It is difficult to switch jdk version on OS X environment which contains several jdk versions. Because, the relation among symbolic links is quite complex.
This program simply switches jdk versions.
This program shows available jdks with no command line arguments, and prints currently used jdk. The printed jdks are the available jdks.
$ cd /Library/Java/JavaVirtualMachines
$ ls -F
1.7@ 1.7.0_45@ 1.8.0@ jdk1.7.0_45.jdk/
1.7.0@ 1.8@ 1.8.0_20@ jdk1.8.0_20.jdk/
$ chjdkver
1.7 (*)
1.7.0
1.7.0_45
1.8
1.8.0
1.8.0_20
This program changes jdk version to command line argument. If unavailable version is specified, this program shows error message and quit.
$ java -version
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)
$ chjdkver
1.7 (*)
1.7.0
1.7.0_10
1.7.0_45
1.8
1.8.0
1.8.0_20
$ sudo chjdkver 1.8
$ java -version
java version "1.8.0_20-ea"
Java(TM) SE Runtime Environment (build 1.8.0_20-ea-b05)
Java HotSpot(TM) 64-Bit Server VM (build 25.20-b05, mixed mode)
$ chjdkver
1.7
1.7.0
1.7.0_10
1.7.0_45
1.8 (*)
1.8.0
1.8.0_20
This program supports initialization of environment and available jdks. Initialization sequence runs with certain options, as follows.
$ sudo chjdkver --init
Above command performs initialization sequence for environment and installed jdks. When this initialization sequence is done, following two initialization sequence is performed.
Note that,
/System/Library/Frameworks/JavaVM.framework/Versions/A/Commands must
be linked to ../CurrentJDK/Contents/Home/bin. Because
/usr/bin/java and etc. are symblic linked to
/System/Library/Frameworks/JavaVM.framework/Versions/A/Commands/java,
and the A directory is not symbolic link.
$ sudo chjdkver --init_env
Above command shows the following commands.
$ cd /System/Library/Frameworks/JavaVM.framework/Versions/A
$ sudo mv Commands Commands.back
$ sudo ln -s ../CurrentJDK/Contents/Home/bin ./Commands
Oracle JDKs are installed into /Library/Java/JavaVirtualMachines.
This program shows only files whose name is contained numbers, dot(.),
hyphen, and underbar. Therefore, this initialization sequence
symbolik link to certain name.
$ ls -F
jdk1.7.0_10.jdk/ jdk1.7.0_45.jdk/ jdk1.8.0_20.jdk/
$ chjdkver
$ sudo chjdkver --init_jdks
1.7@ 1.7.0_10@ 1.8@ 1.8.0_20@ jdk1.7.0_45.jdk/
1.7.0@ 1.7.0_45@ 1.8.0@ jdk1.7.0_10.jdk/ jdk1.8.0_20.jdk/
$ chjdkver
1.7 (*)
1.7.0
1.7.0_10
1.7.0_45
1.8
1.8.0
1.8.0_20
- ????
- Author: Haruaki Tamada
- Web page: http://github.com/tamada/chjdkver
Apache License Version 2.0
Copyright 2013- Haruaki Tamada
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
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