Installing Java under CentOS 7

First step: Check if the Linux-brought JDK is installed

The installed CentOS will bring openjdk, with the command java-version, will have the following information:

Java Version "1.6.0"
OpenJDK Runtime Environment (build 1.6.0-b09)
OpenJDK 64-bit Server VM (build 1.6.0-b09, Mixed mode)

It is best to uninstall the OPENJDK before installing Sun's JDK.

See Rpm-qa First | grep java

If it is

The following information is displayed:

java-1.4.2-gcj-compat-1.4.2.0-40jpp.115
Java-1.6.0-openjdk-1.6.0.0-1.7.b09.el5

Unloading:

RPM-E--nodeps java-1.4.2-gcj-compat-1.4.2.0-40jpp.115
RPM-E--nodeps Java-1.6.0-openjdk-1.6.0.0-1.7.b09.el5

If OpenJDK source cannot be found, you can also uninstall this

Yum-y Remove Java java-1.4.2-gcj-compat-1.4.2.0-40jpp.115
Yum-y Remove Java Java-1.6.0-openjdk-1.6.0.0-1.7.b09.el5

Step two, install Sun's JDK

1. Download the compressed package

2. Create new application directory (put the software you need in this directory to facilitate the same management) for example: Usersoft

mkdir/

3. Copy the downloaded files to the/usersoft directory

4, then configure the environment variable enter the following command to enter the configuration file.

[Email protected] java]# Vi/etc/profile
Include in the file

Export PATH USER LOGNAME MAIL HOSTNAME histsize Histcontrol
Export java_home=/usersoft/java/jdk1.7.0_60
Export path= $JAVA _home/bin: $PATH
Export classpath=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar

5. Let the environment variable take effect.execute the configuration file so that it takes effect immediately and enter the following command:

[Email protected] java]# Source/etc/profile

View the current version of Java installation
[Email protected] java]# java-version

End!

Installing Java under CentOS 7