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Connection is closed Caused by: java.io.EOFException

="8mb" stdout="false" stderr="false" /> <log-archive path="$objectdb/log/archive/" retain="90 ... " page="2kb" /> <recovery enabled="true" sync="false" path="." max="128mb" /> <recording enabled="false" sync="false" path="." mode="write" /> <locking version-check="true" /> <processing


Annotation Element javax.persistence.MapKeyJoinColumn boolean nullable (Optional) Whether the foreign key column is nullable. Default value: false Since: JPA 2.0


of state. Parameters: entity - entity instance whose load state is to be determined Returns: false if the entity has not been loaded, else true Since: JPA 2.0

isLoaded(entity, attributeName)

of attribute whose load state is to be determined Returns: false if entity's state has not been loaded or


on it will throw the IllegalStateException, except for isOpen, which will return false


addition to any constraint entailed by primary key mapping and to constraints specified at the table level. Default value: false Since: JPA 2.0


Static Method javax.jdo.JDOHelper boolean isDetached( Object pc ) Tests whether the parameter instance has been detached. Instances that have been detached return true. Transient instances return false. Parameters: pc - the instance Returns: true if this instance is detached. Since: JDO 2.0 See Also: PersistenceCapable.jdoIsDetached()


Static Method javax.jdo.JDOHelper boolean isDeleted( Object pc ) Tests whether the parameter instance has been deleted. Instances that have been deleted in the current transaction return true. Transient instances and instances of classes that do not implement PersistenceCapable return false

retrieveAll(useFetchPlan, pcs)

fetch group. If the useFetchPlan parameter is false, this method behaves exactly as the corresponding


Annotation Element javax.jdo.annotations.Element String generateForeignKey Generate or assume a foreign key constraint exists on the column or columns associated with this join. Specify "true" or "false". Returns: whether to generate or assume a primary key constraint Default value: "" Since: JDO 2.1

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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