enum.valueOf(Ljava/lang/String;) appears as undefined in Eclipse plugin

Hello,
I'm trying to return an enum value from a JSNI method like in the
example below:

public final native MyEnum getEnum() /*-{
return @my.classpath.MyEnum::valueOf(Ljava/lang/String;)
(this.myString);
}-*/;

The GWT Eclipse plugin marks the return line with the following error:
The method valueOf(java.lang.String) in the type MyEnum is undefined

However, when I try to lunch the application, it runs just fine. Am I
doing something deprecated or is it a bug in the GWT plugin?
Anyone knows a workaround?

Thanks,
Nicola

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