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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
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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
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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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