Spring bean instantiation by passing constructor args?

Question

I have below spring bean. ``` public class Employee2 { private int id; private String name; private double salary; public Employee2(int id, String name, double salary) { this.id = id; this.name = name; this.salary = salary; } // some logic to call database using above values } ``` Now i have below config in spring configuration file. ```

``` Now i cannot hard code the values in above config since they are dynamic. Now i am getting spring bean programmatically using below code. The bean scope is singelton. ``` Employee2 emp = (Employee2)applicationContext.getBean("emp2"); ``` Now how can i pass the values to Employee2 constructor? Thanks!

Accepted Answer

You can use the ApplicationContext#getBean(String name, Object ... params) method, which

Allows for specifying explicit constructor arguments / factory method arguments, overriding the specified default arguments (if any) in the bean definition.

For example:

```
Integer param1 = 2;
String param2 = "test";
Double param3 = 3.4;
Employee2 emp = 
          (Employee2)applicationContext.getBean("emp2", param1, param2, param3);
```

Anyway, while this will possibly work, you should consider using Spring EL, as noted in one of the comments under the question.

Spring bean instantiation by passing constructor args?

Solution

Problem