java - 我在 Mac 上安装的 Java 11 中的 derby.jar 文件在哪里？

Question

我刚刚读了here ，Java DB(分别是 Derby)随 JDK 一起提供。

我的 Mac 上安装的 Java 中的 derby.jar 在哪里？

终端命令

/usr/libexec/java_home

打印

/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 jmods
drwxr-xr-x  72 root  wheel   2,3K  6 Okt 14:29 legal
drwxr-xr-x  57 root  wheel   1,8K  6 Okt 14:29 lib
-rw-r--r--   1 root  wheel   1,2K  6 Okt 14:29 release

我能在主文件夹中找到的唯一 jar 文件如下:

find . -name '*.jar'
./lib/jrt-fs.jar

感谢您的帮助!

附言:

java -version

打印

java version "11.0.1" 2018-10-16 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.1+13-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.1+13-LTS, mixed mode)

Answer 1

从 JDK 9 开始，Derby 是 no longer included在 JDK 中。来自migration guide :

JavaDB, which was a rebranding of Apache Derby, isn’t included in JDK 9.

JavaDB was bundled with JDK 7 and JDK 8. It was found in the db directory of the JDK installation directory.

You can download and install Apache Derby from Apache Derby Downloads.