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This would raise the true nightmare. A type variable is a different beast than the actual type of a concrete instance. 
A type variable could resolve to a, e.g. ? extends Comparator<? super Number> to name one (rather simple) example. 
Providing the necessary meta information would imply that not only object allocation becomes much more expensive, 
every single method invocation could impose these additional cost, to an even bigger extend as we are now not only 
talking about the combination of generic classes with actual classes, but also every possible wildcarded combination, 
even of nested generic types.

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package java.util;

public final class Optional<T> {
    public<U> Optional<U> map(Function<? super T, ? extends U> mapper) {
        Objects.requireNonNull(mapper);
        if (!isPresent())
            return empty();
        else {
            return Optional.ofNullable(mapper.apply(value));
        }
    }
}

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package java.nio.file;

public final class Files {
    /**
     * Convert a Closeable to a Runnable by converting checked IOException
     * to UncheckedIOException
     */
    private static Runnable asUncheckedRunnable(Closeable c) {
        return () -> {
            try {
                c.close();
            } catch (IOException e) {
                throw new UncheckedIOException(e);
            }
        };
    }
}

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var io = java.io
var BufferedReader = io.BufferedReader
var BufferedWriter = io.BufferedWriter
var InputStreamReader = io.InputStreamReader
var OutputStreamWriter = io.OutputStreamWriter

var Socket = java.net.Socket
var socket = new Socket("localhost", 5050)
var input = new BufferedReader(new InputStreamReader(socket.getInputStream()))
var output = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));

while(true){
  var data = input.readLine()
  console.log(data)
}

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final class Point {
    public final int x;
    public final int y;

    public Point(int x, int y) {
        this.x = x;
        this.y = y;
    }

    // state-based implementations of equals, hashCode, toString
    // nothing else

}

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[code]
            lengthMapping.put("pt", Float.valueOf(1f));
            // Not sure about 1.3, determined by experiementation.
            lengthMapping.put("px", Float.valueOf(1.3f));
            lengthMapping.put("mm", Float.valueOf(2.83464f));
            lengthMapping.put("cm", Float.valueOf(28.3464f));
            lengthMapping.put("pc", Float.valueOf(12f));
            lengthMapping.put("in", Float.valueOf(72f));
[/code]

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public static <T> Comparator<T> reverseOrder(Comparator<T> cmp) {
    if (cmp == null)
        return reverseOrder();

    if (cmp instanceof ReverseComparator2)
        return ((ReverseComparator2<T>)cmp).cmp;

    return new ReverseComparator2<>(cmp);
}

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/**
     * Change the zoom level to the specified value. Specify 0.0 to reset the
     * zoom level.
     *
     * @param zoomLevel The zoom level to be set.
     */
    public void setZoomLevel(double zoomLevel);

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public void startLoginService(User paramUser) {
    if (paramUser != null) {
        Intent intent = new Intent((Context)this, LoginService.class);
        intent.putExtra("LOGIN_KEY", paramUser.getLogin());
        intent.putExtra("PASSWORD_KEY", String.valueOf(paramUser.getId()));
        startService(intent);
    }
}

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public static UUID fromString(String name) {
        String[] components = name.split("-");
        if (components.length != 5)
            throw new IllegalArgumentException("Invalid UUID string: "+name);
        for (int i=0; i<5; i++)
            components[i] = "0x"+components[i];

        long mostSigBits = Long.decode(components[0]).longValue();
        mostSigBits <<= 16;
        mostSigBits |= Long.decode(components[1]).longValue();
        mostSigBits <<= 16;
        mostSigBits |= Long.decode(components[2]).longValue();

        long leastSigBits = Long.decode(components[3]).longValue();
        leastSigBits <<= 48;
        leastSigBits |= Long.decode(components[4]).longValue();

        return new UUID(mostSigBits, leastSigBits);
    }