Question

I use mockito as a mock object library. I am unit testing DAOs.

DAOs expect JdbcTemplate to be injected through @Autowired. Hence, there are no setter methods for JDBC Template in DAOs which unit tests can call.

I have the following test spring application context:

<b:beans 
    xmlns:b="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p" 
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:util="http://www.springframework.org/schema/util"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context-3.0.xsd
         http://www.springframework.org/schema/util
         http://www.springframework.org/schema/util/spring-util-3.0.xsd">

    <context:annotation-config />

    <b:bean id="mockito" class="org.mockito.Mockito" />
    <b:bean 
        id="mockJdbcTemplate"
        factory-bean="mockito"
        factory-method="mock">
        <b:constructor-arg value="org.springframework.jdbc.core.JdbcTemplate"/>
    </b:bean>
</b:beans>

I was expecting that at test execution time, spring will create mock jdbctemplate instance and autowire it to DAO.

But that doesn’t happen – instead I just get the following exception:

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [org.springframework.jdbc.core.JdbcTemplate] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:920)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:789)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:703)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:474)
    ... 42 more

Has anyone had success with this approach before?

Thanks.

Answer 1

I think the problem is that the factory method mock which returns generic type. After erasure, the spring is not able to deduct object type, try to provide explicit object type by class attribute.

public MockitoMockFactoryBean implements FactoryBean<?>
{
    private Class<?> objectType;

    @Override public Object getObject()
    {
        return Mockito.mock(objectType);
    }
    public void setObjectType(Class<?> objectType)
    {
        this.objectType=objectType;
    }
    @Override public Class<?> getObjectType()
    {
        return objectType;
    }
}