adam bien's blog

Starting with JDK 8u60+ the built-in Nashorn engine is capable to convert Json content into java.util.Map. No external dependencies are required for parsing:

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Map;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

public class JSONParsingTest {

    private ScriptEngine engine;

    @Before
    public void initEngine() {
        ScriptEngineManager sem = new ScriptEngineManager();
        this.engine = sem.getEngineByName("javascript");
    }

    @Test
    public void parseJson() throws IOException, ScriptException {
        String json = new String(Files.readAllBytes(/*path*/);
        String script = "Java.asJSONCompatible(" + json + ")";
        Object result = this.engine.eval(script);
        assertThat(result, instanceOf(Map.class));
        Map contents = (Map) result;
        contents.forEach((t, u) -> {
        //key-value pairs
        });
    }
}

Also see official Nashorn extensions documentation.

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