in my project I have a Spring Boot-based library that delivers me some commonly used services. In a Spring Boot project I make use of the library and do experience some problems while trying to retrieve some external configuration.
The library "reads" some external configuration within the AssetServiceProperties.
@ConfigurationProperties("service.assets")
public class AssetServiceProperties {
private String url;
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
}
This class offers those (external) properties in Java representation for the AssetServiceConfiguration.
@Configuration
@EnableConfigurationProperties(AssetServiceProperties.class)
public class AssetServiceConfiguration {
@Bean
public AssetServiceClient assetServiceClient(AssetServiceProperties properties) {
return new AssetServiceClient(properties.getUrl());
}
}
The AssetServiceClient is the part of the library that is exposed for clients.
public class AssetServiceClient {
private String url;
private RestTemplate restTemplate;
public static final String CONTROLLER = "assets";
public AssetServiceClient(String url) {
this.url = url;
restTemplate = new RestTemplate();
}
public AssetsResponse getByService(String service) {
UriComponentsBuilder builder = UriComponentsBuilder.
fromUriString(url).
pathSegment(CONTROLLER).
queryParam("service", service);
return restTemplate.getForObject(builder.build().encode().toUri(), AssetsResponse.class);
}
}
The Spring Boot project imports the library and is configured with an external configuration file application.properties that contains the external configuration service.assets that is defined in the imported library.
@SpringBootApplication
@EntityScan(basePackageClasses = { Application.class, Jsr310JpaConverters.class })
@Import({AssetServiceConfiguration.class})
@PropertySource(value="classpath:internal.properties")
@PropertySource(value="file:${application.properties}")
public class Application extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(Application.class);
}
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
The relevant part of the project that uses the Spring Boot based library is my AssetController.
@RestController
@RequestMapping(value = "/assets")
public class AssetController {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
private AssetServiceClient assetServiceClient;
private AssetResourceAssembler assetResourceAssembler;
@Autowired
public AssetController(
AssetServiceClient assetServiceClient,
AssetResourceAssembler assetResourceAssembler) {
Assert.notNull(assetServiceClient, "assetServiceClient cannot be null");
this.assetServiceClient = assetServiceClient;
this.assetResourceAssembler = assetResourceAssembler;
}
@GetMapping(produces = {MediaType.APPLICATION_JSON_VALUE, MediaTypes.HAL_JSON_VALUE})
public ResponseEntity<Resources<AssetResource>> getAll() {
AssetsResponse assets = assetServiceClient.getByService("tasks");
return ResponseEntity.ok(assetResourceAssembler.toResourceList(assets.getContent()));
}
}
The problem definition : When the Spring Boot project code executes, the value of service.assets is null. Spring Boot does not read the value of the external configuration in the file application.properties . Why? And how can I solve it to get it run?
Another hint: when trying to get the service.assets with the following line of code from within the Spring Boot project
@Value("${service.assets}")
String url;
Spring Boot reads the configuration and gets it filled with a proper value.
The used Spring Boot Version is 1.5.3.RELEASE.
I appreciate any help
@alfcope: Yes that was exactly my problem. The properties file needs to specify the configuration attribute 'service.assets.url'. In my properties file there only was the attribute 'service.assets'.
See also https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-external-config.html#boot-features-external-config-typesafe-configuration-properties for more details about type safe configuration.
Thank you
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