Cullen Programming

JAVA Run Environment Setup Help

The JAVA 2 Platform Standard Edition (J2SE) Run Environment (JRE) is provided free of charge by Oracle Corporation(SunMicrosystems). Oracle has a version available for every operating system platform.

The installation of the JRE is simple, straightforward and painless. It takes only a few minutes of your time. The safe and reliable JAVA Platform code does not change any other vendor's software on your computer system. 

Upon completion of these steps your computer will be JAVA enabled for any JAVA language program.  

Steps

• Go to SunMicrosystems website ( java.sun.com) to obtain the JAVA SE  Java Platform.
• Select the JAVA Run Environment (JRE) for your particular operating system (Windows, Linux, etc).
• Download the J2SE JRE to your machine.
• See Sun's download page information so you can view the installation instructions.
• For Windows users the installation instructions will simply have you execute the file that you have just downloaded.
• Linux users will be instructed to use RPM or TAR UNZIP.
• Windows users may require a reboot of your machine.
• The JAVA Run Environment is READY TO USE.

Windows Users

Ensure that your JAVA environment is setup by adding it to the beginning of your CLASSPATH and PATH system environmental variables. This is usually performed automatically upon installation of the JAVA product. The JAVA product is normally installed under "Program Files/JAVA". The Windows library concatenation logic should be able to locate all necessary product code.  You can check that your CLASSPATH and PATH has been updated by issuing the following command from a Command Window:

SET

Now check the lines showing CLASSPATH and PATH.

Normally, you can find the "java.exe" file at:

C:/"Program Files"/java/j2re1.x.y.z_r/bin/java.exe

and the run-time archive file at:

C:/"Program Files"/java/j2re1.x.y.z_r/lib/rt.jar

To update your Windows System Environment variables go to 

Settings --> Control Panel --> System --> Advanced --> Environment Variables.

 Then select the PATH and CLASSPATH to edit and add your changes.

Linux Users

Ensure that your JAVA environment is setup by adding the "bin" files to the beginning of your PATH system environmental variables, and the "lib" files to the beginning of your CLASSPATH system environmental variables.  This can be done in either the system "profile" or the user ".bash_profile" files.  Note that the example below of the .bash_profile uses a former SunMicrosystems JAVA JRE version.  You will have to change this to match the version number that you are using.  The JRE is nomally placed by the SunMicrosystems installer into the /usr/java/... directory or folder.

# .bash_profile
# Get the aliases and functions
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi
# User specific environment and startup programs
JAVADIR="j2re1.6.2_xx"    (note you must ensure that the proper version and release number are coded here)
export JAVADIR
PATH=/usr/java/$JAVADIR/bin:$PATH:$HOME/bin:/sbin
export PATH
CLASSPATH=/usr/java/$JAVADIR/lib:/usr/NetRexx/runlib/NetRexxR.jar
export CLASSPATH

This will take effect the next time that you logon to the system.
To have it take effect immediately enter the following command:

source .bash_profile

Optionally you can manually build the variables and "export" them to the system.

JAVADIR="j2re1.6.2_xx"    (note same as above)
export JAVADIR
PATH=/usr/java/$JAVADIR/bin:$PATH:$HOME/bin:/sbin
export PATH
CLASSPATH=/usr/java/$JAVADIR/lib:/usr/NetRexx/runlib/NetRexxR.jar
export CLASSPATH

You can check the settings by typing on a Terminal Command Window the following:

echo $PATH
echo $CLASSPATH

Congratulations, Your machine is now JAVA Enabled.

You are now ready to install Cullen Programming JAVA based software applications, as well as running JAVA Applets on your favorite browser.

Please use you browser's Return button to return to Product Installation.

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