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martes, 11 de junio de 2019

Oracle Java Support and Updates Included in Oracle Cloud Infrastructure


By Sergio Leunissen

We recently announced that Oracle Java, Oracle’s widely adopted and proven Java Development Kit, is now included with Oracle Cloud Infrastructure subscriptions at no extra cost.

In this blog post I show how to install Oracle Java on Oracle Linux running in an OCI compute shape by using RPMs available yum servers available within OCI.

Installing Oracle Java 

The Oracle Java RPMs are in the ol7_oci_included repository on Oracle Linux yum server accessible from within OCI.

To enable this repository:

$ sudo yum install -y --enablerepo=ol7_ociyum_config oci-included-release-el7 

As of this writing, the repository containst Oracle Java 8, 11 and 12.

$ yum list jdk* Loaded plugins: langpacks, ulninfo Available Packages jdk-11.0.3.x86_64 2000:11.0.3-ga ol7_oci_included jdk-12.0.1.x86_64 2000:12.0.1-ga ol7_oci_included jdk1.8.x86_64 2000:1.8.0_211-fcs ol7_oci_included 

To install Oracle Java 12, version 12.0.1:

$ sudo yum install jdk-12.0.1 

To confirm the Java version:

$ java -version java version "12.0.1" 2019-04-16 Java(TM) SE Runtime Environment (build 12.0.1+12) Java HotSpot(TM) 64-Bit Server VM (build 12.0.1+12, mixed mode, sharing) Multiple JDK versions and setting the default 

If you install multiple version of the JDK, you may want to set the default version using alternatives. For example, let’s first install Oracle Java 8:

$ sudo yum install -y jdk1.8 

The alternatives command shows that two programs provide java:

$ sudo alternatives --config java 

There are 2 programs which provide 'java'. 
Selection Command ----------------------------------------------- *+ 1 /usr/java/jdk-12.0.1/bin/java 2 /usr/java/jdk1.8.0_211-amd64/jre/bin/java 

Choosing selection 2 sets the default to JDK 1.8 (Oracle Java 8):

$ java -version java version "1.8.0_211" Java(TM) SE Runtime Environment (build 1.8.0_211-b12) Java HotSpot(TM) 64-Bit Server VM (build 25.211-b12, mixed mode) Conclusion 

Oracle Cloud Infrastructure includes Oracle Java —with support and updates— at no additional cost. By providing Oracle Java RPMs in OCI’s yum servers, installation is greatly simplified.

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