Spring Bean entry with Same Alias - one Child another Parent class

Question

I have a requirement to Override a default service class with same Alias in SPRING bean.So that new service class is called with same Alias . I added the below code in Spring xml, here "CustomDefaultService extends DefaultService"

1) Does Spring give precedence to the child class in creating instance and referring via same alias name ?

2) Or its random for Spring if we have Child or parent to assign to same alias name?

<alias alias="modelService" name="customMefaultService" />
    <bean id="customMefaultService" class="com.tisl.CustomDefaultService" parent="defaultModelService">
</bean>

Answer 1

Which bean is actually used depends on the context loading order. Spring will use the last bean created . So if you can ensure that the customMefaultService is created after the DefaultService .

To ensure the order you could use the depends-on . Eg:

<alias alias="modelService" name="customMefaultService" />
    <bean id="customMefaultService" class="com.tisl.CustomDefaultService" parent="defaultModelService" depends-on="defaultModelService">
</bean>

As you are already using parent I would assume that the order is already correct anyway.

Also make sure that setAllowBeanDefinitionOverriding is set to true (should be as true is the default)