Exception

[Vera Permata Sari]

Hello all... I have a problem nich...   everytime I try to launch my class with this command: D:\Chart\coba1>java oracle this message always occurs: Exception in thread "main" java.lang.NoClassDefFoundError: oracle   and if I change the command into: D:\Chart\coba1>java -classpath "." Oracle this message occurs: Exception in thread "main" java.lang.NoClassDefFoundError: oracle/jdbc/driver/OracleDriver         at Oracle.connect(Oracle.java:30)         at Oracle.main(Oracle.java, Compiled Code)   and, if I change the command into: D:\Chart\coba1>java -classpath ".;c:\classes" Oracle my system hangs.... it doesn't show any error message or anything.   please guys... do you know what's wrong? I have put all my jar files (after I extract them) into one directory: c:\classes ('cause I was so desperate)... :) thanks for your attention...   -Vera-