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Installing java

Testing if you already have java

Go to a console/dos prompt and type 'java -version', it it finds java (form SUN) version 1.4 and up, you are good to go.

Installing java on Mac

The latest java is always available on the Mac, that's why you got one smile

Installing java on Windows

Download the installer(latest JDK) here:

http://java.sun.com/javase/downloads/index.jsp
and run it.

You should add java to the PATH environment variable, otherwise windows won’t know where to find it.

Click Start > Control Panel > System on Windows XP or Start > Settings > Control Panel > System on Windows 2000.

Click Advanced > Environment Variables.

Add the location of bin folder of JDK installation for PATH in User Variables and System Variables. A typical value for PATH is:

C:\Program Files\Java\jdk1.xx\bin or c:\j2sdk1.4xx\bin   (browse to find it.)

Edit the PATH environment variable, it is a series of directories separated by semi-colons (;) and is not case sensitive. Microsoft Windows looks for programs in the PATH directories in order, from left to right.

* Add the path to java to the end of the PATH variable (after a semi column): for example if you already have “c:\windows\system32\", you will now have "c:\windows\system32\;c:\j2sdk1.4.2.15\bin\”.

Now If you type java -version in a new dos prompt, it should NOT say "not found" but rather show you your current java version.

You should probably reboot after installation completes.

Installing java on Linux

On some Linux Distributions you can install Java >=1.4(from sun) with a simple command.

You need the Sun java, the “free alternatives” like kaffe etc... probably won’t work

Because Sun java's is(was) not licensed under the GPL, some distributions make it difficult to install frown

Apt-Get

debian

sudo apt-get install sun-java5-jdk

If you have an older Debian or have not allowed ’non-free’ packages this package will not be found.
See here for more infos:

http://wiki.colar.net/installing_sun_java_on_debian_or_ubuntu

RPM

rpm

# For RPM, download the RPM packaged JRE from: [[http://java.sun.com/javase/downloads/index.jsp]]
chmod +x jdk-6-linux-i586-rpm.bin
./jdk-4-linux-i586-rpm.bin
#accept the license (press SPACE for a while, then answer 'y'. This will  give you a RPM, install it.
rpm -i jdk-6-linux-i586-rpm

Others

You can find a package for your distributions or simply download a ".bin" version of Java from Sun here:

http://java.sun.com/javase/downloads/index.jsp
and run it.

Shared archive error

Once on a fresh Debian install, i had the following error when running java (even just java -version)

An error has occured while processing the shared archive file.
Unable to reserve shared region.
Error occurred during initialization of VM
Unable to use shared archive.

It is fixed after running: java -Xshare:dump -version

Last modified: Wed Mar 05 17:32:34 EST 2008 by