The DataNucleus project provides products for the management of application data in a Java environment. Our aim is to provide good quality open source products to handle data in all of its forms, wherever it is stored. This goes from persistence of data into heterogeneous datastores, to providing methods of retrieval using a range of query languages, and eventually on to the analysis of data and tools for managing data quality.

DataNucleus Access Platform is the baseline product providing persistence of Java objects to a range of datastores using JDO and JPA APIs and permitting various query languages.

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Updated 24 Jul 2008 22:37 UTC


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    occasional JDOObjectNotFoundException

    Hello Andy,

    we have already for quite a while a [color=red]JDOObjectNotFoundException[/color] that occurs only with some certain objects while it does not occur with hundreds of other objects (same code, other data). When retrying with the ... [More] same data again (in a new transaction), the exception usually does not occur again.

    The code location where the exception occurs should never throw a ... [Less]

    [OFFTOPIC] TopLink Kodo

    See http://forums.oracle.com/forums/thread.jspa?threadID=676899&tstart=45
    [quote]Oracle's strategic Java persistence product going forward is TopLink. Kodo support and maintenance will continue to be available until the product is eventually retired.[/quote]
    Another great persistence tool bites the dust seemingly

    primary key column name in new-table inheritance strategy

    Hello, everyone. Please, take a look at this snippet if you have spare time.

    All works fine provided these two classes and meta-data below is used:
    [code]public class A {
    private String name;
    public String getName() {
    ... [More] return name;
    }
    public void setName(String name) {
    this.name = name;
    }
    }

    public class B extends A {
    private String title;

    public String getTitle() {
    ... [Less]

    JPOX Persistence Platform 1.2.3 released

    JPOX 1.2.3 is released (core, rdbms, enhancer, java5 plugins). This is a bug fix release. It fixes some issues with detachment, List.remove(int) SCO access, SCO Maps, use of application identity where the PK was not at the start of the class, and ... [More] identity generation in non-default schema for PostgreSQL.

    Please refer to [url=http://www.jpox.org/servlet/jira/secure/Dashboard.jspa]JIRA[/url] for ... [Less]

    Classpath issues with tutorial for JDO/DB4O

    Hey,

    tried to get the tutorial from the website with db4o to run - quite unsuccessful and frustrating UNTIL I spotted that the website ... [More] [url=http://www.jpox.org/docs/guides/jdo/db4o_tutorial.html]http://www.jpox.org/docs/guides/jdo/db4o_tutorial.html[/url] the package.jdo file states the classpath wrong -- seems to be a typo and jdo is swapped around with tutorial.

    After changing that the ... [Less]

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Project Cost

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Codebase 381,440
Effort (est.) 101 Person Years
Avg. Salary $ year
$ 5,551,235