Install Java 8 in CentOS 7

Installing Java 8 in CentOS.

sudo yum install java-1.8.0-openjdk

Verify: java -version

If you want tools like jstatd etc devel tools, you need to install

sudo yum install java-1.8.0-openjdk-devel

Verify: rpm -qa | grep java

For monitoring GC by jvisualvm

Create jstatd policy file by:

vi /tmp/jstatd.all.policy

grant codebase "file:${java.home}/../lib/tools.jar" {
   permission java.security.AllPermission;
};

Start the process by, jstatd -J-Djava.security.policy=/tmp/jstatd.all.policy

**In above policy file, find java.home easily by

find / -name tools.jar
example output: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.151-5.b12.el7_4.x86_64/lib/tools.jar

Update the complete path from the above output

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