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Editorial Team
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Asked: 2026-05-13T22:03:28+00:00

I have this Spring config: <bean id=boo class=com.x.TheClass/> The class TheClass implements TheInterface .

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I have this Spring config:

<bean id="boo" class="com.x.TheClass"/>

The class TheClass implements TheInterface. Then I have this (hypothetical) Java code: 

@Autowired
TheInterface x;

@Autowired
TheClass y;

The autowiring of TheInterface works but the autowiring of TheClass fails. Spring gives me a NoSuchBeanDefinitionException for the class.

Why can you wire the interface and not the class?

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1 Answer

  1. Editorial Team

    Normally, both will work, you can autowire interfaces or classes.

    There’s probably an autoproxy generator somewhere in your context, which is wrapping your boo bean in a generated proxy object. This proxy object will implement TheInterface, but will not be a TheClass. When using autoproxies, you need to program to the interface, not the implementation.

    The likely candidate is transactional proxies – are you using Spring transactions, using AspectJ or @Transactional?

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