```
        private int scanIPv4Address(int start, int n, boolean strict)
            throws URISyntaxException
        {
            int p = start;
            int q;
            int m = scan(p, n, L_DIGIT | L_DOT, H_DIGIT | H_DOT);
            if ((m <= p) || (strict && (m != n)))
                return -1;
            for (;;) {
                // Per RFC2732: At most three digits per byte
                // Further constraint: Each element fits in a byte
                if ((q = scanByte(p, m)) <= p) break; p = q;
                if ((q = scan(p, m, '.')) <= p) break; p = q;
                if ((q = scanByte(p, m)) <= p) break; p = q;
                if ((q = scan(p, m, '.')) <= p) break; p = q;
                if ((q = scanByte(p, m)) <= p) break; p = q;
                if ((q = scan(p, m, '.')) <= p) break; p = q;
                if ((q = scanByte(p, m)) <= p) break; p = q;
                if (q < m) break;
                return q;
            }
            fail("Malformed IPv4 address", q);
            return -1;
        }
```

Looking into cpu profile data of one of our system, noticed the URISyntaxException threw at fail("Malformed IPv4 address", q) used about 0.3% CPU, we could add `-XX:+OmitStackTraceInFastThrow`, but after further looking into URI code, we think it should be fixed in JDK.