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             <div class='page-header'>

               <h1>OpenJPA</h1>
             </div>
           </div>
         </div>
         <div class="row">

             <div class="col-md-12">
                 <div id="preamble">
 <div class="sectionbody">
 <div class="paragraph">
 <p>OpenJPA is bundled with OpenEJB as the default persistence provider.</p>
 </div>
 <div class="paragraph">
 <p>An example of working <code>persistence.xml</code> for OpenJPA:</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-xml" data-lang="xml">&lt;persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0"&gt;

   &lt;persistence-unit name="movie-unit"&gt;
     &lt;jta-data-source&gt;movieDatabase&lt;/jta-data-source&gt;
     &lt;non-jta-data-source&gt;movieDatabaseUnmanaged&lt;/non-jta-data-source&gt;
     &lt;class&gt;org.superbiz.injection.jpa.Movie&lt;/class&gt;

     &lt;properties&gt;
       &lt;property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)"/&gt;
     &lt;/properties&gt;
   &lt;/persistence-unit&gt;
 &lt;/persistence&gt;</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p>Where the datasources above are configured in your openejb.xml as
 follows:</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-xml" data-lang="xml">&lt;Resource id="movieDatabase" type="DataSource"&gt;
   JdbcDriver = org.hsqldb.jdbcDriver
   JdbcUrl = jdbc:hsqldb:mem:moviedb
 &lt;/Resource&gt;

 &lt;Resource id="movieDatabaseUnmanaged" type="DataSource"&gt;
   JdbcDriver = org.hsqldb.jdbcDriver
   JdbcUrl = jdbc:hsqldb:mem:moviedb
   JtaManaged = false
 &lt;/Resource&gt;</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p>Or in properties as follows:</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">p.put("movieDatabase", "new://Resource?type=DataSource");
 p.put("movieDatabase.JdbcDriver", "org.hsqldb.jdbcDriver");
 p.put("movieDatabase.JdbcUrl", "jdbc:hsqldb:mem:moviedb");

 p.put("movieDatabaseUnmanaged", "new://Resource?type=DataSource");
 p.put("movieDatabaseUnmanaged.JdbcDriver", "org.hsqldb.jdbcDriver");
 p.put("movieDatabaseUnmanaged.JdbcUrl", "jdbc:hsqldb:mem:moviedb");
 p.put("movieDatabaseUnmanaged.JtaManaged", "false");</code></pre>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_common_exceptions">Common exceptions</h2>
 <div class="sectionbody">
 <div class="sect2">
 <h3 id="_table_not_found_in_statement">Table not found in statement</h3>
 <div class="paragraph">
 <p>Or as derby will report it "Table 'abc.xyz' doesn&#8217;t exist"</p>
 </div>
 <div class="paragraph">
 <p>Someone has to create the database structure for your persistent
 objects. If you add the <em>openjpa.jdbc.SynchronizeMappings</em> property as
 shown below OpenJPA will auto-create all your tables, all your primary
 keys and all foreign keys exactly to match your objects.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-xml" data-lang="xml">&lt;persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0"&gt;

  &lt;persistence-unit name="movie-unit"&gt;
    &lt;!-- your other stuff --&gt;

    &lt;properties&gt;
      &lt;property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)"/&gt;
    &lt;/properties&gt;
  &lt;/persistence-unit&gt;
 &lt;/persistence&gt;</code></pre>
 </div>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_auto_commit_can_not_be_set_while_enrolled_in_a_transaction">Auto-commit can not be set while enrolled in a transaction</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>Pending</p>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_this_broker_is_not_configured_to_use_managed_transactions">This broker is not configured to use managed transactions.</h2>
 <div class="sectionbody">
 <div class="sect2">
 <h3 id="_setup">Setup</h3>
 <div class="paragraph">
 <p>Using a EXTENDED persistence context &#8230;&#8203;</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">@PersistenceContext(unitName = "movie-unit", type = PersistenceContextType.EXTENDED)
 EntityManager entityManager;</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p>on a persistence unit setup as RESOURCE_LOCAL &#8230;&#8203;</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-xml" data-lang="xml">&lt;persistence-unit name="movie-unit" transaction-type="RESOURCE_LOCAL"&gt;
   ...
 &lt;/persistence-unit&gt;</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p>inside of a transaction.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">@TransactionAttribute(TransactionAttributeType.REQUIRED)
 public void addMovie(Movie movie) throws Exception {
     entityManager.persist(movie);
 }</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p>Note the default transaction attribute for any ejb method is REQUIRED
 unless explicitly set otherwise in the bean class or method in question.</p>
 </div>
 </div>
 <div class="sect2">
 <h3 id="_solutions">Solutions</h3>
 <div class="paragraph">
 <p>You can either:</p>
 </div>
 <div class="olist arabic">
 <ol class="arabic">
 <li>
 <p>Change your bean or it&#8217;s method to use
 <code>TransactionAttributeType.NOT_REQUIRED</code> or
 <code>TransactionAttributeType.NEVER</code> which will guarantee it will not be
 invoked in a JTA transaction.</p>
 </li>
 <li>
 <p>Change your persistence.xml so the persistence-unit uses
 <code>transaction-type="TRANSACTION"</code> making it capable of participating in a
 JTA transaction.</p>
 </li>
 </ol>
 </div>
 </div>
 </div>
 </div>
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	<div id="main-block" class="container main-block">
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	<div class='page-header'>

	<h1>OpenJPA</h1>
	</div>
	</div>
	</div>
	<div class="row">

	<div class="col-md-12">
	<div id="preamble">
	<div class="sectionbody">
	<div class="paragraph">
	<p>OpenJPA is bundled with OpenEJB as the default persistence provider.</p>
	</div>
	<div class="paragraph">
	<p>An example of working <code>persistence.xml</code> for OpenJPA:</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-xml" data-lang="xml"><persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0">

	<persistence-unit name="movie-unit">
	<jta-data-source>movieDatabase</jta-data-source>
	<non-jta-data-source>movieDatabaseUnmanaged</non-jta-data-source>
	<class>org.superbiz.injection.jpa.Movie</class>

	<properties>
	<property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)"/>
	</properties>
	</persistence-unit>
	</persistence></code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>Where the datasources above are configured in your openejb.xml as
	follows:</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-xml" data-lang="xml"><Resource id="movieDatabase" type="DataSource">
	JdbcDriver = org.hsqldb.jdbcDriver
	JdbcUrl = jdbc:hsqldb:mem:moviedb
	</Resource>

	<Resource id="movieDatabaseUnmanaged" type="DataSource">
	JdbcDriver = org.hsqldb.jdbcDriver
	JdbcUrl = jdbc:hsqldb:mem:moviedb
	JtaManaged = false
	</Resource></code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>Or in properties as follows:</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">p.put("movieDatabase", "new://Resource?type=DataSource");
	p.put("movieDatabase.JdbcDriver", "org.hsqldb.jdbcDriver");
	p.put("movieDatabase.JdbcUrl", "jdbc:hsqldb:mem:moviedb");

	p.put("movieDatabaseUnmanaged", "new://Resource?type=DataSource");
	p.put("movieDatabaseUnmanaged.JdbcDriver", "org.hsqldb.jdbcDriver");
	p.put("movieDatabaseUnmanaged.JdbcUrl", "jdbc:hsqldb:mem:moviedb");
	p.put("movieDatabaseUnmanaged.JtaManaged", "false");</code></pre>
	</div>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_common_exceptions">Common exceptions</h2>
	<div class="sectionbody">
	<div class="sect2">
	<h3 id="_table_not_found_in_statement">Table not found in statement</h3>
	<div class="paragraph">
	<p>Or as derby will report it "Table 'abc.xyz' doesn’t exist"</p>
	</div>
	<div class="paragraph">
	<p>Someone has to create the database structure for your persistent
	objects. If you add the <em>openjpa.jdbc.SynchronizeMappings</em> property as
	shown below OpenJPA will auto-create all your tables, all your primary
	keys and all foreign keys exactly to match your objects.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-xml" data-lang="xml"><persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0">

	<persistence-unit name="movie-unit">
	<!-- your other stuff -->

	<properties>
	<property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)"/>
	</properties>
	</persistence-unit>
	</persistence></code></pre>
	</div>
	</div>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_auto_commit_can_not_be_set_while_enrolled_in_a_transaction">Auto-commit can not be set while enrolled in a transaction</h2>
	<div class="sectionbody">
	<div class="paragraph">
	<p>Pending</p>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_this_broker_is_not_configured_to_use_managed_transactions">This broker is not configured to use managed transactions.</h2>
	<div class="sectionbody">
	<div class="sect2">
	<h3 id="_setup">Setup</h3>
	<div class="paragraph">
	<p>Using a EXTENDED persistence context …</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">@PersistenceContext(unitName = "movie-unit", type = PersistenceContextType.EXTENDED)
	EntityManager entityManager;</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>on a persistence unit setup as RESOURCE_LOCAL …</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-xml" data-lang="xml"><persistence-unit name="movie-unit" transaction-type="RESOURCE_LOCAL">
	...
	</persistence-unit></code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>inside of a transaction.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">@TransactionAttribute(TransactionAttributeType.REQUIRED)
	public void addMovie(Movie movie) throws Exception {
	entityManager.persist(movie);
	}</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>Note the default transaction attribute for any ejb method is REQUIRED
	unless explicitly set otherwise in the bean class or method in question.</p>
	</div>
	</div>
	<div class="sect2">
	<h3 id="_solutions">Solutions</h3>
	<div class="paragraph">
	<p>You can either:</p>
	</div>
	<div class="olist arabic">
	<ol class="arabic">
	<li>
	<p>Change your bean or it’s method to use
	<code>TransactionAttributeType.NOT_REQUIRED</code> or
	<code>TransactionAttributeType.NEVER</code> which will guarantee it will not be
	invoked in a JTA transaction.</p>
	</li>
	<li>
	<p>Change your persistence.xml so the persistence-unit uses
	<code>transaction-type="TRANSACTION"</code> making it capable of participating in a
	JTA transaction.</p>
	</li>
	</ol>
	</div>
	</div>
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