I need help i get a no class def found error

i am very new to java, and i am taking it as part of my computer science class for university, and here is my problem.
after i compile a program i get this error
java.lang.NoClassDefFoundError: C:\Sun\AppServer\bin\FoodItem/java
Exception in thread "main"
Tool completed with exit code 1
i dont' know what it means or how i can fix it, and i have installed and reinstalled the program several times, but that did not help, and i am very unsure what else i should do. and i am very stressed because i have an assignment to submit, in several days and i have nothing working.
i am running XP home, and i'm beginning to wonder if that has anything to do with why the program won't run.
my thanks in advance for any help from anyone

I have been programming in java for 4 years now. Im
used to using the mac version of the Java 4 SDK.
However I recently started using the Windows version
of Java 5, and after compiling all the java files in
one directory I try to run the main class using
java CeltQuestHowever this gives me the NO CLASS DEF FOUND error
mentioned above. I have repeatedly checked that Im in
the correct directory, and I have also checked that
all the class files are there.
It's a little confusing because I can't tell whether you entered java CeltQuest before or after you deleted all of the .class files.
Anyway, you must successfully compile the code to produce a .class file. If your CeltQuest class is NOT in a named package, then try "java -classpath . CeltQuest"
Even though you have previously used java on a Mac, you might benefit from the Geting Started tutorial for Windows: http://java.sun.com/docs/books/tutorial/

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