A component required a bean named 'entityManagerFactory' that could not be found.

jpa引入项目，却无法运行，说找不到，工厂管理类，原因是谷歌的默认类指向另一个地方，需要手动在application那里，手动添加一个自动寻找的字段

package com.example;


import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;

/**
 * @author zhangzhiwei
 */
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
public class DemoBackendApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoBackendApplication.class, args);
    }
}