The provider XML element defines the fully-qualified class name implementing the JPA PersistenceProvider interface. The description element allows you to provide more details about the goals of the current Persistence Unit. For instance, by default, Spring applications use RESOURCE_LOCAL transactions, and to use JTA, you need to explicitly choose the JtaTranscationManager Spring bean. If you want to propagate changes to a single data source, then you don't need JTA, so the RESOURCE_LOCAL transaction type is a much more efficient alternative. Traditionally, Java EE applications used JTA by default, which requires having a JTA transaction manager that uses the 2PC (Two-Phase Commit) protocol to apply changes atomically to multiple sources of data (e.g., database systems, JMS queues, Caches). The transaction-type attribute defines the JPA transaction strategy, and it can take one of the following two values: Private EntityManagerFactory entityManagerFactory The persistence-unit element defines the name of the associated JPA Persistence Unit, which you can later use to reference it when using the JPA annotation to inject the associated EntityManagerFactory instance: = "HypersistenceOptimizer") The persistence tag is the root XML element, and it defines the JPA version and the XML schema used to validate the persistence.xml configuration file. Your JPA and Hibernate application and provide you tips about theĬhanges you need to make to entity mappings, configurations, queries,Īnd Persistence Context actions to speed up your data access layer. Hypersistence Optimizer is a dynamic analyzing tool that can scan The `persistence.xml configuration file is structured as follows: If you’re using Maven, you can store it in the resources folder, like this: src/main/resources/META-INF/persistence.xml Traditionally, the persistence.xml is located in a META-INF folder that needs to reside in the root of the Java classpath. I'm using Eclipse Java EE IDE Web Developers (Indigo Release): This is how my in 'Core' mode configured. I am unsure of what to create and where to place it. I'm trying to use Hibernate JPA but I need to create my persistence.xml (so I can use the entity manager correctly).
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