download java ex jdk-8u171-linux-x64.tar.gz
scp -i /Users/chandrakumar/pmay/chanduaws.pem  jdk-8u171-linux-x64.tar.gz ec2-user@host-name:
ssh -i /Users/chandrakumar/pmay/chanduaws.pem ec2-user@host-name

mkdir /usr/java    create dir java in usr
cd /usr/java
cp /home/ec2-user/temp/jdk-8u171-linux-x64.tar.gz .
. means copy to current directory
tar xzf jdk-8u171-linux-x64.tar.gz
chown -R root:root jdk1.8.0_171
alternatives --install /usr/bin/java java /usr/java/jdk1.8.0_171/bin/java 1
alternatives --config java

There are 2 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
*+ 1           /usr/lib/jvm/jre-1.8.0-openjdk.x86_64/bin/java
   2           /usr/java/jdk1.8.0_171/bin/java

Enter to keep the current selection[+], or type selection number: 2


alternatives --config java
There are 2 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
*  1           /usr/lib/jvm/jre-1.8.0-openjdk.x86_64/bin/java
 + 2           /usr/java/jdk1.8.0_171/bin/java

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

---- SET JAVA HOME --

cd /etc/profile.d

vi java.sh

export JAVA_HOME='/usr/java/jdk1.8.0_171'


----install keytool ----

update-alternatives --install /usr/bin/keytool keytool /usr/java/jdk1.8.0_171/bin/keytool 100