public static class TestKeyComplex {
    private String name;
    private Integer rowNum;
    private int teszt;
    private List<String> strings;


    public TestKeyComplex(String value) {
        strings = new ArrayList<>();
        strings.add("Hello");
    }

    public TestKeyComplex() {
        strings = new ArrayList<>();
        strings.add("Hello");
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getRowNum() {
        return rowNum;
    }

    public void setRowNum(Integer rowNum) {
        this.rowNum = rowNum;
    }

    public int getTeszt() {
        return teszt;
    }

    public void setTeszt(int teszt) {
        this.teszt = teszt;
    }

    public List<String> getStrings() {
        return strings;
    }

    public void setStrings(List<String> strings) {
        this.strings = strings;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        TestKeyComplex that = (TestKeyComplex) o;
        return teszt == that.teszt &&
                Objects.equals(name, that.name) &&
                Objects.equals(rowNum, that.rowNum) &&
                Objects.equals(strings, that.strings);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, rowNum, teszt, strings);
    }
}

public static class TestValue {
    private String name;
    private Integer rowNum;
    private Date date;
    private EmbeddedTestClass embeddedTestClass;

    public TestValue() {
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getRowNum() {
        return rowNum;
    }

    public void setRowNum(Integer rowNum) {
        this.rowNum = rowNum;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

    public EmbeddedTestClass getEmbeddedTestClass() {
        return embeddedTestClass;
    }

    public void setEmbeddedTestClass(EmbeddedTestClass embeddedTestClass) {
        this.embeddedTestClass = embeddedTestClass;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        TestValue testValue = (TestValue) o;
        return Objects.equals(name, testValue.name) &&
                Objects.equals(rowNum, testValue.rowNum) &&
                Objects.equals(date, testValue.date) &&
                Objects.equals(embeddedTestClass, testValue.embeddedTestClass);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, rowNum, date, embeddedTestClass);
    }
}


@Test
public void dummyDataSimpleComplexKeyInsert() {
    MongoDatabase db = mongoClient.getDatabase("TODO");
    MongoCollection mongoCollection = db.getCollection("TODO");

   /*
     set codec and other stuff
   */

    //fill object with data..
    // TODO   - MongoTestDataComplexKey -> contains key and value
    MongoTestDataComplexKey data = new MongoTestDataComplexKey(dummyKeyComplex, dummyValue);

    // Insert
    typedCollection.insertOne(data);
    assertEquals(1, typedCollection.find().into(new ArrayList<>()).size());

    // Find   
    MongoTestDataComplexKey res = typedCollection.find(eq("_id", dummyKey)).first();
    assertNotNull(res); // ------>>>> fails with null! 
    assertEquals(dummyValue, res.getValue());

    // Delete
    typedCollection.deleteOne(eq("_id", dummyKey));
    assertEquals(0, typedCollection.find().into(new ArrayList<>()).size());
}