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I am trying to data from a server. Sometimes my code fails due to an UnknownHostException. Why is that? What is the cause of this problem?
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UnknownHostException is a common error message in Java applications. This error typically indicates that there was a DNS resolution failure. If a Java application fails to get a valid DNS answer, then it might throw an UnknownHostException error.
The UnknownHostException can be avoided with the following checks: Valid hostname - The hostname should be double checked to make sure it does not contain any typos or whitespaces. DNS settings - The system DNS settings should be checked to ensure that the DNS server is reachable.
A few tips to prevent the exception are: Double-check the hostname: Make sure there is no typo, and trim all whitespaces. Check the system's DNS settings: Make sure the DNS server is up and reachable, and if the hostname is new, wait for the DNS server to catch up.
This may occur if a hiccup in DNS server has occurred. Apart from making the DNS server more robust or looking for another one, you can also just use the full IP address instead of the hostname. This way it doesn't need to lookup the IP address based on the hostname. However, I would rather fix the DNS issue and prefer the DNS since IP addresses may change from time to time.
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An UnknownHostException indicates the host specified couldn't be translated to an IP address. It could very well be a problem with your DNS server.
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