实现了Serializable接口的内部类依然报NotSerializableException错

把实现Serializable的内部类提取到外部即可

补充

一个栗子：

1. 原始代码

public class House implements Serializable {
    private String address;
    private String area;
    ...
    
    public class Room implements Serializable {
        private String area;
        private String owner;
        
        ...
    }
}

2. 提取内部类到外部

public class House implements Serializable {
    private String address;
    private String area;
    ...
}

public class Room implements Serializable {
    private String area;
    private String owner;
    
    ...
}