인프런 커뮤니티 질문&답변

dependencies {
implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
implementation 'org.springframework.boot:spring-boot-starter-web'
runtimeOnly 'com.h2database:h2'
runtimeOnly 'mysql:mysql-connector-java:8.3.0'
testImplementation 'org.springframework.boot:spring-boot-starter-test'
}

위와 같이 dependencies를 설정했고

밑은 application.yml입니다.

spring:
datasource:
url: "jdbc:mysql://loca lhost/library"
username: "root"
password: "비밀번호"
driver-class-name: com.mysql.cj.jdbc.Driver

비밀번호는 알아서 설정했습니다.
오류가 생겨서 dependencies에서 runtimeOnly 'mysql:mysql-connector-java:8.3.0'로 설정했습니다.

밑에는 에러 표시입니다.

Execution failed for task ':LibraryAppApplication.main()'.

> Could not resolve all files for configuration ':runtimeClasspath'.

> Could not find mysql:mysql-connector-java:8.3.0.

Required by:

project :

Possible solution:

- Declare repository providing the artifact, see the documentation at https://docs.gradle.org/current/userguide/declaring_repositories.html

> Task :LibraryAppApplication.main() FAILED

Execution optimizations have been disabled for task ':LibraryAppApplication.main()' to ensure correctness due to the following reasons:

- Type 'org.gradle.api.tasks.JavaExec' property 'classpath' cannot be resolved: Could not resolve all files for configuration ':runtimeClasspath'. Reason: An input file collection couldn't be resolved, making it impossible to determine task inputs. Please refer to https://docs.gradle.org/7.5/userguide/validation_problems.html#unresolvable_input for more details about this problem.

Execution failed for task ':LibraryAppApplication.main()'.

> Could not resolve all files for configuration ':runtimeClasspath'.

> Could not find mysql:mysql-connector-java:8.3.0.

Required by:

project :

Possible solution:

- Declare repository providing the artifact, see the documentation at https://docs.gradle.org/current/userguide/declaring_repositories.html

Could not find mysql:mysql-connector-java:8.3.0.

Required by:

project :

Search in build.gradle files

뭐가 에러인가요..?

만약 Runtimeonly뒤에 version을 따로 기입하지 않는다면,
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure

라는 에러가 뜹니다.