Download the required JAVA JDK package for the system I was working on. It was a 32 bit CentOS 6 so I needed to get the 32 bit JAVA JDK package from Oracle’s JAVA download page
Note that I needed to install an older version of JAVA JDK since it was specific to the software I was setting up.
Download JAVA JDK6 here
Download JAVA JDK7 or JDK8 here
You may also wget Oracle JDK 8, JDK 7 or JDK 6 using command line as in.
JAVA JDK 8
for 64bit (x86_64) system
wget --no-cookies \
--no-check-certificate \
--header "Cookie: oraclelicense=accept-securebackup-cookie" \
"http://download.oracle.com/otn-pub/java/jdk/8-b132/jdk-8-linux-x64.rpm" \
-O /opt/jdk-8-linux-x64.rpm
for 32bit (x86) system
wget --no-cookies \
--no-check-certificate \
--header "Cookie: oraclelicense=accept-securebackup-cookie" \
"http://download.oracle.com/otn-pub/java/jdk/8-b132/jdk-8-linux-i586.rpm" \
-O /opt/jdk-8-linux-i586.rpm
JAVA JDK 7
for 64bit (x86_64) system
wget --no-cookies \
--no-check-certificate \
--header "Cookie: oraclelicense=accept-securebackup-cookie" \
"http://download.oracle.com/otn-pub/java/jdk/7u51-b13/jdk-7u51-linux-x64.rpm" \
-O /opt/jdk-7-linux-x64.rpm
for 32bit (x86) system
wget --no-cookies \
--no-check-certificate \
--header "Cookie: oraclelicense=accept-securebackup-cookie" \
"http://download.oracle.com/otn-pub/java/jdk/7u51-b13/jdk-7u51-linux-i586.rpm" \
-O /opt/jdk-7-linux-i586.rpm
JAVA JDK 6
for 64bit (x86_64) system
wget --no-cookies \
--no-check-certificate \
--header "Cookie: oraclelicense=accept-securebackup-cookie" \
"http://download.oracle.com/otn/java/jdk/6u45-b06/jdk-6u45-linux-x64-rpm.bin" \
-O /opt/jdk-6u45-linux-x64-rpm.bin
for 32bit (x86) system
wget --no-cookies \
--no-check-certificate \
--header "Cookie: oraclelicense=accept-securebackup-cookie" \
"http://download.oracle.com/otn/java/jdk/6u45-b06/jdk-6u45-linux-i586-rpm.bin" \
-O /opt/jdk-6u45-linux-i586-rpm.bin
1. Once the JAVA JDK package got downloaded I proceeded with installing the package.
a) Installing the JAVA JDK6 package in CentOS 6
for 32bit (x86) system
chmod +x /opt/jdk-6u45-linux-i586-rpm.bin
/opt/./jdk-6u45-linux-i586-rpm.bin
for 64bit (x86_64) system
chmod +x /opt/jdk-6u45-linux-x64-rpm.bin
/opt/./jdk-6u45-linux-x64-rpm.bin
b) Installing the JAVA JDK7 package in CentOS 6
for 64bit (x86_64) system
rpm -Uvh /opt/jdk-7-linux-x64.rpm
for 32bit (x86) system
rpm -Uvh /opt/jdk-7-linux-i586.rpm
c) Installing the JAVA JDK8 package in CentOS 6
for 64bit (x86_64) system
rpm -Uvh /opt/jdk-8-linux-x64.rpm
for 32bit (x86) system
rpm -Uvh /opt/jdk-8-linux-i586.rpm
2. Once the JAVA JDK package is installed, I then needed to configure it on the system using the alternatives command. This is in order to tell the system what are the default commands for JAVA. Most sys admins aren’t aware about this and I think that it is a vital part when setting the JAVA package
a) Setting up the JAVA JDK6 package
alternatives --install /usr/bin/java java /usr/java/jdk1.6.0_45/jre/bin/java 20000
alternatives --install /usr/bin/jar jar /usr/java/jdk1.6.0_45/bin/jar 20000
alternatives --install /usr/bin/javac javac /usr/java/jdk1.6.0_45/bin/javac 20000
alternatives --install /usr/bin/javaws javaws /usr/java/jdk1.6.0_45/jre/bin/javaws 20000
alternatives --set java /usr/java/jdk1.6.0_45/jre/bin/java
alternatives --set javaws /usr/java/jdk1.6.0_45/jre/bin/javaws
alternatives --set javac /usr/java/jdk1.6.0_45/bin/javac
alternatives --set jar /usr/java/jdk1.6.0_45/bin/jar
this set the default commands for JAVA JDK6 and listing the /etc/alternatives/ directory showed the following
ls -lA /etc/alternatives/
lrwxrwxrwx. 1 root root 29 Feb 22 03:39 jar -> /usr/java/jdk1.6.0_45/bin/jar
lrwxrwxrwx. 1 root root 34 Feb 22 03:39 java -> /usr/java/jdk1.6.0_45/jre/bin/java
lrwxrwxrwx. 1 root root 31 Feb 22 03:39 javac -> /usr/java/jdk1.6.0_45/bin/javac
lrwxrwxrwx. 1 root root 36 Feb 22 03:39 javaws -> /usr/java/jdk1.6.0_45/jre/bin/javaws
b) Setting up the JAVA JDK7 package
alternatives --install /usr/bin/java java /usr/java/jdk1.7.0_51/jre/bin/java 20000
alternatives --install /usr/bin/jar jar /usr/java/jdk1.7.0_51/bin/jar 20000
alternatives --install /usr/bin/javac javac /usr/java/jdk1.7.0_51/bin/javac 20000
alternatives --install /usr/bin/javaws javaws /usr/java/jdk1.7.0_51/jre/bin/javaws 20000
alternatives --set java /usr/java/jdk1.7.0_51/jre/bin/java
alternatives --set javaws /usr/java/jdk1.7.0_51/jre/bin/javaws
alternatives --set javac /usr/java/jdk1.7.0_51/bin/javac
alternatives --set jar /usr/java/jdk1.7.0_51/bin/jar
this set the default commands for JAVA JDK7 and listing the /etc/alternatives/ directory showed the following
ls -lA /etc/alternatives/{jar,java*}
lrwxrwxrwx. 1 root root 29 Mar 7 04:13 /etc/alternatives/jar -> /usr/java/jdk1.7.0_51/bin/jar
lrwxrwxrwx. 1 root root 34 Mar 7 04:13 /etc/alternatives/java -> /usr/java/jdk1.7.0_51/jre/bin/java
lrwxrwxrwx. 1 root root 31 Mar 7 04:13 /etc/alternatives/javac -> /usr/java/jdk1.7.0_51/bin/javac
lrwxrwxrwx. 1 root root 36 Mar 7 04:13 /etc/alternatives/javaws -> /usr/java/jdk1.7.0_51/jre/bin/javaws
3. Finally I verified the installed version of JAVA
java -version
java version "1.7.0_51"
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)
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