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We recommend installing the latest version of Oracle JDK (Java Development Kit), because JDK has a number of useful diagnostics tools that JVM lacks.

JDK installation from repository

JDK installation from OS repository (CentOS for example) should be done as follows

yum -y install java-1.8.0-openjdk-devel

Manual JDK installation

To install JDK manually, download the installation package or archive from oracle.com. The recommended version is JDK 1.8 update 161 or higher.

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#Unpack the archive
$tartar -xvzf jdk-8u161-linux-x64.tar.gz

#Copy to the destination folder
# in CentOS 7 the -R option is not specified
mv -R jdk1.8.0_161 /usr/java/jdk1.8.0_161

#For convenience, create a link to the path
$lnln -sf /usr/java/jdk1.8.0_161 /usr/java/default

#Create a link to the java executable
$lnln -sf /usr/java/default/bin/java /usr/bin/java

#Create utility links
ln -sf /usr/java/default/bin/jstack /usr/bin/jstack
ln -sf /usr/java/default/bin/jcmd /usr/bin/jcmd
ln -sf /usr/java/default/bin/jmap /usr/bin/jmap

Installation checking

To check JDK installation use the following command

java -version

JDK installing is done

Here is how the server with installed JVM / JDK looks. Please notice the line: 64-Bit Server VM. Java works in the 64-bit mode with the server settings.

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