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<title>ObjectDB</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">ObjectDB</span></span>

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</style><table class="infobox vevent"><tbody><tr><th colspan="2" class="infobox-above summary">ObjectDB Object Database</th></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Programmer" title="Programmer">Developer(s)</a></th><td class="infobox-data">ObjectDB Software</td></tr><tr style="display: none;"><td colspan="2" class="infobox-full-data"></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Software_release_life_cycle" title="Software release life cycle">Stable release</a></th><td class="infobox-data"><div style="margin:0px;">2.9.4

/ June 13, 2025<span style="display:none"> (<span class="bday dtstart published updated">2025-06-13</span>)</span></div></td></tr><tr style="display:none"><td colspan="2">

</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Written in</th><td class="infobox-data"><a href="Java_(programming_language)" title="Java (programming language)">Java</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Operating_system" title="Operating system">Operating system</a></th><td class="infobox-data"><a href="Cross-platform" class="mw-redirect" title="Cross-platform">Cross-platform</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Software_categories#Categorization_approaches" title="Software categories">Type</a></th><td class="infobox-data"><a href="Object_database" title="Object database">Object database</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="Software_license" title="Software license">License</a></th><td class="infobox-data"><a href="Proprietary_software" title="Proprietary software">Proprietary</a><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Website</th><td class="infobox-data"><span class="url"><a rel="nofollow" class="external text" href="http://www.objectdb.com">www<wbr>.objectdb<wbr>.com</a></span></td></tr></tbody></table>

<p><b>ObjectDB</b> is an <a href="Object_database" title="Object database">object database</a> for <a href="Java_(programming_language)" title="Java (programming language)">Java</a>. It can be used in client-server mode and in embedded (in process) mode.

</p><p>Unlike other object databases, ObjectDB does not provide its own proprietary API. Accordingly, working with ObjectDB requires using one of the two standard Java APIs: <a href="Java_Persistence_API" class="mw-redirect" title="Java Persistence API">JPA</a> or <a href="Java_Data_Objects" title="Java Data Objects">JDO</a>. Both APIs are built-in in ObjectDB,<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> so an intermediate <a href="Object-relational_mapping" class="mw-redirect" title="Object-relational mapping">ORM</a> software is not needed.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup>

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<div class="mw-heading mw-heading2"><h2 id="Features">Features</h2></div>

<p>ObjectDB is a cross platform software and can be used on various operating systems with Java SE 5 or higher. It can be integrated into <a href="Java_Platform%2C_Enterprise_Edition" class="mw-redirect" title="Java Platform, Enterprise Edition">Java EE</a> and <a href="Spring_Framework" title="Spring Framework">Spring</a> web applications and deployed on servlet containers (<a href="Apache_Tomcat" title="Apache Tomcat">Tomcat</a>, <a href="Jetty_(Web_server)" class="mw-redirect" title="Jetty (Web server)">Jetty</a>) as well as on Java EE application servers (<a href="GlassFish" title="GlassFish">GlassFish</a>, <a href="JBoss_application_server" class="mw-redirect" title="JBoss application server">JBoss</a>).<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> It was tested on various <a href="Java_Virtual_Machine" class="mw-redirect" title="Java Virtual Machine">JVMs</a>, including <a href="HotSpot_(virtual_machine)" title="HotSpot (virtual machine)">HotSpot</a>, <a href="JRockit" title="JRockit">JRockit</a> and <a href="IBM_J9" class="mw-redirect" title="IBM J9">IBM J9</a>.<sup id="cite_ref-features_8-0" class="reference"><a href="#cite_note-features-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup>

</p><p>The maximum database size is 128 TB (131,072 GB). The number of objects in a database is unlimited (except by the database size).<sup id="cite_ref-features_8-1" class="reference"><a href="#cite_note-features-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup>

</p><p>All the persistable types of JPA and JDO are supported by ObjectDB, including user defined entity classes, user defined embeddable classes, standard Java collections, basic data types (primitive values, wrapper values, String, Date, Time, Timestamp) and any other serializable classes.<sup id="cite_ref-features_8-2" class="reference"><a href="#cite_note-features-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup>

</p><p>Every object in the database has a unique ID. ObjectDB supports both traditional object database IDs, as well as RDBMS like primary keys, including composite primary keys and auto value generation and assignment,<sup id="cite_ref-features_8-3" class="reference"><a href="#cite_note-features-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> as part of its support of <a href="Java_Persistence_API" class="mw-redirect" title="Java Persistence API">JPA</a>, which is mainly an API for RDBMS.

</p><p>Two query languages are supported. The JDO Query Language (JDOQL), which is based on Java syntax, and the JPA Query Language (<a href="JPQL" class="mw-redirect" title="JPQL">JPQL</a>), which is based on <a href="SQL" title="SQL">SQL</a> syntax. JPA 2 criteria queries are also supported.<sup id="cite_ref-features_8-4" class="reference"><a href="#cite_note-features-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup>

</p><p>ObjectDB automatic <a href="Schema_evolution" title="Schema evolution">schema evolution</a> handles most changes to classes transparently, including adding and removing of persistent fields, changing types of persistent fields, and modifying class hierarchy. Renaming persistable classes and persistent fields is also supported.<sup id="cite_ref-features_8-5" class="reference"><a href="#cite_note-features-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup>

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<div class="mw-heading mw-heading2"><h2 id="Tools_and_utilities">Tools and utilities</h2></div>

<p>The following tools and utilities are included in the ObjectDB distribution:<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup>

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<ul><li><b>Database Explorer</b> - GUI tool for querying, viewing and editing database content.</li>

<li><b>Database Doctor</b> - Diagnoses and repairs possible database problems.</li>

<li><b>Replication</b> - Master-Slave replication (clustering) with unlimited number of slave nodes.</li>

<li><b>Online Backup</b> - Database backup by a simple query on an EntityManager.</li>

<li><b>Class Enhancer</b> - Boosts performance by preparing classes for persistence.</li>

<li><b>Transaction Replayer</b> - Recorder and replayer of database transactions.</li>

<li><b>BIRT Reports Driver</b> - Adds ObjectDB as a <a href="BIRT_Project" title="BIRT Project">BIRT</a> data source and <a href="Java_Persistence_Query_Language" class="mw-redirect" title="Java Persistence Query Language">JPQL</a> / JDOQL queries as data sets.</li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.objectdb.com/database/purchase">"ObjectDB License"</a>.</cite></span>

</li>

<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.objectdb.com/">"Home"</a>. <i>objectdb.com</i>.</cite></span>

</li>

<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://stackoverflow.com/questions/5291950/is-objectdb-production-ready">"Java - is ObjectDB production ready?"</a>.</cite></span>

</li>

<li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20120905075427/http://www.javabeat.net/2011/02/create-applications-using-objectdb-and-jpa-in-netbeans/">"Create applications using ObjectDb and JPA in NetBeans"</a>. <i>www.javabeat.net</i>. Archived from <a rel="nofollow" class="external text" href="https://www.javabeat.net/2011/02/create-applications-using-objectdb-and-jpa-in-netbeans">the original</a> on 2012-09-05.</cite></span>

</li>

</li>

<li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.objectdb.com/tutorial">"JPA Tutorials"</a>.</cite></span>

</li>

<li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.developer.com/java/web/integrate-objectdb-into-your-jpa-based-java-web-app.html">"Integrate ObjectDB into Your JPA-based Java Web App"</a>. 6 April 2012.</cite></span>

</li>

<li id="cite_note-features-8"><span class="mw-cite-backlink">^ <a href="#cite_ref-features_8-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-features_8-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-features_8-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-features_8-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-features_8-4"><sup><i><b>e</b></i></sup></a> <a href="#cite_ref-features_8-5"><sup><i><b>f</b></i></sup></a></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.objectdb.com/object/db/database/features">"ObjectDB Object Database Features"</a>.</cite></span>

</li>

<li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.objectdb.com/java/jpa/tool">"Chapter 5 - Database Tools and Utilities"</a>.</cite></span>

</li>

</ol></div></div>

<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<ul><li><span class="official-website"><span class="url"><a rel="nofollow" class="external text" href="https://www.objectdb.com/">Official website</a></span></span> </li></ul>

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