Spring constructor injection with lots of fields

user_535060 0
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I have a Spring component that has 8 members.

I am currently autowiring these 8 members with field injection.

I now want make these members private final, and do constructor injection to set them.

This is easy enough to do, but now I have a component constructor with 8 parameters.

I know I can use setter injection and set these values in an XML file, but this I don't want to do.

Are there any other alternatives?

EDIT:

This component just does a single thing. But that involves calling several other services. Hence the 8 injections

spring java
2 Answers

Firstly, there is no alternative.
Secondly, if a contructor has 8 parameters, it is not designed properly. I think you should rethink about the class structure and responsibility. Consider splitting the class into two or three separate beans and inject those.

If a constructor has 8 arguments, in most cases it will be vioalating SRP(Single Responsibility principle)

user_65650930

First of all you can set the initial values of these parameters in an .properties file and then read this property file as a pojo configuration class and it is very easy in spring to convert .properties file into pojo.

so the constructor will be something like this

@Autowired public Temp(ConfigPojoClass config) { ..... }

user_60667560
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