How to install Oracle Java 12 in Ubuntu Linux Systems. Java Platform, Standard Edition (Java SE) lets you develop and deploy Java applications on desktops and servers. Java offers the rich user interface, performance, versatility, portability, and security that today’s applications require.
Oracle Java 12 – Features
- Support for Unicode 11 – The JDK 12 release includes support for Unicode 11.0.0. Following the release of JDK 11, which supported Unicode 10.0.0.
- POSIX_SPAWN Option on Linux – As an additional way to launch processes on Linux, the jdk.lang.Process.launchMechanism property can be set to POSIX_SPAWN. This option has been available for a long time on other *nix platforms. The default launch mechanism (VFORK) on Linux is unchanged, so this additional option does not affect existing installations. POSIX_SPAWN mitigates rare pathological cases when spawning child processes, but it has not yet been excessively tested. Prudence is advised when using POSIX_SPAWN in productive installations.
- JEP 334 JVM Constants API – The new package java.lang.invoke.constant introduces an API to model nominal descriptions of class file and run-time artifacts, in particular constants that are loadable from the constant pool. It does so by defining a family of value-based symbolic reference (JVMS 5.1) types, capable of describing each kind of loadable constant. A symbolic reference describes a loadable constant in purely nominal form, separate from class loading or accessibility context. Some classes can act as their own symbolic references (e.g., String); for linkable constants a family of symbolic reference types has been added (ClassDesc, MethodTypeDesc, MethodHandleDesc, and DynamicConstantDesc) that contain the nominal information to describe these constants.
- Allocation of Old Generation of Java Heap on Alternate Memory Devices – This experimental feature in G1 and Parallel GC allows them to allocate the old generation of the Java heap on an alternative memory device such as NV-DIMM memory. The current implementation pre-allocates the full Java heap size in the NV-DIMM file system to avoid problems with dynamic generation sizing. Users need to make sure there is enough free space on the NV-DIMM file system.
- New Java Flight Recorder (JFR) Security Events – Four new JFR events have been added to the security library area. These events are disabled by default and can be enabled via the JFR configuration files or via standard JFR options.
You can read the full release here https://www.oracle.com/technetwork/java/javase/12-relnote-issues-5211422.html
Install Oracle Java 12
Run the following commands in terminal to install Oracle Java 12 via PPA:
sudo add-apt-repository ppa:linuxuprising/java sudo apt-get update sudo apt-get install oracle-java12-installer sudo apt-get install oracle-java12-set-default
On Debian 64 Bit
echo "deb http://ppa.launchpad.net/linuxuprising/java/ubuntu bionic main" | tee /etc/apt/sources.list.d/linuxuprising-java.list sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 73C3DB2A sudo apt-get update sudo apt-get install oracle-java12-installer exit
Please Note – End of Public Updates for Oracle JDK 8
Oracle will not post further updates of Java SE 8 to its public download sites for commercial use after January 2019. Customers who need continued access to critical bug fixes and security fixes as well as general maintenance for Java SE 8 or previous versions can get long term support through Oracle Java SE Subscription or Oracle Java SE Desktop Subscription. For more information, and details on how to receive longer term support for Oracle JDK 8.