| Author |
Message
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| emiddleware |
 Posted: Thu Dec 04, 2014 11:30 pm Post subject: Null value while accessing input message tree in Javacompute |
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Centurion
Joined: 03 Apr 2006
Posts: 120
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Hi,
I am using MQ v7.1 , WMB v8.0.0.0.0 on Windows Ultimate environment.
My xml structure data is
| Code: |
<Participant>
<External_Id>
P000064
</External_Id>
</Participant> |
I chose , XMLNSC as Input message parsing , and Parsing Timing as "Immediate " , in the input node properties.
I want to access the value of "External_Id" element.
I use the code in JCN as
| Code: |
String strEx = "";
strEx = inMessage.getRootElement().getFirstElementByPath("/Participant/External_Id").getValueAsString();
System.out.println("Value of External_Id == >" +strEx); |
But I get Null pointer exception ..
I even tried this statement :
| Code: |
MbElement root = contact admin.getMessage().getRootElement();
MbElement externalid = root.getLastChild().getFirstChild().getFirstChild();
String strex = "";
strex = externalid.getValueAsString();
System.out.println("print the value of external id (Assembly) === >>"+strex);
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I am still getting null value ...
I refered the following links :
http://www-01.ibm.com/support/knowledgecenter/SSKM8N_8.0.0/com.ibm.etools.mft.doc/ac30330_.htm%23ac30330_
http://mqseries.net/phpBB/viewtopic.php?t=55253&sid=daca975983d2a094dd4d1ca4ef498a7a
Please let me know where I am missing . Your inputs will help me. Thanks.
_________________
Best Regards,
E-MiddleWare |
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| emiddleware |
| Posted: Fri Dec 05, 2014 12:16 am Post subject: Null value while accessing input message tree in Javacomput |
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Centurion
Joined: 03 Apr 2006
Posts: 120
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I tried
| Code: |
MbElement root = contact admin.getMessage().getRootElement();
MbElement externalid = root.getLastChild().getFirstChild().getFirstChild();
String strex = "";
strex = externalid.getValueAsString();
System.out.println("print the value of external id (Assembly) === >>"+strex);
MbElement externalid1 = inRoot.getLastChild().getFirstChild().getFirstChild();
String strex1 = "";
strex1 = externalid1.getValueAsString();
System.out.println("print the value of external id (Message) === >>"+strex1); |
Still I am getting null value
_________________
Best Regards,
E-MiddleWare |
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| emiddleware |
| Posted: Fri Dec 05, 2014 12:20 am Post subject: Null value while accessing input message tree in Javacomput |
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Centurion
Joined: 03 Apr 2006
Posts: 120
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Please ignore above message .
I tried the below code
| Code: |
MbMessage inMessage = contact admin.getMessage();
MbMessage outMessage = new MbMessage(inMessage);
MbElement inRoot = inMessage.getRootElement().getLastChild();
MbElement root = contact admin.getMessage().getRootElement();
MbElement externalid = root.getLastChild().getFirstChild().getFirstChild();
String strex = "";
strex = externalid.getValueAsString();
System.out.println("print the value of external id (Assembly) === >>"+strex);
MbElement externalid1 = inRoot.getLastChild().getFirstChild().getFirstChild();
String strex1 = "";
strex1 = externalid1.getValueAsString();
System.out.println("print the value of external id (Message) === >>"+strex1); |
_________________
Best Regards,
E-MiddleWare |
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| mqjeff |
| Posted: Fri Dec 05, 2014 5:50 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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You can use usertrace to see how the java code executes.
Your last set of code assumes that the field you want is specifically in the position in the tree you're accessing, rather than finding it by name which the first set of code did.
You should be able to use the getFirstElementByPath just fine, as long as you make sure you know where you're starting from and what the path has to look like from that point.
A trace node output of the tree should help you resolve path issues. |
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| emiddleware |
| Posted: Sun Dec 07, 2014 11:22 pm Post subject: Null value while accessing input message tree in Javacompute |
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Centurion
Joined: 03 Apr 2006
Posts: 120
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Hi All ,
I see a strange behavior here.
While accessing the tree elements, and then print the value by using the statement
| Code: |
| valueString = (String)valueElement.getValue(); , I was able to print the value and see the value in Broker console as Value of External_Id == >P000282. |
Strangely , When I again ran today, the same code, only different value, I get a null value exception....
In Event viewer, I always see error stuck at the statement
| Code: |
valueString = (String)valueElement.getValue(); or
valueString = valueElement.getValueAsString(); |
Mqjeff : I applied trace node.
| Code: |
In Trace - After MQInput node and before JCN
(0x01000000:Folder):XMLNSC = ( ['xmlnsc' : 0xa1401b0]
(0x01000000:Folder):Participant = (
(0x03000000:PCDataField):External_Id = 'P000064' (CHARACTER)
)
)
Out Trace - After JCN node , I see the values as
(0x01000000:Folder ):XMLNSC = ( ['xmlnsc' : 0xa123410]
(0x01000000:Folder):Participant = (
(0x03000000:PCDataField):External_Id = 'P000064' (CHARACTER)
)
)
(0x01000000:Folder ):XMLNSC = ( ['xmlnsc' : 0xa07e9a0]
(0x03000000:PCDataField):Business_Name = 'MicroAire' (CHARACTER)
)
(0x03000000:NameValue):Col1Value - Business_Name = 'MicroAire' (CHARACTER)
)
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My message flow is able to retrieve Business_Name from DB2 based on External_Id.
But I don't understand why the value is not printing in Broker console ???
The java runtime is jre7 in my local system.
java version "1.7.0_71"
Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
Java HotSpot(TM) Client VM (build 24.71-b01, mixed mode, sharing)
Kindly help me with your inputs . Your inputs can help me towards a right direction. Thanks.
_________________
Best Regards,
E-MiddleWare |
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| kimbert |
| Posted: Mon Dec 08, 2014 3:04 am Post subject: |
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Jedi Council
Joined: 29 Jul 2003
Posts: 5542
Location: Southampton
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A coupe of tips:
- when posting code or trace outputs in this forum, please use the [c ode] tags to make your posts readable.
- I never use System.out.println() statements to debug a message flow. You can set the Java debug port and then attach the Eclipse Java debugger to your message flow. See online for details.
_________________
Before you criticize someone, walk a mile in their shoes. That way you're a mile away, and you have their shoes too. |
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| emiddleware |
| Posted: Mon Dec 08, 2014 3:44 am Post subject: |
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Centurion
Joined: 03 Apr 2006
Posts: 120
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| kimbert wrote: |
A coupe of tips:
- when posting code or trace outputs in this forum, please use the [c ode] tags to make your posts readable.
- I never use System.out.println() statements to debug a message flow. You can set the Java debug port and then attach the Eclipse Java debugger to your message flow. See online for details. |
Thanks for your suggestions , Kimbert.
I did not get [c ode]. Could you elaborate ?
_________________
Best Regards,
E-MiddleWare |
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| kimbert |
| Posted: Mon Dec 08, 2014 5:04 am Post subject: |
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Jedi Council
Joined: 29 Jul 2003
Posts: 5542
Location: Southampton
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You can format your posts using the buttons that are located just above the edit window.
_________________
Before you criticize someone, walk a mile in their shoes. That way you're a mile away, and you have their shoes too. |
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