SpringBoot数据库配置问题解析

MySQL服务端和客户端不一致

服务可以正常启动，但数据库操作就一直等待中。异常日志返回如下：

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 3 milliseconds ago.  The last packet sent successfully to the server was 3 milliseconds ago.

Caused by: javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException: java.security.cert.CertPathValidatorException: Path does not chain with any of the trust anchors

这里的原因是mysql版本问题导致的，我本地MySQL服务端的版本是:

mysql  Ver 8.0.22 for osx10.16 on x86_64 (Homebrew)

但maven配置MySQL用的却是5.7的客户端，就会导致链接MySQL数据库异常，一直处于等待中。

解决方法
更改maven中MySQL依赖包的版本，然后重新编译就可以了。

  mysql
  mysql-connector-java
  8.0.18

MySQL连接配置问题

服务根本启动不起来，异常日志如下：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.cloud.autoconfigure.RefreshAutoConfiguration$JpaInvokerConfiguration': Invocation of init method failed; nested exception is 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.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [cn/lalaframework/dynamic/datasource/spring/boot/autoconfigure/DynamicDataSourceAutoConfiguration.class]: Invocation of init method failed; nested exception is java.lang.RuntimeException: dynamic-datasource Please check the setting of primary
    
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.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [cn/lalaframework/dynamic/datasource/spring/boot/autoconfigure/DynamicDataSourceAutoConfiguration.class]: Invocation of init method failed; nested exception is java.lang.RuntimeException: dynamic-datasource Please check the setting of primary
    

意思大致是数据库连接的主配置获取不到，指定master主配置就可以了。

错误配置：

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/cp_mcv_monitor?characterEncoding=utf8&useSSL=true
spring.datasource.username=root
spring.datasource.password=root

正确配置：

spring.datasource.dynamic.primary=master
spring.datasource.dynamic.datasource.master.url=jdbc:mysql://localhost:3306/cp_mcv_monitor?characterEncoding=utf8&useSSL=true
spring.datasource.dynamic.datasource.master.username=root
spring.datasource.dynamic.datasource.master.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver