我是 spring 新手，并作為起點遵循教程@Spring IO 教程我已經使用Web、JPA、H2和Lombok使用Eclipse和Maven從 spring 初始化程序下載了項目。以下是代碼集：PayrollApplication.java  package com.spring.payroll;  import org.springframework.boot.SpringApplication;  import org.springframework.boot.autoconfigure.SpringBootApplication;  @SpringBootApplication       public class PayrollApplication {  public static void main(String[] args) {    SpringApplication.run(PayrollApplication.class, args);  }   }Employee.java  package com.spring.payroll;  import lombok.Data;  import javax.persistence.Entity;  import javax.persistence.Id;  import javax.persistence.GeneratedValue;;  @Data       @Entity     // This is a domain object definition  public class Employee {      private @Id @GeneratedValue Long id;      private String name;      private String role;      //Constructor now      Employee(String name, String role){                this.name = name;                this.role = role;      }        }EmployeeRepository 接口： package com.spring.payroll; import org.springframework.data.jpa.repository.JpaRepository; public interface EmployeeRepository extends JpaRepository<Employee, Long>{ }LoadDatabase放置一些初始數據： package com.spring.payroll; import lombok.extern.slf4j.Slf4j; import org.springframework.boot.CommandLineRunner; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration @Slf4j public class LoadDatabase {     @Bean     CommandLineRunner initDatabase(EmployeeRepository repository) {    return args -> {        repository.save(new Employee("A La BD", "Engineer"));        repository.save(new Employee("Arvind", "Engineer"));        System.out.println("Preloading data successful");         };       }        }當我嘗試 Maven 全新安裝時，它在 TEST 步驟中失敗，如下所示：<< 重試后通過將 Jackson 依賴項添加到 pom.xml 進行編輯>>