About Apache JDO
About Apache JDO
Welcome to Apache JDO, a project of the
Apache DB
project
. Our goal is a thriving community of users and developers of
object persistence technology.
Java Data Objects (JDO) is a standard way to access persistent data in
databases, using plain old Java objects (POJO) to represent persistent
data. The approach separates data manipulation (done by accessing Java
data members in the Java domain objects) from database manipulation
(done by calling the JDO interface methods). This separation of concerns
leads to a high degree of independence of the Java view of data from the
database view of the data.
Interfaces are defined for the user’s view of persistence:
PersistenceManager: the component responsible for the life cycle of
persistent instances, Query factory, and Transaction access
Query: the component responsible for querying the datastore and
returning persistent instances or values
Transaction: the component responsible for initiating and completing
transactions
JDO is being developed as a Java Specification Request in the Java
Community Process. The original JDO 1.0 is
JSR-12
and the current JDO 3.2
is
JSR-243
The Apache JDO project is focused on building the JDO API and the TCK
for compatibility testing of JDO implementations. Commercial and open
source implementations of JDO are available for relational databases,
object databases, and file systems. If you need an implementation for
building a JDO application, see
Implementations
JDO News
JDO 3.2.1 is released
JDO 3.2.1 has been released. This release contains minor bug fixes, such
as support for Java 18, fixed warnings when using Java 9, and migration
of schema descriptor URLs to db.apache.org. For a complete list of changes
(features plus bug fixes) see
JDO 3.2.1
changes
. You can download the release from the
downloads page
. You can also use the new release in
maven projects simply by referencing the jdo-api artifact in your
pom.xml.
JDO 3.2 is released
JDO 3.2 has been released. This release contains minor bug fixes and several
new features, such as support for
Optional
, typesafe queries and an upgrade
to JDK 1.8. For a
complete list of changes (features plus bug fixes) see
JDO 3.2
changes
. You can download the release from the
downloads page
. You can also use the new release in
maven projects simply by referencing the jdo-api artifact in your
pom.xml.
JDO 3.1 is released
JDO 3.1 has been released. This release contains minor bug fixes. For a
complete list of changes (features plus bug fixes) see
JDO 3.1
changes
JDO 3.1-rc1 is released
JDO 3.1-rc1 has been released. This release contains minor bug fixes.
For a complete list of changes (features plus bug fixes) see
JDO
3.1-rc1 changes
JDO 3.0.1 is released
JDO 3.0.1 has been released. This release contains minor bug fixes. For
a complete list of changes (features plus bug fixes) see
JDO
3.0.1 changes
JDO 3.0 is released
JDO 3.0 has been released. This release contains significant new
features for better support of tooling and runtime: enhancer API,
dynamic class and metadata generation, locking, database timeouts, query
cancel, and exact object ids. For a complete list of changes (features
plus bug fixes) see
JDO 3.0
changes
JDO 2.2 is released
JDO 2.2 has been released. The JDO 2.2 maintenance release
provides support for copyOnAttach control, dynamic fetch groups, level2
caching control via metadata. For details, see
ChangeLog
for JSR-0243 JavaTM Data Objects 2.2
JDO 2.1.1 is released
JDO 2.1.1 has been released. This is a minor bug fix release.
JDO 2.1 is released
JDO 2.1 has been released. The JDO 2.1 maintenance release
provides support for JDK 1.5 features,including the use of annotations
as a means of specifying mapping. It also includes many corrections and
minor changes. For details, see
Change
Log for JSR-000243 JavaTM Data Objects 2.0
JDO 2.0 has been approved by the JCP
JDO 2.0 has been released.xs JDO 2.0 builds on JDO 1 and
includes many features requested by users:
Standard mapping from objects to relational databases
Multi-tier support without use of Data Transfer Objects
Improved query support including projections and aggregates
Stored queries in metadata
Deletion by query
Optimized fetching of object graphs without writing special queries
Extensive List and Map support
Lazy loading of large collections
Improved support for single-field primary keys
Object lifecycle event monitoring
Improved support for bidirectional relationships
Java Community Process!
JDO is being developed under the Java Community Process. The Apache JDO
project is developing the API and the Technology Compatibility Kit for
the JDO standard.
Users!
We’d love to have you involved. Check out the
Wiki
. Check out the
Specification
, which has been
approved.
Get Involved
Archived articles are
here
US