Compact Profiles - Beginning Java 8 Fundamentals - page 758

Creating Custom JREs Using the EJDK
Oracle provides Java development kits for Java SE Embedded 8 (also called EJDK 8), enabling you to create custom JRE
bundles containing packages for a specific compact profile. Note that the EJDK is not a development kit used for Java
application development; rather, it is a tool to create a compact profile or the full JRE for specific platforms and CPU
architectures. EJDK 8 is available for the following Java SE Embedded platforms/CPU architectures:

• Linux/ARMv7 - VFP, HardFP ABI, Little Endian

• Linux /ARMv6/7- VFP, SoftFP ABI, Little Endian

• Linux/ARMv5 - Headless - SoftFP ABI, Little Endian

• Linux/ Power Architecture - Headless - e600 CPU variant with a Classic Floating Point Unit

• Linux /Power Architecture - Headless - e500v2 with double-precision SPE Floating Point Unit

• Linux /x86 Small Footprint - Headless

■ At the time of this writing, eJdKs support creating custom Jres only on linux platform. You cannot create
custom Jres for Windows and mac using eJdKs. However, you can download and use eJdKs on Windows to create
custom Jres for the listed platforms (linux) and the CpU architectures.

Note

Installing EJDK
You need to perform the following steps to install EJDK:

• Make sure you have installed JDK or JRE for Java SE 8 on your machine. One of them

(JDK or JRE) is required when you use EJDK 8.

• Download the EJDK installation file from the download page,

www.oracle.com/technetwork/
java/embedded/downloads/javase/index.html . There is a separate EDJK for all supported
platforms. Please download the EJDK installation file for the platform on which you will
be deploying your custom created JRE. In the example, I will use EJDK 8 for the Linux/x86
platform. The installation files have the extension .tar.gz .
Unzip the EJDK installation file into a directory such as

•

/home/ksharan , On Linux, you can use
the gunzip or gzip tool to unzip the file; on Windows, you can use any ZIP tool such as 7-zip
or WinZip . When you unzip the file on Windows, you need to unzip it twice as a .tar.gz files
uses double compression.

• Unzipping the EJDK installation file will create an

ejdk1.8.0 directory that contains the
EJDK files. At this point, you should have a directory called /home/ksharan/ejdk1.8.0 .
This completes the installation of the EJDK 8. On Windows, the path may be
C:\ksharan\ejdk1.8.0 .