algorithm - Java Mergesort Implementation having a stackoverflow error -

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i'm not quite sure why merge sort implementation getting stackoverflow error. i've reviewed code multiple times i'm not getting why happening. tried debugging have had trouble understanding why values 0 , 4 (the first , last index of array) never change when walk through code. , throws stack overflow error.

the first recursive call mergesort (line 17?) should use "start, mid", not "start, end". puts in endless loop, run out of stack.

trust debugger.


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