What causes a 'java.lang.OutOfMemoryError: Java heap space' error in JMeter?

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Grade: Education Subject: Support
What causes a 'java.lang.OutOfMemoryError: Java heap space' error in JMeter?
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This error occurs when JMeter attempts to allocate more memory in the Java heap than is currently available. It typically happens when JMeter is processing a large number of requests, storing a lot of test data, or has a complex test plan that consumes significant memory.