JNDI - Java Naming and Directory Interface
what is JNDI - its a naming service
why is it needed - in a distributed enterprise application, there are multiple resources like DB pools or business components like EJBs deployed on the Java EE containers and they need a way to locate. JNDI serves that purpose.
Applications can use annotations to locate the resource. Like datasources which are nothing but database resources, provides connection to database. when the application code refers to a
datasource and invokes JDBC API to getconnection, it gets a physical connection. In case connection pooling is implemented then it gets a handle to pooled connection object instead of direct physical connection.
These connections need to be closed and when closed will go back to the pool. The pool of database connections will give better performance and better connection handling mechanism.
Similarly JNDI mapping can be done to other services like JMS, LDAP etc.,
Below shown are some of the resources on Glassfish server and the JNDI mapping.
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