Mule CE: Database Connector and JBoss/XA Transaction work together? - jboss

Question

I would like to use JBoss/XA Transacion with Database Connector component in Mule 3.7.
But an exception is throws: Transactional action is ALWAYS_JOIN but there is no active transaction (java.lang.IllegalStateException).
My transactional scenario is:
Pool + Database component - select table A
VM Component. Just to start a transaction - ALWAYS_BEGIN
Database component - MySQL - insert table B
Database component - Oracle - insert table C
We must ensure that both inserts running and commit together or rollback together.
Following XML code:
<jbossts:transaction-manager doc:name="JBoss Transaction Manager">
<property key="com.arjuna.ats.arjuna.coordinator.defaultTimeout" value="50" />
<property key="com.arjuna.ats.arjuna.coordinator.txReaperTimeout" value="108000"/><
</jbossts:transaction-manager>
<spring:beans>
<spring:bean id="oraDataSource" class="oracle.ucp.jdbc.PoolXADataSourceImpl" name="Bean">
<spring:property name="URL" value="jdbc:oracle:thin:#//${db.host}:${db.port}/${db.instance}"/>
<spring:property name="user" value="${db.user}"/>
<spring:property name="password" value="${db.password}"/>
<spring:property name="connectionFactoryClassName" value="oracle.jdbc.xa.client.OracleXADataSource"/>
<spring:property name="minPoolSize" value="1"/>
<spring:property name="maxPoolSize" value="20"/>
<spring:property name="connectionWaitTimeout" value="30"/>
</spring:bean>
</spring:beans>
<spring:bean id="mysqlDataSource" class="com.mysql.jdbc.jdbc2.optional.MysqlXADataSource">
<spring:property name="url" value="jdbc:mysql://${mysql.host}:${mysql.port}/${mysql.instance}?user=${mysql.user}&password=${mysql.password}" />
</spring:bean>
<db:oracle-config name="Oracle_Configuration" doc:name="Oracle Configuration Bean" dataSource-ref="oraDataSource"/>
<db:mysql-config name="MySQL_Configuration" doc:name="MySQL Configuration Bean" dataSource-ref="mysqlDataSource"/>
<vm:connector name="VM" validateConnections="true" doc:name="VM"/>
<flow name="propostaFlow" processingStrategy="synchronous">
<poll doc:name="Poll">
<fixed-frequency-scheduler frequency="1000"/>
<watermark variable="carimboTempo" default-expression="2016-01-01 00:00:00" selector="MAX" selector-expression="#[payload.date_modified]"/>
<db:select config-ref="MySQL_Configuration" doc:name="Database Proposta">
<db:parameterized-query><![CDATA[select a.id, a.number, a.date_modified from table_a a where a.date_modified > #[flowVars.carimboTempo]]]></db:parameterized-query>
</db:select>
</poll>
<foreach doc:name="For Each - Proposta">
<vm:outbound-endpoint exchange-pattern="one-way" path="in" connector-ref="VM" doc:name="VM">
<xa-transaction action="ALWAYS_BEGIN" timeout="10000"/>
</vm:outbound-endpoint>
<enricher target="#[flowVars.resultadoInsert1]" doc:name="Message Enricher">
<db:insert config-ref="Oracle_Configuration" transactionalAction="ALWAYS_JOIN" doc:name="Database 1">
<db:parameterized-query><![CDATA[insert into table_b(ID, NAME) values(#[payload.id],#[payload.name])]]></db:parameterized-query>
</db:insert>
</enricher>
<db:insert config-ref="MySQL_Configuration" transactionalAction="ALWAYS_JOIN" doc:name="Database 2">
<db:parameterized-query><![CDATA[insert into table_c(ID, NAME) values(#[payload.id],#[payload.name])]]></db:parameterized-query>
</db:insert>
</foreach>
</flow>
IMPORTANT: We are using Mule 3.7.0 CE. We know that in Mule EE a solution is very easy with <transaction> and XA.
Questions:
Did we something wrong?
Is the Database Connect component aware of the JBoss/XA Transaction?
Is a correct form to start XA transaction with VM Component?
Finally, what we want to do, embed XA transaction in Mule CE, is really possible?
Thanks!

Answer 1

Based from the link you provided, since you use the driver classes oracle.jdbc.xa.client.OracleXADataSource and com.mysql.jdbc.jdbc2.optional.MysqlXADataSource you need to update the configuration like the following:
<jdbc:inbound-endpoint queryKey="selectQuery"
connector-ref="jdbcConnectorSource" pollingFrequency="10000">
<xa-transaction action="ALWAYS_BEGIN" />
</jdbc:inbound-endpoint>
<jdbc:outbound-endpoint queryKey="insert_call"
connector-ref="jdbcConnectorDest">
<xa-transaction action="ALWAYS_JOIN" />
</jdbc:outbound-endpoint>

Answer 2

Based on my experience I have found that the only way to use XA transactions is to use Mule EE.
You have to include your transactional operations (for example database update and JMS publishing ) in this block
<ee:xa-transactional action="ALWAYS_BEGIN" doc:name="Transactional">
and be sure to use database XA datasource, JMS XA connection factory and a transaction manager like this
<jbossts:transaction-manager doc:name="JBoss Transaction Manager" />
I've noticed this difference in Anypoint Studio between CE and EE.
In Mule CE transactional block, you can only specify transaction action
Instead in Mule EE you can specify transaction action and transaction type
Francesco.