Julien Serdaru [https://community.jboss.org/people/jserdaru] created the discussion "OnAllSubTasksEndParentEndStrategy java.lang.VerifyError: Cannot inherit from final class" To view the discussion, visit: https://community.jboss.org/message/817868#817868 -------------------------------------------------------------- Hi there,  I am trying to set up a local task service using JPA persistence and hibernate.  Environment: Java 6, Hibernate 4.1.7, jBPM 5.4.0.Final  When creating the entity manager factory I get the following exception when hibernate tries to instantiate the class OnAllSubTasksEndParentEndStrategy.  {code} Caused by: java.lang.VerifyError: Cannot inherit from final class      at java.lang.ClassLoader.defineClass1(Native Method)      at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)      at java.lang.ClassLoader.defineClass(ClassLoader.java:615)      at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)      at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)      at java.net.URLClassLoader.access$000(URLClassLoader.java:58)      at java.net.URLClassLoader$1.run(URLClassLoader.java:197)      at java.security.AccessController.doPrivileged(Native Method)      at java.net.URLClassLoader.findClass(URLClassLoader.java:190)      at java.lang.ClassLoader.loadClass(ClassLoader.java:306)      at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)      at java.lang.ClassLoader.loadClass(ClassLoader.java:247)      at java.lang.Class.forName0(Native Method)      at java.lang.Class.forName(Class.java:247)      at org.hibernate.internal.util.ReflectHelper.classForName(ReflectHelper.java:170)      at org.hibernate.ejb.Ejb3Configuration.classForName(Ejb3Configuration.java:1318) {code}  Looking at that class, I see that it inherits the enum SubTasksStrategy.  I thought extending an enum was prohibited in Java. Am I missing something here?  Thanks for the help!  My persistence.xml {code}                 jdbc/jbpm-ds           org.jbpm.task.Attachment          org.jbpm.task.BooleanExpression          org.jbpm.task.Comment          org.jbpm.task.Content          org.jbpm.task.Deadline          org.jbpm.task.Delegation          org.jbpm.task.EmailNotification          org.jbpm.task.EmailNotificationHeader          org.jbpm.task.Escalation          org.jbpm.task.Group          org.jbpm.task.I18NText          org.jbpm.task.Notification          org.jbpm.task.OnAllSubTasksEndParentEndStrategy          org.jbpm.task.OnParentAbortAllSubTasksEndStrategy          org.jbpm.task.PeopleAssignments          org.jbpm.task.Reassignment          org.jbpm.task.Status          org.jbpm.task.SubTasksStrategy          org.jbpm.task.Task          org.jbpm.task.TaskData          org.jbpm.task.User {code} -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/817868#817868] Start a new discussion in jBPM at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]