# Initialize the library

To use the library and create custom inventories, it first must be initialized by defining a set of reusable Java objects. This is done by using the `CraftVentoryLibrary` class that provides several methods to use the default behaviors implemented in the library.

### Create an InventoryService

An `InventoryService` is a class with two purposes:

* Register, store and retrieve [inventory providers](/craftventory/get-started/declare-an-inventory.md)
* Store information about players with an opened inventory and manage inventories' life cycle

An instance of this class with the default behavior provided by the library can be created by using the following code:

```java
InventoryService service = CraftVentoryLibrary.createInventoryService(Plugin plugin);
```

> Note: We recommand to store this object as an instance variable in the main class of your plugin (eq. the class that extends `JavaPlugin`).

### Create an InventoryConfigDAO

An `InventoryConfigDAO` is a class used to load an inventory from a configuration file. By default, the library provides an instance of this class to load inventories from **YAML** files. The following code uses the library built-in methods to create a new instance of `InventoryConfigDAO`:

```java
// Factory used to load item click actions.
ClickActionLoaderFactory<ConfigurationSection> factory =
        FastInventoryLibrary.createDefaultClickActionLoaderFactory();

InventoryConfigDAO dao = FastInventoryLibrary.createDefaultConfigDAO(factory);
```

> Note: `ClickActionLoaderFactory` is a class that is used to load item actions from the configuration file.

### Example

Here is a complete example:

```java
public class CraftVentoryPlugin extends JavaPlugin {

    private InventoryService inventoryService;

    @Override
    public void onEnable() {
        this.inventoryService = CraftVentoryLibrary.createInventoryService(this);
        this.loadInventoryProviders();
    }

    private void loadInventoryProviders() {

        ClickActionLoaderFactory<ConfigurationSection> factory =
                FastInventoryLibrary.createDefaultClickActionLoaderFactory();

        InventoryConfigDAO dao = FastInventoryLibrary.createDefaultConfigDAO(factory);

        // Register inventory providers here.
    }
}
```


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