[newbie] Classes in OpenJDK

[Aki Kyo]

Hi,

Please be gentle, I have newbie question:

I'm building a application made by another organization. The
installation instructions said to get the Sun JDK - now Oracle?, but
still different than OpenJDK, right? I wanted build it with OpenJDK if
possible. Compilation success but at run time I get a
NoClassDefFoundError - I guess it might due to difference in libraries
that the application author expects to be available in the JDK. (??)

The class here is com/sun/mail/dsn/Report

But just general question - is there way I can see list of classes in
OpenJDK? Compare to Sun JDK?

Thank you sincere