Spring boot app cant connect to mysql db - docker-compose - mysql

Question

I tried many ways and every time the application runs in the container I get such errors:
WARN 1 --- [ main] o.h.e.j.e.i.JdbcEnvironmentInitiator : HHH000342: Could not obtain connection to query metadata
java.lang.IllegalStateException: Cannot get a connection as the driver manager is not properly initialized
my docker-compose:
version: '3.8'
networks:
my_network:
external: true
services:
mysql:
container_name: configs_mysql
image: mysql:latest
restart: always
ports:
- "3306:3306"
environment:
MYSQL_ROOT_PASSWORD: scrap
MYSQL_USER: scrap
MYSQL_PASSWORD: scrap
MYSQL_DATABASE: configs
networks:
- my_network
web:
build: .
image: scrapyconfigmanager_web
ports:
- "8181:8181"
networks:
- my_network
depends_on:
- mysql
my Dockerfile:
FROM openjdk:11
# Copy source code to temporary building location
WORKDIR /source_code
COPY . .
RUN ./gradlew bootJar
WORKDIR /scrapy
RUN cp /source_code/build/libs/ScrapyConfigManager-1.0.jar .
EXPOSE 8181
ENTRYPOINT ["java","-jar","ScrapyConfigManager-1.0.jar"]
my hibernate.cfg:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.cj.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://configs_mysql:3306/configs</property>
<property name="hibernate.connection.username">scrap</property>
<property name="hibernate.connection.password">scrap</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>
<mapping class="org.scrapeusz.model.OlxCar" />
</session-factory>
</hibernate-configuration>
Both containers start up, but after a while the spring container stops.
Below I paste part of the code from the terminal after the "docker-compose up" command:
Creating configs_mysql ... done
Creating scrapyconfigmanager_web_1 ... done
Attaching to configs_mysql, scrapyconfigmanager_web_1
configs_mysql | 2022-07-21 10:34:49+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.29-1.el8 started.
configs_mysql | 2022-07-21 10:34:49+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql'
configs_mysql | 2022-07-21 10:34:49+00:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.29-1.el8 started.
configs_mysql | 2022-07-21 10:34:49+00:00 [Note] [Entrypoint]: Initializing database files
configs_mysql | 2022-07-21T10:34:49.504138Z 0 [System] [MY-013169] [Server] /usr/sbin/mysqld (mysqld 8.0.29) initializing of server in progress as process 42
configs_mysql | 2022-07-21T10:34:49.515175Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
configs_mysql | 2022-07-21T10:34:49.795876Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
web_1 |
web_1 | . ____ _ __ _ _
web_1 | /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
web_1 | ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
web_1 | \\/ ___)| |_)| | | | | || (_| | ) ) ) )
web_1 | ' |____| .__|_| |_|_| |_\__, | / / / /
web_1 | =========|_|==============|___/=/_/_/_/
web_1 | :: Spring Boot :: (v2.6.6)
web_1 |
web_1 | 2022-07-21 10:34:50.905 INFO 1 --- [ main] org.scrapeusz.ScrapyConfigManager : Starting ScrapyConfigManager using Java 11.0.15 on 71d7d66bbd3b with PID 1 (/scrapy/ScrapyConfigManager-1.0.jar started by root in /scrapy)
web_1 | 2022-07-21 10:34:50.910 INFO 1 --- [ main] org.scrapeusz.ScrapyConfigManager : No active profile set, falling back to 1 default profile: "default"
configs_mysql | 2022-07-21T10:34:51.393524Z 6 [Warning] [MY-010453] [Server] root#localhost is created with an empty password ! Please consider switching off the --initialize-insecure option.
web_1 | 2022-07-21 10:34:52.239 INFO 1 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
web_1 | 2022-07-21 10:34:52.255 INFO 1 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
web_1 | 2022-07-21 10:34:52.255 INFO 1 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.60]
web_1 | 2022-07-21 10:34:52.364 INFO 1 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
web_1 | 2022-07-21 10:34:52.364 INFO 1 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1388 ms
web_1 | 2022-07-21 10:34:52.577 INFO 1 --- [ main] org.hibernate.Version : HHH000412: Hibernate ORM core version 6.0.0.Final
web_1 | 2022-07-21 10:34:53.269 WARN 1 --- [ main] org.hibernate.orm.connections.pooling : HHH10001002: Using built-in connection pool (not intended for production use)
web_1 | 2022-07-21 10:34:53.275 INFO 1 --- [ main] org.hibernate.orm.connections.pooling : HHH10001005: Loaded JDBC driver class: com.mysql.cj.jdbc.Driver
web_1 | 2022-07-21 10:34:53.275 INFO 1 --- [ main] org.hibernate.orm.connections.pooling : HHH10001012: Connecting with JDBC URL [jdbc:mysql://configs_mysql:3306/configs]
web_1 | 2022-07-21 10:34:53.275 INFO 1 --- [ main] org.hibernate.orm.connections.pooling : HHH10001001: Connection properties: {password=****, user=scrap}
web_1 | 2022-07-21 10:34:53.276 INFO 1 --- [ main] org.hibernate.orm.connections.pooling : HHH10001003: Autocommit mode: false
web_1 | 2022-07-21 10:34:53.279 INFO 1 --- [ main] org.hibernate.orm.connections.pooling : HHH10001115: Connection pool size: 20 (min=1)
web_1 | 2022-07-21 10:34:53.407 WARN 1 --- [ main] o.h.e.j.e.i.JdbcEnvironmentInitiator : HHH000342: Could not obtain connection to query metadata
web_1 |
web_1 | java.lang.IllegalStateException: Cannot get a connection as the driver manager is not properly initialized
web_1 | at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.getConnection(DriverManagerConnectionProviderImpl.java:259) ~[hibernate-core-6.0.0.Final.jar!/:6.0.0.Final]
web_1 | at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcEnvironmentInitiator.java:284) ~[hibernate-core-6.0.0.Final.jar!/:6.0.0.Final]
web_1 | at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:177) ~[hibernate-core-6.0.0.Final.jar!/:6.0.0.Final]
web_1 | at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:36) ~[hibernate-core-6.0.0.Final.jar!/:6.0.0.Final]
web_1 | at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:100) ~[hibernate-core-6.0.0.Final.jar!/:6.0.0.Final]
web_1 | at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:255) ~[hibernate-core-6.0.0.Final.jar!/:6.0.0.Final]
web_1 | at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:230) ~[hibernate-core-6.0.0.Final.jar!/:6.0.0.Final]
web_1 | at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:207) ~[hibernate-core-6.0.0.Final.jar!/:6.0.0.Final]
web_1 | at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:48) ~[hibernate-core-6.0.0.Final.jar!/:6.0.0.Final]

Answer 1

The issue is with your hibernate.cfg file.
You are referring container name as database host in that config file.
<property name="hibernate.connection.url">jdbc:mysql://configs_mysql:3306/configs</property>
configs_mysql is your container name but it not your DB host in the docker world. Remember communication between the docker containers inside the docker compose network will happen through service name.
For Database service you defined mysql as your service name.
Change the hibernate.connection.url to below
<property name="hibernate.connection.url">jdbc:mysql://mysql:3306/configs</property>
Refer: Docker compose with multiple services (app and DB)