德比表示安装选择， 所以我做了：
thufir@dur:~$
thufir@dur:~$ ll /opt/db-derby-10.9.1.0-bin/lib/derbytools.jar
-rw-r--r-- 1 root root 174932 May 31 12:19 /opt/db-derby-10.9.1.0-bin/lib/derbytools.jar
thufir@dur:~$
thufir@dur:~$ ll /opt/db-derby-10.9.1.0-bin/bin/ij
-rwxr-xr-x 1 root root 5876 May 31 12:18 /opt/db-derby-10.9.1.0-bin/bin/ij*
thufir@dur:~$
现在，我应该为 /etc/environment 设置什么值？
thufir@dur:~$
thufir@dur:~$ cat /etc/environment
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
JAVA_HOME="/usr/lib/jvm/java-6-openjdk-i386/jre/"
我该如何调用环境变量 DERBY_INSTALL？它应该有什么值？
我只是想使用 ij 工具。
以下是我目前所掌握的信息：
root@dur:/opt/db-derby-10.9.1.0-bin/bin#
root@dur:/opt/db-derby-10.9.1.0-bin/bin# source /etc/environment
root@dur:/opt/db-derby-10.9.1.0-bin/bin#
root@dur:/opt/db-derby-10.9.1.0-bin/bin# echo $DERBY_INSTALL
/opt/db-derby-10.9.1.0-bin/lib/
root@dur:/opt/db-derby-10.9.1.0-bin/bin# echo $DERBY_HOME
/opt/db-derby-10.9.1.0-bin/
root@dur:/opt/db-derby-10.9.1.0-bin/bin#
root@dur:/opt/db-derby-10.9.1.0-bin/bin# . setEmbeddedCP
root@dur:/opt/db-derby-10.9.1.0-bin/bin#
root@dur:/opt/db-derby-10.9.1.0-bin/bin# java org.apache.derby.tools.sysinfo
------------------ Java Information ------------------
Java Version: 1.6.0_24
Java Vendor: Sun Microsystems Inc.
Java home: /usr/lib/jvm/java-6-openjdk-i386/jre
Java classpath: /opt/db-derby-10.9.1.0-bin//lib/derby.jar:/opt/db-derby-10.9.1.0-bin//lib/derbytools.jar:
OS name: Linux
OS architecture: i386
OS version: 3.2.0-23-generic
Java user name: root
Java user home: /root
Java user dir: /opt/db-derby-10.9.1.0-bin/bin
java.specification.name: Java Platform API Specification
java.specification.version: 1.6
java.runtime.version: 1.6.0_24-b24
--------- Derby Information --------
[/opt/db-derby-10.9.1.0-bin/lib/derby.jar] 10.9.1.0 - (1344872)
[/opt/db-derby-10.9.1.0-bin/lib/derbytools.jar] 10.9.1.0 - (1344872)
------------------------------------------------------
----------------- Locale Information -----------------
Current Locale : [English/United States [en_US]]
Found support for locale: [cs]
version: 10.9.1.0 - (1344872)
Found support for locale: [de_DE]
version: 10.9.1.0 - (1344872)
Found support for locale: [es]
version: 10.9.1.0 - (1344872)
Found support for locale: [fr]
version: 10.9.1.0 - (1344872)
Found support for locale: [hu]
version: 10.9.1.0 - (1344872)
Found support for locale: [it]
version: 10.9.1.0 - (1344872)
Found support for locale: [ja_JP]
version: 10.9.1.0 - (1344872)
Found support for locale: [ko_KR]
version: 10.9.1.0 - (1344872)
Found support for locale: [pl]
version: 10.9.1.0 - (1344872)
Found support for locale: [pt_BR]
version: 10.9.1.0 - (1344872)
Found support for locale: [ru]
version: 10.9.1.0 - (1344872)
Found support for locale: [zh_CN]
version: 10.9.1.0 - (1344872)
Found support for locale: [zh_TW]
version: 10.9.1.0 - (1344872)
------------------------------------------------------
root@dur:/opt/db-derby-10.9.1.0-bin/bin#
好的，也许它可以起作用：
root@dur:/opt/db-derby-10.9.1.0-bin/bin#
root@dur:/opt/db-derby-10.9.1.0-bin/bin# echo $CLASSPATH
/opt/db-derby-10.9.1.0-bin//lib/derby.jar:/opt/db-derby-10.9.1.0-bin//lib/derbytools.jar:
root@dur:/opt/db-derby-10.9.1.0-bin/bin#
root@dur:/opt/db-derby-10.9.1.0-bin/bin# java org.apache.derby.tools.ij
ij version 10.9
ij> quit
> ;
root@dur:/opt/db-derby-10.9.1.0-bin/bin#
虽然它确实可以在同一个控制台上运行：
root@dur:/opt/db-derby-10.9.1.0-bin/bin#
root@dur:/opt/db-derby-10.9.1.0-bin/bin# cd /root/apache-james-3.0-beta4/var/store/derby/
root@dur:~/apache-james-3.0-beta4/var/store/derby#
root@dur:~/apache-james-3.0-beta4/var/store/derby# java org.apache.derby.tools.ijij version 10.9
ij> quit
> ;
root@dur:~/apache-james-3.0-beta4/var/store/derby#
我在另一个控制台中收到错误：
root@dur:~/apache-james-3.0-beta4/var/store/derby#
root@dur:~/apache-james-3.0-beta4/var/store/derby# java org.apache.derby.tools.ij
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/derby/tools/ij
Caused by: java.lang.ClassNotFoundException: org.apache.derby.tools.ij
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: org.apache.derby.tools.ij. Program will exit.
root@dur:~/apache-james-3.0-beta4/var/store/derby#
为什么另一个控制台不工作？
答案1
唯一合理的解释是你没有在第二个控制台中初始化类路径！
我想它在这里完成：
root@dur:/opt/db-derby-10.9.1.0-bin/bin# . setEmbeddedCP
手动：
CLASSPATH=/opt/db-derby-10.9.1.0-bin/lib/derby.jar:/opt/db-derby-10.9.1.0-bin/lib/derbytools.jar
java org.apache.derby.tools.ij