Why 5000 GC root objects?

Hi,
using a JVMTI agent I found out that our application has more than 5000 root objects for GC. I would expect that there are some root objects for each thread used, but we only have ~20 Threads per process.
The list of roots shows lots of class objects (not all) and some other java.lang.* objects. But what I was wondering about is that several application specific objects are classified as roots too.
So, here are my questions:
1. In Java we have object trees. Does each tree has only one single root or several roots?
2. Do we even have several trees?
3. What is nessecary to classify an application object as root!
4. Why exist so many roots? Is it due to performance gain as shorter paths are necessary to identify an object as alive?
If you can tell me where I can find the answers (papers, books, ... ) it would be enough even though a direct answer is welcome too :-).
Thanks ---Robert

At first: what I call roots in the sense of JVMTI are those "always alive bootstrap loaded classes" ?
Then with that my problem is that I do not only have class objects as roots. There are several thread objects, error and exception objects and even byte/short/integer array elements which are classified as roots. Additional there are those application OBJECTS which are classified as roots.
Its seems to me that you always speak about class objects as roots, but I have about 60% out of those 5000 roots as normal objects.
[Bootstrap classpath]
All classes from this class path become roots as they are loaded by the bootstrap loader?
--Robert

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rp0428 wrote:
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bye
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