Cast/boxing/unboxing of numbers Java 9

[Paulo Oliveira]

Hello,

Testing some nashorn scripts on java 9 I got some unexpected behavior.
The code:

import java.util.Arrays;
import java.util.List;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

public class Main {

    public static void main(String[] args) throws Exception{
        ScriptEngine scriptEngine = new
ScriptEngineManager().getEngineByName("Nashorn");
        scriptEngine.eval("var imports = new JavaImporter(java.lang.Integer, " +
                "java.lang.Long);" +
                "var fun1 = function(longs, ints, id) {" +
                "with(imports) {" +
                "print(id.getId().class);" +
                "print(longs.contains(id.getId()));" +
                "print(ints.contains(id.getId()));" +
                "return Long.valueOf(1);" +
                "}" +
                "};");
        Invocable invocable = (Invocable) scriptEngine;

        List<Long> longs = Arrays.asList(1L, 2L);
        List<Integer> ints = Arrays.asList(1, 2);
        Teste teste = new Teste(1L);
        Object result = invocable.invokeFunction("fun1", longs, ints, teste);
        System.out.println(result.getClass());
    }
}

public class Teste {


    private Long id;

    public Teste(Long id) {
        this.id =id;
    }

    public Long getId() {
        return id;
    }
}


Executing the code
It produces:

Java 8.161
class java.lang.Long
true
false
class java.lang.Long

Java 9.0.4 and 10
class java.lang.Long
false
true
class java.lang.Integer

Nashorn is changing every number that fits a Integer in Integers, even if I
explicit define as Long.
This causes a problem on List.contains, because it receives a Object, if I
try to verify if a long exists in a list of longs, it returns false.

Is it a expected behavior ?
-- 
*Paulo Oliveira*
*Desenvolvedor BackEnd*

*TEL:* +55 (11)  3634-3378
www.ifood.com.br




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