To Set Environment Variable

Right click on mycomputerpropertiesadvanced-environment variable

Click on uservariable

Type variable name: path

Variable value: C:\Program Files\Java\jdk1.6.0\bin;

Click on system variable

variable name: JAVA_HOME

Variable value: C:\Program Files\Java\jdk1.6.0

Click on system variable

variable name: classpath

Variable value: C:\Program Files\apache-tomcat-6.0.36\lib\servlet-api.jar