如何让ORACLE JAVA SE 7工作？
我是Ubuntu的新手，所以请体谅。
我最近手动下载并安装了（Java SE 7ux）JavaSE 1.7.0_51。 Linux x64（适用于64位系统）“tar.gz”包。 我的Ubuntu版本是13.10（OS 64位）
我仔细按照以下说明操作： 如何在Ubuntu上安装JDK 7
为了validation安装是否成功，我写道：
javac -version 并得到以下结果：
Error occurred during initialization of VM java/lang/NoClassDefFoundError: java/lang/Object $ which java gives the below results: /usr/bin/java $ which javac also gives the below results: /usr/bin/javac
我重复了几次这些步骤，以防我错过了一个重要的步骤，但仍然得到了相同的结果。 经过几次在线研究后我发现@ Reference ，我实际上可以通过PPA存储库在Ubuntu上安装Java。
安装完毕后我
$ java -version
我还是得到：
Error occurred during initialization of VM java/lang/NoClassDefFoundError: java/lang/Object
但是当我
$ cd /usr/bin $ ls -ld java*
我明白了：
lrwxrwxrwx 1 root root 22 Feb 19 19:06 java -> /etc/alternatives/java lrwxrwxrwx 1 root root 23 Feb 17 02:15 javac -> /etc/alternatives/javac lrwxrwxrwx 1 root root 25 Feb 19 20:09 javadoc -> /etc/alternatives/javadoc lrwxrwxrwx 1 root root 32 Feb 19 20:09 javafxpackager -> /etc/alternatives/javafxpackager lrwxrwxrwx 1 root root 23 Feb 19 20:09 javah -> /etc/alternatives/javah lrwxrwxrwx 1 root root 23 Feb 19 20:09 javap -> /etc/alternatives/javap lrwxrwxrwx 1 root root 25 Feb 19 20:09 java_vm -> /etc/alternatives/java_vm lrwxrwxrwx 1 root root 24 Feb 17 02:15 javaws -> /etc/alternatives/javaws
也类似于：
$ cd /etc/alternatives $ ls -ld java* lrwxrwxrwx 1 root root 36 Feb 19 19:15 java -> /usr/local/java/jdk1.7.0_51/bin/java lrwxrwxrwx 1 root root 37 Feb 17 02:15 javac -> /usr/local/java/jdk1.7.0_51/bin/javac lrwxrwxrwx 1 root root 38 Feb 19 20:09 javadoc -> /usr/lib/jvm/java-7-oracle/bin/javadoc lrwxrwxrwx 1 root root 48 Feb 19 20:09 javadoc.1.gz -> /usr/lib/jvm/java-7-oracle/man/man1/javadoc.1.gz lrwxrwxrwx 1 root root 45 Feb 19 20:09 javafxpackager -> /usr/lib/jvm/java-7-oracle/bin/javafxpackager lrwxrwxrwx 1 root root 55 Feb 19 20:09 javafxpackager.1.gz -> /usr/lib/jvm/java-7-oracle/man/man1/javafxpackager.1.gz lrwxrwxrwx 1 root root 36 Feb 19 20:09 javah -> /usr/lib/jvm/java-7-oracle/bin/javah lrwxrwxrwx 1 root root 46 Feb 19 20:09 javah.1.gz -> /usr/lib/jvm/java-7-oracle/man/man1/javah.1.gz lrwxrwxrwx 1 root root 36 Feb 19 20:09 javap -> /usr/lib/jvm/java-7-oracle/bin/javap lrwxrwxrwx 1 root root 46 Feb 19 20:09 javap.1.gz -> /usr/lib/jvm/java-7-oracle/man/man1/javap.1.gz lrwxrwxrwx 1 root root 42 Feb 19 20:09 java_vm -> /usr/lib/jvm/java-7-oracle/jre/bin/java_vm lrwxrwxrwx 1 root root 42 Feb 17 02:15 javaws -> /usr/local/java/jdk1.7.0_51/jre/bin/javaws
注意
javadoc.1.gz -> /usr/lib/jvm/java-7-oracle/man/man1/javadoc.1.gz javafxpackager.1.gz -> /usr/lib/jvm/java-7-oracle/man/man1/javafxpackager.1.gz javah.1.gz -> /usr/lib/jvm/java-7-oracle/man/man1/javah.1.gz javah.1.gz -> /usr/lib/jvm/java-7-oracle/man/man1/javah.1.gz
……都是红色的
- 这些意味着什么，最重要的是我如何使我的Java安装工作？
期待您的帮助！
从其官方网站下载Oracle Java
从官方网站下载Java
手动安装JDK 1.7
#java -version #sudo mkdir -p /usr/lib/jvm #sudo mv jdk-7u21-linux-i586.tar.gz /usr/lib/jvm #cd /usr/lib/jvm #sudo tar zxvf jdk-7u21-linux-i586.tar.gz #sudo rm jdk-7u21-linux-i586.tar.gz #ls -l #jdk1.7.0_21 #sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.7.0_21/bin/javac" 1 #sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.7.0_21/bin/java" 1 #sudo update-alternatives --set "javac" "/usr/lib/jvm/jdk1.7.0_21/bin/javac" #sudo update-alternatives --set "java" "/usr/lib/jvm/jdk1.7.0_21/bin/java" #sudo vi /etc/profile Add the following entries to the bottom of your /etc/profile file: #JAVA_HOME=/usr/lib/jvm/jdk1.7.0_21 PATH=$PATH:$JAVA_HOME/bin export JAVA_HOME export PATH #. /etc/profile #java -version
替换jdk1.7.0_21使用已下载的版本