> This error was resolved! But now emerged this error:
>
> Exception occurred during event dispatching:
> javax.ejb.EJBException: nested exception is: java.rmi.ServerException:
> RemoteException occurred in server thread; nested exception is:
> java.rmi.RemoteException: null; nested exception is:
> java.lang.AbstractMethodError:
> org.firebirdsql.jdbc.FBConnection.getClientInfo()Ljava/util/Properties;
> java.rmi.ServerException: RemoteException occurred in server thread; nested
> exception is:
> java.rmi.RemoteException: null; nested exception is:
> java.lang.AbstractMethodError:
> org.firebirdsql.jdbc.FBConnection.getClientInfo()Ljava/util/Properties;

It looks like somebody (server, I suspect) is still using JDK 6.0. The
method getClientInfo() was introduced in JDBC 4.0, which appeared in JDK
6.0. The exception AbstractMethodError means that the method is
abstract, which in our case means that you have a driver for the
previous version of JDBC/JDK.

Please, check your JDKs carefully.

Roman