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JAVA CLASSPATH setting



Source: http://weka.wikispaces.com/CLASSPATH

Win32 (2k and XP)

We assume that the mysql-connector-java-3.1.8-bin.jar archive is located in the following directory:
  • C:\Program Files\Weka-3-4
In the Control Panel click on System (or right click on My Computer and select Properties) and then go to the Advanced tab. There you will find a button called Environment Variables, click it.
Depending on, whether you're the only person using this computer or it is a lab computer shared by many, you can either create a new system-wide (you are the only user) environment variable or a user dependent one (recommended for multi-user machines). Enter the following name for the variable
  • CLASSPATH
and add this value
  • C:\Program Files\Weka-3-4\mysql-connector-java-3.1.8-bin.jar
If you want to add additional jars, you'll have to separate them with the path separator, the semicolon ; (no spaces!).

Unix/Linux

I assume, that the mysql jar is located in the following directory:
  • /home/johndoe/jars/
Open a shell and execute the following command, depending on the shell you're using:
  • bash
    export CLASSPATH=$CLASSPATH:/home/johndoe/jars/mysql-connector-java-3.1.8-bin.jar
  • c shell
    setenv CLASSPATH $CLASSPATH:/home/johndoe/jars/mysql-connector-java-3.1.8-bin.jar

Unix/Linux uses the colon : as path separator, in contrast to Win32, which uses the semicolon ;

Run before adding external jar Unix/Linux

 java -jar weka.jar

Run after adding external jar Unix/Linux 

You can not use same command java -jar , when you add external jar. You have to 
use java -classpath 
 
java -classpath $CLASSPATH:weka.jar:libsvm.jar weka.gui.GUIChooser  (linux )
 
java -classpath "%CLASSPATH%;weka.jar;libsvm.jar" weka.gui.GUIChooser (windows)

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