What actually causes a Stack Overflow error? [duplicate]

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It seems you’re thinking that a stackoverflow error is like a buffer overflow exception in native programs, when there is a risk of writing into memory that had not been allocated for the buffer, and thus to corrupt some other memory locations. It’s not the case at all.

JVM has a given memory allocated for each stack of each thread, and if an attempt to call a method happens to fill this memory, JVM throws an error. Just like it would do if you were trying to write at index N of an array of length N. No memory corruption can happen. The stack can not write into the heap.

A StackOverflowError is to the stack what an OutOfMemoryError is to the heap: it simply signals that there is no more memory available.

Description from Virtual Machine Errors (ยง6.3)

StackOverflowError: The Java Virtual Machine implementation has run out of stack space for a thread, typically because the thread is doing an unbounded number of recursive invocations as a result of a fault in the executing program.

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