我刚刚在这里读到Java DB（分别是 Derby）是随 JDK 一起提供的。
哪里是derby.jar我的Mac上的Java安装内？
终端命令
/usr/libexec/java_home
印刷
/Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home
和
ls -halt /Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home
drwxr-xr-x 10 root wheel 320B 6 Okt 14:29 .
drwxr-xr-x 5 root wheel 160B 6 Okt 14:29 ..
-r--r--r-- 1 root wheel 160B 6 Okt 14:29 README.html
drwxr-xr-x 34 root wheel 1,1K 6 Okt 14:29 bin
drwxr-xr-x 7 root wheel 224B 6 Okt 14:29 conf
drwxr-xr-x 9 root wheel 288B 6 Okt 14:29 include
drwxr-xr-x 72 root wheel 2,3K 6 Okt 14:29 …