cayenne-dbsync/src/main/java/org/apache/cayenne/dbsync/merge/factory/DerbyMergerTokenFactory.java [87:104]:
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    public MergerToken createSetGeneratedFlagToDb(DbEntity entity, DbAttribute column, boolean isGenerated) {
        return new SetGeneratedFlagToDb(entity, column, isGenerated) {
            @Override
            protected void appendAutoIncrement(DbAdapter adapter, StringBuffer builder) {
                throw new UnsupportedOperationException("Can't automatically alter column to identity. You need to manually alter schema.");
            }

            @Override
            protected void appendDropAutoIncrement(DbAdapter adapter, StringBuffer builder) {
                throw new UnsupportedOperationException("Can't automatically drop identity. You need to manually alter schema.");
            }

            @Override
            public boolean isEmpty() {
                return false;
            }
        };
    }
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cayenne-dbsync/src/main/java/org/apache/cayenne/dbsync/merge/factory/SQLServerMergerTokenFactory.java [115:132]:
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    public MergerToken createSetGeneratedFlagToDb(DbEntity entity, DbAttribute column, boolean isGenerated) {
        return new SetGeneratedFlagToDb(entity, column, isGenerated) {
            @Override
            protected void appendAutoIncrement(DbAdapter adapter, StringBuffer builder) {
                throw new UnsupportedOperationException("Can't automatically alter column to IDENTITY in SQLServer database. You should do this manually.");
            }

            @Override
            protected void appendDropAutoIncrement(DbAdapter adapter, StringBuffer builder) {
                throw new UnsupportedOperationException("Can't automatically alter column to drop IDENTITY in SQLServer database. You should do this manually.");
            }

            @Override
            public boolean isEmpty() {
                return false;
            }
        };
    }
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