Issue sending java object and a file via StreamMessage

[sv_srinivaas]

Hi,

I'm using Hornetq 2.0.0 GA and Jboss AS 5.1.0 GA.

I have a requirement where I need to send a Java object and a pdf file both together as a single JMS message, I tried the large file example in distro and it worked fine for large files but I'm not sure how to send a java object along with that file.

I've attached the sample code that

                                   1. Sends a message to requestQ (with a file and an object as byte[]) ,

                                   2. Listener onMessage reads the message and extract the file/ object contents from the message.

The issue is that when I send either the file or the object in the message then the listener is able to extract the contents whereas if I send both the object and the file together then I get an "Invalid conversion" error in detachObject method while extracting the object contents.

Is it possible to send the java object as well as a large file (as stream)  in the same message? Pls help!!

Thanks

Srinivaas

[clebert.suconic]

You should probably use the ZIP API and send both the object and the PDF in a single file.

Or you could send two messages.

You can't have two bodies on a message.

[clebert.suconic]

If you use message group, you're sure both messages will arrive at the same consumer (case you use two messages)

[sv_srinivaas]

Clebert, Thanks a lot for your quick response. I tried the zip file approach and it worked fine but we do see some performance issues with large files.

Tried the second approach by grouping messages where I'm sending the file (StreamMessage) as the first mesage and then the java object (ObjectMessage) as the second message both having the same group id. I'm using MDB (poolsize 5) as the consumer but the messages are NOT read sequentially because I see the overlapping print statements from mdb in console.

Also I'd like to know when the messages are grouped, is the order of messages guaranteed? because in my case I want the file to be read always before the object is read. Tried setting the message priorities but still I could not see that happening.

[ataylor]

If 2 messages have the same group id then they will be consumed by the same consumer gauranteeing the order, are you saying this is not the case?

if so could you provide a standalone test case to demonstrate the issue.

[sv_srinivaas]

Andy, yes everything works now, it was a typo, I had used JMSXGROUPID instead of JMSXGroupID. Thanks a lot!

[clebert.suconic]

Did you look at the support for large messages?

Depending on the size of your messages.. maybe that would fit well for you... especially the large messaging streaming.

Look at the large message chapter.. it has some cool information.

[sv_srinivaas]

Clebert, thanks for the info, infact I've implemented the large message streaming already and only when I tried sending an object along with the large file I had issues. Then as you said I tried to zip the object along with the large file but thats where I had performance issues while serializing the object and compressing it.

But now I'm streaming the large file (upto 45mb) and sending the object as a separate message but both grouped together and performance is much better this time. We're using SFTP before for file upload/download and now we are replacing the same with hornetq/ jms.

Thanks to the hornetq team for giving us this wonderful framework and the excellent support you provide.