springboot 工程启动失败

Question

问题描述

springboot 启动失败

问题出现的环境背景及自己尝试过哪些方法

springboot 启动失败，console 出现很多错误信息
一开始是springboot 找不到 mapper,后来看问答发现 mapper 加一个 @component 注解便可
但是一启动发现有很多错误。（刚学 springboot,按照网上教程做的，不知道错在哪）

相关代码

// 请把代码文本粘贴到下方（请勿用图片代替代码）

---

SpringbootApplication.java

---

package com.luc.springboot;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.luc.springboot.mapper")
public class SpringbootApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootApplication.class, args);
    }
}

---

application.yml

---

server:
  port: 8080
#  servlet:
#    context-path: /hello
spring:
  mvc:
    view:
      prefix: /WEB-INF/views/
      suffix: .jsp

  datasource:
    url: jdbc:mysql://localhost:3306/test?characterEncoding=UTF-8
    username: root
    password: admin
    driver-class-name: com.mysql.jdbc.Driver #  com.mysql.cj.jdbc.Driver
  jpa:
    show-sql: true
    hibernate:
      ddl-auto: update
#debug: true

# 自定义配置文件信息
luc:
  title: abcde
  description: abcde
#  log 配置
logging:
  path: classpath:/log.txt
#  level: debug
#  可以根据包路径配置之不同资源的 log 级别

---

StudentMapper.java

---

package com.luc.springboot.mapper;

import com.luc.springboot.domain.Student;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Component;

import java.util.List;

@Component
public interface StudentMapper{
    @Select("select * from student")
    List<Student> findALL();
}

StudentController.java

package com.luc.springboot.controller;

import com.luc.springboot.domain.Student;
import com.luc.springboot.mapper.StudentMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class StudentController {

    @Autowired
    private StudentMapper studentMapper;

    @RequestMapping("/student")
    public String student(){
        List<Student> students = studentMapper.findALL();
        return students.toString();
    }
}

你期待的结果是什么？实际看到的错误信息又是什么？

期待结果肯定是想要正常运行

错误信息（太多了，一般信息我没有截取出来）
Loading class com.mysql.jdbc.Driver'. This is deprecated. The new driver class is com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
2018-11-08 11:35:07.988 INFO 5820 --- [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2018-11-08 11:35:07.988 WARN 5820 --- [ restartedMain] com.zaxxer.hikari.util.DriverDataSource : Registered driver with driverClassName=com.mysql.jdbc.Driver was not found, trying direct instantiation.
2018-11-08 11:35:09.481 ERROR 5820 --- [ restartedMain] com.zaxxer.hikari.pool.HikariPool : HikariPool-1 - Exception during pool initialization.
java.sql.SQLException: The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.

at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129) ~[mysql-connector-java-8.0.13.jar:8.0.13]
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97) ~[mysql-connector-java-8.0.13.jar:8.0.13]

2018-11-08 11:35:09.491 WARN 5820 --- [ restartedMain] o.s.b.a.orm.jpa.DatabaseLookup : Unable to determine jdbc url from datasource

org.springframework.jdbc.support.MetaDataAccessException: Could not get Connection for extracting meta-data; nested exception is org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.

at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:328) ~[spring-jdbc-5.1.2.RELEASE.jar:5.1.2.RELEASE]
at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:356) ~[spring-jdbc-5.1.2.RELEASE.jar:5.1.2.RELEASE]

2018-11-08 11:35:10.831 ERROR 5820 --- [ restartedMain] com.zaxxer.hikari.pool.HikariPool : HikariPool-1 - Exception during pool initialization.

java.sql.SQLException: The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.

at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129) ~[mysql-connector-java-8.0.13.jar:8.0.13]
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97) ~[mysql-connector-java-8.0.13.jar:8.0.13]

2018-11-08 11:35:10.834 WARN 5820 --- [ restartedMain] o.h.e.j.e.i.JdbcEnvironmentInitiator : HHH000342: Could not obtain connection to query metadata : The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.
2018-11-08 11:35:10.836 WARN 5820 --- [ restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
Related cause: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'studentMapper' defined in file [D:ProjectJavaWebProjectspringbootspringboottargetclassescomlucspringbootmapperStudentMapper.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required

2018-11-08 11:35:10.858 ERROR 5820 --- [ restartedMain] o.s.boot.SpringApplication : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1745) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]

Answer 1

首先，引起程序无法启动的问题是 com.zaxxer.hikari.pool.HikariPool 没能成功被 Spring 创建，原因是你的时区配置的有歧义，你需要在 jdbc url 后加上 &serverTimezone=Asia/Shanghai 这样无歧义的值。

除此之外，根据提示，你的 driver 字符串应该是用的 com.mysql.jdbc.Driver，新版已经变为 com.mysql.cj.jdbc.Driver。