Java APIs

I am just learning about JavaDocs and I'm having some problems. I keep getting this error no matter what I try:
javadoc: No public or protected classes found to document.

Here is my set up. I copied all my .java files to a src directory (they were in with the .class files, so I moved them). I have several packages, each with many objects.

I have objects in these classes:
/src/com/mycompany/package1/
/src/com/mycompany/package2/
/src/com/mycompany/package3/

When I run this command, I get the error mentioned:
javadoc -sourcepath /src/com -subpackages mycompany -classpath /src/com:$CLASSPATH

Any help would be appreciated.

Thanks,
Tyson