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Testing / Apache JMeter Interview questions

What is the difference between JSR223 and BeanShell elements?

Both JSR223 and BeanShell elements let you run custom scripting logic (as a Pre-Processor, Post-Processor, Sampler, or Assertion) directly inside a test plan, for cases the built-in elements don't cover.

JSR223 elements are generally recommended over BeanShell because JSR223, typically used with the Groovy scripting language, compiles and caches scripts for reuse across iterations, giving meaningfully better performance at scale, while BeanShell interprets the script fresh on every single execution, adding overhead that compounds significantly under high thread counts.

Because of this performance gap, official JMeter guidance and most current best practice recommends using JSR223 with Groovy for new custom scripting needs, treating BeanShell largely as a legacy option kept for backward compatibility with older test plans rather than a first choice for new work.

JSR223 elements generally outperform BeanShell because JSR223:
Current best practice for new custom scripting is to use:

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