java 8 lambda toMap显示类型转换错误

我在尝试使用lambda表达式java 8收集要映射的对象列表时遇到类型转换错误

代码如下：

public static void main(String[] args){
List<Player> players = Arrays.asList(
        new Player("Liz", Gender.FEMALE, 20),
        new Player("Liz", Gender.FEMALE, 22),
        new Player("Bob", Gender.MALE, 20)          
        );

System.out.println(
        players.stream()
                 .collect(toMap(
                         player -> player.getName()+"_"+player.getAge(), 
// above line giving error. 
//The method getAge() is undefined for the type Object
//- The method getName() is undefined for the type Object                                
                         player -> player))
        );

}

玩家等级如下：

class Player {

private String name;
private Integer age;
private Gender gender;

public Player(String name, Gender gender, Integer age){
    this.name = name;
    this.gender = gender;
    this.age = age;
}
// ...... with corresponding getters and setters    
}

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这在某些版本中是一个问题（我想说1.8.0_45，但我不能确认）。我刚刚在1.8.0_71上试用了你的代码，它对我很有用

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最新版本是1.8.0_111，因此您应该尝试升级到该版本。

在JDK 1.8.0＠上运行良好感谢您的输入。是的，它在1.8.0_111的命令提示符下工作。eclipse仍然显示错误，需要检查eclipse设置。

class Player {

private String name;
private Integer age;
private Gender gender;

public Player(String name, Gender gender, Integer age){
    this.name = name;
    this.gender = gender;
    this.age = age;
}
// ...... with corresponding getters and setters    
}