New to java .. new to license - use of javac...

Hello,
I was wondering about the sdk license from sun's jdk...
Can somebody explain me if i'am right or not and when not then why?
- The sdk contains the javac compiler.
Calling this compiler through my java code in process (via main()-method call)
is allowed? is it illegal?
Calling this compiler with some wrapper classes to catch the error messages
and warnings is allowed? is it illegal?
- There are some other sun.* packages which are not documented...
Can i use/extend those classes at my own risk?
or is it illegal at all? And then when its illegal what is so "open" and free about java?
Are there more public versions of java available?
How can I make products and sell them without a big laywer department?
greetings and thanks from an really irritated newby

As I said I know that javac is only inside the SDK.
But I don't know if it is allowed to extend such classes
and then if customers install the jdk can make
use of the extended SDK classes...
Greetings and Thanks
a newbie

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tt2

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