default methods

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This issue is about my idea, that, I think, will be very useful.

Native API methods are often designed agains java code conventions (which is normal). A common example is:

int doSomething(ResultType *resultVariable);

where method returns an error code. Java variant of the method whould look like this:

ResultType doSomething() throws LibraryError;

So the default method feature, that appeared in Java 8, can be used to bring some comfort in your code.

interface MyNativeLibrary {
    ErrorCode doSomething(ResultType resultVariable);
    default ResultType doSomething() throws LibraryError
    {
        ResultType resultValue = new ResultType();
        ErrorCode error = doSomething (resultValue);
        if (error != ErrorCode.OK) {
            throw new LibraryError (error);
        }
        return resultValue;
    }
}

To use native interfaces like this, LibraryLoaders should ignore default methods while generating a new stub.
I understand that the library is currently targeted for jdk7+, but I hope, there is a workaround to implement this feature for jdk8+ only.

I'd like to know your opinion about this feature.

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There is PR #66 about the same feature. But PR #139 shows that test for it was written with an error and was always ignored.

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After fixing test in #139 It appeared that default methods are already ignored.