About EntityManagerFactory

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Manual
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JPA Persistence Unit

to instantiate an EntityManagerFactory in JPA (as explained in the JPA Overview section) requires ... an EntityManagerFactory. It may also have optional sub elements: The provider element indicates which JPA
Manual
12

Setting and Tuning of JPA Queries

> For an EntityManagerFactory - using the createEntityManagerFacotory method:   Map properties = new HashMap();   properties.put("javax.persistence.query.timeout", 4000);   EntityManagerFactory emf
Manual
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Locking in JPA

> For an EntityManagerFactory - using the createEntityManagerFacotory method:   MapEntityManagerFactory emf =       Persistence.createEntityManagerFactory("pu", properties); For an EntityManager
Result
12

ObjectDB Object Database Features [2018-01-27]

Automatic connection pool managed by EntityManagerFactory. Configurable - minimum/maximum connections ...  (per EntityManagerFactory). Database file page cache. Query program cache (for repeating queries
Result
12

ObjectDB Object Database Features [2018-10-27]

Automatic connection pool managed by EntityManagerFactory. Configurable - minimum/maximum connections ...  (per EntityManagerFactory). Database file page cache. Query program cache (for repeating queries
Result
12

ObjectDB Object Database Features

managed by EntityManagerFactory. Configurable - minimum/maximum connections and timeout. Caching L1 entity object cache (per EntityManager). L2 shared entity data cache (per EntityManagerFactory
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

is adding a context listener class that will manage a JPA's EntityManagerFactory representing the ObjectDB database.
Manual
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JPA Criteria API Queries

the EntityManagerFactory's getCriteriaBuilder method or by the EntityManager's getCriteriaBuilder method
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