Java Naming and Directory Interface

Java Naming and Directory Interface ( JNDI ) is an application programming interface (API) within the Java programming language for naming services and directory services. Using this interface, data and object references can be filed based on a name and accessed by users of the interface.

The interface is independent of the actual implementation. Rather, JNDI is a so-called Service Provider Interface (SPI ) that allows manufacturers to integrate their own solutions in this framework.

In practice, JNDI is mainly used to search databases and registration, distributed objects on a network and call via Remote Method Invocation.

The API includes:

  • A mechanism for binding an object to a name
  • Methods for the retrieval of information based on a name
  • An event concept, to be informed about the client about changes
  • Special extensions for LDAP functionality

JNDI enables the support of virtually all kinds of naming and directory services, in particular by:

JNDI Lookup

Lookup is the process by which the named objects be determined ( English for " Lookup ").

In the JNDI names are arranged hierarchically. Names are usually strings like " com.mydomain.MyBean ", but can also be any object that implements the interface javax.naming.Name. In the name or directory service, either the assigned object itself is stored for each name or a JNDI reference to the associated object. The programming interface from JNDI ( " JNDI API") defines where to look for the object. The initial context is it usually the starting point.

In the simplest case, an initial context is sufficient to search for a name:

Hashtable args = new Hashtable ();   / / First need the context factory and thus the / / Implementation of the JNDI provider will be defined: args.put ( Context.INITIAL_CONTEXT_FACTORY, " com.jndiprovider.TheirContextFactory ");   / / Then the URL that defines where to find the data: args.put ( Context.PROVIDER_URL, " jndiprovider -database ");   / / So that you get in the simplest case, the initial context: Context myCurrentContext = new InitialContext ( args);   / / Using this context can then objects / / That have been previously linked to the context, see: Object reference = myCurrentContext.lookup ( " com.mydomain.MyBean "); see also

  • Spring ( Framework) - declarative use of JNDI
Java remote method invocation Object (computer science)
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