无法从ApplicationRunner中的application.yml获取值

时间：2019-05-22 14:15:44

标签： spring-boot

我已经在与Spring Boot应用程序（主）类相同的包中添加了微小的初始化类。 （我想在所有表由Hibernate的spring.jpa.hibernate.ddl-auto属性创建后执行一些数据库初始化。）但是初始化类未填充application.yml中的属性。

初始化类： 

@Component
public class LocalInitializer implements ApplicationRunner {
    @Value("${local.initialize}")
    private String[] localInitialize;

    @Override
    public void run(ApplicationArguments args) throws Exception {
        System.out.println(Arrays.toString(localInitialize));
    }
}

application.yml： 

local.initialize:
  - test-string1
  - test-string2

错误： 

...
Hibernate: drop table if exists t_worker cascade
Hibernate: drop sequence if exists hibernate_sequence
2019-05-22 17:06:45.530  INFO 16680 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown initiated...
2019-05-22 17:06:45.541  INFO 16680 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown completed.
2019-05-22 17:06:45.542  INFO 16680 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2019-05-22 17:06:45.579  INFO 16680 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-05-22 17:06:45.600 ERROR 16680 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'localInitializer': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'local.initialize' in value "${local.initialize}"
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:376) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1336) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:572) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:759) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:548) ~[spring-context-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.6.RELEASE.jar:2.0.6.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) [spring-boot-2.0.6.RELEASE.jar:2.0.6.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:386) [spring-boot-2.0.6.RELEASE.jar:2.0.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-2.0.6.RELEASE.jar:2.0.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1242) [spring-boot-2.0.6.RELEASE.jar:2.0.6.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1230) [spring-boot-2.0.6.RELEASE.jar:2.0.6.RELEASE]
    at ua.aval.cards.dictionary.CardsDictionaryApp.main(CardsDictionaryApp.java:17) [classes/:na]
Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'local.initialize' in value "${local.initialize}"
    at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:172) ~[spring-core-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124) ~[spring-core-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:237) ~[spring-core-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:211) ~[spring-core-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:175) ~[spring-context-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:839) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1083) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1062) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:581) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:370) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
    ... 17 common frames omitted

Disconnected from the target VM, address: '127.0.0.1:55405', transport: 'socket'

Process finished with exit code 1

1 个答案:

答案 0 :(得分：0)

local.initialize:
  test-string1, 
  test-string2

应该工作。注意：使用'，'并省略'-'char

备注：

使用类似ConfigurationProperties组件时

@Component
@ConfigurationProperties(prefix = "myprops")
public class MyProperties {

  private String[] initialize;

  public String[] getInitialize() {
    return initialize;
  }

  public void setInitialize(String[] initialize) {
    this.initialize = initialize;
  }
}

然后这有效

@Component
public class LocalInitializer implements CommandLineRunner{
  private final MyProperties myprops;

  @Value("${local.initialize:failed}")
  private String[] localInitialize;



  public LocalInitializer(MyProperties myprops) {
    this.myprops = myprops;
  }

  @Override
  public void run(String... args) throws Exception {
    System.out.println(Arrays.toString(localInitialize));
    System.out.println(Arrays.toString(myprops.getInitialize()));
  }

}

与application.yaml组合

local.initialize:
  test-string1, 
  test-string2

myprops:
  initialize:
  - this is
  - a bit
  - strange

打印出

[test-string1, test-string2]
[this is, a bit, strange]
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