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| <h1>JPA Usage</h1> |
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| <h1 id="_things_to_watch_out_for" class="sect0">Things to watch out for</h1> |
| <div class="sect1"> |
| <h2 id="_critical_always_set_jta_data_source_and_non_jta_data_source">Critical: Always set jta-data-source and non-jta-data-source</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Always set the value of jta-data-source and non-jta-data-source in your |
| persistence.xml file. Regardless if targeting your EntityManager usage |
| for transaction-type="RESOURCE_LOCAL" or transaction-type="TRANSACTION", |
| it’s very difficult to guarantee one or the other will be the only one |
| needed. Often times the JPA Provider itself will require both internally |
| to do various optimizations or other special features.</p> |
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| <li> |
| <p>The <em>jta-data-source</em> should always have it’s OpenEJB-specific |
| '<em>JtaManaged</em>' property set to '<em>true</em>' (this is the default)</p> |
| </li> |
| <li> |
| <p>The <em>non-jta-data-source</em> should always have it’s OpenEJB-specific |
| '<em>JtaManaged</em>' property set to '<em>false</em>'.</p> |
| </li> |
| </ul> |
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| <div class="paragraph"> |
| <p>See <a href="containers-and-resources.html">Containers and Resources</a> for how |
| to configure 'JtaManaged' and a full list of properties for DataSources.</p> |
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| <div class="sect1"> |
| <h2 id="_be_detach_aware">Be detach aware</h2> |
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| <div class="paragraph"> |
| <p>A warning for any new JPA user is by default all objects will detach at |
| the end of a transaction. People typically discover this when the go to |
| remove or update an object they fetched previously and get an exception |
| like "You cannot perform operation delete on detached object".</p> |
| </div> |
| <div class="paragraph"> |
| <p>All ejb methods start a transaction unless a) you |
| <a href="transaction-annotations.html">configure them otherwise</a> , or b) the |
| caller already has a transaction in progress when it calls the bean. If |
| you’re in a test case or a servlet, it’s most likely B that is biting |
| you. You’re asking an ejb for some persistent objects, it uses the |
| EntityManager in the scope of the transaction started around it’s method |
| and returns some persistent objects, by the time you get them the |
| transaction has completed and now the objects are detached.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="_solutions_1_call_entitymanager_merge_inside_the_bean_code_to">Solutions 1. Call EntityManager.merge(..) inside the bean code to</h3> |
| <div class="paragraph"> |
| <p>reattach your object. 1. Use PersistenceContextType.EXTENDED as in |
| '@PersistenceContext(unitName = "movie-unit", type = |
| PersistenceContextType.EXTENDED)' for EntityManager refs instead of the |
| default of PersistenceContextType.TRANSACTION. 1. If testing, use a |
| technique to execute transactions in your test code. That’s described |
| here in <a href="unit-testing-transactions.html">Unit testing transactions</a></p> |
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