Short questions about GCJ

[Harmanpaul S Gill]

Hello 
I had two simple questions about GCJ
1. What is meant by libgcj being "conservative"
garbage collector? How does it differ from JRE
provided by SUN?
2. Does GCJ project has some collaboration or
relationship  with Sun Microsystems?
2. When was GCJ project started?

I'll appreciate your reply. Thanks.

Harman

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