About EntityManagerFactory

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JPA Doc
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JPA Miscellaneous

This section contains miscellaneous JPA types. The PersistenceUtil and PersistenceUnitUtil interfaces provide general utility methods: The Cache interface and the CacheRetrieveMode and CacheStoreMode enum types serve in managing the EntityManagerFactory's shared (level 2) cache: Other enum types are provided for setting of various JPA operations:
Manual
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JPA Primary Key

is obtained from the EntityManagerFactory. The getIdentifier method takes one argument, a managed entity
JPA Doc
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JPA Queries

queries as well as of criteria query elements. It can be obtained either by the EntityManagerFactory's
Result
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Posting to ObjectDB Website - Important Instructions

static void main(String[] args) {         EntityManagerFactory emf =             Persistence
Tutorial
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Step 2: Define a JPA Entity Class

. The next step is adding a context listener class that will manage a JPA's EntityManagerFactory representing the ObjectDB database.
Tutorial
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Step 2: Define a JPA Entity Class

is adding a context listener class that will manage a JPA's EntityManagerFactory representing the ObjectDB database.
Tutorial
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Step 3: Add a Main Class

if it doesn't exist yet): EntityManagerFactory emf = Persistence
Tutorial
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Step 3: Add a Main Class

yet): EntityManagerFactory emf =  Persistence.createEntityManagerFactory
Tutorial
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Step 6: Set the Spring XML

.orm.jpa.JpaTransactionManager">
Tutorial
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Step 6: Set the Spring XML

.springframework.orm.jpa.JpaTransactionManager">