Get bean with dynamic constructor arguments

Question

I have a spring component that has an @Autowired constructor that takes its arguments from @Value annotations. Like this:

@Component
public class MyImplClass implement MyInterface
...
public MyImplClass(@Value("${prop.name}") final String name, @Value("${prop.value}") final String value) {
...
}
...

in another class i autowire this type like so

@Autowired
protected MyInterface _myInterface;

now I need to get the MyInterface bean with dynamically generated values (generated in runtime) passed to the constructor. I tried to use an AbstractBeanFactory but this didn't work. How do i do this?

mzc mzc · Accepted Answer · 2015-08-27T15:07:48

You could produce a bean in your Spring config like this:

@Bean
public MyInterface getMyInterfaceBean() {
    // Calculate arg values
    String arg1 = ...;
    String arg2 = ...;
    return new MyImplClass(arg1, arg2);
}

Even better solution would be to change the constructor of MyImplClass to receive a configuration object which will know how to load the required values.

Get bean with dynamic constructor arguments

1 Answers