Web Reference: Jan 16, 2026 · This exception is thrown when the Java Virtual Machine (JVM) is unable to resolve the hostname to an IP address. Understanding the root causes and how to handle this exception is crucial for building robust network applications in Java. In this tutorial, we’ll learn the cause of UnknownHostExceptionwith an example. We’ll also discuss possible ways of preventing and handling the exception. java.net.UnknownHostException is a runtime networking error that indicates Java failed to resolve a hostname into an IP address. It is thrown before any TCP connection is attempted, meaning the failure happens at the DNS or name resolution layer.
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