[jboss-dev-forums] [JBoss AS 7 Development] - AS7, EJB3, JSF, JPA2: LazyInitializationException

jabu10245 [https://community.jboss.org/people/jabu10245] created the discussion "AS7, EJB3, JSF, JPA2: LazyInitializationException" To view the discussion, visit: https://community.jboss.org/message/648068#648068 -------------------------------------------------------------- Hello Forum, I'm new to AS7 etc. and I'm trying to create a little EAR project in the Standalone environment. Here's my project configuration (using Maven): *myapp.ear:* <ear>/META-INF/application.xml: [...] <module><ejb>myapp-ejb.jar</ejb></module> <module><web><web-uri>myapp-jsf.war</web-uri></web></module> <library-directory>lib</library-directory> <ear>/lib/commons-lang.jar <ear>/myapp-ejb.jar <ear>/myapp-jsf.war *myapp-ejb.jar:* <jar>/META-INF/beans.xml => empty beans.xml <jar>/META-INF/persistence.xml: [...] <persistence-unit name="primary">     <jta-data-source>java:jboss/datasources/ExampleDS</jta-data-source>     <properties>         <property name="hibernate.hbm2ddl.auto" value="create-drop" />     </properties> </persistence-unit> and an EJB (for testing purpose as singleton): @LocalBean @Named("fooManager") @Singleton @Startup public class FooManagerBean implements FooManager {     private @PersistenceContext EntityManager entityManager;       public Foo getFoo(String name) { /* JPA lookup using entityManager */ } } The class Foo is just a mapped entity having Foos as children: @Entity @Table(name = "foo") public class Foo implements Serializable {     @Column(name = "name", nullable = false, unique = true, length = 64)     private String name;       @ManyToOne     private Foo parent;  // nullable       @OneToMany(mappedBy = "parent")     private List<Foo> children;       // Getters and Setters, hashCode, equals, toString } *myapp-jsf.war:* <war>/WEB-INF/beans.xml => empty beans.xml <war>/WEB-INF/faces-config.xml => empty JSF 2.0 config xml <war>foo.xhtml => displays all root foos with all their children => +*LazyInitializationException*+ @Named @RequestScoped public class FooController implements Serializable { [...] } The FooController uses the @EJB FooManager to load all root Foo objects, the foo.xhtml should display them with all their children. The root Foo objects are being loaded correctly, but when I try to access the children a LazyInitializationException is being thrown, because I access them outside the transaction scope of the Entity Manager from the FooManager. My question is: Is there something like Spring's OpenEntityManagerInViewInterceptor? I googled it and found some descriptions using Seam, but I have no experience with that. Is Seam party of JBoss AS7? Or do I have to include it in my WAR as a dependency? What version should I use? Or is there any simpler way solving my problem? Thanks to anyone who can point me to a solution ;-) -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/648068#648068] Start a new discussion in JBoss AS 7 Development at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]