When the shift amount for an integer is specified as a literal (immediate) value that is greater than 31, a warning message would be desirable. For example,
"Warning: (int) << 56 is equivalent to (int) << 24.

The same applies for longs having a shift greater than 63 (or less than 0).

$ cat Rfe.java

public class Rfe {

    private byte[] buffer = new byte[] {1, 0, 0, 0, 0, 0, 0, 0};

    public static void main(String[] args) {
        Rfe rfe = new Rfe();
        System.out.println("Buggy long value: " + rfe.getLongBuggy(0));
        System.out.println("Correct long value: " + rfe.getLong(0));
    }

    public Rfe() {}

    public long getLongBuggy(int offset) {
        return ((buffer[offset] & 0xFF) << 56)
             | ((buffer[offset + 1] & 0xFF) << 48)
             | ((buffer[offset + 2] & 0xFF) << 40)
             | ((buffer[offset + 3] & 0xFF) << 32)
             | ((buffer[offset + 4] & 0xFF) << 24)
             | ((buffer[offset + 5] & 0xFF) << 16)
             | ((buffer[offset + 6] & 0xFF) << 8)
             | ((buffer[offset + 7] & 0xFF) );
    }

    public long getLong(int offset) {
        return (((long)buffer[offset] & 0xFFL) << 56)
             | (((long)buffer[offset + 1] & 0xFFL) << 48)
             | (((long)buffer[offset + 2] & 0xFFL) << 40)
             | (((long)buffer[offset + 3] & 0xFFL) << 32)
             | (((long)buffer[offset + 4] & 0xFFL) << 24)
             | (((long)buffer[offset + 5] & 0xFFL) << 16)
             | (((long)buffer[offset + 6] & 0xFFL) << 8)
             | (((long)buffer[offset + 7] & 0xFFL) );
    }

}