public class Test<E>
 {
    public static final class Ex1 extends Exception
    {
        private static final long serialVersionUID = 1;
    }

    private void a1()
    {
        try
        {
            a1_1();
        }
        catch (Ex1 si)
        {
            assert si != null;
        }
    }

    protected Object a1_1() throws Ex1
    {
        return null;
    }

    private void a2()
    {
        try
        {
            a2_1();
        }
        catch (Ex2 si)
        {
            assert si != null;
        }
    }

    protected Object a2_1() throws Ex2
    {
        return null;
    }

    public final class Ex3 extends Exception
    {
        private static final long serialVersionUID = 1;
    }

    private void a3()
    {
        try
        {
            a3_1();
        }
        catch (Ex3 si)
        {
            assert si != null;
        }
    }

    protected Object a3_1() throws Ex3
    {
        return null;
    }

}

final class Ex2 extends Exception
{
    private static final long serialVersionUID = 1;
}