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POHow to persist a property of type List<String> in JPA?
 

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  1. POHow to persist a property of type List<String> in JPA?
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    <p>What is the smartest way to get an entity with a field of type List persisted?</p> <h2>Command.java</h2> <pre><code>package persistlistofstring; import java.io.Serializable; import java.util.ArrayList; import java.util.List; import javax.persistence.Basic; import javax.persistence.Entity; import javax.persistence.EntityManager; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.Persistence; @Entity public class Command implements Serializable { @Id @GeneratedValue(strategy = GenerationType.AUTO) Long id; @Basic List&lt;String&gt; arguments = new ArrayList&lt;String&gt;(); public static void main(String[] args) { Command command = new Command(); EntityManager em = Persistence .createEntityManagerFactory("pu") .createEntityManager(); em.getTransaction().begin(); em.persist(command); em.getTransaction().commit(); em.close(); System.out.println("Persisted with id=" + command.id); } } </code></pre> <hr> <p>This code produces:</p> <pre><code>&gt; Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named pu: Provider named oracle.toplink.essentials.PersistenceProvider threw unexpected exception at create EntityManagerFactory: &gt; oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException &gt; Local Exception Stack: &gt; Exception [TOPLINK-30005] (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))): oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException &gt; Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: sun.misc.Launcher$AppClassLoader@11b86e7 &gt; Internal Exception: javax.persistence.PersistenceException: Exception [TOPLINK-28018] (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))): oracle.toplink.essentials.exceptions.EntityManagerSetupException &gt; Exception Description: predeploy for PersistenceUnit [pu] failed. &gt; Internal Exception: Exception [TOPLINK-7155] (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))): oracle.toplink.essentials.exceptions.ValidationException &gt; Exception Description: The type [interface java.util.List] for the attribute [arguments] on the entity class [class persistlistofstring.Command] is not a valid type for a serialized mapping. The attribute type must implement the Serializable interface. &gt; at oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:143) &gt; at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.createEntityManagerFactory(EntityManagerFactoryProvider.java:169) &gt; at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:110) &gt; at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:83) &gt; at persistlistofstring.Command.main(Command.java:30) &gt; Caused by: &gt; ... </code></pre>
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