Adam Bien JSON Parser Benchmark

execute.sh

mvn clean package && java -jar target/jmh-abien-json-1.0-SNAPSHOT.jar -f  1

MyBenchmark.java

package com.innoq;

import java.util.Map;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;

@State(Scope.Benchmark)
public class MyBenchmark {

    private ScriptEngine engine;
    private ObjectMapper mapper;
    private String json;

    @Setup
    public void setUp() throws Exception {
        engine = new ScriptEngineManager().getEngineByName("javascript");
        mapper = new ObjectMapper();
        json = "{ \"foo\": \"bar\", \"bar\": 1 }";
    }

    @Benchmark
    public Object nashorn() throws Exception {
        Map<String, Object> map = (Map<String, Object>) engine.eval("Java.asJSONCompatible(" + json + ")");
        return map.get("foo");
    }

    @Benchmark
    public Object jackson() throws Exception {
        Map<String, Object> map = mapper.readValue(json, Map.class);
        return map.get("foo");
    }

}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.innoq</groupId>
  <artifactId>jmh-abien-json</artifactId>
  <version>1.0-SNAPSHOT</version>

  <properties>
    <encoding>UTF-8</encoding>

    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>

    <jackson.version>2.6.3</jackson.version>
    <jmh.version>1.11.1</jmh.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>${jackson.version}</version>
    </dependency>
    <dependency>
      <groupId>org.openjdk.jmh</groupId>
      <artifactId>jmh-core</artifactId>
      <version>${jmh.version}</version>
    </dependency>
    <dependency>
      <groupId>org.openjdk.jmh</groupId>
      <artifactId>jmh-generator-annprocess</artifactId>
      <version>${jmh.version}</version>
      <scope>provided</scope>
    </dependency>
  </dependencies>


  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>2.2</version>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>shade</goal>
            </goals>
            <configuration>
              <transformers>
                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                  <mainClass>org.openjdk.jmh.Main</mainClass>
                </transformer>
              </transformers>
              <filters>
                <filter>
                  <artifact>*:*</artifact>
                  <excludes>
                    <exclude>META-INF/*.SF</exclude>
                    <exclude>META-INF/*.DSA</exclude>
                    <exclude>META-INF/*.RSA</exclude>
                  </excludes>
                </filter>
              </filters>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

</project>

Interesting.
What about memory consumption? How does that compare?