The kodo.MetaDataFactory
configuration property controls metadata loading and
storing. This property takes a plugin string (see
Section 2.4, “Plugin Configuration”) describing
a concrete
kodo.meta.MetaDataFactory implementation.
A metadata factory can load mapping information as well as persistence
metadata, or it can leave mapping information to a separate
mapping factory (see
Section 7.5, “Mapping Factory”).
Kodo recognizes the following built-in metadata factories:
jpa: Standard JPA metadata.
This is an alias for the
org.apache.openjpa.persistence.PersistenceMetaDataFactory.
jdo: Standard JDO metadata. This is an
alias for the
kodo.jdo.JDOMetaDataFactory,
which has the following configurable property:
ScanTopDown: This boolean property
controls whether Kodo looks for metadata files top-down
in the package tree. Kodo defaults to bottom-up
scanning, meaning that when scanning for metadata for
class C, Kodo looks first for
C.jdo, then package.jdo
in C's package, then
package.jdo in the parent package,
and so forth to the package root.
kodo3: Kodo 3.x metadata compatibility.
This compatibility factory recognizes Kodo 3.x metadata
extensions. It is an alias for the
kodo.jdo.DeprecatedJDOMetaDataFactory.
JPA has built-in settings for listing your persistent classes, which the JPA Overview describes. Kodo supports these JPA standard settings by translating them into its own internal metadata factory settings. The standard metadata factories all accept the following properties for locating persistent classes. Each property represents a different mechanism for locating persistent types; you can choose the mechanism or combination of mechanisms that are most convenient. See Section 5.1, “Persistent Class List” for a discussion of when it is necessary to list your persistent classes.
Types: A semicolon-separated list of
fully-qualified persistent class names.
Resources: A semicolon-separated list of
resource paths to metadata files or jar archives.
Each jar archive will be scanned for
annotated JPA entities
or
JDO metadata files
based on your metadata factory.
URLs: A semicolon-separated list of URLs
of metadata files or jar archives.
Each jar archive will be scanned for
annotated JPA entities
or
JDO metadata files
based on your metadata factory.
ClasspathScan: A semicolon-separated list of
directories or jar archives listed in your classpath.
Each directory and jar archive will be scanned for
annotated JPA entities
or
JDO metadata files
based on your metadata factory.
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