Java class will not run (command prompt)

Java class will not run (command prompt)

I have been fighting with this program for a little while now and cannot
figure out what is wrong. Any help would be greatly appreciated.
So here's the issue. I have three classes one is for logging onto a mysql
database, the other is to output data from the database, and the last one
holds method main. I was having a huge issue with getting them to compile
getting errors about not finding a symbol for a method in a different
class. I finally got them to all compile by using command "javac -d
bin/cdtPack src/CDT.java src/login.java src/ClientBase.java"
But, now when I try to run the class with method main I get error:
"Exception in thread "main" java.lang.noClassDefFoundError: CDT (wrong
name: cdtPack/CDT)" then a list of at java....
Anyone have an idea what could be going wrong?