jodd-proxetta/src/main/java/jodd/proxetta/impl/WrapperProxettaFactory.java
public WrapperProxettaFactory setTargetInterface(final Class targetInterface) {
		if (!targetInterface.isInterface()) {
			throw new ProxettaException("Not an interface: " + targetInterface.getName());
		}
		this.targetInterface = targetInterface;
		return this;
	}
public WrapperProxettaFactory setTargetInterface(final Class targetInterface) {
		if (!targetInterface.isInterface()) {
			throw new ProxettaException("Not an interface: " + targetInterface.getName());
		}
		this.targetInterface = targetInterface;
		return this;
	}
Defines the interface of the resulting class.