Database transactions between multiple camel routes - apache-camel

Question

How transactions works in Camel routes with Spring DSL and one of the route throws Exception?
If routeB throws an exception, how exception will be propagated back to routeA.
If exception is thrown in routeB, I could see transactionalErrorHandler is handling the exception and rolling back the transaction.
Setting the errorHandlerRef="noErrorHandler" on routeB does not help.
How can we do this?
My Camel routes definition:
<route id="routeA">
<from uri="direct-vm:endpointA" />
<transacted />
<to uri="direct-vm:endPointB" />
<bean ref="beanA" method="save" />
<onException>
<exception>java.lang.Exception>
<handled><constant>true</constant></handled>
<bean ref="beanA" method="handleError" />
<rollback markRollbackOnly="true" />
</onException>
</route>
<route id="routeB">
<from uri="direct-vm:endPointB" />
<throwException ref="ex"/>
</route>

Answer 1

In camel the transacted command is simply a wrapper for the Spring TransactionTemplate, in that it will enlist the route in a transaction supplied by the PlatformTransactionManager. The only configuration option you get on the org.apache.camel.spring.spi.SpringTransactionPolicy is the propagation behaviour, so handling rollbacks etc must be done within the transacted route.
In this case you should catch the exception from route B, if it gets to the error handler then it is too late.
<route id="routeA">
<from uri="direct-vm:endpointA" />
<transacted/>
<doTry>
<to uri="direct-vm:endPointB" />
<doCatch>
<exception>java.lang.Exception</exception>
<bean ref="beanA" method="handleFail"/>
</doCatch>
<doFinally>
<bean ref="beanA" method="save" />
</doFinally>
</doTry>
</route>
<route id="routeB">
<from uri="direct-vm:endPointB" />
<throwException ref="ex"/>
</route>