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JTS Java Transaction Service API
Distributed transaction context (OMG OTS)
Java language mapping of XA standard 

JIDL Java IDL API
OMG standard IDL to Java mapping (IIOP)

JNDI Java Naming and Directory Interface
Access to naming/directory services (LDAP, NIS, NIS+, NDS, DNS, COS)

JMS Java Message Service
Publish and subscribe, reliable queues