Web Reference: Jun 26, 2011 · This left whitespace, and causes the UnknownHostException as a host with whitespace is not a valid host. Doing a host = host.trim() on the String host solved the ambiguous issue. Jan 9, 2025 · Learn what causes UnknownHostException, how to prevent it, and how to handle it. 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.
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