Java Docker Mysql 8，Docker spring boot-未能配置数据源：'；url'；属性未指定

我一直在研究所有可能的排列，但都没有成功

->应用程序属性

## DATASOURCE
#local connection
#spring.datasource.url=jdbc:mysql://localhost:3306/Apple?useSSL=false&allowPublicKeyRetrieval=true&createDatabaseIfNotExist=true&autoReconnect=true
# docker network connection
spring.datasource.url=jdbc:mysql://mysqldb_container:3306/Apple?useSSL=false&allowPublicKeyRetrieval=true&createDatabaseIfNotExist=true&autoReconnect=true
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

->格雷德尔先生

plugins {
    id 'org.springframework.boot' version '2.2.4.RELEASE';
    id 'io.spring.dependency-management' version '1.0.9.RELEASE'
    id 'java'
}; group 'org.example'; version '1.0-SNAPSHOT'; sourceCompatibility = 1.8; repositories { mavenCentral() }; dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-web'
    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
    implementation('mysql:mysql-connector-java'); testCompile group: 'junit', name: 'junit', version: '4.12'
}

->Dockerfile

From openjdk:8
copy build/libs/Java_Mysql_Docker-1.0-SNAPSHOT.jar java_mysql_docker_jar.jar
CMD ["java","-jar","java_mysql_docker_jar.jar"]

->docker命令

docker network create java_mysql_docker_network
docker container run --name mysqldb_container --network java_mysql_docker_network -e MYSQL_ROOT_PASSWORD=root -e MYSQL_DATABASE=Apple -p 3306:3306 -d mysql:8
gradle clean build
docker build -t java_mysql_docker_image .
docker container run --name java_mysql_docker_image_container --network java_mysql_docker_network -p 8080:8080 java_mysql_docker_image

->例外说明：

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
Reason: Failed to determine a suitable driver class

相同的应用程序在本地安装的MySQL 8上运行良好，用于以下URL

spring.datasource.url=jdbc:mysql://localhost:3306/Apple?useSSL=false&allowPublicKeyRetrieval=true&createDatabaseIfNotExist=true&autoReconnect=true

但Docker MySQL 8失败

spring.datasource.url=jdbc:mysql://mysqldb_container:3306/Apple?useSSL=false&allowPublicKeyRetrieval=true&createDatabaseIfNotExist=true&autoReconnect=true

---

显然，注释驱动程序适用于本地安装和docker MySQL 8

#spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

但我还是想解释一下为什么会这样。

我猜是这样

# This driver is not in the classpath.
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver


# Spring auto-detects the driver based on the JDBC URL. This one. 
# Explicitly setting the driver that is in the class path.
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

您看到的错误来自spring boot项目中的此类：

春季文件：

你看过这篇文章了吗？