Here is an example of a class extending ContextAwareImpl in Logback:

import ch.qos.logback.core.spi.ContextAware;
import ch.qos.logback.core.spi.ContextAwareImpl;

public class MyContextAwareImpl extends ContextAwareImpl {

    public MyContextAwareImpl() {
    }

    @Override
    public void start() {
        // additional initialization code
        super.start();
    }

    public void doSomething() {
        // logic for doing something
    }
}

This class is an example of a custom context-aware class in Logback. It extends ContextAwareImpl, which is an implementation of the ContextAware interface, which provides the ability for a class to be aware of a Context object. The Context object is set by the framework and it is not necessary to pass it in the constructor.

The start method is overridden to perform additional initialization. Additionally, a custom method doSomething is added to the class to demonstrate how a context-aware class can use the context object to perform its operations.

It is important to note that this class is extending ContextAwareImpl which provides a basic implementation of the ContextAware interface. The Context object is used to configure and obtain resources such as appenders, converters, etc. The ContextAwareImpl class provides a mechanism for subclasses to access the Context object and to be notified when the Context object is reset.