A constant field produced this code in an inner class:

public class MDIncRefresh implements MessageFlyweight
{
..
public class MDEntries implements GroupFlyweight
{
...
private static final byte[] TradingSessionIDValue = {65};

    public int TradingSessionIDLength()
    {
        return 1;
    }

    public byte TradingSessionID(final int index)
    {
        return TradingSessionIDValue[index];
    }

This is the error on the constant declaration:

The field TradingSessionIDValue cannot be declared static; static fields can only be declared in static or top level types MDIncRefresh.java /InteropTester/src/MarketData line 434 Java Problem