Caused by: java.lang.ClassNotFoundException: org.springframework.boot.autoconfigure.jdbc.metadata.Da

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#DataSourcePoolMetadataProvider #ClassNotFoundException

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SpringBoot从1.5.9升级到2.X版本的时候出现如下错误

Caused by: java.lang.ClassNotFoundException: org.springframework.boot.autoconfigure.jdbc.metadata.DataSourcePoolMetadataProvider

具体的栈信息：

java.lang.IllegalStateException: Failed to load ApplicationContext

	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:125)
	at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:108)
	at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:190)
	at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:132)
	at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:246)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:227)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:246)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: java.lang.IllegalStateException: Error processing condition on org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$PooledDataSourceConfiguration
	at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:60)
	at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:108)
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader$TrackedConditionEvaluator.shouldSkip(ConfigurationClassBeanDefinitionReader.java:447)
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader$TrackedConditionEvaluator.shouldSkip(ConfigurationClassBeanDefinitionReader.java:436)
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:128)
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:117)
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:327)
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:232)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:95)
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:705)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:531)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:744)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:391)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:312)
	at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:120)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:117)
	... 24 more
Caused by: java.lang.IllegalStateException: Failed to introspect Class [com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure] from ClassLoader [sun.misc.Launcher$AppClassLoader@18b4aac2]
	at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:507)
	at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:404)
	at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:389)
	at org.springframework.util.ReflectionUtils.getUniqueDeclaredMethods(ReflectionUtils.java:447)
	at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1688)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryMethod(AbstractAutowireCapableBeanFactory.java:738)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineTargetType(AbstractAutowireCapableBeanFactory.java:679)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:647)
	at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1518)
	at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1023)
	at org.springframework.boot.autoconfigure.condition.BeanTypeRegistry.addBeanTypeForNonAliasDefinition(BeanTypeRegistry.java:189)
	at org.springframework.boot.autoconfigure.condition.BeanTypeRegistry.addBeanTypeForNonAliasDefinition(BeanTypeRegistry.java:156)
	at org.springframework.boot.autoconfigure.condition.BeanTypeRegistry.addBeanType(BeanTypeRegistry.java:149)
	at org.springframework.boot.autoconfigure.condition.BeanTypeRegistry.updateTypesIfNecessary(BeanTypeRegistry.java:137)
	at java.util.Iterator.forEachRemaining(Iterator.java:116)
	at org.springframework.boot.autoconfigure.condition.BeanTypeRegistry.updateTypesIfNecessary(BeanTypeRegistry.java:132)
	at org.springframework.boot.autoconfigure.condition.BeanTypeRegistry.getNamesForType(BeanTypeRegistry.java:96)
	at org.springframework.boot.autoconfigure.condition.OnBeanCondition.collectBeanNamesForType(OnBeanCondition.java:269)
	at org.springframework.boot.autoconfigure.condition.OnBeanCondition.getBeanNamesForType(OnBeanCondition.java:262)
	at org.springframework.boot.autoconfigure.condition.OnBeanCondition.getBeanNamesForType(OnBeanCondition.java:251)
	at org.springframework.boot.autoconfigure.condition.OnBeanCondition.getMatchingBeans(OnBeanCondition.java:171)
	at org.springframework.boot.autoconfigure.condition.OnBeanCondition.getMatchOutcome(OnBeanCondition.java:145)
	at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:47)
	... 41 more
Caused by: java.lang.NoClassDefFoundError: org/springframework/boot/autoconfigure/jdbc/metadata/DataSourcePoolMetadataProvider
	at java.lang.Class.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
	at java.lang.Class.getDeclaredMethods(Class.java:1975)
	at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:489)
	... 63 more
Caused by: java.lang.ClassNotFoundException: org.springframework.boot.autoconfigure.jdbc.metadata.DataSourcePoolMetadataProvider
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 67 more

出现如下错误的原因SpringBoot的版本不同，相应的配置文件也会略有改动，下面原版本的配置：

spring:
    datasource:
        # 数据库访问配置, 使用druid数据源
        driver-class-name: com.mysql.cj.jdbc.Driver
        type: com.alibaba.druid.pool.DruidDataSource
        url: jdbc:mysql://XXX:3306/zeroyuanlottery?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC&useSSL=false
        username:。。。 
        password: 。。。
        druid:
            # 连接池配置
            initial-size: 5
            min-idle: 5
            max-active: 20
            # 连接等待超时时间
            max-wait: 30000
            # 配置检测可以关闭的空闲连接间隔时间
            time-between-eviction-runs-millis: 60000
            # 配置连接在池中的最小生存时间
            min-evictable-idle-time-millis: 300000
            validation-query: select '1' from dual
            test-while-idle: true
            test-on-borrow: false
            test-on-return: false
            # 打开PSCache，并且指定每个连接上PSCache的大小
            pool-prepared-statements: true
            max-open-prepared-statements: 20
            max-pool-prepared-statement-per-connection-size: 20
            # 配置监控统计拦截的filters, 去掉后监控界面sql无法统计, 'wall'用于防火墙
            filters: stat,wall
            # Spring监控AOP切入点，如x.y.z.service.*,配置多个英文逗号分隔
            aop-patterns: com.chun.zeroyuanlottery.servie.*


            # WebStatFilter配置
            web-stat-filter:
                enabled: true
                # 添加过滤规则
                url-pattern: /*
                # 忽略过滤的格式
                exclusions: '*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*'

            # StatViewServlet配置
            stat-view-servlet:
                enabled: true
                # 访问路径为/druid时，跳转到StatViewServlet
                url-pattern: /druid/*
                # 是否能够重置数据
                reset-enable: false
                # 需要账号密码才能访问控制台
                login-username: root
                login-password: 123456
                # IP白名单
                # allow: 127.0.0.1
                #　IP黑名单（共同存在时，deny优先于allow）
                # deny: 192.168.1.218

            # 配置StatFilter
            filter:
                stat:
                    log-slow-sql: true

在不想降级的条件下，需要修改写配置，本人的错误原因是driver-class-name不再支持com.mysql.cj.jdbc.Driver了，下面是修改：com.mysql.jdbc.Driver。除此之外，还有其他的配置的位置也略有改动。

datasource:
        # 数据库访问配置, 使用druid数据源
        driver-class-name: com.mysql.jdbc.Driver
        type: com.alibaba.druid.pool.DruidDataSource
        url: jdbc:mysql://XXXX:3306/zeroyuanlottery?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC&useSSL=false
        username: 。。。
        password: 。。。
        druid:
            # 连接池配置
            initial-size: 5
            min-idle: 5
            max-active: 20
            # 连接等待超时时间
            max-wait: 30000
            # 配置检测可以关闭的空闲连接间隔时间
            time-between-eviction-runs-millis: 60000
            # 配置连接在池中的最小生存时间
            min-evictable-idle-time-millis: 300000
            validation-query: select '1' from dual
            test-while-idle: true
            test-on-borrow: false
            test-on-return: false
            # 打开PSCache，并且指定每个连接上PSCache的大小
            pool-prepared-statements: true
            max-open-prepared-statements: 20
            max-pool-prepared-statement-per-connection-size: 20
            # 配置监控统计拦截的filters, 去掉后监控界面sql无法统计, 'wall'用于防火墙
            filters: stat,wall
            # Spring监控AOP切入点，如x.y.z.service.*,配置多个英文逗号分隔
            aop-patterns: com.chun.zeroyuanlottery.servie.*


            # WebStatFilter配置
            web-stat-filter:
                enabled: true
                # 添加过滤规则
                url-pattern: /*
                # 忽略过滤的格式
                exclusions: '*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*'

            # StatViewServlet配置
            stat-view-servlet:
                enabled: true
                # 访问路径为/druid时，跳转到StatViewServlet
                url-pattern: /druid/*
                # 是否能够重置数据
                reset-enable: false
                # 需要账号密码才能访问控制台
                login-username: root
                login-password: 123456
                # IP白名单
                # allow: 127.0.0.1
                #　IP黑名单（共同存在时，deny优先于allow）
                # deny: 192.168.1.218

            # 配置StatFilter
            filter:
                stat:
                    log-slow-sql: true