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java.lang.AbstractMethodError: 	at com.solarmetric.kodo.impl.jdbc.ormapping.Mapping.createMapping(Mapping.java:129)	at com.solarmetric.kodo.impl.jdbc.ormapping.Mapping.createMappings(Mapping.java:83)	at com.solarmetric.kodo.impl.jdbc.JDBCPersistenceManagerFactory.loadPersistentTypes(JDBCPersistenceManagerFactory.java:311)	at com.solarmetric.kodo.impl.jdbc.runtime.JDBCStoreManager.getClassMapping(JDBCStoreManager.java:626)	at com.solarmetric.kodo.impl.jdbc.runtime.JDBCExpressionFactory.(JDBCExpressionFactory.java:47)	at com.solarmetric.kodo.impl.jdbc.runtime.JDBCQuery.getExpressionFactory(JDBCQuery.java:42)	at com.solarmetric.kodo.query.QueryImpl.getExpression(QueryImpl.java:437)	at com.solarmetric.kodo.query.QueryImpl.getExpression(QueryImpl.java:419)	at com.solarmetric.kodo.impl.jdbc.runtime.JDBCQuery.getExpression(JDBCQuery.java:51)	at com.solarmetric.kodo.query.QueryImpl.executeWithMap(QueryImpl.java:312)	at com.solarmetric.kodo.query.QueryImpl.execute(QueryImpl.java:278)	at samples.sessionBean.stateless.StaffBean.findEmployees(UnknownSource)	at samples.sessionBean.stateless.StaffBean.staffList(UnknownSource)	at java.lang.reflect.Method.invoke(Native Method)	at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:642)	at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:77)	at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:96)	at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:167)	at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:61)	at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:127)	at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:166)	at org.jboss.ejb.StatelessSessionContainer.invoke(StatelessSessionContainer.java:308)	at org.jboss.ejb.Container.invoke(Container.java:630)	at com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1555)	at com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1523)	at org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:364)	at java.lang.reflect.Method.invoke(Native Method)	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:241)	at sun.rmi.transport.Transport$1.run(Transport.java:152)	at java.security.AccessController.doPrivileged(Native Method)	at sun.rmi.transport.Transport.serviceCall(Transport.java:148)	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:465)	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransportjava:706)	at java.lang.Thread.run(Thread.java:484)