deb http://deb.debian.org/debian bookworm main
deb-src http://deb.debian.org/debian bookworm main

deb http://deb.debian.org/debian-security/ bookworm-security main
deb-src http://deb.debian.org/debian-security/ bookworm-security main

deb http://deb.debian.org/debian bookworm-updates main
deb-src http://deb.debian.org/debian bookworm-updates main

@Column(nullable=false) 是生成模式的指令。从该类生成的数据库列将在实际数据库中标记为不可空。

optional=false 是一条运行时指令。它的主要功能与懒加载有关。除非你记得设置 optional=false,否则你就无法懒加载一个非集合映射实体(因为 Hibernate 不知道那里应该有一个代理还是一个空值,除非你告诉它空值是不可能的,所以它可以生成一个代理)。

https://stackoverflow.com/questions/3331907/what-is-the-difference-between-manytooneoptional-false-vs-columnnullable-f

1.Get the User in a Bean

The simplest way to retrieve the currently authenticated principal is via a static call to the SecurityContextHolder:

Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
String currentPrincipalName = authentication.getName();

An improvement to this snippet is first checking if there is an authenticated user before trying to access it:

Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
if (!(authentication instanceof AnonymousAuthenticationToken)) {
    String currentUserName = authentication.getName();
    return currentUserName;
}

- 阅读剩余部分 -

Since the colors worked fine while being loggged in directly, I just un-uncommented the line force_color_prompt=yes in the file ~/.bashrc, that gave me colors over ssh, too:

# uncomment for a colored prompt, if the terminal has the capability; turned
# off by default to not distract the user: the focus in a terminal window
# should be on the output of commands, not on the prompt
force_color_prompt=yes

(Ubuntu 18.04 LTS)

https://askubuntu.com/questions/16336/how-to-get-coloured-terminal-over-ssh