I ran into this StackOverflowError while developing https://github.com/openjdk/jdk/pull/1940

public class RegexStackOverflow {
    public static void main(String[] args) throws Throwable {
        int size = 4096; // 1024 is OK
        java.util.regex.Pattern.compile("(?:X|X)*")
            .matcher("X".repeat(size) + "!")
            .matches();
    }
}

=>
Exception in thread "main" java.lang.StackOverflowError
at java.base/java.util.regex.Pattern.lambda$Single$7(Pattern.java:5711)
at java.base/java.util.regex.Pattern$BmpCharProperty.match(Pattern.java:3966)
at java.base/java.util.regex.Pattern$Branch.match(Pattern.java:4746)
at java.base/java.util.regex.Pattern$GroupHead.match(Pattern.java:4801)
at java.base/java.util.regex.Pattern$Loop.match(Pattern.java:4910)
at java.base/java.util.regex.Pattern$GroupTail.match(Pattern.java:4832)
at java.base/java.util.regex.Pattern$BranchConn.match(Pattern.java:4710)
at java.base/java.util.regex.Pattern$BmpCharProperty.match(Pattern.java:3967)

the part of the stack around main is not shown, which is not great. If you're going to leave out part of a stack trace for stack overflow, leave out the stuff in the middle!