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A StackOverflowError in Java is a runtime error that occurs when the call stack memory allocated by the Java Virtual Machine (JVM) is exceeded. This error is typically caused by deep or infinite recursion, where a method calls itself repeatedly without a proper termination condition1.
Causes of StackOverflowError
Infinite Recursion: The most common cause of a StackOverflowError is infinite recursion. This happens when a recursive method does not have a proper base case to terminate the recursion. For example: public class StackOverflowDemo { public static void recursiveMethod() { recursiveMethod(); // No termination condition } public static void main(String[] args) { recursiveMethod(); } } In this example, the recursiveMethod calls itself indefinitely, leading to a StackOverflowError1.
Excessive Deep Recursion: Even if a recursive method has a termination condition, it can still cause a StackOverflowError if the recursion depth is too deep. For instance, calculating the factorial of a very large number using recursion can lead to this error2.
Cyclic Relationships Between Classes: This occurs when two or more classes instantiate each other in their constructors, leading to an infinite loop of object creation. For example: public class A1 { public A2 type2; public A1() { type2 = new A2(); } public static void main(String[] args) { A1 type1 = new A1(); } } class A2 { public A1 type1; public A2() { type1 = new A1(); } } In this example, the constructors of A1 and A2 call each other indefinitely, causing a StackOverflowError3.
How does a "stack overflow" occur and how do you prevent it?
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