How to inject a Map using the @Value Spring Annotation?

java spring dependency-injection annotations spring-annotations
yathirigan picture yathirigan · Jun 7, 2015 · Viewed 103k times · Source

How can i inject values into a Map from the properties file using the @Value annotation in Spring ?

My Spring Java class is and i tried using the $ but, got the following error message

Could not autowire field: private java.util.Map Test.standard; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'com.test.standard' in string value "${com.test.standard}"

@ConfigurationProperty("com.hello.foo")
public class Test {

   @Value("${com.test.standard}")
   private Map<String,Pattern> standard = new LinkedHashMap<String,Pattern>

   private String enabled;

}

I have the following properties in a .properties file

com.test.standard.name1=Pattern1
com.test.standard.name2=Pattern2
com.test.standard.name3=Pattern3
com.hello.foo.enabled=true

Answer

Michael Rahenkamp picture Michael Rahenkamp · Apr 22, 2016

You can inject values into a Map from the properties file using the @Value annotation like this.

The property in the properties file.

propertyname={key1:'value1',key2:'value2',....}

In your code.

@Value("#{${propertyname}}")  private Map<String,String> propertyname;

Note the hashtag as part of the annotation.

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