Whenever I start our Apache Felix (OSGi) based application under SUN Java ( build 1.6.0_10-rc2-b32 and other 1.6.x builds) I see the following message output on the console (usually under Ubuntu 8.4):
Warning: The encoding ‘UTF-8’ is not supported by the Java runtime.
I’ve seen this message display occasionally when running both Tomcat and Resin as well. If java supports unicode and UTF-8, what causes this message? I’ve yet to find any reference, or answer to this anywhere else.
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Answer
According the documentation “Every implementation of the Java platform is required to support the following standard charsets… US-ASCII, ISO-8859-1, UTF-8, UTF-16BE, UTF-16LE, UTF-16.” So I doubt that Sun have released a build without UTF-8 support.
The actual error message appears to be from here, which is part of the Xerces XML parser. I imagine it is the XML parser where the problem is occurring.