Somtimes RequestTimedOutIOException when many messages

Hi,

I have ActiveMQ broker (5.6.0), and spring-JMS producer (3.0). It works great, but when the JMS-producer have many messages to sent, I sometimes get:

'org.springframework.jms.UncategorizedJmsException : Uncategorized
exception occured during JMS processing; nested exception is
javax.jms.JMSException:
org.apache.activemq.transport.RequestTimedOutIOExc eption'

although all the messages are actually being sent to the broker.