sun.net.inetaddr.ttl Java System Property

Other Networking Properties

Here are some other networking Java properties:

• http.agent
• http.keepAlive
• http.maxConnections
• https.protocols
• java.net.preferIPv4Stack
• java.net.preferIPv6Addresses
• java.net.useSystemProxies
• javax.net.debug
• javax.net.ssl.trustStore
• jdk.net.hosts.file
• jdk.tls.client.protocols
• jdk.tls.disabledAlgorithms
• networkaddress.cache.negative.ttl
• networkaddress.cache.ttl
• sun.net.client.defaultConnectTimeout
• sun.net.client.defaultReadTimeout

Supported Since

Java has supported the sun.net.inetaddr.ttl system property since at least version 6, support may go back to even older versions of java.

Setting sun.net.inetaddr.ttl on Startup

You can set the sun.net.inetaddr.ttl java system property during startup of the java runtime using the -D command line argument:

java -Dsun.net.inetaddr.ttl=value MyAppMain

You may also be able to specify sun.net.inetaddr.ttl via the JAVA_TOOL_OPTIONS environment variable:

JAVA_TOOL_OPTIONS=-Dsun.net.inetaddr.ttl=value

Setting / Reading sun.net.inetaddr.ttl at Runtime

You can set sun.net.inetaddr.ttl at runtime with the following Java code:

System.setProperty("sun.net.inetaddr.ttl", "value");

WARNING: Depending on the property and JVM version using setProperty may or may not work if the JDK Java class that uses this variable has already been loaded. The value of the sun.net.inetaddr.ttl system property may be cached within an internal private static variable of the implementing class.

To read the value of sun.net.inetaddr.ttl at runtime, you can use this Java code:

String propertyValue = System.getProperty("sun.net.inetaddr.ttl");
if (propertyValue != null) {
    System.out.println("sun.net.inetaddr.ttl = " + propertyValue);
} else {
    System.out.println("sun.net.inetaddr.ttl was null");
}