无法解析值“${spring.datasource.dataSourceClassName}”中的占位符 'spring.datasource.dataSourceClassName'

Question

我使用 Spring 2.6.5，配置如下 Gradle：

dependencies {    
    .......
    implementation 'org.postgresql:postgresql'
}

yml 配置：

spring:
  application:
    name: simulator
  profiles:
    active: dev
  datasource:
    jdbc-url: jdbc:postgresql://localhost:5432/simulator
#    dataSourceClassName: javax.sql.DataSource
    connectionTimeout: 5000
    maxLifetime: 5000
    maximumPoolSize: 5000
    driverClassName: org.postgresql.Driver
    username: admin
    password: admi
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
    database: postgresql
  sql:
    init:
      platform: org.hibernate.dialect.PostgreSQL95Dialect

但是我在启动时遇到错误：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'test.repository.DatabaseConfiguration': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'spring.datasource.dataSourceClassName' in value "${spring.datasource.dataSourceClassName}"
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:405)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean[=14=](AbstractBeanFactory.java:335)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:410)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean(AbstractBeanFactory.java:374)
    at org.springframework.cloud.context.scope.GenericScope$BeanLifecycleWrapper.getBean(GenericScope.java:376)
    at org.springframework.cloud.context.scope.GenericScope.get(GenericScope.java:179)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:371)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
    at org.springframework.aop.target.SimpleBeanTargetSource.getTarget(SimpleBeanTargetSource.java:35)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:195)
    at com.sun.proxy.$Proxy142.getConnection(Unknown Source)
    at liquibase.integration.spring.SpringLiquibase.afterPropertiesSet(SpringLiquibase.java:266)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1863)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1800)
    ... 85 common frames omitted
Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'spring.datasource.dataSourceClassName' in value "${spring.datasource.dataSourceClassName}"
    at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:180)
    at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126)
    at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:239)
    at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210)
    at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties[=14=](PropertySourcesPlaceholderConfigurer.java:191)
    at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:936)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1330)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1309)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:656)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
    ... 108 common frames omitted

你知道我该如何解决这个问题吗？

Answer 1

看到异常

Caused by: org.springframework.beans.factory.BeanCreationException: 

Error creating bean with name 'test.repository.DatabaseConfiguration':

 Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException:

 Could not resolve placeholder 'spring.datasource.dataSourceClassName' in value "${spring.datasource.dataSourceClassName}"

你好像有一个 class test.repository.DatabaseConfiguration 它有类似 @Value("${spring.datasource.dataSourceClassName}") 的东西，你没有在你的 properties/yml 文件中定义它或者被注释掉了

无法解析值“${spring.datasource.dataSourceClassName}”中的占位符 'spring.datasource.dataSourceClassName'

Could not resolve placeholder 'spring.datasource.dataSourceClassName' in value "${spring.datasource.dataSourceClassName}"

spring

spring-data-jpa

spring-boot