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Index Definition

which fields to define with indexes should be done carefully. Single Field Index JPA does not define ... can only be defined on ordinary persistent fields (not on primary key / version fields). Composite Index ... the lexicographic order of the words and is not ordered by the length of the words. The bottom line
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JPA Persistence Unit

. If not specified, the first JPA implementation that is found is used. The mapping-file elements ... . If the application is not packed in a JAR yet, ObjectDB (as an extension) automatically registers ... -file elements (for registration of all the classes in the jar file). ObjectDB does not enforce
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Auto Generated Values

allocation will not be used. Therefore, this strategy does not guarantee there will be no gaps in ... a sequence using a table to support this strategy. ObjectDB does not have tables, so the TABLE and SEQUENCE
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Is ObjectDB better than competing object databases?

Naturally, this is not the place to look for an unbiased answer for this question ... databases do not support user defined primary keys, even though this is very useful in ... that an essential feature is missing. For example, some competing products do not support aggregate
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JPA Metamodel API

(); If managed classes are not listed in the persistence unit (which is optional when using ObjectDB ... can also be used with types that are still unknown to ObjectDB (not listed in the persistence unit and have not been used yet). In this case, calling the method introduces the specified type to ObjectDB
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Working with JPA Entity Objects

this state the object is not yet associated with an EntityManager and has no representation in ... the Configuration chapter. By default, managed entity objects that have not been modified or removed ... is cleared all of its managed entities become detached and any changes to entity objects that have not
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javax.persistence.metamodel.MappedSuperclassType

with given name Throws: IllegalArgumentException - if attribute of the given name is not present in ... - if attribute of the given name is not present in the managed type Since: JPA 2.0 CollectionAttribute<?,E ... : IllegalArgumentException - if attribute of the given name and type is not present in the managed type Since: JPA 2.0
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javax.persistence.metamodel.IdentifiableType

of the given name is not present in the managed type Since: JPA 2.0 Set< Attribute<?,?>> getAttributes ... : IllegalArgumentException - if attribute of the given name is not present in the managed type ... type Throws: IllegalArgumentException - if attribute of the given name and type is not present in
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javax.persistence.metamodel.EntityType

Throws: IllegalArgumentException - if attribute of the given name is not present in the managed type ... : IllegalArgumentException - if attribute of the given name is not present in the managed type ... type Throws: IllegalArgumentException - if attribute of the given name and type is not present in
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javax.persistence.criteria.PluralJoin

to all collection types. It is not intended to be used directly in query construction. Since: JPA 2.0 ... upon the expression, returning a new expression object. This method does not cause type conversion: the runtime type is not changed. Warning: may result in a runtime failure. Parameters: type - intended type

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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