Something like this:

String[] foo = (String[]) java.lang.reflect.Array.newInstance(String[].class.getComponentType(), 1);

... is emitted by javac as:

        11: iconst_1
        12: invokestatic #8 // Method java/lang/reflect/Array.newInstance:(Ljava/lang/Class;I)Ljava/lang/Object;
        15: checkcast #6 // class "[Ljava/lang/String;"
        18: checkcast #6 // class "[Ljava/lang/String;"
        21: astore_1

I expect to see only one checkcast here.

Related(?) issue in java.util.Arrays.deepHashCode, where something like

            if (element instanceof Object[])
                elementHash = deepHashCode((Object[]) element);

appears to be translated to:

        33: instanceof #54 // class "[Ljava/lang/Object;"
        36: ifeq 55
        39: aload 5
        41: checkcast #54 // class "[Ljava/lang/Object;"
        44: checkcast #54 // class "[Ljava/lang/Object;"
        47: invokestatic #106 // Method deepHashCode:([Ljava/lang/Object;)I
        50: istore 6
        52: goto 259

Duplicate checkcast, and perhaps these are both unnecessary due the preceding instanceof