Whitelabel Error Page 라고 나옵니다.. 구글링해 보면서 찾아보았는데 어떻게 해결하죠?(해결)

2024-04-11 12:48:27.471  INFO 24733 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2024-04-11 12:48:27.471  INFO 24733 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2024-04-11 12:48:27.472  INFO 24733 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 1 ms

h2-console로 들어갔을때의 에러 코드이고

이렇게 사이트 에러가 나오고

#spring:
#  config:
#    activate:
#      on-profile: local
#      datasource:
#        url: "jdbc:h2:mem:library;MODE=MYSQL;NON_KEYWORDS=USER"
#        username : "jo"
#        password : ""
#        driver-class-name : org.h2.Driver
#jpa:
#  hibernate:
#    ddl_auto : create
#    properties :
#      hibernate:
#        format_sql: true
#        show_sql : ture
#        dialect: org.hibernate.dialect.H2Dialect
#
#h2:
#  console:
#    enabled : true
#    path: /h2-console

  spring:
   config:
    activate:
      on-profile: local
  datasource:
    url: "jdbc:h2:mem:library;MODE=MYSQL;NON_KEYWORDS=USER"
    username: "sa"
    password: ""
    driver-class-name: org.h2.Driver
  jpa:
    hibernate:
      ddl-auto: create
    properties:
      hibernate:
        format_sql: true
        show_sql: true
        dialect: org.hibernate.dialect.H2Dialect
    open-in-view: false
  h2:
    console:
      enabled: true
      path: /h2-console

---
#spring:
#  datasource:
##    //Spring boot가 어떠한 dababase를 가리키게 할 것인가
#    url: "jdbc: mysql://localhost/library"
##        jdbc -> java로 만든 DB-connector
##        : mysql -> 종류는 mysql
##        //localhost 사용할 주소
##        /사용할 DB
#    username: "root"
#    password : "1234"
#    driver-class-name: com.mysql.cj.jdbc.Driver
##    DB에 접근할 때 사용할 프로그램을 의미
spring:
  config:
    active:
      on-profile: dev
  datasource:
    url: "jdbc:mysql://localhost/library"
    username: "root"
    password: ""
    driver-class-name: com.mysql.cj.jdbc.Driver

    jpa:
      hibernate:
        ddl-auto: none
        properties:
          hibernate:
            show_sql: true
            format_sql: true
            dialect : org.hibernate.dialect.MySQL8Dialect
            open-in-view: false

작성한 yml코드 입니다...

2024-04-11 18:52:49.259  INFO 27511 --- [           main] c.g.libraryapp.LibraryAppApplication     : Starting LibraryAppApplication using Java 18.0.2 on Jun0.local with PID 27511 (/Users/jojun-yeong/Desktop/강의 자료/1월25/Java_Spring_Library_Application/library-app/out/production/classes started by jojun-yeong in /Users/jojun-yeong/Desktop/강의 자료/1월25/Java_Spring_Library_Application/library-app)
2024-04-11 18:52:49.262  INFO 27511 --- [           main] c.g.libraryapp.LibraryAppApplication     : The following 1 profile is active: "local"
2024-04-11 18:52:49.899  INFO 27511 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2024-04-11 18:52:49.959  INFO 27511 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 51 ms. Found 3 JPA repository interfaces.
2024-04-11 18:52:50.529  INFO 27511 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2024-04-11 18:52:50.539  INFO 27511 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2024-04-11 18:52:50.540  INFO 27511 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.69]
2024-04-11 18:52:50.632  INFO 27511 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2024-04-11 18:52:50.632  INFO 27511 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1317 ms
2024-04-11 18:52:50.798  INFO 27511 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
2024-04-11 18:52:51.112  INFO 27511 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
2024-04-11 18:52:51.164  INFO 27511 --- [           main] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [name: default]
2024-04-11 18:52:51.233  INFO 27511 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate ORM core version 5.6.14.Final
2024-04-11 18:52:51.460  INFO 27511 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.1.2.Final}
2024-04-11 18:52:51.577  INFO 27511 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.MySQL8Dialect
2024-04-11 18:52:52.113  INFO 27511 --- [           main] o.h.e.t.j.p.i.JtaPlatformInitiator       : HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
2024-04-11 18:52:52.121  INFO 27511 --- [           main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2024-04-11 18:52:52.547  WARN 27511 --- [           main] JpaBaseConfiguration$JpaWebConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2024-04-11 18:52:52.793  INFO 27511 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2024-04-11 18:52:52.799  INFO 27511 --- [           main] c.g.libraryapp.LibraryAppApplication     : Started LibraryAppApplication in 4.005 seconds (JVM running for 4.452)