SpringBoot @Value annotation use

Question

I have been working on a scenario wherein I want to decrypt an entry in the application.yml .The value I want to encrypt, keep in yml file and then decrypt while the module comes up

@Value("${app.datasource.password}")
private String password;

I was trying to figure out how @Value works internally so that I could modify it to include this feature. If there is other way possible say by introducing custom annotation and AnnotationProcessor, it would also help.

Praneeth Ramesh · Accepted Answer · 2017-05-23 13:28:01Z

3

@Value Annotation just takes a Spring SPEL expression and evaluates it to set the result value for the annotated field.

For your use case you can write a Decrypter object and write a method to decrypt your data and use it as below.

@Value("#{passwordDecrypter.decrypt()}")
private String password;

Write a Bean for doing decryption

@Component
public class PasswordDecrypter{

    @Value("${app.datasource.password}")
    private String password; 

    public String decrypt(){
        // Return decrypted value
    }

}

answered May 23, 2017 at 13:28

Praneeth Ramesh

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2 Comments

chinmay55 Over a year ago

This helps. However, is there a simple annotation based approach which doesn't necessarily use @Value or other Spring annotations so that I can extend this solution to simple java programs

Praneeth Ramesh Over a year ago

You can try this. github.com/ulisesbocchio/jasypt-spring-boot But remember that this is not provided from Spring.

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