musikolo/java-object-mapper-benchmark

JMH benchmark of Java object-to-object mapping frameworks

Object-to-object mapping framework microbenchmark

Multi-layered applications often require to map between different object models (e.g. DTOs and entities). Writing such boiler plate mapping code is a tedious and error-prone task. A lot of object-to-object mapping Java frameworks aims to simplify this work and automate it. Some uses code instrospection (eg. Dozer). Other uses code generation (ex: MapStuct). This micro-benchmark compares performance of 6 frameworks. Results could be compared to the benchmark of a code written manually.

Benchmark are powered by a tool called JMH or also known as "Java Microbenchmarking Harness". JMH is developed by the OpenJDK team.

Benchmarked object to object mapper frameworks

• Dozer
• MapStruct
• ModelMapper
• Selma
• Orika
• JMapper

Contributing to benchmark

Github is for social coding platform: if you want to add another mapping framework or optimize an existing one, we encourage contributions through pull requests from forks of this repository. If you want to contribute code this way, please reference a GitHub ticket as well covering the specific issue you are addressing.

Data model

The data model used by this benchmark is very basic. It comes from the Comparison class from the ModelMapper framework. It includes combinations which usually appear in Java Beans, such as:

• Object types
• Collections

Launch the benchmark

Pre-requisites: Maven 3.x and a JDK 6 (or above)

git clone git://github.com/arey/java-object-mapper-benchmark.git

mvn clean install

java -jar target/benchmarks.jar

Results

Tests has been performed on:

• OS: OS X El Capitan
• CPU: 3.1 GHz Intel Core i7, 2 cores, L2 Cache (per Core): 256 KB, L3 Cache: 4 MB
• RAM: 16 GB 1867 MHz DDR3
• JVM: Oracle 1.8.0_102 64 bits

Benchmark	Mode	Samples	Score	Margin error (+/-)	Units
Manual	thrpt	200	16 449 065	53 680	ops/s
Selma	thrpt	200	15 806 337	41 094	ops/s
MapStruct	thrpt	200	14 237 194	51 179	ops/s
JMapper	thrpt	200	13 960 300	58 236	ops/s
Orika	thrpt	200	3 014 113	14 411	ops/s
ModelMaper	thrpt	200	246 365	2 019	ops/s
Dozer	thrpt	200	78 140	349	ops/s

Legend : Higher score is better

Total time: 00:48:33

Documentation

• Micro-benchmark of Java mapping object frameworks (french article)

Credits

• Uses Maven as a build tool
• Uses JMH for Java Microbenchmarking Harness