How do I pass a variable from one Thread Group to another in JMeter

Question

I have a JMeter test with 2 Thread Groups - the first is a single thread (which creates some inventory) and the second has multiple threads (which purchase all the inventory

Answer 1

This is not possible in JMeter, because it is not normal client behavior (sharing parameters between Threads). Instead of this use one Thread-Group with Controllers:

Thread Group
+ Create inventory
+ + XPath
+ Loop
+ + Purchase inventory