Rabbitmq & JSON Messages

[Sally Fikry]

I built a java client to read from rabbitmq, then republish to an exchange.

This works very well with text messages, but when it comes to JSON messages, the behavior is inconsistent.
Sometimes the it is not properly displayed, sometimes has unreadable chars at the start and some other time works just fine.

I'm setting the content-type='application/

json' while publish the message.

The data is just received and sent as a byte [] with UTF-8 encoding.

Is there any special handling that should be done for JSON messages?

[Michael Klishin]

RabbitMQ always receives and delivers immutable binary blobs. It's up to client

libraries how they encode, decode and otherwise treat message bodies.

Java and .NET clients simply pass the blogs down to consumers you register, that's it.

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MK

Staff Software Engineer, Pivotal/RabbitMQ

[Sally Fikry]

My java client also read & publish the messages also as blobs with no message manipulation, but the display of JSON on the rabbitmq mngmt console is not consistent.
When I display the output to a file rather than the output queue, it is displayed correctly.

[Michael Klishin]

RabbitMQ management UI doesn't pay attention to the content type either. I suspect that it is an escaping

issue of some kind in the UI code.

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[Sally Fikry]

Would you elaborate more on this point? & how can I trace the cause on this problem?

My client doesn't have any UI, just java code.

On Wednesday, October 26, 2016 at 6:48:36 PM UTC+2, Sally Fikry wrote:

[Michael Klishin]

I thought you were referring to the RabbitMQ management UI.

RabbitMQ does not care what payload encoding is used. Inspect your publishers and consumers. Capturing traffic with Wireshark can be quite useful as well. There is a guide on rabbitmq.com.

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[V Z]

We send and receive json all the time with no issues. I would review what your app is doing first.

[Sally Fikry]

After a lot of investigations, it seems like the output buffer is overridden, that's why we see misplaced output.
I need help to know if my code is thread safe or not,

Here's the scenario:
- I created a single queuing consumer (so single thread) that listens to a certain rabbitmq queue and waits for the next delivery inside a loop.
- each delivery triggers a construction of JSON message, converted to a new byte array then to be sent to a rabbitmq exchange using a routing key.

I'm using basicPublish method and it is said to be blocking calls and thread safe in the documentation.

What could go wrong with  this scenario to cause this behavior?

[Arnaud Cogoluegnes]

Your scenario looks correct, but we'd need more information. The problem could be in the JSON document creation (not RabbitMQ-related, and JSON libs are usually thread-safe, but we never know) or also some bug in the frame creation in the Java client (unlikely, many people are doing what you do and don't complain).

Is this reproducible in a simple program or even better in a test?

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