Stop camel route if MQ becomes unavailable

Question

I have one of the camel route as follows, there are many routes.

  from("jms:queue:TEST.LQ?transacted=true&connectionFactory=jmsConnectionFactory&cacheLevelName=CACHE_NONE")
  .routeId("routeid")
  .autoStartup("true")
  .transacted("requried")
  ....
  ....

I getting below error if TEST.LQ MQ or Queue manager is unavailable.

 ERROR [JmsConsumer[TEST.LQ]] [] [o.a.c.c.j.DefaultJmsMessageListenerContainer      ] Could not refresh JMS Connection for destination

I tried to handle exception by catching below code, but JmsMessageListenerContainer only throws the message not an exceptiom

 onException(MQException.class, JMSException.class)

How stop route if IF MQ is not available?

score 1 · Answer 1 · answered Sep 10 '20 at 18:12

1

The camel jms component has the option for this -

Add the testConnectionOnStartup=true option in your from(uri) :

from("jms:queue:TEST.LQ?transacted=true&connectionFactory=jmsConnectionFactory&cacheLevelName=CACHE_NONE&testConnectionOnStartup=true")

This will throw an exception if a connection is not available during startup which can then be handled.

More details are available in the jms-component page

answered Sep 10 '20 at 18:12

Prasanth

96
3

the above works only when camel start. but my requirement is to stop the route if MQ is not available in middle. – sree1611 Sep 11 '20 at 08:33
you could write a timer route, that does a health check on the JMS connection (enable them using spring-boot actuator). Once health check fails, stop the route and enable them when the connection is healthy – srikant_mantha May 12 '21 at 18:48

score 0 · Answer 2 · answered Sep 11 '20 at 21:06

@sree1611,

You can add exceptionListener or errorHandler query parameter in camel jms uri. To create your own exception listener, implement org.apache.camel.spi.ExceptionHandler To create your own error handler, implement org.springframework.util.ErrorHandler

I hope errors while consuming from MQ can't be bridged with camel error handlers, so you can't catch JMS exceptions (occurred during message consumption from MQ) in onException().

Stop camel route if MQ becomes unavailable

2 Answers2