Interfaces and constants - Java interop

Dear All,I have the followings strange case in Java:
public interface LeaseContext<T>  extends net.jini.core.lease.Lease {        T getObject();         java.lang.String getUID();}
where
package net.jini.core.lease;
public interface Lease  {    long FOREVER = 9223372036854775807L;     long ANY = -1L;    int DURATION = 1;    int ABSOLUTE = 2;        long getExpiration();        void cancel() throws net.jini.core.lease.UnknownLeaseException, java.rmi.RemoteException;         void renew(long l) throws net.jini.core.lease.LeaseDeniedException, net.jini.core.lease.UnknownLeaseException, java.rmi.RemoteException;        void setSerialFormat(int i);         int getSerialFormat();        net.jini.core.lease.LeaseMap createLeaseMap(long l);        boolean canBatch(net.jini.core.lease.Lease lease);}
In java, if I do LeaseContext.FOREVER that works, in Scala I am forced to do Lease.FOREVER. Why is there such a difference?
Best Regards and Merry Christmas
Edmondo