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| Getting error while reading message with MQMD Format blank |
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| tapak |
 Posted: Fri Aug 24, 2007 7:05 am Post subject: Getting error while reading message with MQMD Format blank |
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Centurion
Joined: 26 Oct 2005
Posts: 149
Location: Hartford,CT
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Whenever we try to read a native MQ message with MessageFormat field in MQMD Header is blank , IBM JMS API returns the object as Bytemessage even if the data in the message is string .
When we try to get the data from the Bytemessage object ,we are getting the following exception . Is there a reason this condition is not handled by MQ JMS to get valid data.? Or Is there any method I can use to get the data without throwing an exception.
As a work around ,we are catching the exception , java.io.StreamCorruptedException and converting the bytes to string.
1.
| Code: |
if (JMSMsg instanceof BytesMessage) {
BytesMessage bJMSMsg = (BytesMessage) JMSMsg;
String str = bJMSMsg.readUTF();
Code above throws following exception.
javax.jms.MessageEOFException: MQJMS0005: Unexpected end of stream has been reached when a StreamMessage or BytesMessage is being read
at com.ibm.jms.JMSMessage.newMessageEOFException(JMSMessage.java:4629)
at com.ibm.jms.JMSBytesMessage.readUnsignedShort(JMSBytesMessage.java:1033)
at com.ibm.jms.JMSBytesMessage.readUTF(JMSBytesMessage.java:1097)
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2.
| Code: |
if (JMSMsg instanceof BytesMessage) {
BytesMessage bJMSMsg = (BytesMessage) JMSMsg;
byte[] array = new byte[(int) bJMSMsg.getBodyLength()];
bJMSMsg.readBytes(array);
if (array == null)
return null;
ByteArrayInputStream inBytes = new ByteArrayInputStream(array);
ObjectInputStream inStream = new ObjectInputStream(inBytes);
oMsg = inStream.readObject();
java.io.StreamCorruptedException: invalid stream header
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:737)
at java.io.ObjectInputStream.<init>(ObjectInputStream.java:253)
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[/code]
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| jefflowrey |
| Posted: Fri Aug 24, 2007 7:18 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Don't use readUTF() unless you know that the sender of the message had used writeUTF().
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I am *not* the model of the modern major general. |
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| fjb_saper |
| Posted: Fri Aug 24, 2007 8:22 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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Don't assume that because you have a BytesMessage that you have a serialized java object... That should be an ObjectMessage....
So no you cannot deserialize a java object from a BytesMessage.
If you know however that the content is text, you can use the String constructor/method accepting a byte array...
Enjoy 
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| tapak |
| Posted: Fri Aug 24, 2007 9:39 am Post subject: |
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Centurion
Joined: 26 Oct 2005
Posts: 149
Location: Hartford,CT
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| Thanks very much for your inputs . Yes. write now I am trying to convert it to String using the String constructor. I am not sure if it is always a string . So basically I catch the exception and try to convert it to string. |
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