kruttik-lab49/spring-value.md

Last active August 3, 2021 17:47

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TWL-Lab49/Spring - Injecting properties as a list with default value using value annotation

Raw

Suppose you want to inject a list of values in your bean. You can do-

#prop file
mylist=x,y,z

#bean
@Value("${myList}")
String[] myList;

But what if you want a List<String> instead of String[]. Sure, you can use the following-

#prop file
mylist=x,y,z

#bean
@Value("#{'${myList}'.split(',')}")
List<String> myList;

or event better/cleaner-

#prop file
mylist={'x','y','z'}

#bean
@Value("#{${myList}}")
List<String> myList;

But what if you want to add a default value? Here's how-

#prop file
mylist={'x','y','z'}

#bean
@Value("#{${myList:''}}")
List<String> myList;

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