The Java EE Specification mandates the existence of a default instance for each of the following resources:

• Context Service

• Datasource

• JMS Connection Factory

• Managed Executor Service

• Managed Scheduled Executor Service

• Managed Thread Factory

The EE subsystem looks up the default instances from JNDI, using the names in the default bindings configuration, before placing those in the standard JNDI names, such as java:comp/DefaultManagedExecutorService:

  <default-bindings
	context-service="java:jboss/ee/concurrency/context/default"
	datasource="java:jboss/datasources/ExampleDS"
	jms-connection-factory="java:jboss/DefaultJMSConnectionFactory"
	managed-executor-service="java:jboss/ee/concurrency/executor/default"
	managed-scheduled-executor-service="java:jboss/ee/concurrency/scheduler/default"
	managed-thread-factory="java:jboss/ee/concurrency/factory/default" />