积土成山，风雨兴焉；积水成渊，蛟龙生焉；积善成德，而神明自得，圣心备焉。故不积跬步，无以至千里，不积小流无以成江海。齐骥一跃，不能十步，驽马十驾，功不在舍。面对悬崖峭壁，一百年也看不出一条裂缝来，但用斧凿，能进一寸进一寸，能进一尺进一尺，不断积累，飞跃必来，突破随之。

目录

SpringBoot项目启动报错问题

2022年8月23日

在测试springboot项目时出现了以下错误：

============================
CONDITIONS EVALUATION REPORT
============================


Positive matches:
-----------------

   AopAutoConfiguration matched:
      - @ConditionalOnProperty (spring.aop.auto=true) matched (OnPropertyCondition)

   AopAutoConfiguration.ClassProxyingConfiguration matched:
      - @ConditionalOnMissingClass did not find unwanted class 'org.aspectj.weaver.Advice' (OnClassCondition)
      - @ConditionalOnProperty (spring.aop.proxy-target-class=true) matched (OnPropertyCondition)

   DataSourceAutoConfiguration matched:
      - @ConditionalOnClass found required classes 'javax.sql.DataSource', 'org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType' (OnClassCondition)
      - @ConditionalOnMissingBean (types: io.r2dbc.spi.ConnectionFactory; SearchStrategy: all) did not find any beans (OnBeanCondition)

   DataSourceAutoConfiguration.PooledDataSourceConfiguration matched:
      - AnyNestedCondition 1 matched 1 did not; NestedCondition on DataSourceAutoConfiguration.PooledDataSourceCondition.PooledDataSourceAvailable PooledDataSource found supported DataSource; NestedCondition on DataSourceAutoConfiguration.PooledDataSourceCondition.ExplicitType @ConditionalOnProperty (spring.datasource.type) did not find property 'type' (DataSourceAutoConfiguration.PooledDataSourceCondition)
      - @ConditionalOnMissingBean (types: javax.sql.DataSource,javax.sql.XADataSource; SearchStrategy: all) did not find any beans (OnBeanCondition)

   DataSourceConfiguration.Hikari matched:
      - @ConditionalOnClass found required class 'com.zaxxer.hikari.HikariDataSource' (OnClassCondition)
      - @ConditionalOnProperty (spring.datasource.type=com.zaxxer.hikari.HikariDataSource) matched (OnPropertyCondition)
      - @ConditionalOnMissingBean (types: javax.sql.DataSource; SearchStrategy: all) did not find any beans (OnBeanCondition)

   DataSourceInitializationConfiguration matched:
      - @ConditionalOnClass found required class 'org.springframework.jdbc.datasource.init.DatabasePopulator' (OnClassCondition)
      - @ConditionalOnSingleCandidate (types: javax.sql.DataSource; SearchStrategy: all) found a single bean 'dataSource'; @ConditionalOnMissingBean (types: org.springframework.boot.autoconfigure.sql.init.SqlDataSourceScriptDatabaseInitializer,org.springframework.boot.autoconfigure.sql.init.SqlR2dbcScriptDatabaseInitializer; SearchStrategy: all) did not find any beans (OnBeanCondition)

   DataSourcePoolMetadataProvidersConfiguration.HikariPoolDataSourceMetadataProviderConfiguration matched:
      - @ConditionalOnClass found required class 'com.zaxxer.hikari.HikariDataSource' (OnClassCondition)

   DataSourceTransactionManagerAutoConfiguration matched:
      - @ConditionalOnClass found required classes 'org.springframework.jdbc.core.JdbcTemplate', 'org.springframework.transaction.TransactionManager' (OnClassCondition)

原因：数据库层的mapper没有被扫描到。

解决办法：要么在mapper接口上加上@Mapper注解，要么在主启动类上加@MapperScan()。见下面。

主启动类加注解

@MapperScan(value = "com.tothefor.dao")
@SpringBootApplication
public class TtfRoomApplication {

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

}

接口加注解

package com.tothefor.dao;

import org.apache.ibatis.annotations.Mapper;

/**
 * @Author DragonOne
 * @Date 2022/8/25 13:51
 * @Title
 * @Description
 */
@Mapper
public interface TestTDao {
     int getCount();
}

复制的项目启动报错

2022年5月16日 10:57:50

在复制A项目到其他位置时，启动项目时报错如下：

Internal error (java.lang.UnsupportedOperationException): empty.min

原因

是项目的 .idea 文件夹和 .iml 文件因为路径不匹配引起的问题。

解决办法

删掉 .idea 文件夹和 .iml 文件，重新用 IDEA 打开项目，重新生成 .idea 文件夹和 .iml 文件，即可正常运行。