Java and Memory

I discovered that Java is leaking memory. My program memory was still growing and growing. Serahcing around, I discovered an article in DrDobb's Journal February 2000, p115 Java Q&A. I explained all this very well. See: http://www.ddj.com/articles/2000/0002/0002l/0002l.htm

It explains that Java has "loiters". (Not "leaks" like C++) To solve them, I tried JProbe and OptimizeIt, but I still have some loiters left.

Has anyone already deal with memory problems?
What kind of tools do you use?
Does it take long to solve?
Have you had many such problems?

Thanks
Didier