Autowiring and Misc Questions
Learn about a few interview questions regarding autowiring in Spring.
We'll cover the following...
- What is autowiring in Spring?
- What are the different modes of autowiring in Spring?
- How does autowiring internally work?
- What is autowiring by the constructor?
- What are the limitations of autowiring?
- Is it possible to exclude a bean from being autowired?
- What does the @Autowired annotation do?
- What happens if we specify an interface instead of a class in getBean() method?
- Why do we need a no-arg constructor?
- What is Spring Security?
What is autowiring in Spring?
Connecting beans together in the Spring container is called autowiring. It is the process by which collaborating beans are tied together without the developer having to write explicit object instantiation code.
It reduces the code as well as the development time because it removes the need to write dependency injection code.
What are the different modes of autowiring in Spring?
When using XML configuration the autowiring mode can be specified using the autowire attribute in the <bean> tag. The modes of bean autowiring are:
no: the default autowiring mode is no autowiring in which case the developer has to provide explicit bean reference using therefattribute.byName: the bean is injected by matching the property, that needs to be autowired, with a bean that has the same name. The property name must match a bean name for this type of autowiring to work.byType: the bean is injected by