Error using new jvm 1.5 features

Debugging in linux these two bits of code I keep getting an exception...

    // Require jvm >= 1.5
    Charset defaultCharset = Charset.defaultCharset();

    Exception thrown: NoSuchMethodError: "java.nio.charset.Charset.defaultCharset()Ljava/nio/charset/Charset;"



    // Require jvm >= 1.5
    // Launched from a services monitor ? (e.g. from xinetd)
    Channel channel = SelectorProvider.provider().inheritedChannel();

    Exception thrown: NoSuchMethodError: "java.nio.channels.spi.SelectorProvider.inheritedChannel()Ljava/nio/channels/Channel;"

In a normal run, without debugging/jswat, no problem.

Any ideas ?

Thanks in advance

p.s. also thanks for jswat

Lucio