Running Java app on UNIX

Hi all, Any kind of help is much appreciated.
I am trying to run a Java program on Unix which also imports packages of a 3rd party vendor.
I run it from the directory where i have my MyProgram.java file stored and also provide the classpath for the .jar/.zip files of the 3rd party vendor (using -classpath option with javac)
Compiling is clean with no errors.
But, on running the java command: java MyProgram
It gives me java.lang.NoClassDefErrorFound for a class which came with the 3rd party vendor.
The class is present in the .jar file, which I provided in the -classpath option with javac. There are many other classes present in the same .jar file which are being used in the program but it just gives the error for this particular class.
-I also tried by saving that class in my current directory and compiled it with
javac <-classpath> MyProgram.java 3rdVendor.java
command and created its .class file in the current directory but then again using java command from the same directory gives the same error: java.lang.NoClassDefFoundError
Plzz....help
Thanx Shaan

here is the command i used
javac -classpath .:/home/top/MyName/dir1/jcommom-0.9.7/jcommon-0.9.7.jar:/home/top/MyName/dir1/jfreechart-0.9.21/jfreechart-0.9.21.jar DyanmicChart.java
COMPILATION IS WITH NO ERRORS
and then I run java from the same directory where i have DynamicChart.class built
java DynamicChart
error in class Main : java.lang.NoClassDefFoundError for org/jfree/data/time/RegularTimePeriod
RegularTimePeriod is present in jfreechart-0.9.21.jar and its .java file is located in the folder jfreechart-0.9.21/source/org/jfree/data/time/RegularTimePeriod.java
There are lot of other classes that I use from .jar files mentioned in the classpath but its just this one class. I also saved the RegularTimePeriod.java file in the pwd to built its .class in the current directory and compiled it using the above (javac) command with DynamicChart.java. AGAIN NO COMPILATION ERRORS...but the same error when i run: java DynamicChart
Shaan

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