How to define a property in JMeter.
Properties are global to a JMeter instance.
LOOPS=${__P(loops,10))}
This uses the value of the property “loops”, defaulting to 10 if the property is not found.
The “loops” property can be defined on the JMeter command-line with the J option:
jmeter ... -Jloops=12 ... .
You can define properties by editing a property file
props.put("PROP1","1234");
There is a Debug_Sampler that can show all property and variable values.