Top "Mapper" questions

Can Hadoop mapper produce multiple keys in output?

Can a single Mapper class produce multiple key-value pairs (of same type) in a single run? We output the key-value …

hadoop key mapper

Java: Unmapped target properties

I have a problem with Mapper.I am using a mapstruct-processor to build Maven project. All time I get a …

java maven mapper mapstruct

How Java Hadoop Mapper can send multiple values

My mapper needs to send the following tuples: <custID,prodID,rate> And I want to send to reducer …

java hadoop mapper

when is an identity mapper/reducer used?

I had two conceptual doubts related to mapreduce and hadoop.I know a simple one iteration map-reduce program, know what …

hadoop mapreduce mapper

How to connect a ResultHandler in MyBatis Mapper XML

I found several examples how to connect a custom ResultHandler to a MyBatis Query: e.g. https://code.google.com/…

java xml pagination mybatis mapper

Jackson Mapper - how to fail on null or empty values

We're using Jackson JSON mapper in our code to de-serialize some configuration objects. We'd like for Jackson to fail on …

java jackson deserialization mapper

Mybatis reference sql from another mapper.xml file

I have written a standard select and resultMap for a table/object in one mapper.xml file and am wondering …

xml mybatis mapper

How do I rename files when included in a jar by ant's jar task?

I want to put a set of files that look like this into a jar: yay/my.jar boo/my.…

ant jar mapper

BO <=> DTO mapper in Java

I am currently in my application maping DTOs to BO (and vice versa) manually. However, this approach is awkward and …

java reflection dto mapper

how to exclude whole property if they are null from Modelmapper

Does ModelMapper(http://modelmapper.org/) support what exclude property? If the value is null. I just found PropertyMap out. but …

java mapper modelmapper