Java 学习笔记（二）

   10、页面上显示的创建时间 比数据库里记录的多了14小时

　　查看了 https://www.cnblogs.com/jason1990/archive/2018/11/28/10032181.html  之后 找到了解决方案是 在数据库链接后面加上

serverTimezone=GMT%2B8

jdbc:mysql://localhost:3306/table_name?useTimezone=true&serverTimezone=GMT%2B8

   11、pagehelper不起作用

https://www.cnblogs.com/zqyw/p/11029116.html

<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper-spring-boot-starter</artifactId>
    <version>1.2.5</version>
</dependency>

 12、IDEA 不能实时刷新HTML页面 

         修改file->settings->build,excution,deployment->compiler->build project automatally

         在IDEA中，按快捷键：Ctrl+Shift+Alt+/, 选registry

         详细参见：https://www.cnblogs.com/xphhh/p/11355336.html

 13、IDEA Maven的Dependencies中出现红色波浪线   

         clean maven， 然后剪切pom.xml中的dependency, 保存； 再clean maven，再黏贴回来dependency，保存。 好了。 https://blog.csdn.net/u014672466/article/details/80211340

  14、遇到DataSource下载数据库驱动失败时，可以将文件拷到  C:Usersusername.IntelliJIdea2019.2configjdbc-driversMySQL ConnectorJ 88.0.15 目录下， 该目录下一共两个文件 mysql-connector-java-8.0.15.jar 和 mysql-connector-license.txt

         这里也有另外一种解决方案： https://www.cnblogs.com/badaoliumangqizhi/p/11885753.html 

  15、所有的Test方法都失败，原因竟然是源码编译不过！！

  16、有多个地方重复扫描了mapper

10:09:44.643  WARN 10424 --- [  restartedMain] o.m.s.mapper.ClassPathMapperScanner      : Skipping MapperFactoryBean with name 'spSysTitleEmpDao' and 'com.speedpro.erp.factory.dao.SpSysTitleEmpDao' mapperInterface. Bean already defined with the same name!
10:09:44.643 WARN 10424 --- [ restartedMain] o.m.s.mapper.ClassPathMapperScanner      : No MyBatis mapper was found in '[com.speedpro.erp.factory.dao]' package. Please check your configuration.

   17、Invalid bound statement (not found): com.xxxxx.erp.factory.dao.SpInvInvoiceDao.queryById

   添加如下配置到pom.xml的build节点下：

        <resources>
            <resource>
                <directory>${basedir}/src/main/java</directory>
                <includes>
                    <include>**/*/*.xml</include>
                </includes>
            </resource>
        </resources>

   18、输出mybatis的sql语句：

           在application.yml中的mybatis节点下添加  configuration ：

mybatis:
  mapper-locations: classpath:mapper/*/*.xml
  type-aliases-package: com.xxxxxx.erp.factory.entity
  not-empty: true
  identity: MYSQL
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

  19、 The bean 'scopedTarget.oauth2ClientContext', defined in class path resource [org/springframework/boot/autoconfigure/security/oauth2/client/OAuth2RestOperationsConfiguration$SessionScopedConfiguration$ClientContextConfiguration.class], could not be registered. A bean with that name has already been defined in class path resource [org/springframework/security/oauth2/config/annotation/web/configuration/OAuth2ClientConfiguration$OAuth2ClientContextConfiguration.class] and overriding is disabled.

   在application.yml中添加

spring:
  main:
    allow-bean-definition-overriding: true