更新OSX的Java版本

Jacendfeng 發(fā)布于2019-08-14 12:07 / 1052人閱讀

摘要：中自帶的版本過低目前僅為現(xiàn)在很多應(yīng)用要求版本為所以必須要升級本文章基于版本步驟到官網(wǎng)上下載最新的安裝下載好的到目錄下查看安裝的假設(shè)最新安裝的為更改的軟連接在中系列的命令都只是軟連接連接到目錄下的命令而是

OSX中自帶的Java版本過低, 目前僅為1.6. 現(xiàn)在很多Java應(yīng)用要求版本為1.7+, 所以必須要升級java.

本文章基于OSX版本: Yosemite 10.10.2

步驟:

到Oracle官網(wǎng)上下載最新的OSX JDK.

安裝下載好的JDK

到 /Library/Java/JavaVirtualMachines/ 目錄下查看安裝的 JDK. 假設(shè)最新安裝的 JDK 為 jdk1.8.0_20.jdk.

更改 CurrentJDK 的軟連接. sudo ln -s /Library/Java/JavaVirtualMachines/jdk1.8.0_20.jdk/Contents /System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK

在OS X中, /usr/bin/java* 系列的命令都只是軟連接, 連接到 /System/Library/Frameworks/JavaVM.framework/Versions/Current 目錄下的java命令:

$ ll /usr/bin/java*
lrwxr-xr-x  1 root  wheel    74B  3 26 09:37 /usr/bin/java -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java
lrwxr-xr-x  1 root  wheel    75B  3 26 09:37 /usr/bin/javac -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/javac
lrwxr-xr-x  1 root  wheel    77B  3 26 09:37 /usr/bin/javadoc -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/javadoc
lrwxr-xr-x  1 root  wheel    75B  3 26 09:37 /usr/bin/javah -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/javah
lrwxr-xr-x  1 root  wheel    75B  3 26 09:37 /usr/bin/javap -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/javap
lrwxr-xr-x  1 root  wheel    76B  3 26 09:37 /usr/bin/javaws -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/javaws

而 /System/Library/Frameworks/JavaVM.framework/Versions/Current 是 /System/Library/Frameworks/JavaVM.framework/Versions/A 的軟連接:

$ ll /System/Library/Frameworks/JavaVM.framework/Versions/Current
lrwxr-xr-x  1 root  wheel     1B  3 26 09:37 /System/Library/Frameworks/JavaVM.framework/Versions/Current -> A

JDK 的安裝過程中, 會替換 /System/Library/Frameworks/JavaVM.framework/Versions/A 目錄下的文件.

/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK 也是一個軟連接, 連接到當(dāng)前的JDK.

$ ll /System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK
lrwxr-xr-x  1 root  wheel    58B  3 27 14:20 /System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK -> /Library/Java/JavaVirtualMachines/jdk1.8.0_20.jdk/Contents