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[[Category:Concepts]] Corresponding Resin documentation is http://www.caucho.com/resin-3.0/ioc ==See Also== * <[[bean configuration tag|bean]]> * <[[resource configuration tag|resource]]> ==Overview== Inversion of Control is a fancy name for a simple concept: moving configuration code out of application code and into the container's configuration. For example, an [http://www.caucho.com/resin-3.0/db/tutorial Inversion of Control database servlet] would let the configuration file lookup a javax.sql.DataSource from JNDI and configure the servlet directly. A [http://www.caucho.com/resin-3.0/db/tutorial/jdbc-basic non-IoC database servlet] would extract the initialization parameters using getInitParameter and lookup the name in JNDI itself. Using the Inversion of Control style offers several benefits: * It decouples the application code from its configuration, e.g. removing all JNDI dependencies * It allows more flexible configuration in the configuration file. * It makes the application more easily testable, since calling setters is easier than configuring a JNDI environment. ==Inversion of Control Tutorials== * [http://www.caucho.com/resin-3.0/db/tutorial/jdbc-ioc Servlet with DataSource] * [http://www.caucho.com/resin-3.0/resource/tutorial/injection Resource Bean Configuration] * [http://www.caucho.com/resin-3.0/protocols/tutorial/hessian-ioc Hessian Configuration] * [http://www.caucho.com/resin-3.0/config/init.xtp Bean-style init]

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