Axis2 question

Hi,

I have question regarding Axis2. Noticed that using axis just generate the stub part of the code is enough to run web service. I was following this guide http://wso2.org/library/1719

So when is the skeleton code generation is needed and under what condition. I also noticed that the samples that came together with axis2 downloads does not need stub and skeleton generation like the pojo sample.
And also some sample client uses RPC approach and was wondering whether RPC is still current.
I am new at this so not sure which approach is more current.

Thank you