问题一(org.apache.ibatis.session.Configuration)

# Correct the classpath of your application so that it contains a single, compatible version of org.apache.ibatis.session.Configuration

解决方法

原因：版本不兼容
解决方法：修改mybatis-3.4.5版本

如果有mybatis-spring-boot-starter依赖，里面是版本比较低，需要用mybatis来替换

<!-- 覆盖掉mybatis-spring-boot-starter中的低版本 -->
<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis</artifactId>
  <version>3.4.5</version>
</dependency>
<!--缺少此jar包，导致@Mapper注解无效-->
<dependency>
  <groupId>org.mybatis.spring.boot</groupId>
  <artifactId>mybatis-spring-boot-starter</artifactId>
  <version>2.1.3</version>
  <exclusions>
    <exclusion>
      <artifactId>spring-boot-starter</artifactId>
      <groupId>org.springframework.boot</groupId>
    </exclusion>
  </exclusions>
</dependency>

问题二(ERROR StatusLogger No log4j2)

# log4j报错：ERROR StatusLogger No log4j2 configuration file found. Using default configuration

解决方法

1. 查看配置文件中是否加入了配置
		logging.config=classpath:log4j2.yml
2. 查看是否加入了适配yml文件的依赖
<!-- 适配yml文件 -->
<dependency>
  <groupId>com.fasterxml.jackson.dataformat</groupId>
  <artifactId>jackson-dataformat-yaml</artifactId>
  <version>2.14.2</version>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.14.2</version>
</dependency>
<dependency>
  <groupId>org.yaml</groupId>
  <artifactId>snakeyaml</artifactId>
  <version>2.0</version>
</dependency>

问题三(com.google.common.util.concurrent)

# NoSuchMethodError: com.google.common.util.concurrent.MoreExecutors.sameThreadExecutor

解决方法

依赖冲突，查看maven依赖

问题四(start bean ‘documentationPluginsBootstrapper’)

# org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException

解决方法

# Spring Boot 版本和swagger版本不一致的情况导致的
Spring Boot版本	    2.5.6
Swagger 版本        2.9.2

或者

Spring Boot版本	    2.6.5
Swagger 版本        3.0.0

问题五(Unable to infer base url. )

# Unable to infer base url. This is common when using dynamic servlet registration or when the API is behind an API Gateway. The base url is the root of where all the swagger resources are served. For e.g. if the api is available at http://example.org/api/v2/api-docs then the base url is http://example.org/api/. Please enter the location manually: 

解决办法

# 需要开启swagger
@EnableSwagger2

问题六(no active profile set)

# spring boot profile配置和启动时no active profile set, falling back to default profiles: default的问题

# 在application.properties中加入如何配置·
在application.properties中写上spring.profiles.active=dev

解决办法

问题七(org/springframework/transaction/ReactiveTransactionManager)

# NoClassDefFoundError: org/springframework/transaction/ReactiveTransactionManager

解决方法

需要查看spring-boot依赖是否重复

问题八(com.fasterxml.jackson.databind)

# java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.ser.std.ToStringSerializerBase

解决方法

版本较低出现问题，换高版本就可以了

问题九(must be “pom” but is “jar”)

# maven的pom文件报错： must be "pom" but is "jar"

解决方法

parent工程的pom.xml文件的project节点下加入如下节点

<packaging>pom</packaging>

问题十(For input string: “”)

# Illegal DefaultValue null for parameter type integer和NumberFormatException: For input string: ""

<!-- swagger依赖添加 -->
<dependency>
  <groupId>io.springfox</groupId>
  <artifactId>springfox-swagger2</artifactId>
  <exclusions>
    <!--移除swagger-models 1.5.20 依赖，存在Swagger2异常:Illegal DefaultValue null for parameter type integer问题-->
    <exclusion>
      <groupId>io.swagger</groupId>
      <artifactId>swagger-annotations</artifactId>
    </exclusion>
    <exclusion>
      <groupId>io.swagger</groupId>
      <artifactId>swagger-models</artifactId>
    </exclusion>
    <exclusion>
      <artifactId>spring-beans</artifactId>
      <groupId>org.springframework</groupId>
    </exclusion>
  </exclusions>
</dependency>

问题十一(com/fasterxml/jackson/databind/JsonNode)

# java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/JsonNode

解决方法

Jackson包版本冲突导致