Use logger instead of printStackTrace()

[AzeemJiva]

Replace all usage of printStackTrace() with a proper logging mechanism.

[amitvc]

@AzeemJiva Can I pick up this issue please?

[AzeemJiva]

Yes!

[amitvc]

Do we want to use java.util.logging.Logger and allow users to configure log level etc or we are open to introducing something like log4j or slf4j?

[AzeemJiva]

Keeping the number of dependencies down is desirable. @yoroto your thoughts?

[amitvc]

@AzeemJiva I agree. I can start with what is provided in jdk. We can replace it later if we need to.

[yoroto]

@AzeemJiva Yes, we don't want to pull in those big packages, or anything would significantly affect allocation rate.