Sun/Oracle的Java JDK 7可能与OpenJDK的不兼容，在Fedora 15中可以使用包管理器安装。具体如何安装呢？打开终端，，使用下面的命令安装：
For 64-bit
For 32-bit
If you already have OpenJDK/OpenJRE installed, you will need to configure your system so that the applications use the Sun/Oracle Java version instead of OpenJDK/OpenJRE. Here is how to do it:
su -c ‘alternatives –install /usr/bin/java java /usr/java/jdk1.7.0/jre/bin/java 20000’su -c ‘alternatives –install /usr/bin/javaws javaws /usr/java/jdk1.7.0/jre/bin/javaws 20000’su -c ‘alternatives –install /usr/bin/javac javac /usr/java/jdk1.7.0/bin/javac 20000’su -c ‘alternatives –install /usr/bin/jar jar /usr/java/jdk1.7.0/bin/jar 20000’
For 64-bit:
For 32-bit:
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