SpringBoot项目报错：Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.

以下方案80%可以帮助您解决这些个‘可恶的’问题

目录

报错内容和截图如下：

Connected to the target VM, address: '127.0.0.1:4963', transport: 'socket'

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::       (v2.3.10.RELEASE)

2021-12-25 14:52:41.578  INFO 13204 --- [           main] m.c.DiitMicrosoftserviceCheckApplication : Starting DiitMicrosoftserviceCheckApplication on 老云的计算机 with PID 13204 (D:\svn\workspace_nxzrbhdzt\Gh_yizhangtu\dit-check\target\classes started by liuyundashen in D:\svn\workspace_nxzrbhdzt\Gh_yizhangtu\dit-check)
2021-12-25 14:52:41.583  INFO 13204 --- [           main] m.c.DiitMicrosoftserviceCheckApplication : No active profile set, falling back to default profiles: default
2021-12-25 14:52:43.485  INFO 13204 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2021-12-25 14:52:43.503  INFO 13204 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2021-12-25 14:52:43.504  INFO 13204 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.45]
2021-12-25 14:52:43.668  INFO 13204 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2021-12-25 14:52:43.668  INFO 13204 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1979 ms
2021-12-25 14:52:43.832  INFO 13204 --- [           main] c.a.d.s.b.a.DruidDataSourceAutoConfigure : Init DruidDataSource
2021-12-25 14:52:43.910 ERROR 13204 --- [           main] com.alibaba.druid.pool.DruidDataSource   : testWhileIdle is true, validationQuery not set
2021-12-25 14:52:43.917  INFO 13204 --- [           main] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} inited
 _ _   |_  _ _|_. ___ _ |    _ 
| | |\/|_)(_| | |_\  |_)||_|_\ 
     /               |         
                        3.2.0 
2021-12-25 14:52:44.365  WARN 13204 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'cheakRecordController': Unsatisfied dependency expressed through field 'recordService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'TRecordServiceImpl': Unsatisfied dependency expressed through field 'packageService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'resultPackageBaseinfoServiceImpl': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'importDB.datasource.url' in value "${importDB.datasource.url}"
2021-12-25 14:52:44.366  INFO 13204 --- [           main] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} closing ...
2021-12-25 14:52:44.368  INFO 13204 --- [           main] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} closed
2021-12-25 14:52:44.372  INFO 13204 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2021-12-25 14:52:44.391  INFO 13204 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-12-25 14:52:44.410 ERROR 13204 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'cheakRecordController': Unsatisfied dependency expressed through field 'recordService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'TRecordServiceImpl': Unsatisfied dependency expressed through field 'packageService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'resultPackageBaseinfoServiceImpl': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'importDB.datasource.url' in value "${importDB.datasource.url}"
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1425) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:897) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE]

——在看到这些个问题的时候，日志基本都会告诉你错误的地方，所以我们大部分可以根据日志报错的信息分析错误的原因：

一、编译出问题

仔细看报出的问题，有没有如："Description：......." 这样的字眼，没有 “描述”，如上图所示，这种情况下的操作：

1.clean清理一下； 2.然后install重新编译一下 ；

3.也可以用这个命令，重新编译一下

这个时候重新启动，如果还是报同样的错误，打开如下图位置，看是否有编译的文件，如mapper.xml文件，application.yml或
者application.properties文件，以及一些配置文件等

——哎！生气，这里发现真的没有mapper和配置文件，只有main下面的.jar文件，该怎么办呢？

——pom.xml文件中给加入要编译的文件位置依赖，如下：(这是我的文件位置，你根据你的进行调整)

<!--引入本地资源-->
        <resources>
            <!--加载lib文件，特殊情况下会有lib，但大部分都靠依赖下载了-->
            <resource>
                <directory>lib</directory>
                <targetPath>BOOT-INF/lib/</targetPath>
                <includes>
                    <include>**/*.jar</include>
                </includes>
            </resource>
            <!--打jar包-->
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
            </resource>
            <!--将properties和xml文件编译-->
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>

好的，清理——>打包——>启动——>运行成功，搞定收工

二、代码格式导致得编译出问题

查看日志也是没有 "Description：......." 的内容描述，这个时候查看日志异常描述最后的内容说明，比如：

举例一：

异常说：“元素内容必须由格式正确的字符数据或标记组成”；这个时候认真检查刚才自己写下的代码，检查到Mapper.xml中有格式问题

查看：确实内容中提示错误，小于号不能直接用“<” ，而是要用“& lt；(<)或者 & gt；(>)”

举例二：NoClassDefFoundError

异常说：java.lang.NoClassDefFoundError，这种情况下应该是 org.mybatis.spring.boot 包冲突或者 org.mybatis.spring.boot 版本太低不匹配了；注释或者修改版本即可

 <!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.0</version>
        </dependency>

修改后——启动——成功

三、请求接口重复

根据日志看出它说路径问题；这样想你写的接口名字是否重复，只有一个斜杠或者没斜杠的情况

如下截图：

修改如下：

好的，重新启动，搞定收工

四、加@Mapper注解

这些情况就是看描述的问题
如图：

这种情况，看是不是没有扫描到它需要的东西，给加上@Mapper注解（是扫描dao层的），或者 加上@Service注解（扫描service层）即可。

五、加@SpringBootApplication注解，数据库问题

根据问题看出：springboot启动时会自动注入数据源和配置jpa ，解决：
在@SpringBootApplication中排除其注入
@SpringBootApplication(exclude={DataSourceAutoConfiguration.class,HibernateJpaAutoConfiguration.class})

六、端口重复问题

查看是否自己的运行端口冲突，将其kill杀死，重新启动，或者跟换端口

以下是查看端口冲突的方式：

1. window键+R，输入“netstat -aon|findstr 8080”找到占用8080端口的进程号：
   
   2.输入“tasklist|findstr "3412" ”：

   查看进程号为“3412”的进程：
   
   3.输入“taskkill /f /t /im QQ.exe”：(/f：强制性的结束进程)

   结束这个进程
   

现在可以重新启动一下，看是否运行成功

七、包冲突

还有的情况可能是包冲突了，可以将maven仓库清理一下自己的包，重新下载一下

八 、springboot 数据源配置出错

报错描述如下：

Description:
 
Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
 
Reason: Failed to determine a suitable driver class
 
 
Action:
 
Consider the following:
	If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
	If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).

1、yml 和 启动类中配置出问题(pom文件中配置了druid)

此处配置了druid，在启动类中则不能写成以下形式

@SpringBootApplication({exclude = {DruidDataSourceAutoConfigure.class} )

只能写成，或者删除yml中的Druid配置

@SpringBootApplication

2、yml中没有配置druid

则启动类写成以下形式，(pom文件中配置了druid)

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)//排除自动配置

程序入口处:
 
@SpringBootApplication
public class DemoApplication {
 
修改为:
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
public class DemoApplication {

3、解决方案
如果以上方法不行那就，将pom文件带有数据库相关的删除，例如：jdbc、mysql-connect等等

此方法原文链接

希望可以帮助到您

~感谢您的光临~

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