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Mismatch client-server protocol prefix

(AbstractPlatformTransactionManager.java:757) I checked multiple times if the versions match. They do. DB server ... error. Every client request starts with a prefix that is checked by the server before handling the request. That check could fail if different ObjectDB versions are in use on the client and on the server

Internal objectdb exception when using different language on a machine

reference to a type id that doesn't exist. Could you please check the database file with the Doctor ... enhanced and caused the exceptions above. Although the enhancement check was activated: <enhancement agent="false" reflection="error" /> the enhancement check does not throw an objectdb exception


Method javax.persistence.EntityManager boolean contains( Object entity ) Check if the instance is a managed entity instance belonging to the current persistence context. Parameters: entity - entity instance Returns: boolean indicating if entity is in persistence context Throws: IllegalArgumentException - if not an entity Since: JPA 1.0

ObjectDB-2.6.9: Failed to commit transaction: Failed to set numeric value of field property Element.id using reflection

property is used instead of the original method, and then irrelevant checks are performed by ObjectDB ... " exception is thrown due to a check that was not expected to be performed for a direct access by ObjectDB ... .9_02 supports an option to disable the "Enhancement ... is old" check and error


Static Field javax.jdo.spi.JDOPermission JDOPermission SET_STATE_MANAGER An instance of JDOPermission to be used for setStateManager permission checking. Since: JDO 1.0


Static Field javax.jdo.spi.JDOPermission JDOPermission MANAGE_METADATA An instance of JDOPermission to be used for manageMetadata permission checking. Since: JDO 1.0.2


Static Method javax.jdo.spi.JDOImplHelper JDOImplHelper getInstance() Get an instance of JDOImplHelper. This method checks that the caller is authorized for JDOPermission("getMetadata"), and if not, throws SecurityException. Returns: an instance of JDOImplHelper. Throws: SecurityException


Static Field javax.jdo.spi.JDOPermission JDOPermission GET_METADATA An instance of JDOPermission to be used for getMetadata permission checking. Since: JDO 1.0


Static Field javax.jdo.spi.JDOPermission JDOPermission CLOSE_PERSISTENCE_MANAGER_FACTORY An instance of JDOPermission to be used for closePersistenceManagerFactory permission checking. Since: JDO 1.0.1


Annotation Element javax.jdo.annotations.ForeignKey String deferred Whether this foreign key is deferred (constraint is checked only at commit). Returns: whether this foreign key is deferred 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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