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Asked: 2026-05-23T01:14:09+00:00

I’m doing some work using the JavaMail API, and I’ve run across encodings which

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I’m doing some work using the JavaMail API, and I’ve run across encodings which Java doesn’t support natively (by design), such as UTF7/unicode-1-1-utf-7. For that encoding in particular I found the JUTF7 implementation of a Java Charset and CharsetProvider for UTF7. However, having added the jutf7.jar to my classpath I still get UnsupportedEncodingExceptions, and unicode-1-1-utf-7 is definitely one of JUTF7’s aliases.

Is there a way to manually load the Charset or ensure that the Charset is being loaded so that I can rule that out as a cause?

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1 Answer

  1. Editorial Team

    There’s a bit more to using a new Charset, apart from putting the necessary classes into the classpath. To quote the Javadocs:

    A charset provider identifies itself
    with a provider-configuration file
    named
    java.nio.charset.spi.CharsetProvider
    in the resource directory
    META-INF/services. The file should
    contain a list of fully-qualified
    concrete charset-provider class names,
    one per line. […]

    ( http://download.oracle.com/javase/6/docs/api/java/nio/charset/spi/CharsetProvider.html )

    Is this special file present in the JAR?

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