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| <title>3. XA Transactions</title><link rel="stylesheet" href="css/docbook.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.72.0"><link rel="start" href="manual.html" title="Apache OpenJPA User's Guide"><link rel="up" href="ref_guide_deploy.html" title="Chapter 8. Deployment"><link rel="prev" href="ref_guide_enterprise_trans.html" title="2. Integrating with the Transaction Manager"><link rel="next" href="ref_guide_runtime.html" title="Chapter 9. Runtime Extensions"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">3. |
| XA Transactions |
| </th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ref_guide_enterprise_trans.html">Prev</a> </td><th width="60%" align="center">Chapter 8. |
| Deployment |
| </th><td width="20%" align="right"> <a accesskey="n" href="ref_guide_runtime.html">Next</a></td></tr></table><hr></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="ref_guide_enterprise_xa"></a>3. |
| XA Transactions |
| </h2></div></div></div><div class="toc"><dl><dt><span class="section"><a href="ref_guide_enterprise_xa.html#ref_guide_enterprise_xa_req">3.1. |
| Using OpenJPA with XA Transactions |
| </a></span></dt></dl></div><a class="indexterm" name="d0e28173"></a><a class="indexterm" name="d0e28178"></a><p> |
| The X/Open Distributed Transaction Processing (X/Open DTP) model, designed by |
| <a xmlns:xlink="http://www.w3.org/1999/xlink" href="http://www.xopen.org" target="_top">Open Group</a> (a vendor consortium), |
| defines a standard communication architecture that provides the following: |
| </p><div class="itemizedlist"><ul type="disc"><li><p> |
| Concurrent execution of applications on shared resources. |
| </p></li><li><p> |
| Coordination of transactions across applications. |
| </p></li><li><p> |
| Components, interfaces, and protocols that define the architecture and provide |
| portability of applications. |
| </p></li><li><p> |
| Atomicity of transaction systems. |
| </p></li><li><p> |
| Single-thread control and sequential function-calling. |
| </p></li></ul></div><p> |
| The X/Open DTP XA standard defines the application programming interfaces that a |
| resource manager uses to communicate with a transaction manager. The XA |
| interfaces enable resource managers to join transactions, to perform two-phase |
| commit, and to recover in-doubt transactions following a failure. |
| </p><div class="section" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="ref_guide_enterprise_xa_req"></a>3.1. |
| Using OpenJPA with XA Transactions |
| </h3></div></div></div><p> |
| OpenJPA supports XA-compliant transactions when used in a properly configured |
| managed environment. The following components are required: |
| </p><div class="itemizedlist"><ul type="disc"><li><p> |
| A managed environment that provides an XA compliant transaction manager. |
| Examples of this are application servers such as WebLogic or JBoss. |
| </p></li><li><p> |
| Instances of a <code class="classname">javax.sql.XADataSource</code> for each of the |
| <code class="classname">DataSource</code>s that OpenJPA will use. |
| </p></li></ul></div><p> |
| Given these components, setting up OpenJPA to participate in distributed |
| transactions is a simple two-step process: |
| </p><div class="orderedlist"><ol type="1"><li><p> |
| Integrate OpenJPA with your application server's transaction manager, as |
| detailed in <a href="ref_guide_enterprise_trans.html" title="2. Integrating with the Transaction Manager">Section 2, “ |
| Integrating with the Transaction Manager |
| ”</a> above. |
| </p></li><li><p> |
| Point OpenJPA at an enlisted <code class="classname">XADataSource</code>, and configure |
| a second non-enlisted data source. See |
| <a href="ref_guide_dbsetup_thirdparty.html#ref_guide_dbsetup_thirdparty_enlist" title="2.1. Managed and XA DataSources">Section 2.1, “ |
| Managed and XA DataSources |
| ”</a>. |
| </p></li></ol></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ref_guide_enterprise_trans.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ref_guide_deploy.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ref_guide_runtime.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">2. |
| Integrating with the Transaction Manager |
| </td><td width="20%" align="center"><a accesskey="h" href="manual.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 9. |
| Runtime Extensions |
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