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| <h1>Tomcat JPA</h1> |
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| <p>Tomcat + Java EE = TomEE, the Java Enterprise Edition of Tomcat. |
| With TomEE you get Tomcat with JPA added and integrated and ready to go!</p> |
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| <div class="paragraph"> |
| <p>In a plain Servlet, Filter or Listener you can do fun things like injection of JPA EntityManager or EntityManagerFactory:</p> |
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| <div class="literalblock"> |
| <div class="content"> |
| <pre>import javax.annotation.Resource; |
| import javax.persistence.EntityManager; |
| import javax.persistence.PersistenceContext; |
| import javax.servlet.http.HttpServlet; |
| import javax.transaction.UserTransaction; |
| |
| public class MyServet extends HttpServlet { |
| |
| @Resource |
| private UserTransaction userTransaction; |
| |
| @PersistenceContext |
| private EntityManager entityManager; |
| |
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| @Override |
| protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { |
| //... |
| |
| userTransaction.begin(); |
| |
| try { |
| entityManager.persist(new Movie("Quentin Tarantino", "Reservoir Dogs", 1992)); |
| entityManager.persist(new Movie("Joel Coen", "Fargo", 1996)); |
| entityManager.persist(new Movie("Joel Coen", "The Big Lebowski", 1998)); |
| } finally { |
| userTransaction.commit(); |
| } |
| |
| //... |
| } |
| |
| }</pre> |
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| <p>No need to add even a single library! |
| To make the above work all you need is a <code>WEB-INF/persistence.xml</code> file in your webapp like the following:</p> |
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| <div class="literalblock"> |
| <div class="content"> |
| <pre><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> |
| |
| <properties> |
| <property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)"/> |
| </properties> |
| </persistence-unit> |
| </persistence></pre> |
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| <p>DataSources will automatically be created if they haven’t be configured explicitly.</p> |
| </div> |
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| <p><a href="download-ng.html">Download</a> TomEE and you’re minutes away from a functioning JPA application on Tomcat.</p> |
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| <div class="paragraph"> |
| <p>Unresolved directive in <stdin> - include::apache-tomee.adoc[leveloffset=+1]</p> |
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