public void onEnable()
{
    getServer().getPluginManager().registerEvents(this, this);
}

@EventHandler
public void onEntityBlockForm(EntityBlockFormEvent event)
{
    if (event.getEntity() instanceof Player)
    {
        if (event.getBlock().getType().equals(Material.FROSTED_ICE))
        {
            System.out.println("Success!");
        }
    }
}