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| Message Id getting overwritten in MQJMS binding |
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| mdshah7 |
 Posted: Tue Sep 25, 2012 2:21 am Post subject: Message Id getting overwritten in MQJMS binding |
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Newbie
Joined: 06 Sep 2011
Posts: 5
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Hello,
I have an mdb deployed in weblogic that receives messages from MQ, reads the properties like MessageID,PutapplnName, etc from the messages through MQJMS binding and prints it. While printing the message id, it is replacing the alphabet characters with their lower case,
eg : When I put the message in the Q where the MDB is listening, the message id is 414D51204C55504C5558514D475220205012254C20142602, but once it is comsumed by the mdb and then I print it , it is getting changed to 414d51204c55504c5558514d475220205012254c20142602.. All the alphabets are getting replaced with lower case letters.
Is it an expected behaviour ? Is there anyway through which I can instruct weblogic not to overwrite this message id ?
Thanks for ur help.
Shah Alam |
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| mqsiuser |
| Posted: Tue Sep 25, 2012 3:07 am Post subject: Re: Message Id getting overwritten in MQJMS binding |
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Yatiri
Joined: 15 Apr 2008
Posts: 637
Location: Germany
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| mdshah7 wrote: |
414D51204C55504C5558514D475220205012254C20142602
414d51204c55504c5558514d475220205012254c20142602 |
That looks like HEX.... that is it goes from zero (0) to fifteen (15): 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F
Probably it is just displaying differently ?! So ... it is the same byte-wise: 0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f
0000, 0001, 0010, ...
Others may have better ideas  |
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| mdshah7 |
| Posted: Tue Sep 25, 2012 3:34 am Post subject: |
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Newbie
Joined: 06 Sep 2011
Posts: 5
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Thanks for replying..
That may be true. But is there anyway through which I can instrcut weblogic not to overwrite this message id?
Thanks again in advance..
Shah Alam |
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| mqsiuser |
| Posted: Tue Sep 25, 2012 4:09 am Post subject: |
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Yatiri
Joined: 15 Apr 2008
Posts: 637
Location: Germany
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| mdshah7 wrote: |
| But is there anyway through which I can instrcut weblogic not to overwrite this message id? |
If the message ID is HEX then WebLogic does not overwrite the value, since...
| wikipedia wrote: |
| In mathematics and computer science, hexadecimal (also base 16, or hex) is a positional numeral system with a radix, or base, of 16. It uses sixteen distinct symbols, most often the symbols 0–9 to represent values zero to nine, and A, B, C, D, E, F (or alternatively a–f) to represent values ten to fifteen. |
The place/tool/interface where you look just displays (the exactly same bits) but in lower-case (a b c d e f).
Thought probably you still come into conversion problems... you think you do ? |
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| mdshah7 |
| Posted: Tue Sep 25, 2012 4:23 am Post subject: |
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Newbie
Joined: 06 Sep 2011
Posts: 5
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Thanks for ur reply,
To check this, I wrote a small standalone program to print the messageid. This program would use the normal MQ API to get a message and print it's corresponding Msgid. It was getting printed as CAPS..
Only when the MQJMS concept comes into picture, then the message id is getting disturbed.
BTW is there some setting in weblogic to tell it that it should not touch the MQ properties and keep it as it is ?
Thanks,
Shah Alam |
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| Vitor |
| Posted: Tue Sep 25, 2012 4:45 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| mdshah7 wrote: |
| Only when the MQJMS concept comes into picture, then the message id is getting disturbed. |
AFAIK it's part of the JMS standard that message id is set so no, you're pretty much done.
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| mqjeff |
| Posted: Tue Sep 25, 2012 1:28 pm Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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You need to think very carefully for a moment.
We've told you repeatedly several times that there is no meaningful difference between the value with lower case abcdef and with uppercase ABCDEF.
It does not in any way alter the value of the id at all to represent it using either set of letters or a mix of both.
If you somehow feel that you absolutely MUST have this in an UPPER case, then you can simply alter all of your print statements that output this value to use the bog standard java coding to UPPERCASE the text you give it before you print it.
Secondly, as you've just been mentioned, there's a specific aspect of the JMS messaging standard that means that all JMS implementations must do certain things when they send messages - which prevents all MQ JMS applications from being able to specify the MQMD.MessageID.
So you need to keep that fact in mind when designing MQ solutions that talk to JMS applications. |
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| mqsiuser |
| Posted: Tue Sep 25, 2012 8:05 pm Post subject: |
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Yatiri
Joined: 15 Apr 2008
Posts: 637
Location: Germany
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Dear OP,
it is really important for you to understand that on HEX someone just needed to count from zero (0) to fifteen (15). And that he or she decided for the alphabet to represent ten (10) and eleven an up to fifteen. But he or she left it open whether to use capital letters or small ones.
I do not doubt that this can/might/may also lead to problems somehow/someday/somewhere. E.g. all of a sudden the 0...F (or 0...f) are stored with an ASCII-256 or base64... boom: a is not A, b is not B.
As mqjeff suggests you may e.g. use the uppercase-function then.
Make sure you understand what happens (on bits (0 and 1) level) and that you are aware of the codepage/charset (currently applied to these bits), encoding (big or little endian) or if other means of bits-representation (e.g. HEX, BLOB, base64) are currently chosen/applied and potentially conversions between those (and where they happen). |
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| mdshah7 |
| Posted: Tue Sep 25, 2012 11:30 pm Post subject: |
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Newbie
Joined: 06 Sep 2011
Posts: 5
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| ok guys ! Many thanks for your help.. |
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