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My Spring Boot Project trying connect to MYSQL database with driver mysql-connector-java . I have import newest mysql driver and spring-boot-starter-data-jpa

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>
I have configured database connection in application.properties file
spring.jpa.hibernate.ddl-auto=update
spring.datasource.url=jdbc:mysql://${MYSQL_HOST:localhost}:3306/db_example
spring.datasource.username=somethingfunny
spring.datasource.password=somethingfunny
spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
#spring.jpa.show-sql: true
MYSQL version is 8.0.26
Spring boot version 2.6.2
When run project with Intellij I get error
Caused by: org.springframework.beans.BeanInstantiationException:
Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory
method 'dataSource' threw exception; nested exception is
java.lang.IllegalStateException: Cannot load driver class:
com.mysql.cj.jdbc.Driver  at
org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
~[spring-beans-5.3.14.jar:5.3.14]     at
org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653)
~[spring-beans-5.3.14.jar:5.3.14]     ... 35 common frames omitted Caused
by: java.lang.IllegalStateException: Cannot load driver class:
com.mysql.cj.jdbc.Driver  at
org.springframework.util.Assert.state(Assert.java:97)
~[spring-core-5.3.14.jar:5.3.14]  at
org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.determineDriverClassName(DataSourceProperties.java:241)
~[spring-boot-autoconfigure-2.6.2.jar:2.6.2]  at
org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.initializeDataSourceBuilder(DataSourceProperties.java:193)
~[spring-boot-autoconfigure-2.6.2.jar:2.6.2]  at
org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration.createDataSource(DataSourceConfiguration.java:48)
~[spring-boot-autoconfigure-2.6.2.jar:2.6.2]  at
org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration$Hikari.dataSource(DataSourceConfiguration.java:90)
~[spring-boot-autoconfigure-2.6.2.jar:2.6.2]  at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
Method) ~[na:na]  at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
~[na:na]  at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
~[na:na]  at
java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
~[spring-beans-5.3.14.jar:5.3.14]     ... 36 common frames omitted
I have refered the post about Cannot load driver class: com.mysql.jdbc.Driver (NOT com.mysql.cj.jdbc.Driver), I cannot apply for my project because my project get error when using com.mysql.cj.jdbc.Driver but not com.mysql.jdbc.Driver.
I also refered this post Cannot load driver class: com.mysql.cj.jdbc.Driver. But i can not find correct answer(the answer is marked corrected) for this error.
How to fix this error ?
Have you checked which version of MySQL connector do you have?
Since you haven't specified the version in your pom.xml, there is a chance that it pulled version 5 and now it is complaining about that .cj which is required for version 8.
That might be the reason why is it working without .cj ( com.mysql.jdbc.Driver ), because it pulled the version 5.
Manually add the version in your pom.xml and keep .cj as it is.
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.16</version>
</dependency>
After that make sure that you pull your dependencies.
But make sure that you check in your project if you do have ONLY version 8 after "mvn clean install".
As of the picture that you shared "mysql version", that means nothing, the exception is regarding mysql-connector jar, it has nothing to do with the workbench, you can still have workbench version 5, and use mysql-connector jar version 8, it will make no difference.
In any version of mysql workbench ( 5 or 8 ):
mysql-connector 8 jar = requires .cj
mysql-connector 5 jar = does not require .cj
The only thing that you need to do is define the version of mysql-connector-java in your pom.xml
Fix the line that sets jdbc driver class as below: I don't think it matters but driver-class-name is more common. And check if your build file is up to date. Might as well try re-building using pom.xml
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
                she already said "my project get error when using com.mysql.cj.jdbc.Driver but not com.mysql.jdbc.Driver." I don't that that renaming the key to driver-class-name would be helpful.
– zawarudo
                Dec 28, 2021 at 12:46
                com.mysql.jdbc.Driver -> com.mysql.cj.jdbc.Driver is relevant to mysql version and I didn't say anything about that. And I did say I don't think it matters but try if it fixes it. And I did say build it again because often that fixes it. And yeah there you go. As you can see from OP's answer it was simple build-again-and-fixed kind of deal.
– jeff pentagon
                Dec 29, 2021 at 2:43
        
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