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題外話- 在Mac OS X 上面切換不同 Java 版本

因為最近同時要看好多不同的版本的JBoss BPMS, EAP, Fuse 等等... 發現就會碰到Java SE 7 的BUG,等不及Orcale 修復了,所以不得不切回 Java SE 6, 但是有時,又需要切回 Java SE 7 去測試校能等等..

我那個在Ubuntu 工作有強力系統潔癖的工程師老公,看到我切來切去,就回我一句,你不會弄好幾個VM 然後裝我們家的Ubuntu 分不同的VM去測就好了喔~ 這樣你的OS 才不會一團亂啊...!
但是,這不是VM 的問題啊~ 我喜歡在Mac 的環境下工作咩,不然我花大錢買Mac 是幹嘛?錢多喔!! 所以,他的建議馬上就被我丟到垃圾桶去了。

這裡註記一下怎麼切換,所以我下次才不會忘記。我不知道這是不是最正確的做法拉,可以提供參考。

要知道現在的電腦裡有哪些版本的Java 請打

/usr/libexec/java_home -V




如果你想用某幾個版本的Java SE, 不用我教你吧,請自己去Oracle 的官網上下載。下載安裝之後,如果你以為這樣就結束了,那就不用有這篇了吧~

所以,要看目前的Runtime 請直接打 (這應該大家都會吧 ... )
java -version

他就會顯示目前你的default Java 執行環境。
要把default 的java 連結改過去,
先到 /usr/bin 下面,看一下java 的連結在哪裡,

cd /usr/bin/
ls -ln java







發現還是在舊的,所以請砍掉這兩個連結,

sudo rm -f java
sudo rm -f javac

直接連結到剛剛安裝的Java SE 版本路徑下
sudo ln -s /Library/Java/JavaVirtualMachines/jdk1.x.x_x.jdk/Contents/Home/bin/java java
sudo ln -s /Library/Java/JavaVirtualMachines/jdk1.x.x_x.jdk/Contents/Home/bin/javac javac



這樣再去執行
java -version 就會發現已經改好了。


還沒完~如果你跟我一樣有設定JAVA_HOME的話,記得去把位置改一下

vi ~/.bash_profile 

裡面把JAVA_HOME的位置改掉就好囉!

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.x.x_xx.jdk/Contents/Home


然後打
source ~/.bash_profile  讓它生效。




切回 1.6 的參數如下:

ln -s /Library/Java/Home/bin/java java
ln -s /Library/Java/Home/bin/javac javac

export JAVA_HOME=/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Home

以上。跟JBoss 沒啥關係的題外話。

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