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Spring Data JPA - PersistenceException thrown

.Method.invoke(Method.java:497) at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.invokeProxyMethod(AbstractEntityManagerFactoryBean.java:388) at org.springframework.orm.jpa ... .objectdb.o._PersistenceException: Failed to validate xml file /<my code dir>/META-INF/orm-objectdb.xml

Persist not working when ObjectDB and another db is used in the same application (through spring) with different tx managers

" /> </bean> <bean id="entityManagerFactory"   class="org.springframework.orm.jpa ... .springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />   </property>   <property name ... ="org.springframework.orm.jpa.JpaTransactionManager">   <property name="entityManagerFactory" ref

JPA vs JDO - which is more efficient for OneToMany queries?

> orders; } @Entity class Order { } It is true, however, that in ORM-based implementations ... Order to Customer in the above example is more efficient), but that is true for both JPA and JDO ORM ... in ORM-based implementation and requires a JOIN table and a query for navigation, is implemented

Problem upgrading

.orm.jpa.JpaSystemException: Failed to set reference value of field property at.co.pjm.tracker ... .channelConfigurationSets using reflection at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:418) ~[spring-orm-4.2.3.RELEASE.jar:4.2

JPA Annotations for Relationships

Relationships are persistent fields in persistable classes that reference other entity objects. The four relationship modes are represented by the following annotations: Unlike ORM JPA implementations, ObjectDB does not enforce specifying any of the annotations above. Specifying a relationship

Updating JPA Entity Objects

. Collections are more portable to ORM JPA implementations and provide better automatic change tracking

JPA Persistence Unit

specify XML mapping files that are added to the default META-INF/orm.xml mapping file. Every annotation

Locking in JPA

some ORM JPA providers) is defined in the entity class or not. Pessimistic Locking The main


and is much faster than any ORM-based JPA implementation. ObjectDB Software's customers include fortune


.supportedOptions() String ORM_DTD_RESOURCE The name of the resource for the DTD of the standard JDO object ... -relational mapping metadata file. Since: JDO 2.1 String ORM_XSD_NS The standard JDO object-repository mapping ... is http://java.sun.com/xml/ns/jdo/orm. Since: JDO 2.1 String ORM_XSD_RESOURCE The name of the resource

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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