Java StackOverflowError

Analyze the StackOverflowError and see a solution for recursive methods.

StackOverflowError. As a method is called, it occupies a frame on the stack—an activation record. In a recursive method, many methods can be called, deeper and deeper.

At some depth, this causes an error—a StackOverflowError. The program will terminate. And we will be left with a confusing message.

An example. This program provokes a java.lang.StackOverflowError. It never terminates. The output is truncated in this example—many more x() calls are reported.

Note: This program is hopeless in its current form. With a count argument, though, we can prevent excess recursion.

Java program that causes StackOverflowError public class Program { public static void x() { // This recurses infinitely. x(); } public static void main(String[] args) { // Call the x method the first time. x(); } } Output Exception in thread "main" java.lang.StackOverflowError at Program.x( at Program.x( at Program.x( at Program.x( ...

Check depth. Here we introduce a count argument (an int) to our x() method. We add one to count on each nested call to "x." This restricts the depth of recursion.

Tip: This program will only ever have a recursion depth of 11 (it starts at 0 and continues until 10).

Java program that checks recursion depth public class Program { public static void x(int count) { // Check the count argument to prevent StackOverflowError. if (count >= 10) { return; } x(count + 1); } public static void main(String[] args) { // Begin. x(0); System.out.println("Done"); } } Output Done

With StackOverflowError, we have a descriptive error. Our program has a stack depth that is too great. We can restrict stack depth in certain recursive methods with an argument.Exceptions
Dot Net Perls
© 2007-2020 Sam Allen. Every person is special and unique. Send bug reports to