Java Reference
In-Depth Information
Running the jrecreate Command
The
ejdk1.8.0
directory contains three subdirectories:
bin
•
lib
•
target
(e.g. named
linux_i586
for EJDK on Linux/x86)
•
On Linux, you can use the
ls
command to list the contents of the
ejdk1.8.0
directory:
[/home/ksharan]$ ls ejdk1.8.0
bin lib linux_i586
The
bin
directory contains the following files:
jrecreate.bat
•
jrecreate.sh
•
jrecreate.config.properties
There are two files for the
jrecreate
command: one with extension
.bat
and one with extension
.sh
. Both files
are the
jrecreate
tool. You need to use the
jrecreate.bat
file on Windows and the
jrecreate.sh
file on Linux. I will
use the
jrecreate.sh
file because I ran all examples on Linux.
The
jrecreate.config.properties
file is a configuration file for the
jrecreate
tool. Typically, you do not need
to change anything in this file. You can look at the file's contents; it contains comments that explain the purpose of
properties and how to change them. I will not cover editing this file. I will focus on only the
jrecreate
tool.
The
lib
directory contains the implementation files for the
jrecreate
command.
The
target
directory is named differently on different platforms. The name represents the platform and the CPU
architecture. For example, the directory is named
linux_i586
for Linux/x86; it is named
linux_ppc
for Linux/Power
Architecture - Headless -e600 CPU variant with a Classic Floating Point Unit.
You are just one step away from using the
jrecreate
command to create custom JREs. The command depends
on the
JAVA_HOME
environment variable to work, which must be set to the installed JDK or JRE directory for Java SE 8.
If the
JAVA_HOME
is not set, running the
jrecreate
command will print an error message stating that the
JAVA_HOME
is
not set.
On Linux, assuming the JDK or JRE for Java SE 8 is installed in
/home/ksharan/java8
, you can use the following
command to set the
JAVA_HOME
environment variable:
•
[/home/ksharan]$ export JAVA_HOME=/home/ksharan/java8
On Windows, assuming that the JDK or JRE for Java SE 8 is installed in
C:\java8
, you can set the
JAVA_HOME
environment variable as follows:
C:\>SET JAVA_HOME=C:\java8
On Linux, the syntax to run the jrecreate command is
jrecreate.sh <options>
On Windows, the syntax to run the jrecreate command is
jrecreate.bat <options>
