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Hibernate 2 had a CodeGenerator tool that allowed you to create a skeleton Hibernate mapping file directly from your POJOs. Hibernate 3 no longer provides this tool. Instead, you can use the new Annotations facility (see 4), but currently this is still at a beta release level, and even with a production release it will oblige you to use Java 5, which may not be an option for many users. We suggest that as an interim measure you should use XDoclet and its associated markup tags. The XDoclet XML generation tool allows you to use JavaDoc style @ tags in the comments preceding classes and methods to indicate how you would like these to be represented in the mapping files. The tool integrates into your Ant build tool and we think it works well in reducing the burden of this task on the developer. It is worth getting to know XDoclet even if you decide to use other mechanisms for mapping file generation, as the tool can be used for generation of XML files in a number of other circumstances. See the XDoclet home page at http://xdoclet.sourceforge.net/xdoclet/index.html for more details. See the sample code for this chapter for examples of XDoclet style markup. An alternative to annotations and XDoclet is the MiddleGen tool (http://boss.bekk.no/boss/ middlegen/), which takes the reverse view and generates code from your mapping files. You could also consider the Hibernate tools project (http://tools.hibernate.org/) that includes Eclipse IDE plug-ins to generate mappings but this is currently only at an alpha release level of maturity.

In this case I am going to use a data access object based authentication provider: DaoAuthenticationProvider. This provider assumes that the user s identity is stored in a relational database. To retrieve this information, it employs a data access object. The DAO is configured using the userDetailsService property. The principal and credential combination fetched from the database is matched with the one passed by the provider manager in the Authentication object. If there s a successful match, an Authentication object with the user role list will be passed to the provider manager. A failure results in an AuthenticationException being raised, indicating a failed identity validation. The DAOs used by the DaoAuthenticationProvider should implement the UserDetailsService interface. This again is a single method interface and defines the method loadUserByUsername. Spring Security provides two ready-made implementations of this interface, as shown in Figure 6-6.

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In the Entity Overview section, it was stated that a specific API call needs to be invoked before an entity actually gets persisted to the database In fact, separate API calls are needed to perform many of the operations on entities This API is implemented by the entity manager and encapsulated almost entirely within a single interface called EntityManager When all is said and done, it is to an entity manager that the real work of persistence is delegated Until an entity manager is used to actually create, read, or write an entity, the entity is nothing more than a regular (nonpersistent) Java object When an entity manager obtains a reference to an entity, either by having it explicitly passed in as an argument to a method call or because it was read from the database, that object is said to be managed by the entity manager.

The set of managed entity instances within an entity manager at any given time is called its persistence context Only one Java instance with the same persistent identity may exist in a persistence context at any time For example, if an Employee with a persistent identity (or id) of 158 exists in the persistence context, then no other Employee object with its id set to 158 may exist within that same persistence context Entity managers are configured to be able to persist or manage specific types of objects, read and write to a given database, and be implemented by a particular persistence provider (or provider for short) It is the provider that supplies the backing implementation engine for the entire Java Persistence API, from the EntityManager through to implementation of the query classes and SQL generation All entity managers come from factories of type EntityManagerFactory.

InMemoryDaoImpl is suitable for quick prototyping and testing. For real-world use, you need to use JdbcDaoImpl or provide a custom implementation. The UserDetailsService

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