Fedora 21 Configuration JDK environment Replacement OPENJDK

1. View Fedora's existing Java environment version

OPENJDK version "1.8.0_25" OPENJDK Runtime Environment (build 1.8.0_25-b18) openjdk 64-bit Server VM (build 25.25-b02, mixed Mode

2. Download Sun's latest jdk RPM version

A.: http://www.oracle.com/technetwork/java/javase/downloads/index.html

The latest version I downloaded here is jdk-8u25-linux-x64.rpm [Fedora 64-bit system, please select the version for your system]

B. Installation:

Rpm-iv jdk-8u25-linux-x64.rpm

　　Error: XXX appears xxx is not in the sudoers file, this matter will be reported

Solve:

Visudo

#visudo can modify the edit/etc/sudoers to join with the following own user xxx sudo to perform the appropriate permissions

XXX all= (All) all

Re-RPM-IV jdk-8u25-linux-x64.rpm successfully installed!

3. Configure Java Environment variables

vim  /etc/profile # 添加以下内容 　　JAVA_HOME= /usr/local/java 　　PATH=$JAVA_HOME /bin :$PATH 　　CLASSPATH=.:$JAVA_HOME /lib/dt .jar:$JAVA_HOME /lib/tools .jar 　　export JAVA_HOME 　　export PATH 　　export CLASSPATH # 退出编辑模式，回到命令行，运行 source /etc/profile#再次运行java-version View information Display java-version# show Java version "1.8.0_25"
Java (TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot (TM) 64-bit Server VM (build 25.25-b02, Mixed mode) #还没完, don't know why every time I open a new terminal and then go back and then configure the default javasudo/usr/s directly Bin/alternatives--config Java
[sudo] password for QKL:

There are a total of 2 programs that provide "Java".

Options command
-----------------------------------------------
* 1/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.25-4.b18.fc21.x86_64/jre/bin/java
+ 2/usr/java/jdk1.8.0_25/bin/java

Press Enter to leave the current option [+], or type the option number:
#根据我这边的显示新安装的java JDK above Enter number 2 OK

　　

Fedora 21 Configuration JDK environment Replacement OPENJDK