Java NIO -> NIO2 (UnmappableCharacterException error occur)

Sample.java

package com.sample;

import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class Sample {
    public static void main(String... args) throws IOException {
        Sample sample = new Sample();
        sample.writeNIO();
        sample.writeNIO2();
    }

    void writeNIO() {
        String val = "Pockémon";
        try (BufferedWriter writer = new BufferedWriter(
                new OutputStreamWriter(new FileOutputStream("/Users/tomo/NIO.txt"), Charset.forName("sjis")))) {
            writer.write(val);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    void writeNIO2() throws IOException {
        String val = "Pockémon";
        Path path = Paths.get("/Users", "tomo", "NIO2.txt");
        try (BufferedWriter writer = Files.newBufferedWriter(path, Charset.forName("sjis"));) {
            writer.write(val);
        }
    }
}

SampleTest.java

package com.sample;

import static org.junit.Assert.assertTrue;

import java.io.IOException;
import java.nio.charset.UnmappableCharacterException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import org.junit.Before;
import org.junit.Test;
public class SampleTest {
    Sample sample;

    @Before
    public void setUp() throws Exception {
        sample = new Sample();
    }
    @Test
    public void testWriteNIO() {
        sample.writeNIO();
        Path path = Paths.get("/Users", "tomo", "NIO.txt");
        boolean exists = Files.exists(path);
        assertTrue(exists);
    }

    @Test(expected = UnmappableCharacterException.class)
    public void testWriteNIO2() throws IOException {
        sample.writeNIO2();
    }

}

The file NIO.txt is Pock?mon.
When you refactor from NIO to NIO2 , you will have UnmappableCharacterException.