What is the difference between a BeanShell Sampler and a BeanShell PostProcessor in JMeter?

A BeanShell Sampler is itself a request-generating element - its script is responsible for performing the actual action being measured, which might be a custom protocol call, a calculation, or anything else the script defines, and it produces its own SampleResult.

A BeanShell PostProcessor, by contrast, doesn't generate a request of its own; it attaches to another sampler and runs after that sampler completes, typically used to process or extract data from that sampler's response rather than to perform the primary measured action itself.

Both give you a script namespace with the same implicit JMeter variables available, but they serve different structural roles in a test plan - the Sampler is the thing being measured, while the PostProcessor supports and reacts to a measurement that already happened elsewhere.

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