How to Inject Properties into Spring Beans Annotated with @Repository?

Injecting Properties into Spring Beans via Annotations

When dealing with Spring beans that are detected via annotations, injecting property values from external sources can be a challenge. This article explores a solution to this problem by utilizing EL support in Spring 3.

The original issue arose due to beans being annotated with @Repository, eliminating the option of explicitly configuring them in the Spring XML file. However, to inject a property value, a typical approach using the bean's XML configuration would not be feasible.

The solution lies in leveraging the @Value annotation in Spring 3, which allows developers to inject property values directly into fields or setter methods. The syntax for this is:

@Value("#{systemProperties.databaseName}")
public void setDatabaseName(String dbName) { ... }

The systemProperties object is an implicit object, and the databaseName property can be accessed within the setter method.

Furthermore, it is possible to inject properties from Properties objects using @Value:

@Value("#{myProperties['github.oauth.clientId']}")
private String githubOauthClientId;

This method provides a flexible way to inject external property values into Spring beans. For more detailed information, refer to the blog post provided in the original answer.

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