Question

我有一个Spring Boot应用程序，其中正在为yml文件使用环境属性。

我的application.yml看起来像这样：

spring:
  datasource:
    url: ${DB_URL}
    driver-class-name: ${DB_DRIVER}
    username: ${DB_USERNAME}
    password: ${DB_PASSWORD}
    connectionTestQuery: SELECT 1 FROM DUAL
    max-wait: ${database.max-wait:5000}
    max-active: ${database.max-active:500}
    test-on-borrow: ${database.test-on-borrow:true}
    initialization-mode: always

当我尝试通过Tomcat将其部署在外部主机中时，该应用程序无法启动，因为它无法读取环境变量。我收到以下错误

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.autoconfigure.jdbc.DataSourceInitializerInvoker': Invocation of init method failed; nested exception is org.springframework.jdbc.datasource.init.UncategorizedScriptException: Failed to execute database script; nested exception is org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: Access denied for user '${DB_USERNAME}'@'localhost' (using password: YES)
            at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1794)
            at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594)
            at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516)
            at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324)
            at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226)
            at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322)
            at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:227)
            at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveNamedBean(DefaultListableBeanFactory.java:1175)
            at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveBean(DefaultListableBeanFactory.java:420)
            at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:350)
            at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:343)
            at org.springframework.boot.autoconfigure.jdbc.DataSourceInitializerPostProcessor.postProcessAfterInitialization(DataSourceInitializerPostProcessor.java:52)
            at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:430)
            at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1798)
            at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594)
            ... 134 more

我正在使用Ubuntu服务器。我在/etc/environment上设置了环境变量，它们看起来像这样

DB_URL="jdbc:mysql://XX.XX.XX.XX:3306/XXXXX"
DB_USER="XXXXX"
DB_PASSWORD="XXXXX"
DB_DRIVER="com.mysql.cj.jdbc.Driver"

当我运行命令set时，它们会完美显示在这里。我还尝试在setenv.sh下创建一个/opt/tomcat/bin文件，如下所示：

#!/bin/bash
export DB_DRIVER=com.mysql.cj.jdbc.Driver
export DB_PASSWORD=XXXXXX
export DB_URL=jdbc:mysql://XX.XX.XX.XX:3306/XXXXX
export DB_USER=XXXXXX

我没有尝试在配置文件中执行此操作，因为根据此线程，使用/etc/environment就足够了： https://unix.stackexchange.com/questions/117467/how-to-permanently-set-environmental-variables

知道我可能会缺少什么吗？

Answer 1

可能是您输入了错误的凭据。只需使用某些MySql GUI工具（例如工作台，sqlyog ...）交叉检查相同的凭据即可。

Answer 2

您可以使用spring.config.location为外部化的配置文件设置显式路径。然后，您可以配置Spring Boot应用程序以在启动时将它们作为系统属性加载。

例如

Properties props = new Properties();
props.setProperty("spring.config.location",<your config file path>);

来源：here

Answer 3

您正在使用的Spring Boot属性文件中

$ {DB_USERNAME}

以及您正在使用的bash配置文件中

导出DB_USER = XXXXXX

将bash文件更改为

导出$ {DB_USERNAME} = XXXXXX

Spring Boot应用程序无法读取环境属性

3 个答案: