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Example 7.16. Extended BeanFactory public class EnhancedBeanFactory extends GenericBeanFactory { public EnhancedBeanFactory(KernelConfigurator configurator) { super(configurator); } public Object createBean() throws Throwable { Object bean = super.createBean(); Class clazz = bean.getClass(); if (clazz.isAnnotationPresent(SetterProxy.class)) { Set interfaces = new HashSet(); addInterfaces(clazz, interfaces); return Proxy.newProxyInstance( clazz.getClassLoader(), interfaces.toArray(new Class[interfaces.size()]), new SetterInterceptor(bean) ); } else { return bean; } } protected static void addInterfaces(Class clazz, Set interfaces) { if (clazz == null) return; interfaces.addAll(Arrays.asList(clazz.getInterfaces())); addInterfaces(clazz.getSuperclass(), interfaces); } private class SetterInterceptor implements InvocationHandler { private Object target; private SetterInterceptor(Object target) { this.target = target; } public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { String methodName = method.getName(); if (methodName.startsWith("set")) throw new IllegalArgumentException("Cannot invoke setters."); return method.invoke(target, args); } } } public class PrototypeCreator { ... public void create() throws Throwable { ValueInvoker vi1 = (ValueInvoker)bfDefault.createBean(); vi1.setValue("default"); ValueInvoker vi2 = (ValueInvoker)enhanced.createBean(); vi2.setValue("enhanced"); ValueInvoker vi3 = (ValueInvoker)proxied.createBean(); try { vi3.setValue("default"); throw new Error("Should not be here."); } catch (Exception ignored) { } }