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The motivation behind the Open Session in View (OSIV) pattern is that the view pulls information from business objects by navigating the object network beginning at some detached object for example, the newly created Bid instance that was placed in the request context by your action. The view that is, the page that must be rendered and displayed accesses this detached object to get the content data for the page. In a Hibernate application, there may be uninitialized associations (proxies or collections) that must be traversed while rendering the view. In this example, the view may list all items sold by the bidder (as part of an overview screen) by calling newBid.getBidder().getItems().iterator(). This is a rare case but certainly a valid access. Because the items collection of the User is loaded only on demand (Hibernate s lazy association and collection default behavior), it isn t initialized at

this point. You can not load uninitialized proxies and collections of an entity instance that is in detached state. If the Hibernate Session and therefore the persistence context is always closed at the end of the action s execute() method, Hibernate throws a LazyInitializationException when this unloaded association (or collection) is accessed. The persistence context is no longer available, so Hibernate can t load the lazy collection on access.

classpath dest package src <classpath> Classpath to be used for this compilation. [Path] Directory containing the source JSPs. [File] Package under which the compiled classes go. [String] Directory containing the source JSPs. [File] Adds a path to the classpath. [Path]

Why can t Hibernate open a new Session if it has to lazy load objects The Hibernate Session is the persistence context, the scope of object identity. Hibernate guarantees that there is at most one in-memory representation of a particular database row, in one persistence context. Opening a Session on-demand, behind the scenes, would also create a new persistence context, and all objects loaded in this identity scope would potentially conflict with objects loaded in the original persistence context. You can t load data on-demand when an object is out of the guaranteed scope of object identity when it s detached. On the other hand, you can load data as long as the objects are in persistent state, managed by a Session, even when the original transaction has been committed. In such a scenario, you have to enable the autocommit mode, as discussed in chapter 10, section 10.3, Nontransactional data access. We recommend that you don t use the autocommit mode in a web application; it s much easier to extend the original Session and transaction to span the whole request. In systems where you can t easily begin and end a transaction when objects have to be loaded on-demand inside a Session, such as Swing desktop applications that use Hibernate, the autocommit mode is useful.

args beahome classpath domain home jvmargs name password pkpassword policy properties Additional argument string passed to the WebLogic instance; optional. [String] The location of the BEA Home; implicitly selects WebLogic 6.0; optional. [File] The classpath to be used with the Java Virtual Machine that runs the WebLogic Server; required. [Path] Domain to run in; required for WL6.0. [String] The location where WebLogic lives. [File] Additional arguments to pass to the WebLogic JVM. [String] The name of the WebLogic server within the WebLogic home that is to be run. [String] Management password of the server; optional and only applicable to WL6.0. [String] Private key password so the server can decrypt the SSL private key file; optional and only applicable to WL6.0. [String] The name of the security policy file within the WebLogic home directory that is to be used. [String] The name of the server s properties file within the WebLogic home directory used to control the WebLogic instance; required for WL4.5.1. [String]

A first solution would be to ensure that all needed associations and collections are fully initialized before forwarding to the view (we discuss this later), but a more convenient approach in a two-tiered architecture with a colocated presentation and persistence layer is to leave the persistence context open until the view is completely rendered. The OSIV pattern allows you to have a single Hibernate persistence context per request, spanning the rendering of the view and potentially multiple action execute()s. It can also be implemented easily for example, with a servlet filter:

Management username to run the server; optional and only applicable to WL6.0. [String] Name of the main class for WebLogic; optional. [String] WebLogic classpath used by the WebLogic server; optional, and only applicable to WL4.5.1. The WebLogic classpath is used by WebLogic to support dynamic class loading. [Path] Adds the classpath for the user classes. [Path] Gets the classpath to the WebLogic classpaths. [Path]