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| MQMessage.writeInt and readInt strange behavor |
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| Author |
Message
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| HenriqueS |
 Posted: Mon Sep 25, 2006 10:22 am Post subject: MQMessage.writeInt and readInt strange behavor |
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Master
Joined: 22 Sep 2006
Posts: 235
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Folks, the code below writes some ints to the queue, and when pops up the same message back, the java variables that are fed with readInt are holding bizarre values, making the JVM into crashing because one of the read variables are used to allocate memory (and the value returned is so big the JVM cannot handle it). Anyway, the read value from readInt() is totally different from what was written in the message. I tried to force the machine endianess but it did not help.
Any idea?
*code comments are in portuguese, but it´s a simple program...
Websphere MQ 6.0 running under Intel 32 Platform win WinXP.
| Code: |
public HandlingMessagesSample1(){
try{
MQQueueManager queueManager = new MQQueueManager("javaexamples");
MQQueue queue = queueManager.accessQueue("testqueue", MQC.MQOO_OUTPUT | MQC.MQOO_INPUT_AS_Q_DEF, "javaexamples", "dynamicQName", "altUserId");
//Construindo uma mensagem contendo containing a minha idade seguida pelo nome
MQMessage myMessage = new MQMessage();
myMessage.encoding = MQC.MQENC_INTEGER_REVERSED | MQC.MQENC_DECIMAL_REVERSED | MQC.MQENC_FLOAT_IEEE_REVERSED;
myMessage.writeInt(25);
String name = "Charlie Jordan";
myMessage.writeInt(name.length());
myMessage.writeBytes(name);
//Usando as opções default para colocar a mensagem...
MQPutMessageOptions pmo = new MQPutMessageOptions();
//colocando a mensagem no queue
queue.put(myMessage,pmo);
//Tirando a mensagem do queue
MQMessage theMessage = new MQMessage();
MQGetMessageOptions gmo = new MQGetMessageOptions();
queue.get(theMessage, gmo);
//Extraindo os dados da mensagem
int age = theMessage.readInt();
int strLen = theMessage.readInt();
byte[] strData = new byte[strLen];
theMessage.readFully(strData, 0, strLen);
name = new String(strData, 0);
System.out.println(name);
}catch(Exception ex){
ex.printStackTrace();
}
} |
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| vennela |
| Posted: Mon Sep 25, 2006 10:32 am Post subject: |
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Jedi Knight
Joined: 11 Aug 2002
Posts: 4055
Location: Hyderabad, India
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| Code: |
myMessage.writeInt(25);
String name = "Charlie Jordan";
myMessage.writeInt(name.length());
myMessage.writeBytes(name); |
What happens if you do just
| Code: |
| myMessage.writeInt(25); |
and comment the rest of the lines? |
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| HenriqueS |
| Posted: Mon Sep 25, 2006 11:36 am Post subject: |
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Master
Joined: 22 Sep 2006
Posts: 235
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writeInt(25)
readInt(var)
System.println.out gives 1633771873 !!!
That´s what I get also during debug... |
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| jefflowrey |
| Posted: Mon Sep 25, 2006 11:42 am Post subject: Re: MQMessage.writeInt and readInt strange behavor |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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You do this:
| HenriqueS wrote: |
| myMessage.encoding = MQC.MQENC_INTEGER_REVERSED | MQC.MQENC_DECIMAL_REVERSED | MQC.MQENC_FLOAT_IEEE_REVERSED; |
Once.
You need to do it twice.
_________________
I am *not* the model of the modern major general. |
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| HenriqueS |
| Posted: Mon Sep 25, 2006 1:03 pm Post subject: Re: MQMessage.writeInt and readInt strange behavor |
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Master
Joined: 22 Sep 2006
Posts: 235
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Thnaks a lot, it worked!
| jefflowrey wrote: |
You do this:
| HenriqueS wrote: |
| myMessage.encoding = MQC.MQENC_INTEGER_REVERSED | MQC.MQENC_DECIMAL_REVERSED | MQC.MQENC_FLOAT_IEEE_REVERSED; |
Once.
You need to do it twice. |
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| jefflowrey |
| Posted: Mon Sep 25, 2006 1:19 pm Post subject: Re: MQMessage.writeInt and readInt strange behavor |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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| jefflowrey wrote: |
| You need to do it twice. |
The reason, of course, is because you do
| Code: |
//Tirando a mensagem do queue
MQMessage theMessage = new MQMessage(); |
New message = default Encoding = not what you wrote with.
_________________
I am *not* the model of the modern major general. |
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