How to resolve Error creating bean with name 'cobecService': Invocation of init method failed

When I try to start app with oracle database. I have a problem with service. Error creating bean with name ‘cobecService’: Invocation of init method failed

Presumably ‘cobecService’ is your own class?

Yes

org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘entityManagerFactory’ defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment] due to: Unable to resolve name [org.hibernate.dialect.Oracle12cDialect] as strategy [org.hibernate.dialect.Dialect]
this error is actual when I try to start app

Oracle 12c is not natively supported with the latest spring boot / hibernate anymore. That version is literally end of life.