Hi Folks,
I'm hoping this is an easy one to answer for some of you.
Been using AMQ 4.1.1 for a couple of months now, and only just noticed
that messages on topics with durable subscriptions were not being persisted
across restarts, which seems like a bit of problem :confused:. At a high
level, here are the steps I follow:
- Disable all consumers
- Put a few messages on topic
- Verify topic size is non zero using JMX
- Restart AMQ
- Notice topic size is zero again.
The message producer definitely sets the
javax.jms.DeliveryMode#PERSISTENT flag (we use Spring's JmsTemplate), and
the broker is configured as follows :
<broker useJmx="true" xmlns="http://activemq.org/config/1.0";
brokerName="localhost"
dataDirectory="${activemq.home}/activemq-data/"
>
[[SNIP]]
<persistenceAdapter>
<journaledJDBC journalLogFiles="5"
dataDirectory="${activemq.home}/activemq-data/journaledJDBC"/>
</persistenceAdapter>
[[SNIP]]
</broker>
I've also tried several combinations of the following :
- AMQ Versions 4.1.1, 4.1.2 & 5.0.0
- PersistenceAdapter kaha & journaledJDBC for the 4.1.x and
amqPersistenceAdapter for 5.0.0
- Within the journaledJDBC, 2 different data sources, mysql & derby
embedded.
- Set persistent="true" on the <broker>
What am I missing? I've spent the better part of today scouring the internet
for leads, and reading through documentation with little success. If someone
could right this ship, I'd really appreciate it.
I guess more specifically, the questions I've been unable to answer:
- Is AMQ capable of preserving messages across restarts?
- Is AMQ capable of preserving messages across restarts using an embedded
derby instance?
- And the golden ticket : does anybody have configuration they can share to
make it so ? :-D
Regards,
Deepak.
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