How to configure host name resolution to use a custom host resolver that works in Java 8 and later?

Question

According to this post there are several ways to configure a custom host resolver in Java, but each of these ways differs from the other and does not work for all java versions between 8 and the most recent.

The post indicated above is 10 years old: does anyone know if in this period a solution has been found that works for all the java versions mentioned above? If so, does anyone have an example code?

Java invokes the host operating system to resolve dns; why would there be a specific Java DNS resolver by default? The only option I know of would be running your own Java DNS. Which is probably not what you want. Why do you want to do this? — Elliott Frisch
– Elliott Frisch, Commented Oct 29, 2022 at 8:16
I was interested in it for educational purposes. How can I run my Java DNS which works for java version 8 and later? Could you provide a sample code? — Edgar Becker
– Edgar Becker, Commented Oct 29, 2022 at 8:22
No one is going to provide "sample code", because no one is doing this. dnsjava is a dns server written in Java. You can run any dns server you like, Unbound for example, then you must configure your operating system to use it. Note: This is still not something Java (as a platform) is designed for. Why would there be a "resolve dns names" in an atypical manner? — Elliott Frisch
– Elliott Frisch, Commented Oct 29, 2022 at 8:31
Rather than starting a server I was wondering if there was a solution similar to this but also working for Java 8. If we could do the same programmatically it would be even better instead of passing a parameter to the JDK. — Edgar Becker
– Edgar Becker, Commented Oct 29, 2022 at 8:42

Edgar Becker · Accepted Answer · 2022-11-02 10:44:20Z

3

After a deep search I found this example that uses the burningwave tools library:

Map<String, String> hostAliases = new LinkedHashMap<>();
hostAliases.put("my.hostname.one", "123.123.123.123");

HostResolutionRequestInterceptor.INSTANCE.install(
    new MappedHostResolver(hostAliases),
    DefaultHostResolver.INSTANCE
);

InetAddress inetAddress = InetAddress.getByName("my.hostname.one");

And here the code to add a DNS server connection based host resolver

edited Nov 2, 2022 at 10:44

answered Oct 30, 2022 at 6:02

Edgar Becker

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