Spring 从命令行引导读取属性文件无法解析占位符'ConfigPath'

Question

我正在尝试从命令行读取配置文件。主要是我这样做：

public static void main(String[] args) {
        if(args.length > 0) {
            SpringApplication.run(HeliosAdminBackendApplication.class, args);
        } else {
            System.out.println("Error");
            System.exit(0); 
        }       
    }

而且，，我创建了一个 class MyConfig，如下所示：

import lombok.Getter;

@Configuration
@ConfigurationProperties
@PropertySource(value = "file:${ConfigPath}")
public class MyConfig {

     @Getter
     @Value("${property_name}")
     private String myproperty;

}

然后我创建了 .jar 文件，然后进入包含 jar 的文件夹并尝试运行它通过执行以下操作：

java -jar myapp.jar --spring.config.location=file:application.yml

我的 application.yml 文件和我的 jar 是同一个文件夹。我还将路径设置为 C:/my/path/to/folder/ 但错误仍然存在。路径写错了吗？还是我必须 add/modify 代码中的某些内容？

编辑

完整堆栈跟踪：

Exception in thread "main" java.lang.reflect.InvocationTargetException at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) at org.springframework.boot.loader.Launcher.launch(Launcher.java:50) at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51) Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [it.sysdata.helios_backend_admin.HeliosAdminBackendApplication]; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'ConfigPath' in value "file:${ConfigPath}" at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:181) at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:315) at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:232) at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275) at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:95) at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:691) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:528) at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) at it.sysdata.helios_backend_admin.HeliosAdminBackendApplication.main(HeliosAdminBackendApplication.java:24) ... 8 more Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'ConfigPath' in value "file:${ConfigPath}" at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:172) at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124) at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:237) at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:211) at org.springframework.core.env.AbstractEnvironment.resolveRequiredPlaceholders(AbstractEnvironment.java:575) at org.springframework.context.annotation.ConfigurationClassParser.processPropertySource(ConfigurationClassParser.java:450) at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:271) at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:242) at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:191) at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:295) at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:242) at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:199) at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:167) ... 21 more

Answer 1

以下是您关于为什么我必须使用 "additional" 而不仅仅是位置的问题的答案？

首先，当您使用 spring.config.location 加载配置属性时，spring-boot 会尝试在类路径或配置目录下搜索配置。这是搜索顺序-

            file:./config/
            file:./
            classpath:/config/
            classpath:/

但请记住，如果您使用的是 spring.config.locaton，那么它将始终查找 "classpath" 或 "config" 而不是外部配置。

要加载外部 configuration/custom 配置然后 spring 引导提供 "spring.config.additional-location" 按以下顺序搜索配置 -

            file:./custom-config/
            classpath:custom-config/ (This is was your case)
            file:./config/
            file:./
            classpath:/config/
            classpath:/

我希望现在知道为什么要使用 "spring.config.additional-location" 来加载外部配置。

Spring 从命令行引导读取属性文件无法解析占位符'ConfigPath'

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