How to Install JAVA 7 (JDK 7u79) on CentOS/RHEL 7/6/5 and Fedora

How to Install JAVA 7 (JDK 7u79) on CentOS/RHEL 7/6/5 and Fedora

 

For 64 Bit:-

# cd /opt/
# wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; 

oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.tar.gz"

# tar xzf jdk-7u79-linux-x64.tar.gz

For 32 Bit:-

# cd /opt/
# wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; 

oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-i586.tar.gz"

# tar xzf jdk-7u79-linux-i586.tar.gz 

Install Java with Alternatives

After extracting Java archive file, we just need to set up to use newer version of Java using alternatives. Use the following commands to do it.

# cd /opt/jdk1.7.0_79/
# alternatives --install /usr/bin/java java /opt/jdk1.7.0_79/bin/java 2
# alternatives --config java There are 3 programs which provide 'java'.

 Selection Command ----------------------------------------------- *
1 /opt/jdk1.7.0_60/bin/java + 2 /opt/jdk1.7.0_72/bin/java 3 /opt/jdk1.7.0_79/bin/java

 Enter to keep the current selection[+], or type selection number: 3 [Press Enter]

Now you may also required to set up javac and jar commands path using alternatives command.

# alternatives --install /usr/bin/jar jar /opt/jdk1.7.0_79/bin/jar 2
# alternatives --install /usr/bin/javac javac /opt/jdk1.7.0_79/bin/javac 2
# alternatives --set jar /opt/jdk1.7.0_79/bin/jar
# alternatives --set javac /opt/jdk1.7.0_79/bin/javac

Check Installed Java Version

Use following command to check which version of Java is currently being used by system.

# java -version java version "1.7.0_79" Java(TM) SE Runtime Environment (build 1.7.0_79-b15)

Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)

Configuring Environment Variables

Most of Java based application’s uses environment variables to work. Use following commands to set up these variable properly.
It’s also good to add following commands to any start-up script like ~/.bashrc or ~/.bash_profile.

• Setup JAVA_HOME Variable 

# export JAVA_HOME=/opt/jdk1.7.0_79

• Setup JRE_HOME Variable
• 
  

# export JRE_HOME=/opt/jdk1.7.0_79/jre

• Setup PATH Variable
• 
  

# export PATH=$PATH:/opt/jdk1.7.0_79/bin:/opt/jdk1.7.0_79/jre/bin