Resource and JNDI

Reference

Ch 1.9.2 of Java EE 7 Tutorial

Chapter 3 of Java EE 7 Tutorial

Resource & JNDI

Resource

• direct look-up through JNDI interface

• @Resource annotation

• deployment descriptor

JNDI

• naming environment - a naming environment allow a component to be customized without need to access / change source code

• naming context - container implements the component's environment and provide it to the component as a JNDI naming context

• JNDI interface - javax.naming.InitialContext

• Component's environment naming context (system provided): under java:comp/env

• User-defined objects:

  • should be named within a subcontext of the naming environment according to the type

  • enterprise bean: java:comp/env/ejb

  • JDBC data source: java:comp/env/jdbc

  • GlassFish default data source: java/comp/DefaultDataSource

DataSource

• JDBC API

• getConnection

• pooling

  • type - PooledConnection

  • has no effect on application code

  • (like all connections) should always be explicitly closed