java - Spring Boot: External configuration results in empty value -


in project have spring boot-based library delivers me commonly used services. in spring boot project make use of library , experience problems while trying retrieve external configuration.

the library "reads" external configuration within 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 (external) properties in java representation assetserviceconfiguration.

@configuration @enableconfigurationproperties(assetserviceproperties.class) public class assetserviceconfiguration {     @bean     public assetserviceclient assetserviceclient(assetserviceproperties properties) {         return new assetserviceclient(properties.geturl());     } }

the assetserviceclient part of library exposed 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 library , configured external configuration file application.properties contains external configuration service.assets defined in 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 project uses spring boot based library 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 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 spring boot project code executes, value of service.assets null. spring boot not read value of external configuration in file application.properties. why? , how can solve run?

another hint: when trying service.assets following line of code within spring boot project

@value("${service.assets}") string url;

spring boot reads configuration , gets filled proper value.

the used spring boot version 1.5.3.release.

i appreciate help

@alfcope: yes problem. properties file needs specify configuration attribute 'service.assets.url'. in properties file there attribute 'service.assets'.

see https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-external-config.html#boot-features-external-config-typesafe-configuration-properties more details type safe configuration.

thank you


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