Installing Java SDK 7

Perform the following steps to install the Java SDK 7 on your machine. You can also go with JDK 1.8:

1. Download the Java SDK 7 RPM from Oracle's site (http://www.oracle.com/technetwork/java/javase/downloads/index.html).
2. Install the Java jdk-7u<version>-linux-x64.rpm file on your CentOS machine using the following command:

sudo rpm -ivh jdk-7u<version>-linux-x64.rpm 

1. Add the following environment variable in the ~/.bashrc file:

export JAVA_HOME=/usr/java/jdk<version>

1. Add the path of the bin directory of the JDK to the PATH system environment variable to the ~/.bashrc file:

export PATH=$JAVA_HOME/bin:$PATH 

1. Run the following command to reload the bashrc file on the current login terminal:

source ~/.bashrc

1. Check the Java installation as follows:

java -version  

The output of the preceding command is as follows:

java version "1.7.0_71"
Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)