I usually use the following configuration, hoping to help you! Step1:JAVA_HOME=C:\Program Files\Java\jdk1.6.0_06; Step2:CLASSPATH=C:\ProgramFiles\Java\jdk1.6.0_06\lib\dt.jar;C:\ProgramFiles\Java\jdk1.6.0_06\lib\tools.jar; Step3:Path=C:\Program Files\Java\jdk1.6.0_06\bin;