What do you mean by jndi

Consider the following limitations when relying on JNDI state replication:. Although OC4J processes can be organized into groups known as islands to improve state-replication performance, EJB applications replicate state between all OC4J processes in the OC4J instance and do not use the island subgrouping.

Consequently, JNDI clustering is not limited to an island subnet. If there are multiple islands on a single subnet, then all islands on that subnet share the global JNDI context.

Rebinding renaming and unbinding are not propagated: they apply locally but are not shared across the cluster. If you bind a remote object typically a home or EJB object in an application context, then that JNDI object is shared across the cluster but there is a single point of failure if the first server it is bound to fails. Skip Headers. Additions made to the context at run time are not persisted. However, anything that is bound declaratively through the various XML files is reconstructed upon startup.

Because the code in the static block is executed as the class is being loaded, the JNDI environment context is not yet set up. Even during runtime, the bean is in the "does not exist" stage. In this stage of the life cycle, the JNDI environment context is undefined, and the bean provider cannot rely on it to be available. This property specifies which initial context factory to use when creating a new initial context object. This property specifies the URL that the application client code uses to look up objects on the server.

This property specifies the user name. Required in application client code to authenticate the client. Not required for server-side code, because the authentication has already been performed. This property specifies the password. Note: If your application is a J2EE client that is, it has an application-client. The protocol itself is specified by the JNDI property java. When two or more clients in the same process retrieve an InitialContext , OC4J returns a cached context.

Thus, each client receives the same InitialContext , which is assigned to the process. Server lookup, which results in server load balancing, happens only if the client retrieves its own InitialContext. If you set dedicated. When each client has its own InitialContext , then the clients can be load balanced.

The dedicated. You can supply multiple hosts for failover in a comma-separated list. Check this property and remove com. C ontext. It is not required for server-side code because authentication has already been performed.

This property name is also defined as java. Accessing Objects from an Application Client This section contains an example of how to configure an application client to access an EJB running inside an OC4J instance in the same location. ApplicationClientInitialContextFactory java. ApplicationClientInitialContextFactory" ; env. E xample As a concrete example, consider a servlet that must retrieve a data source to perform a JDBC operation on a database.

Specify data source location in data-sources. If a new thread is started from the current one, the principal associated with the parent thread is propagated to the child thread also.

A thread may be associated with only one principal at a time. If a single thread creates several contexts without closing any contexts, the thread will be associated with the principal that was used for the creation of the last context.

If you do not specify these properties, the user is logged on as Guest. This means that the lookup operation itself as well as all the operations performed over the objects returned by the lookup executions will be performed with the permissions configured for the Guest user. If this property is not specified, the authentication of the user is made according to the default policy configuration of the naming service. Using a custom policy configuration requires using also a custom security callback handler.

If you do not specify the callback handler implementation explicitly, the JNDI Registry Service will use the default one. In addition to setting this property to the InitialContext , you have to adjust the corresponding login module stack that the naming service uses during the authentication process. More information: Remote Authentication. Server-side clients that are running on the same server process do not need to specify any properties.

Use the InitialContext constructor without parameters:. We recommend that you do not specify any environment properties. This is the typical initial context creation pattern for Java EE 5 applications and other server-side components.

A client that is running on a certain server process in an AS Java cluster can obtain a context to the naming system of another cluster or instance:. The connection can be made to the naming system either via the message server of the AS Java cluster or via the ICM of the targeted Java instance. What does YACC mean? What is the full form of YACC? What does FIH mean? What is the full form of FIH? Leave a Reply Cancel reply You must be logged in to post a comment. What is the full form of BEEO?

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