Update application.properties

src/main/resources/application.properties

  spring.jpa.hibernate.ddl-auto=update
-spring.datasource.url=jdbc:mysql://localhost:3306/helloworld?
+spring.datasource.url=jdbc:mysql://localhost:3306/helloworld
 spring.datasource.username=admin
 spring.datasource.password=admin
\ No newline at end of file