Convert the current stack to a checksum hex string which we can use in logs to identify call stack differences

StackToHash.java

public class DebugUtil {
  public static String stackHash() {
    try {
      // code from https://www.baeldung.com/java-stacktrace-to-string
      StringWriter sw = new StringWriter();
      PrintWriter pw = new PrintWriter(sw);
      new RuntimeException().printStackTrace(pw);

      // checksuming for speed
      int sum = 0;
      for(char c : pw.toString().toCharArray()) {
        sum += (int)c;
      }
      return Integer.toHexString(sum);
    } catch(IOException err) {
      return "Invalid Stack";
    }
  }
  
}

This simple function is useful for debugging code. Instead of doing printStackTrace and looking for minor differences in the logs we can use this function to make sure the calls are arriving from a well know stack. We can use this in conditional breakpoints to stop if the method is invoked from a different stack too.