EJBs support two types of transaction management: Container managed and Bean managed. Container managed transactions provide a transactional context for calls to bean methods, and are defined using Java annotations or the deployment descriptor file ejb-jar.xml. Bean managed transactions are controlled directly using the Java Transaction API (JTA) .
In both cases, you can set the Transaction Timeout for your EJBs using annotations or XML descriptors.
Check this tutorial to learn more about it: How to increase the Transaction Timeout in JBoss / WildFly
On the other hand, if you want to learn more about the JTA Transaction Timeout, we recommend the following reading: Configuring Transactions (JTA) using JBoss / Wildfly
JBoss AS 5
If you are using an older version of the application server, you can set the transaction timeout in the jboss-service.xml file ( available in the conf directory)
<mbean code="com.arjuna.ats.jbossatx.jta.TransactionManagerService"
name="jboss:service=TransactionManager">
<attribute name="TransactionTimeout">300</attribute>
<attribute name="ObjectStoreDir">${jboss.server.data.dir}/tx-object-store</attribute>
</mbean>
Modify the TransactionTimeout attribute as you need.
Note: The timeout attribute is in seconds not in milliseconds !