Why do I not get all of the messages I sent

 FAQ > Errors > Why do I not get all of the messages I sent

For ActiveMQ Classic 3.x/4.x

As Matt reported its possible that there is a race condition in your application; are you sure you had created your consumer and called start() on the JMS Connection before the producer started publishing messages?

Another option if startup race conditions are a problem is to use durable messaging.