PrependFieldNameToJoinTableInverseJoinColumns: Whether to prepend the owning field name to the names of inverse join columns in join tables. Defaults to true per the JPA specification. Set to false for compatibility with older OpenJPA versions which did not prepend the field name.

DefaultMissingInfo: Whether to default missing column and table names rather than throw an exception. If set to false, full explicit mappings are required at runtime and when using mapping tool actions like buildSchema and validate.

RemoveHungarianNotation: Switches on/off removal of Hungarian notation when generating column names. Fields such as mFoobar and strBarFoo would become columns named foobar and barfoo respectively. OpenJPA will search for the first instance of a uppercase character in the field name and then truncate the column name to remove anything before it.

BaseClassStrategy: The default mapping strategy for base classes. You can specify a built-in strategy alias or the full class name of a custom class strategy. You can also use OpenJPA's plugin format (see Section 4, “ Plugin Configuration ”) to pass arguments to the strategy instance. See the org.apache.openjpa.jdbc.meta.strats package for available strategies.

SubclassStrategy: The default mapping strategy for subclasses. You can specify a builtin strategy alias or the full class name of a custom class strategy. You can also use OpenJPA's plugin format (see Section 4, “ Plugin Configuration ”) to pass arguments to the strategy instance. Common strategies are vertical and flat, the default. See the org.apache.openjpa.jdbc.meta.strats package for all available strategies.

VersionStrategy: The default version strategy for classes without a version field. You can specify a builtin strategy alias or the full class name of a custom version strategy. You can also use OpenJPA's plugin format (see Section 4, “ Plugin Configuration ”) to pass arguments to the strategy instance. Common strategies are none, state-comparison, timestamp, and version-number, the default. See the org.apache.openjpa.jdbc.meta.strats package for all available strategies.

DiscriminatorStrategy: The default discriminator strategy when no discriminator value is given. You can specify a builtin strategy alias or the full class name of a custom discriminator strategy. You can also use OpenJPA's plugin format (see Section 4, “ Plugin Configuration ”) to pass arguments to the strategy instance. Common strategies are final for a base class without subclasses, none to use joins to subclass tables rather than a discriminator column, and class-name, the default. See the org.apache.openjpa.jdbc.meta.strats package for all available strategies.

FieldStrategies: This property associates field types with custom strategies. The format of this property is similar to that of plugin strings (see Section 4, “ Plugin Configuration ” ), without the class name. It is a comma-separated list of key/value pairs, where each key is a possible field type, and each value is itself a plugin string describing the strategy for that type. We present an example below. See Section 10.3, “ Custom Field Mapping ” for information on custom field strategies.

ForeignKeyDeleteAction: The default delete action of foreign keys representing relations to other objects. Recognized values include restrict, cascade, null , default. These values correspond exactly to the standard database foreign key actions of the same names.

The value none tells OpenJPA not to create database foreign keys on relation columns. This is the default.

JoinForeignKeyDeleteAction: The default delete action of foreign keys that join secondary, collection, map, or subclass tables to the primary table. Accepts the same values as the ForeignKeyDeleteAction property above.

DeferConstraints: Whether to use deferred database constraints if possible. Defaults to false.

IndexLogicalForeignKeys: Boolean property controlling whether to create indexes on logical foreign keys. Logical foreign keys are columns that represent a link between tables, but have been configured through the ForeignKey properties above not to use a physical database foreign key. Defaults to true.

DataStoreIdColumnName: The default name of datastore identity columns.

DiscriminatorColumnName: The default name of discriminator columns.

IndexDiscriminator: Whether to index the discriminator column. Defaults to true.

VersionColumnName: The default name of version columns.

IndexVersion: Whether to index the version column. Defaults to false.

AddNullIndicator: Whether to create a synthetic null indicator column for embedded mappings. The null indicator column allows OpenJPA to distinguish between a null embedded object and one with default values for all persistent fields.

NullIndicatorColumnName: The default name of synthetic null indicator columns for embedded objects.

OrderLists: Whether to create a database ordering column for maintaining the order of persistent lists and arrays.

OrderColumnName: The default name of collection and array ordering columns.

StoreEnumOrdinal: Set to true to store enum fields as numeric ordinal values in the database. The default is to store the enum value name as a string, which is more robust if the Java enum declaration might be rearranged.

StoreUnmappedObjectIdString: Set to true to store the stringified identity of related objects when the declared related type is unmapped. By default, OpenJPA stores the related object's primary key value(s). However, this breaks down if different subclasses of the related type use incompatible primary key structures. In that case, stringifying the identity value is the better choice.