I want to define a Spring Bean CLASS with NO Interface

Question

I have a spring bean that extends HibernateDaoSupport. I want this bean injected into my Controllers, but I do NOT want it to implement any interface. I just want to refer to the concrete class from within the rest of my code (not use the AopProxy perhaps?) Does anyone have a way of doing this?

<bean id="mySampleService" class="com.sample.MySampleService">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

@Autowired
private MySampleService mySampleService;

... getters and setters ....

I know it's a good idea to use the interface and that's the whole point of IoC, but PLEASE DON'T suggest I use the interface.

Answer 1

If class to be proxied (by transactional proxy in your case) implements any interface (InitializingBean implemented by HibernateDaoSupport in your case), Spring by default uses proxying strategy based on JDK dynamic proxies.

So, it creates a proxy of type InitializingBean, that, obviously, cannot be injected into a field of type MySampleService.

If you don't want to use interface you can override the strategy used by transactional aspect by declaring <tx:annotation-driven> with proxy-target-class = "true".

See also:

• 7.6 Proxying mechanisms