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MQSeries.net Forum Index » WebSphere Message Broker (ACE) Support » Cast Exception when trying to convert BLOB into CHARACTER

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cong_ren
PostPosted: Wed Jan 25, 2012 3:07 pm    Post subject: Cast Exception when trying to convert BLOB into CHARACTER Reply with quote

Newbie

Joined: 25 Jan 2012
Posts: 2
Hi,

I am getting the following cast exception when trying to convert a BLOB into a CHARACTER. It is unable to convert some of the characters inside the BLOB to the CHARACTER type.

Here is the ESQL code snippet of the casting operation:
SET OutputRoot.JMSTransport.Transport_Folders.Header_Values.JMSCorrelationID = CAST(InputLocalEnvironment.Destination.SOAP.Reply.ReplyIdentifier AS CHARACTER CCSID InputRoot.Properties.CodedCharSetId);

Question:
1. Is there anything wrong with the casting statement above?
2. If so, any recommendations as to how can I resolve this issue?

The reason I am doing such casting is to propagate the SOAPReplyID from the request flow to the response flow using the JMSCorrelID as a delivery vehicle.

Request: SOAP -> JMS
Response: JMS -> SOAP


+===============
Details of the Exception
+===============

ExceptionList
RecoverableException
File:CHARACTER:F:\build\S700_P\src\DataFlowEngine\ImbDataFlowNode.c
pp
Line:INTEGER:1073
Function:CHARACTER:ImbDataFlowNode::createExceptionList
Type:CHARACTER:ComIbmComputeNode
Name:CHARACTER:OrderServices#FCMComposite_1_24
Label:CHARACTER:OrderServices.SetSOAPReplyIdToJMSCorrelId
Catalog:CHARACTER:BIPmsgs
Severity:INTEGER:3
Number:INTEGER:2230
Text:CHARACTER:Node throwing exception
RecoverableException
File:CHARACTER:F:\build\S700_P\src\DataFlowEngine\ImbRdl\ImbRdlSt
atementGroup.cpp
Line:INTEGER:641
Function:CHARACTER:SqlStatementGroup::execute
Type:CHARACTER:ComIbmComputeNode
Name:CHARACTER:OrderServices#FCMComposite_1_24
Label:CHARACTER:OrderServices.SetSOAPReplyIdToJMSCorrelId
Catalog:CHARACTER:BIPmsgs
Severity:INTEGER:3
Number:INTEGER:2488
Text:CHARACTER:Error detected, rethrowing
Insert
Type:INTEGER:5
Text:CHARACTER:.SSFSAPIsUtil_SetSOAPReplyIdToJMSCorrelId.Main
Insert
Type:INTEGER:5
Text:CHARACTER:4.3
Insert
Type:INTEGER:5
Text:CHARACTER:SET
OutputRoot.JMSTransport.Transport_Folders.Header_Values.JMSCorrelation
ID = CAST(InputLocalEnvironment.Destination.SOAP.Reply.ReplyIdentifier
AS CHARACTER CCSID InputRoot.Properties.CodedCharSetId);
RecoverableException
File:CHARACTER:F:\build\S700_P\src\DataFlowEngine\ImbRdl\ImbRdl
TypeCast.cpp
Line:INTEGER:260
Function:CHARACTER:SqlTypeCast::evaluate
Type:CHARACTER:
Name:CHARACTER:
Label:CHARACTER:
Catalog:CHARACTER:BIPmsgs
Severity:INTEGER:3
Number:INTEGER:2521
Text:CHARACTER:Error while casting
Insert
Type:INTEGER:5
Text:CHARACTER:.SSFSAPIsUtil_SetSOAPReplyIdToJMSCorrelId.Main
Insert
Type:INTEGER:5
Text:CHARACTER:4.82
Insert
Type:INTEGER:5
Text:CHARACTER:X'534f4150000000000c000000000000008c1600000000
0000'
Insert
Type:INTEGER:5
Text:CHARACTER:CHARACTER
RecoverableException
File:CHARACTER:F:\build\S700_P\src\CommonServices\ImbConverte
r.cpp
Line:INTEGER:504
Function:CHARACTER:ImbConverterCPP::internalToUnicode
Type:CHARACTER:
Name:CHARACTER:
Label:CHARACTER:
Catalog:CHARACTER:BIPmsgs
Severity:INTEGER:3
Number:INTEGER:2135
Text:CHARACTER:Unconvertable character
Insert
Type:INTEGER:5
Text:CHARACTER:8c
Insert
Type:INTEGER:5
Text:CHARACTER:534f4150000000000c000000000000008c1600000000
0000
Insert
Type:INTEGER:2
Text:CHARACTER:1208


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rekarm01
PostPosted: Wed Jan 25, 2012 5:03 pm    Post subject: Re: Cast Exception when trying to convert BLOB into CHARACTE Reply with quote

Grand Master

Joined: 25 Jun 2008
Posts: 1415
This BLOB is not a valid UTF-8 byte sequence, because the byte X'8c' is not a valid UTF-8 start byte:
Quote:
X'53 4f 41 50 00 00 00 00 0c 00 00 00 00 00 00 00 8c 16 00 00 00 00 00 00'

Not every random byte sequence can represent a meaningful character string, (particularly those meant to represent correlation identifiers). Perhaps it's better to leave it in HEX when CASTing to CHARACTER, by removing the CCSID parameter:

Code:
SET OutputRoot.JMSTransport.Transport_Folders.Header_Values.JMSCorrelationID
    = CAST(InputLocalEnvironment.Destination.SOAP.Reply.ReplyIdentifier AS CHARACTER);
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fjb_saper
PostPosted: Wed Jan 25, 2012 9:06 pm    Post subject: Reply with quote

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20768
Location: LI,NY
Have you even verified if the byte sizes are compatible?

A BLOB cannot always be CASTed to a CHAR. How do you transform x'00000000' into a char, in any CCSID?

Think it over again. The design may not fit.
Have fun
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kimbert
PostPosted: Thu Jan 26, 2012 4:54 am    Post subject: Reply with quote

Jedi Council

Joined: 29 Jul 2003
Posts: 5543
Location: Southampton
Quote:
This BLOB is not a valid UTF-8 byte sequence, because the byte X'8c' is not a valid UTF-8 start byte:
rekarm01 is correct. You should never have tried to cast the bytes of the MQMD header as characters. The MQMD contains a mixture of character and binary ( non-character ) data.
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lancelotlinc
PostPosted: Thu Jan 26, 2012 5:50 am    Post subject: Reply with quote

Jedi Knight

Joined: 22 Mar 2010
Posts: 4941
Location: Bloomington, IL USA
If your trying to print the MQMD.MsgId or MQMD.CorrelationId, here is some snazzy code to do the same from a JCN...

Code:
      for( int i = 0; i < 24; i++ ){
               
        String iHexStr = Integer.toHexString( Id[i] );
        if ( iHexStr.length()>2 ) iHexStr = iHexStr.substring( iHexStr.length()-2 );
        if ( iHexStr.length()<2 ) refId = refId + "0";
        refId = refId + iHexStr;     
               
      }


Good luck.
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cong_ren
PostPosted: Fri Jan 27, 2012 9:08 am    Post subject: Thanks for all your replies. But just wondering... Reply with quote

Newbie

Joined: 25 Jan 2012
Posts: 2
Thank you all who responded! Greatly appreciated.

I spent some of my time yesterday looking at the issue and tried 2 following attempts, both of which seems to resolve that casting issue:

1. Remove the CCSID parameter from the casting statement as recommended by rekarm01 and simply leave it as a HEX.

2. Changed the default windows codepage from 437 to 65001 and without changing the CCSID parameter.

I am still relatively new to MB and the code page. I sort of understand that BLOB is not a valid CHARACTER string and there can be sequences of strings within which cannot be converted to a CHARACTER (such as 'c8'). But I don't understand why what I did above seems to resolve the issue.

For #1, by removing the CCSID parameter, what does MB use instead for the casting? The default OS code page or the incoming message code page? Or neither?

For #2, it seems like MB takes the default OS code page into consideration. But how and when?
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kimbert
PostPosted: Fri Jan 27, 2012 9:21 am    Post subject: Reply with quote

Jedi Council

Joined: 29 Jul 2003
Posts: 5543
Location: Southampton
Quote:
For #1, by removing the CCSID parameter, what does MB use instead for the casting? The default OS code page or the incoming message code page? Or neither?
see http://publib.boulder.ibm.com/infocenter/wmbhelp/v7r0m0/topic/com.ibm.etools.mft.doc/ak05680_.htm
Specifically, the row which explains BLOB to CHARACTER casts. By removing the CCSID clause you revert to the behaviour in the first paragraph ( the BLOB is not interpreted as CHARACTER data, it gets converted to a hexBinary string ).
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