Could not create connection to database server via Docker

Question

I have created a simple spring boot app to communicate with MYSQL via docker using the same network. Once I run docker-compose up command then following errors have occurred

employee-jdbc-container | java.sql.SQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.

employee-jdbc-container | Caused by: com.mysql.cj.exceptions.UnableToConnectException: Public Key Retrieval is not allowed

docker-compose.yml

version: "3"   
services:
  employee-mysql:
             image: employee-jdbc
             container_name: employee-jdbc-container
             ports:
             - "9090:9090"
             networks:
               - employee-mysql2    
             depends_on:
               - mysqldb
  mysqldb:
         image: mysql:8
         container_name: mysqldb
         ports:
         - "3306:3306"
         networks:
           - employee-mysql2
         environment:
           - MYSQL_USER=root
           - MYSQL_ROOT_PASSWORD=root
           - MYSQL_DATABASE=HR
networks:                     
    employee-mysql2:

application.yml

server:
  port: 9090

spring:
  datasource:
    url: "jdbc:mysql://mysqldb:3306/HR?createDatabaseIfNotExists=true&autoReconnect=true&useSSL=false"
    username: root
    password: root
    platform: mysql
    initialization-mode: always
    driver-class-name: com.mysql.cj.jdbc.Driver
  jpa:
    database-platform: org.hibernate.dialect.MySQL8Dialect

I think the problem in the configuration file but have no idea what is wrong.

Please try to connect to the database with a different tool, to see if it's working. If the db works, the issue is probably within in the application.yml. — RatzzFatzz
– RatzzFatzz, Commented Aug 31, 2020 at 8:44
Are you sure your DB is up, when connection is made? Did you try to repeat docker-compose up after short period? (it should restart your application while keep DB inact.) — GintsGints
– GintsGints, Commented Aug 31, 2020 at 8:49
Your error suggests, you need to update starting options - stackoverflow.com/questions/50379839/… — GintsGints
– GintsGints, Commented Aug 31, 2020 at 8:51
@RatzzFatzz MYSQL has not been installed in my local machine. if there any other way to check it without installing it in the local machine — Nafaz M N M
– Nafaz M N M, Commented Aug 31, 2020 at 9:07

Nafaz M N M · Accepted Answer · 2020-09-29 08:25:26Z

finally, I have found another way to run both containers without any issue.

first set MySQL environment

docker pull mysql:8

then run the image as a container

docker container run -d --name mysql-db -e MYSQL_ROOT_PASSWORD=<root_password> -e MYSQL_DATABASE=<database_name>
-e MYSQL_USER=<user> -e MYSQL_PASSWORD=<password>  mysql:8(image name with version)

second set spring boot environment

application.yml

server:
  port: 9090

spring:
  datasource:
    url: "jdbc:mysql://mysql-db/<database_name>?createDatabaseIfNotExists=true&autoReconnect=true&allowPublicKeyRetrieval=true&useSSL=false"
    username: <username>
    password: <password>
    initialization-mode: always
    driver-class-name: com.mysql.cj.jdbc.Driver
    tomcat:
      test-while-idle: true
      validation-query: SELECT 1
  jpa:
    database-platform: org.hibernate.dialect.MySQL8Dialect
    show-sql: true
    hibernate:
      ddl-auto: update

Docker file

FROM openjdk:11
COPY ./target/employee-mysql.jar employee-mysql.jar
EXPOSE <port number> (where your application is running)
ENTRYPOINT ["java","-jar","employee-mysql.jar"]

build a docker image for spring boot app

docker image build -t employee-jdbc .

run the employee-jdbc image as a container

docker container run -d --name employee-mysql -p 9090:9090 --link mysql-db:mysql(mysql is the image of mysql-db container) employee-jdbc(employee-jdbc is the image of employee-mysql container)

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