Jndi api tutorial and reference pdf
Developer GuideIn this section ,we are discussing a simple JNDI tutorial with simple examples. The SPI enables to plug in various naming and directory services. The Java applications can use these services using the API. This concept is explained below as a schematic. These are inbuilt by default. If we need other providers , then we can download it from this list.
Java Message Service - JMS - JMS API - JNDI - Java Tutorial
Thus, to use JNDI, you must also have available an implementation of a naming and directory service. This makes life a lot more difficult for application developers because they need to know all the APIs for the different naming and directory services used in their enterprise, thus leading to harder-to-maintain code. Figure shows the architecture of a client and multiple services that each provides its own API. A service provider is basically a driver that your application can use to communicate with a directory service. The JNDI classes and interfaces are divided into five main packages: javax.
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JBoss AS offers several mechanisms to retrieve components by name. The layout of this namespace is primarily governed by the Java EE specification. Applications which share the same JBoss AS instance can use this namespace to intercommunicate. In addition to local JNDI, a variety of mechanisms exist to access remote components. For Java EE applications the recommended way is to use a deployment descriptor to create the binding. For example the following web.
Tomcat provides a JNDI InitialContext implementation instance for each web application running under it, in a manner that is compatible with those provided by a Java Enterprise Edition application server. Tomcat provides a number of Tomcat specific options for JNDI resources that cannot be specified in web. These include closeMethod that enables faster cleaning-up of JNDI resources when a web application stops and singleton that controls whether or not a new instance of the resource is created for every JNDI lookup. Tomcat maintains a separate namespace of global resources for the entire server. The InitialContext is configured as a web application is initially deployed, and is made available to web application components for read-only access. Each subsection below details the configuration and usage of the standard resource factories. See Adding Custom Resource Factories for information about how to create, install, configure, and use your own custom resource factory classes with Tomcat.
Deployments in WildFly are also modules, and do not have access to classes that are defined in jars in the application server unless an explicit dependency on those classes is defined. Module names for top level deployments follow the format deployment. This means that it is possible for a deployment to import classes from another deployment using the other deployments module name, the details of how to add an explicit module dependency are explained below. Even though in WildFly modules are isolated by default, as part of the deployment process some dependencies on modules defined by the application server are set up for you automatically. Similarly if your module contains a beans.