Cannot use an EntityTransaction while using JTA
eclipselink, glassfish, jpa, jta
Solution
As the error states, if you are using JTA for transactions, you need to use JTA.
Either use JTA UserTransaction to begin/commit the transaction, or use a RESOURCE_LOCAL persistence unit and non-jta DataSource.
See, http://en.wikibooks.org/wiki/Java_Persistence/Transactions
Problem
I'm receiving this error: ``` javax.servlet.ServletException: java.lang.IllegalStateException: Exception Description: Cannot use an EntityTransaction while using JTA. ``` While trying to use JPA and JAVAEE, Glassfish. My persistence.xml file is as follow: ``` <?xml version="1.0" encoding="UTF-8"?> <persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"> <persistence-unit name="acmeauction"> <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider> <jta-data-source>jdbc/MySQLJDBCResource</jta-data-source> <class>it.uniroma3.acme.auction.model.User</class> <class>it.uniroma3.acme.auction.model.Auction</class> <properties> <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/> <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/acmeauction"/> <property name="javax.persistence.jdbc.user" value="user"/> <property name="javax.persistence.jdbc.password" value="password"/> </properties> </persistence-unit> </persistence> ``` What i'm trying to do is to persist an object (User), in this way: ``` @ManagedBean public class UserRepository implements Serializable{ @PersistenceUnit EntityManagerFactory emf; @PersistenceContext private EntityManager em; private static UserRepository instance; /** * Gives back the singleton UserRepository singleton. */ public static UserRepository getInstance() { if (instance==null) { instance = new UserRepository(); } return instance; } private UserRepository() { emf = Persistence.createEntityManagerFactory("acmeauction"); em = emf.createEntityManager(); } /** * Save and persist a new User. */ public void save(User user) { em.getTransaction().begin(); em.persist(user); em.getTransaction().commit(); } } ``` While if it try to use UserRepository from a simple Java application, it works correctly. Thanks in advance, AN