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    <p>This has obviously been fixed in newer releases (SE 6 and 7). I experience a 30 second caching time max when running the following code snippet while watching port 53 activity using tcpdump.</p> <pre><code>/** * http://stackoverflow.com/questions/1256556/any-way-to-make-java-honor-the-dns-caching-timeout-ttl * * Result: Java 6 distributed with Ubuntu 12.04 and Java 7 u15 downloaded from Oracle have * an expiry time for dns lookups of approx. 30 seconds. */ import java.util.*; import java.text.*; import java.security.*; import java.net.InetAddress; import java.net.UnknownHostException; import java.io.BufferedReader; import java.io.InputStreamReader; import java.io.InputStream; import java.net.URL; import java.net.URLConnection; public class Test { final static String hostname = "www.google.com"; public static void main(String[] args) { // only required for Java SE 5 and lower: //Security.setProperty("networkaddress.cache.ttl", "30"); System.out.println(Security.getProperty("networkaddress.cache.ttl")); System.out.println(System.getProperty("networkaddress.cache.ttl")); System.out.println(Security.getProperty("networkaddress.cache.negative.ttl")); System.out.println(System.getProperty("networkaddress.cache.negative.ttl")); while(true) { int i = 0; try { makeRequest(); InetAddress inetAddress = InetAddress.getLocalHost(); System.out.println(new Date()); inetAddress = InetAddress.getByName(hostname); displayStuff(hostname, inetAddress); } catch (UnknownHostException e) { e.printStackTrace(); } try { Thread.sleep(5L*1000L); } catch(Exception ex) {} i++; } } public static void displayStuff(String whichHost, InetAddress inetAddress) { System.out.println("Which Host:" + whichHost); System.out.println("Canonical Host Name:" + inetAddress.getCanonicalHostName()); System.out.println("Host Name:" + inetAddress.getHostName()); System.out.println("Host Address:" + inetAddress.getHostAddress()); } public static void makeRequest() { try { URL url = new URL("http://"+hostname+"/"); URLConnection conn = url.openConnection(); conn.connect(); InputStream is = conn.getInputStream(); InputStreamReader ird = new InputStreamReader(is); BufferedReader rd = new BufferedReader(ird); String res; while((res = rd.readLine()) != null) { System.out.println(res); break; } rd.close(); } catch(Exception ex) { ex.printStackTrace(); } } } </code></pre>
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    1. POAny way to make Java honor the DNS Caching Timeout (TTL)?
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    1. COYes, Java 1.5 had a default value of infinite caching. Java 1.6 and 1.7 have a 30 second default.
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      1. USMichael
 

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