IBM User Guide for Java V7 on Windows > IBM SDK for Java > The collector and the allocator > The collector and the allocator

Reachable objects

Reachable objects are found using frames on the thread stack.

The active state of the JVM is made up of...

• Stacks that represent threads
• Static fields inside Java classes
• Local and global JNI references

Functions called inside the JVM cause a frame to be created on the thread stack. This information is used to find the roots, which are objects that have a reference to it from outside the heap. These roots are then used to find references to other objects. This process is repeated until all reachable objects are found.

Parent: The collector and the allocator

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