public static Inventory getInventory(Block containerBlock) {
    BlockState state = containerBlock.getState();
    assert state instanceof Container;
    Container container = (Container) state;
    // Note: For double chests this returns the complete double chest inventory.
    Log.debug("Container type: " + container.getClass().getName()
        + " Inventory type: " + container.getInventory().getClass().getName()
        + " Inventory size: " + container.getInventory().getSize());
     return container.getInventory(); // Not null
}