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'dynamicDataSource' threw exception; nested exception is java.lang.IllegalStateException: dbType not support : null, url null
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:650) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:635) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1336) ~[spring-beans-5.2.9.RELEASE.jar:5.2.9.RELEASE]

系统启动报错，原因：未读取到多数据源配置：spring.datasource.druid

解决方法：检查配置是否正确、检查启动时加载配置是否有问题

我的case：

bootstrap.xml配置如下：

logging:
  config: classpath:log/log4j2-${spring.profiles.active}.xml
server:
  port: 1234
spring:
  application:
    name: xxx-server
  #环境 dev|test|prod
  profiles:
    active: local

错误原因： 导致logging.config中引用的变量在后面，无法找到，配置失效

解决方法：将logging.config挪至文件最后