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java - Spring没有读取属性文件

问题描述

我在这上面花了几个小时。我无法使用我的属性文件正确插值我的变量。我有一个属性文件，无法正确插值。我试过明确指定文件，使用外部配置和 jar 内的配置无济于事。

在此处输入图像描述

用法

@Component
public class TeradataConnector {
    @Value("${jdbcurl}")
    private String teradataConnection;

    @Value("${jdbctable}")
    private String teradataTable;

错误

Jan 05, 2021 6:10:15 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-nio-8080"]
Jan 05, 2021 6:10:15 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service [Tomcat]
Jan 05, 2021 6:10:15 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet engine: [Apache Tomcat/9.0.34]
Jan 05, 2021 6:10:15 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring embedded WebApplicationContext
Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'teradataConnector': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'jdbcurl' in value "${jdbcurl}"
Jan 05, 2021 6:10:16 PM org.apache.catalina.core.StandardService stopInternal
INFO: Stopping service [Tomcat]
WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance.
Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'teradataConnector': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'jdbcurl' in value "${jdbcurl}"
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:405) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1422) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:895) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at com.company.nap.cyclic.App.main(App.java:11) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'jdbcurl' in value "${jdbcurl}"
    at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:178) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:236) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:175) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:912) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1247) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1226) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[cyclic-feature-cyclic_migration-494a9e9-dirty.jar:?]
    ... 17 more

应用程序属性

#### Personalized Batch Configuration
batch.max_records=1
batch.max_wait_seconds=15
jdbcurl=wefwef
jdbcuser=wefwef
jdbcpass=fweijfwef
teradata.table=tester

标签： javaspringspring-boot

解决方案

  1. 找到包含主 Spring Boot 应用程序文件的包。它包含静态 main 方法并具有 @SpringBootApplication 注释。它应该看起来像这样：
@SpringBootApplication
public class MyApplication {
  public static void main(String[] args) {
  SpringApplication.run(MyApplication.class, args);   
}
  1. 确保您的TeradataConnector类位于步骤 1 中找到的 Spring Application 类的位置下方的包中。因此，如果您的 Spring Application 类位于： com.companyxyz.invoice
    那么您的 TeradataConnector 类必须是：com.companyxyz.invoice.someotherpackage

注意：它可以进一步下降。换句话说，它不必就在下面，就在某个地方的下面。

原因：默认情况下，Spring Boot 应用程序将在启动时仅扫描和自动装配主 Spring 应用程序包下的包中的组件。注意：您还可以添加 @ComponentScan 注释并告诉 Spring 如果组件不在您的目录下，在哪里可以找到它们。但是，除非有非常令人信服的理由，否则我建议将它们移到下方。

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