
Joined: 05 May 2003
Posts: 35
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Hi All,
I have a flow as follows:
HTTPInput->XMLTransformation node->Javacompute(Schema Validation using Xerces)->HTTPReply
The javacompute node simply validates the incoming message against a schema file on the file system using a static function
Here is the code for the javacompute
| Code: |
public void evaluate(MbMessageAssembly contact admin) throws MbException {
MbOutputTerminal out = getOutputTerminal("out");
MbOutputTerminal alt = getOutputTerminal("alternate");
.....................................
//Obtain the bitstream of the message body, i.e. the last element of the message
byte[] bitstream = contact admin.getMessage().getRootElement().getLastChild().toBitstream(null,null,null,0,0,0);
//Convert the byte array into a string.
String bitstreamText = new String(bitstream, "UTF-8");
schemaLocation = "http://ephsprj.org/GetPersonDemographicsBO /ephs/schemas/EPHS_GetPersonDemographics_WSBO.xsd";
problem====> ParserUtil.parseString( bitstreamText, true, schemaLocation );
............................................
}
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ParserUtil.parseString is a static function with the following code
| Code: |
static private DOMParser EPHSParser = new DOMParser();
public static Document parseString( String xmlString, boolean validation, String schemaLocation ) throws Exception {
return parse( new InputSource( new StringReader( xmlString ) ), validation, schemaLocation );
}
public static Document parse ( InputSource inputSource, boolean validation,
String schemaLocation ) throws Exception {
//DOMParser parser = new DOMParser();
EPHSParser.setFeature("http://xml.org/sax/features/validation", validation );
if (schemaLocation != null)
{
EPHSParser.setFeature("http://apache.org/xml/features/validation/schema",true);
EPHSParser.setProperty("http://apache.org/xml/properties/schema/external-schemaLocation",
schemaLocation);
}
ErrorHolder errHolder = new ErrorHolder();
EPHSParser.setErrorHandler( new ParserErrorHandler(errHolder) );
EPHSParser.parse( inputSource );
Document doc = EPHSParser.getDocument();
if ( errHolder.isError() ) {// add exception with the source of the XML file
throw new ErrorHolderException( errHolder );
}
return doc;
}
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The transformation part is straightforward copy of the message plus some business validation for some elements and it always works fine.
Now, if I call the validation after the transformation, I always get this exception the first time I deploy the message flow
| Code: |
java.lang.ExceptionInInitializerError
at com.ibm.ephsesb.mb.java.validation.EPHS_validateMsg_JavaCompute.validate(EPHS_validateMsg_JavaCompute.java:34)
at com.ibm.ephsesb.mb.java.validation.EPHS_validateMsg_JavaCompute.evaluate(EPHS_validateMsg_JavaCompute.java:133)
at com.ibm.broker.javacompute.MbRuntimeJavaComputeNode.evaluate(MbRuntimeJavaComputeNode.java:105)
at com.ibm.broker.plugin.MbNode.evaluate(MbNode.java:1222)
at com.ibm.broker.plugin.MbOutputTerminal._propagate(Native Method)
at com.ibm.broker.plugin.MbOutputTerminal.propagate(MbOutputTerminal.java:140)
at com.ibm.xsl.mqsi.XMLTransformNode.evaluate(XMLTransformNode.java:1017)
at com.ibm.broker.plugin.MbNode.evaluate(MbNode.java:1222)
Caused by: java.lang.ClassCastException: org.apache.xerces.parsers.XML11Configuration
at org.apache.xerces.parsers.DOMParser.<init>(Unknown Source)
at org.apache.xerces.parsers.DOMParser.<init>(Unknown Source)
at com.ibm.ephsesb.mb.java.xmlvalidation.ParserUtil.<clinit>(ParserUtil.java:72)
... 8 more
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then I get "EPHS_validateMsg_JavaCompute NoClassDefFoundError" if I try the same message again, cause the class did not initialize correctly
Strangely enough, if the transformation fails for some reason, the validation works fine
Yet more strangely, if I move the JavaCompute node "before" the XMLtransformation, the validation always works fine. Same thing, if I put validation before and after transformation. So, once transformation happens correctly, I cannot validate any more.
This indicates, that apparantly the DOMParser used by the ParserUtil class, some how, conflicts with the similar class used by the XMLTranformation node. Although, they both should be using the same Xerces library which is part of the MessageBroker.
I would highly appreciate any guidance as I have been working on this problem for more than 3 days now.
Best Regards, |
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| XZ |
| Posted: Tue Oct 03, 2006 2:49 am Post subject: |
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Apprentice
Joined: 22 May 2006
Posts: 45
Location: IBM Hursley
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This appears to be a bug. Could you please raise a PMR?
_________________
Regards,
-XZ
WMQI Development |
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| wischlei |
| Posted: Fri Aug 10, 2007 4:16 am Post subject: Problem resolved |
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Novice
Joined: 11 Feb 2004
Posts: 21
Location: Germany
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Hi there,
I seem to have the same problem (XML Transformation -> XML Validation Node -> Exception) with a 6.0.0.2/6.0.0.3 broker on AIX and Windows. Has it been resolved?
Regards
Winfried Schleipen
_________________
Winfried Schleipen |
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