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java.lang.NullPointerException: Map values cannot be null	at com.datastax.driver.core.TypeCodec$MapCodec.serialize(	at com.datastax.driver.core.TypeCodec$MapCodec.serialize(	at com.datastax.driver.core.AbstractData.set(	at com.datastax.driver.core.AbstractData.set(	at com.datastax.driver.core.BoundStatement.set(	at com.datastax.driver.mapping.Mapper.setObject(	at com.datastax.driver.mapping.Mapper.saveQuery(	at com.datastax.driver.mapping.Mapper.saveQuery(	at	at com.genesys.ucs.CassandraTestor.test(