[jboss-user] [EJB3] - EJB java.lang.NoClassDefFoundError: javax/persistence/EntityManager

marco squarcini do-not-reply at jboss.com
Sun Jul 7 14:23:54 EDT 2013

marco squarcini [https://community.jboss.org/people/squarcio] created the discussion

"EJB java.lang.NoClassDefFoundError: javax/persistence/EntityManager"

To view the discussion, visit: https://community.jboss.org/message/826760#826760

Hello to all,
I'm new to javaEE and JBoss AS and i'm trying to learn developing EJB applications but i have a problem i don't know how to solve.
I use NetBeans 7.3 and JBoss AS 7.1.1.
I have been created an EJB 3.1 module with an entity bean and a session bean with remote interface that performs the database operations using the entity bean.
After i have been created a java application to access the EJB module:
1. inside the library of the project i put the jboss-client.jar and the EJB module.jar files
2. i have been created a config package with the jboss-ejb-client.properties file
3. i lookup the bean with the method :

public static ControllerPrenotazioniRemote lookupRemoteControllerPrenotazioni() throws NamingException {
        final Hashtable jndiProperties = new Hashtable();
        jndiProperties.put(Context.URL_PKG_PREFIXES, "org.jboss.ejb.client.naming");

        final Context context = new InitialContext(jndiProperties);

        final String appName = "";
        final String moduleName = "EJBModule1";
        final String distinctName = "";
        final String beanName = ControllerPrenotazioni.class.getSimpleName();

        final String viewClassName = ControllerPrenotazioniRemote.class.getName();
        System.out.println("Looking EJB via JNDI ");
        System.out.println("ejb:" + appName + "/" + moduleName + "/" + distinctName + "/" + beanName + "!" + viewClassName);

        return (ControllerPrenotazioniRemote) context.lookup("ejb:/EJBModule1/ControllerPrenotazioni!"
                + ControllerPrenotazioniRemote.class.getName() + "?stateful");


I deploy the EJB module less problems,but when i try to run the java application i see thi error in the output tab of NetBeans:

Exception in thread "main" java.lang.NoClassDefFoundError: javax/persistence/EntityManager
    at controllers.ControllerPrenotazioni.trovaPrenotazione(ControllerPrenotazioni.java:133)
    at principale.Main.main(Main.java:22)
Caused by: java.lang.ClassNotFoundException: javax.persistence.EntityManager
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 2 more
Java Result: 1

I do not know where I'm wrong!Someone can help me to solve this problem?

Thank you to all in advance....

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