# Guide to OpenIG
Chapter 12. Customizing OpenIG

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## 12.4. Heap Object Configuration

Objects are added to the heap and supplied with configuration artifacts at initialization time. To be integrated with the configuration, a class must have an accompanying implementation of the Heaplet interface. The easiest and most common way of exposing the heaplet is to extend the NestedHeaplet class in a nested class in the class you want to create and initialize and implementing its create method.

Within the `create` method, you can access the object's configuration through the config field.