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| Copy MQMD.MsgId to MQMD.CorrelId Java Compute Node Issue |
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Message
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| satya2481 |
 Posted: Thu Dec 16, 2010 2:51 am Post subject: Copy MQMD.MsgId to MQMD.CorrelId Java Compute Node Issue |
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Disciple
Joined: 26 Apr 2007
Posts: 170
Location: Bengaluru
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Hi All,
I am using WMB V6.1 Toolkit and Runtime components.
I am facing an issue with copying MQMD.MsgId to element to MQMD.CorrelId in JCN node. My requirement is as below.
Flow 1
1. Get the message from the Queue, read as BLOB message
2. Convert the message from BLOB domain to XMLNS domain
3. Copy MQMD.MsgId and store it in the newly constructed XMLNS Message, create an element called "MessageId" and store some where in the message (Please note that not in any header)
4. Put the message to output queue
Flow 2
1. Get the message from the Queue sent from Flow 1
2. Get the "<MessageId>" field value from the message
3. Copy the MessageId to MQMD.CorrelId
4. Put the message to output queue
My code looks like below...
Flow1. Step 3
| Code: |
MbElement inMsgId = inRoot.getFirstElementByPath("/MQMD/MsgId");
byte[] mByte = (byte[]) (inMsgId.getValue()) ;
MbElement outMessageId = inParsedMessage.getFirstChild().getFirstChild().getFirstChild().createElementAsFirstChild(MbXMLNS.ELEMENT, "MessageId", mByte ); |
Flow2 Step 3.
| Code: |
MbElement messageId = outRoot.getFirstElementByPath("/XMLNS/MsgRoot/Name/FName/MessageId");
MbElement outCorrelId = outRoot.getFirstElementByPath("/MQMD/CorrelId");
outCorrelId.setValue((byte[])(messageId.getValue())); |
I am getting "ClassCastException" in the Flow2.
Please let me know how to resolve this issue...
Please note that I have to pass the MsgId as part of the message and not as part of the MQMD or MQRFH2 header.
Regards
Satya |
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| mqjeff |
| Posted: Thu Dec 16, 2010 4:01 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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Well, it's not going to work to store a message ID as a plain value into a string value in an XML document, as the message ID will very easily contain non-printable and illegal XML characters, and may in fact include lovely things like >, <, or /.
Secondly, you should be using XMLNSC, not XMLNS.
Thirdly, if you do a cast of the value as you did, you will likely end up with a significantly longer field than 24 bytes, because the original 24 bytes you put in have now been treated as unicode characters.
You need to do something to ensure that you can preserve actual byte values across this transformation, which you have not done as yet. Some options include turning the bytes into two character hex representations, or using a base64 encoding. |
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| satya2481 |
| Posted: Thu Dec 16, 2010 11:30 pm Post subject: |
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Disciple
Joined: 26 Apr 2007
Posts: 170
Location: Bengaluru
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Hi,
I have used java "Stack" to Push and Pop Message ID. Problem is resolved. However I need to tune my code 
Regards
Satya |
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