how to solve java.lang.NoClassDefFoundError: javax/ejb/EJBObject?

Hi all,
i am new to JDeveloper and J2ee.
i opened an application in Jdeveloper 11, and complie it, it is fine. run it, i got error java.lang.NoClassDefFoundError: javax/ejb/EJBObject

what library i missing?

thanks a lot
Loading libraries
Exception in thread "main" java.lang.NoClassDefFoundError: javax/ejb/EJBObject
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
	at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
	at au.com.ords.commission.client.CommissionMain.<init>(CommissionMain.java:83)
	at au.com.ords.commission.client.CommissionMain.main(CommissionMain.java:992)
Caused by: java.lang.ClassNotFoundException: javax.ejb.EJBObject
	at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
	... 14 more
Library directory not found.Process exited with exit code 1.

                                
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