From Spring Boot 2.2, it is at last possible to define an immutable class decorated with @ConfigurationProperties
.
The documentation shows an example.
You just need to declare a constructor with the fields to bind (instead of the setter way) and to add the @ConstructorBinding
annotation at the class level to indicate that constructor binding should be used.
So your actual code without any setter is now fine :
@ConstructorBinding
@ConfigurationProperties(prefix = "example")
public final class MyProps {
private final String neededProperty;
public MyProps(String neededProperty) {
this.neededProperty = neededProperty;
}
public String getNeededProperty() { .. }
}