I have some code in java and most of the files/functions requires retrieving values from application.properties. I'm wondering if its a good practice to store them in an entity with getters for ease of use or call them everytime I make a new file and how to possibly do it as it turns out I need to create a bean for it to work. Tried defining it in Appconfig but it showed errors.
(Disclaimer: I'm not that experienced in java)
AppConfig.java
@Configuration
public class AppConfig {
@Bean
public GlobalVariables globalVariables() {
return new GlobalVariables();
}
}
Entity with getters
@Getter
public class GlobalVariables {
@Value("${api.id}")
private String apiId;
@Value("${api.key}")
private String apiKey;
something_else...
}
@Service
@RequiredArgsConstructor
public class SomeService {
private final GlobalVariables globalVars;
...
// Example method
public String showApiKey() {
return globalVars.apiKey;
}
}
versus calling them in each service file
@Service
public class SomeService {
@Value("${api.id}")
private String apiId;
@Value("${api.key}")
private String apiKey;
...
// Example method
public String showApiKey() {
return apiKey;
}
}
ps: i have no idea why im doing this just wondering if this is actually a thing in java
The common way how to work with properties is annotation @ConfigurationProperties
Example:
@Data
@FieldDefaults(level = AccessLevel.PRIVATE)
@Validated
@Configuration
@ConfigurationProperties(prefix = "example.prefix")
public class ExampleProperties {
String prop1;
@NotNull @Min(1) @Max(365)
Integer prop2;
boolean prop3;
}
Just inject ExampleProperties and get values with getters. In your config you would have example.prefix.prop1=someValue. You can have many configuration properties beans with different prefix and you can also nest classes see https://docs.spring.io/spring-boot/docs/current/reference/html/features.html#features.external-config.typesafe-configuration-properties.java-bean-binding