Spring: Cannot autowire a Bean which extends another Bean

Question

I'd like to write a JUnit Test for a Dao class. The dao do not need any save method as it is reading only some data.

The Test is using HSQLDB and I need to insert some test data first. As I do not want to write code only to make the test running I extend the DaoImpl class to have a save method.

Now I'd like to @Autowire the DaoTestImpl class but getting a No qualifying bean of type […] found for dependency error.

My setup in src/main looks like this:

interface Dao ...
@Repository("Dao") class DaoImpl implements Dao ...

And for the test in src/test I have the new class:

@Repository("DaoTestImpl") class DaoTestImpl extends DaoImpl

In the JUnit Test I'm using

@Autowired
@Qualifier("DaoTestImpl")
private DaoTestImpl daoTestImpl;

Is there something wrong when autowireing a Bean which extends another Bean? If the DaoTestImpl class is implementing the interface Spring will find the proper Bean. But in this case I cannot test the DaoImpl class.

score 2 · Accepted Answer · answered Feb 24 '16 at 14:30

2

You need to declare the interface as a field and add qualifier using the name of the implemented class. Then it will autowire as expected. The code will look like as bellow :

@Autowired
@Qualifier("daoTestImpl")
// The interface
private Dao dao;

answered Feb 24 '16 at 14:30

Jahangir Alam

311
2
11

Ok, this will work. But I don't understand the problem by using a concrete class? – s.meissner Feb 24 '16 at 15:21
It is mainly because spring create dynamic proxies for many reasons - This link may help to understand - http://stackoverflow.com/a/6511483/5654842 – Jahangir Alam Feb 24 '16 at 16:41
I dont understand this, "who" is going to be daoTestImpl? – jpganz18 Jul 19 '16 at 17:49

Spring: Cannot autowire a Bean which extends another Bean

1 Answers1