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
Starting with Java 8, we have a new Date API: java.time.
However, sometimes we still need to perform conversions between the new and old APIs, and work with date representations from both.
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;
}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