目录Maven依赖冲突解决之exclusions1. 背景2. 解决方式场景解决方式Maven解决依赖冲突总结实例分析解决办法命令分析小试牛刀
Maven依赖冲突解决之exclusions
1. 背景 作为java生态下开发者，往往需要使用大量线程的第三方库，一般都是以jar包形式存在。 maven作为事实上主流的jar包依赖管理工具，Idea和Eclipse都支持创建maven工程来管理jar包依赖。 使用maven进行jar包依赖管理时，maven会自行管理jar包及其依赖链条，但往往会遇到依赖冲突问题，这时候就可以尝试使用exclusion来进行依赖管理。
2. 解决方式
场景
假如hadoop集群中hadoop版本是3.2.1，这时候为了保证程序能够顺利操作hadoop，需要引入hadoop-client的3.2.1版本。但这里也可以看到，spark-core_2.12内部也有对hadoop-client的依赖，而且版本是低版本的2.7.4，这时候往往就会产生冲突或者未知错误。所以需要使用exclusions做依赖排除。
解决方式
使用exclusions来对某一个第三方库引入的依赖jar包做排除
<dependency> <groupId>org.apache.spark</groupId> <artifactId>spark-core_2.12</artifactId> <version>${spark.version}</version> <exclusions> <exclusion> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-client</artifactId> </exclusion> <exclusion> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> </exclusion> </exclusions> </dependency>
Maven解决依赖冲突总结
如果存在jar包的依赖冲突，在项目启动时总是报类似这样的错：NoSuchMethodError、ClassNotFoundException、成员变量找不到等等。真的很让人不好受。
Maven采用的是“最近获胜的策略”来处理依赖的冲突，即如果一个项目最终依赖于相同artifact的多个版本，在依赖树中离项目最近的那个版本将被使用。让我们来看看一个实际的例子。
实例分析
我们有一个web应用resolve-web，该工程依赖于project-A和project-B，project-A依赖于project-common的1.0版本并调用其中的sayHello()方法。project-B依赖于project-C，而project-C又进一步依赖于project-common的2.0版本并调用其中的sayGoodBye()方法。project-common的1.0和2.0版本是不同的，1.0中之包含sayHello()方法，而2.0中包含了sayHello()和sayGoodBye()两个方法。整个项目的依赖关系如下图：
根据Maven的最近原则依赖机制，resolve-web将同时依赖于project-common的1.0和2.0版本，这就造成了依赖冲突。而根据最近获胜策略，Maven将选择project-common的1.0版本作为最终的依赖。这和Gradle不同，Gradle在默认情况下将选择最新的版本作为获胜版本。而对于Maven，由于proejct-common的1.0版本比2.0版本在依赖树中离resolve-web更近，故1.0版本获胜。在resolve-web中执行”mvn dependency:tree -Dverbose”可以看到resolve-web的依赖关系：
[INFO] resolve-web:resolve-web:war:1.0-SNAPSHOT [INFO] +- junit:junit:jar:3.8.1:test [INFO] +- project-B:project-B:jar:1.0:compile [INFO] | \- project-C:project-C:jar:1.0:compile [INFO] | \- (project-common:project-commmon:jar:2.0:compile - omitted for conflict with 1.0) [INFO] +- project-A:project-A:jar:1.0:compile [INFO] | \- project-common:project-commmon:jar:1.0:compile [INFO] \- javax.servlet:servlet-api:jar:2.4:provided
由上可知，project-common:project-commmon:jar:2.0被忽略掉了。此时在resolve-web的war包中将只包含project-common的1.0版本，于是问题来了。由于project-common的1.0版本中不包含sayGoodBye()方法，而该方法正是project-C所需要的，所以运行时将出现“NoSuchMethodError”。
解决办法
方法1：显式加入对project-common 2.0版本的依赖。先前的2.0版本不是离resolve-web远了点吗，那我们就直接将它作为resolve-web的依赖，这不就比1.0版本离resolve-web还近吗？在resove-web的pom.xml文件中直接加上对project-common 2.0 的依赖
<dependency> <groupId>project-common</groupId> <artifactId>project-commmon</artifactId> <version>2.0</version> </dependency>
方法2：resolve-web对project-A的dependency声明中，将project-common排除掉。在resolve-web的pom.xml文件中修改对project-A的dependency声明
<dependency> <groupId>project-A</groupId> <artifactId>project-A</artifactId> <version>1.0</version> <exclusions> <exclusion> <groupId>project-common</groupId> <artifactId>project-commmon</artifactId> </exclusion> </exclusions> </dependency>
此时再在resolve-web中执行”mvn dependency:tree -Dverbose”，如下：
...... [INFO] resolve-web:resolve-web:war:1.0-SNAPSHOT [INFO] +- junit:junit:jar:3.8.1:test [INFO] +- project-B:project-B:jar:1.0:compile [INFO] | \- project-C:project-C:jar:1.0:compile [INFO] | \- project-common:project-commmon:jar:2.0:compile [INFO] +- project-A:project-A:jar:1.0:compile [INFO] \- javax.servlet:servlet-api:jar:2.4:provided ......
这样的话，就可以完美解决冲突了。
命令分析
这里我们对我们执行的命令做一个简单的说明。
mvn dependency:tree -Dverbose -Dincludes=<groupId>:<artifactId>
1、第一部分mvn dependency:tree是maven依赖的分析命令，作用是对我们的项目的依赖进行分析，并输出项目依赖树
2、第二部分-Dverbose的作用是添加了verbose一个环境变量，起的作用是在分析项目依赖时输出明细，这样项目中依赖的所有3、引用都会被输出出来，包含了所有的间接引用，会有很多很多，我们只需要我们要找的，所以就需要第三个参数了第三部分-Dincludes=<groupId>:<artifactId>的作用就是进行过滤，只包含我们想要的依赖的依赖时，排除掉其它不需要的，依赖树的所有叶子节点就是我们的找的依赖包。其中的groupId和artifactId可以只填写一个，为了保证准确性，一般都会填两个（填写时不包括尖括号）。
小试牛刀
在自己的项目上，启动时发现如下异常：
21-Mar-2019 15:51:33.527 信息 [RMI TCP Connection(2)-127.0.0.1] org.apache.catalina.core.ApplicationContext.log Initializing Spring root WebApplicationContext21-Mar-2019 15:52:08.905 严重 [RMI TCP Connection(2)-127.0.0.1] org.apache.catalina.core.StandardContext.listenerStart Exception sending context initialized event to listener instance of class [org.springframework.web.context.ContextLoaderListener]org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘org.springframework.web.socket.server.support.WebSocketHandlerMapping#0’: Cannot resolve reference to bean ‘org.springframework.web.socket.sockjs.support.SockJsHttpRequestHandler#0’ while setting bean property ‘urlMap’ with key [/websocket/**]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘org.springframework.web.socket.sockjs.support.SockJsHttpRequestHandler#0’: Cannot resolve reference to bean ‘org.springframework.web.socket.sockjs.transport.handler.DefaultSockJsService#0’ while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘org.springframework.web.socket.sockjs.transport.handler.DefaultSockJsService#0’: Cannot resolve reference to bean ‘SockJsScheduler’ while setting constructor argument; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘SockJsScheduler’: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property ‘removeOnCancelPolicy’ of bean class [org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler]: Bean property ‘removeOnCancelPolicy’ is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:359)at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:108)at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveManagedMap(BeanDefinitionValueResolver.java:407)at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:165)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1531)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1276)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:443)at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:325)at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4817)at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5283)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:754)at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:730)at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1736)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:483)at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:432)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468)at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)at java.security.AccessController.doPrivileged(Native Method)at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1408)at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)at sun.rmi.transport.Transport$1.run(Transport.java:200)at sun.rmi.transport.Transport$1.run(Transport.java:197)at java.security.AccessController.doPrivileged(Native Method)at sun.rmi.transport.Transport.serviceCall(Transport.java:196)at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834)at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)at java.security.AccessController.doPrivileged(Native Method)at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)at java.lang.Thread.run(Thread.java:748)
执行命令分析下，项目的jar包的依赖情况，只过滤并分析spring框架的jar包依赖树情况，使用的命令如下：
mvn dependency:tree -Dverbose -Dincludes=org.springframework:
在新引入的项目jar包中，发现其再次引入了spring的相关包并且该spring包的层级属于第二层级，实际已有的spring的包处在第三或者第四层级，根据就近原则，低版本的3.2.5的jar包覆盖了高版本的jar包，导致出现找不到某变量的异常。剔除这些jar包如下配置：
<exclusion> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId></exclusion><exclusion> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId></exclusion><exclusion> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId></exclusion>
重新查看jar包的依赖树：
xujiaqingdeMacBook-Pro:mos jaycee$ mvn dependency:tree -Dverbose -Dincludes=org.springframework:[WARNING] [WARNING] Some problems were encountered while building the effective settings[WARNING] Unrecognised tag: 'mirror' (position: START_TAG seen ...e the preferred\n | server for that repository.\n |-->\n <mirror>... @153:10) @ /software/apache-maven-3.6.0/conf/settings.xml, line 153, column 10[WARNING] [INFO] Scanning for projects...[WARNING] [WARNING] Some problems were encountered while building the effective model for fish:core-db:jar:1.0-SNAPSHOT[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-compiler-plugin is missing. @ fish:core-db:[unknown-version], /projects/mos/core-db/pom.xml, line 79, column 21[WARNING] [WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.[WARNING] [WARNING] For this reason, future Maven versions might no longer support building such malformed projects.[WARNING] [INFO] ------------------------------------------------------------------------[INFO] Reactor Build Order:[INFO] [INFO] FishParent [pom][INFO] core-db [jar][INFO] core [war][INFO] [INFO] --------------------------< fish:FishParent >---------------------------[INFO] Building FishParent 1.0-SNAPSHOT [1/3][INFO] --------------------------------[ pom ]---------------------------------[INFO] [INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ FishParent ---[INFO] [INFO] ----------------------------< fish:core-db >----------------------------[INFO] Building core-db 1.0-SNAPSHOT [2/3][INFO] --------------------------------[ jar ]---------------------------------[INFO] [INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ core-db ---[INFO] fish:core-db:jar:1.0-SNAPSHOT[INFO] \- com.hand:hap-db:jar:3.5.4-RELEASE:compile[INFO] \- com.hand:hap-core-db:jar:3.5.4-RELEASE:compile[INFO] \- org.springframework:spring-core:jar:4.3.11.RELEASE:compile[INFO] [INFO] -----------------------------< fish:core >------------------------------[INFO] Building core 1.0-SNAPSHOT [3/3][INFO] --------------------------------[ war ]---------------------------------[INFO] [INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ core ---[INFO] fish:core:war:1.0-SNAPSHOT[INFO] +- com.hand:hap-db:jar:3.5.4-RELEASE:compile[INFO] | \- com.hand:hap-core-db:jar:3.5.4-RELEASE:compile[INFO] | \- org.springframework:spring-core:jar:4.3.11.RELEASE:compile[INFO] +- com.hand:hap-pom:pom:3.5.4-RELEASE:provided[INFO] | +- com.hand:hap-core:jar:classes:3.5.4-RELEASE:provided[INFO] | | +- (org.springframework:spring-core:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | +- org.springframework:spring-jdbc:jar:4.3.11.RELEASE:provided[INFO] | | | +- org.springframework:spring-beans:jar:4.3.11.RELEASE:provided[INFO] | | | | \- (org.springframework:spring-core:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | +- (org.springframework:spring-core:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | \- (org.springframework:spring-tx:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | +- org.springframework:spring-test:jar:4.3.11.RELEASE:provided[INFO] | | | \- (org.springframework:spring-core:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | +- org.springframework:spring-context:jar:4.3.11.RELEASE:provided[INFO] | | | +- org.springframework:spring-aop:jar:4.3.11.RELEASE:provided[INFO] | | | | +- (org.springframework:spring-beans:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | | \- (org.springframework:spring-core:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | +- (org.springframework:spring-beans:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | +- (org.springframework:spring-core:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | \- org.springframework:spring-expression:jar:4.3.11.RELEASE:provided[INFO] | | | \- (org.springframework:spring-core:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | +- org.springframework:spring-context-support:jar:4.3.11.RELEASE:provided[INFO] | | | +- (org.springframework:spring-beans:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | +- (org.springframework:spring-context:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | \- (org.springframework:spring-core:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | +- org.springframework:spring-web:jar:4.3.11.RELEASE:provided[INFO] | | | +- (org.springframework:spring-aop:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | +- (org.springframework:spring-beans:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | +- (org.springframework:spring-context:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | \- (org.springframework:spring-core:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | +- org.springframework:spring-webmvc:jar:4.3.11.RELEASE:provided[INFO] | | | +- (org.springframework:spring-aop:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | +- (org.springframework:spring-beans:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | +- (org.springframework:spring-context:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | +- (org.springframework:spring-core:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | +- (org.springframework:spring-expression:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | \- (org.springframework:spring-web:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | +- org.springframework.data:spring-data-redis:jar:1.7.0.RELEASE:provided[INFO] | | | +- org.springframework.data:spring-data-keyvalue:jar:1.1.0.RELEASE:provided[INFO] | | | | +- org.springframework.data:spring-data-commons:jar:1.12.0.RELEASE:provided[INFO] | | | | | +- (org.springframework:spring-core:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | | | \- (org.springframework:spring-beans:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | | +- (org.springframework:spring-context:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | | \- (org.springframework:spring-tx:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- (org.springframework:spring-tx:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- org.springframework:spring-oxm:jar:4.2.5.RELEASE:provided[INFO] | | | | +- (org.springframework:spring-beans:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | | \- (org.springframework:spring-core:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- (org.springframework:spring-aop:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | \- (org.springframework:spring-context-support:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | +- org.springframework.security:spring-security-web:jar:4.0.4.RELEASE:provided[INFO] | | | +- org.springframework.security:spring-security-core:jar:4.0.4.RELEASE:provided[INFO] | | | | +- (org.springframework:spring-aop:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | | +- (org.springframework:spring-beans:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | | +- (org.springframework:spring-context:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | | +- (org.springframework:spring-core:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | | \- (org.springframework:spring-expression:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- (org.springframework:spring-beans:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- (org.springframework:spring-context:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- (org.springframework:spring-core:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- (org.springframework:spring-expression:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | \- (org.springframework:spring-web:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | +- org.springframework.security:spring-security-config:jar:4.0.4.RELEASE:provided[INFO] | | | +- (org.springframework:spring-aop:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- (org.springframework:spring-beans:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- (org.springframework:spring-context:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | \- (org.springframework:spring-core:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | +- org.springframework.security:spring-security-cas:jar:4.0.4.RELEASE:provided[INFO] | | | +- (org.springframework:spring-beans:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- (org.springframework:spring-context:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- (org.springframework:spring-core:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | \- (org.springframework:spring-web:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | +- org.springframework.security.oauth:spring-security-oauth2:jar:2.0.7.RELEASE:provided[INFO] | | | +- (org.springframework:spring-beans:jar:4.0.9.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- (org.springframework:spring-core:jar:4.0.9.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- (org.springframework:spring-context:jar:4.0.9.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | \- (org.springframework:spring-webmvc:jar:4.0.9.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | +- org.springframework.security:spring-security-ldap:jar:4.0.4.RELEASE:provided[INFO] | | | +- (org.springframework:spring-beans:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- (org.springframework:spring-context:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- (org.springframework:spring-core:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | \- (org.springframework:spring-tx:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | +- com.ryantenney.metrics:metrics-spring:jar:3.1.3:provided[INFO] | | | \- (org.springframework:spring-context-support:jar:4.1.6.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | +- org.springframework.amqp:spring-rabbit:jar:1.7.1.RELEASE:provided[INFO] | | | +- (org.springframework:spring-web:jar:4.3.7.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- (org.springframework:spring-messaging:jar:4.3.7.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- org.springframework.amqp:spring-amqp:jar:1.7.1.RELEASE:provided[INFO] | | | | \- (org.springframework:spring-core:jar:4.3.7.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | +- (org.springframework:spring-tx:jar:4.3.7.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | \- (org.springframework:spring-context:jar:4.3.7.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | +- org.springframework:spring-websocket:jar:4.3.11.RELEASE:provided[INFO] | | | +- (org.springframework:spring-context:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | +- (org.springframework:spring-core:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | | \- (org.springframework:spring-web:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | \- org.springframework:spring-messaging:jar:4.3.11.RELEASE:provided[INFO] | | +- (org.springframework:spring-beans:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | +- (org.springframework:spring-context:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | | \- (org.springframework:spring-core:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | +- com.hand:hap-workflow:jar:classes:3.5.4-RELEASE:provided[INFO] | | +- org.activiti:activiti-spring:jar:6.0.0:provided[INFO] | | | +- (org.springframework:spring-context:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | | \- (org.springframework:spring-jdbc:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | \- org.activiti:activiti-rest:jar:6.0.0:provided[INFO] | | +- (org.springframework:spring-context:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | | \- (org.springframework:spring-webmvc:jar:4.2.5.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] | \- com.hand:hap-report:jar:classes:3.5.4-RELEASE:provided[INFO] | \- com.bstek.ureport:ureport2-console:jar:2.2:provided[INFO] | \- com.bstek.ureport:ureport2-core:jar:2.2:provided[INFO] | +- (org.springframework:spring-web:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | \- (org.springframework:spring-jdbc:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] \- hscs:core:jar:classes:2.2.1-SNAPSHOT:provided[INFO] \- org.springframework.kafka:spring-kafka:jar:1.3.0.RELEASE:provided[INFO] +- (org.springframework:spring-messaging:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] +- org.springframework:spring-tx:jar:4.3.11.RELEASE:provided[INFO] | +- (org.springframework:spring-beans:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] | \- (org.springframework:spring-core:jar:4.3.11.RELEASE:provided - omitted for duplicate)[INFO] \- org.springframework.retry:spring-retry:jar:1.2.0.RELEASE:provided[INFO] \- (org.springframework:spring-core:jar:4.3.3.RELEASE:provided - omitted for conflict with 4.3.11.RELEASE)[INFO] ------------------------------------------------------------------------[INFO] Reactor Summary for FishParent 1.0-SNAPSHOT:[INFO] [INFO] FishParent ......................................... SUCCESS [ 0.922 s][INFO] core-db ............................................ SUCCESS [ 0.539 s][INFO] core ............................................... SUCCESS [ 4.020 s][INFO] ------------------------------------------------------------------------[INFO] BUILD SUCCESS[INFO] ------------------------------------------------------------------------[INFO] Total time: 5.780 s[INFO] Finished at: 2019-03-21T15:38:44+08:00[INFO] ------------------------------------------------------------------------xujiaqingdeMacBook-Pro:mos jaycee$
实际上，对于omitted for duplicate的提示，我们可以不用去解决，只是提示了该包的重复定义。在实际情况上，更多的是根据就近原则引用了一个低版本的jar包，这样本身高版本的Jar包包含的方法，在低版本却没有，导致项目在调用时，出现了“方法找不到”类似的异常信息。
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。
【本文由：阿里云代理 http://www.56aliyun.com 复制请保留原URL】生命不息，奋斗不止，就像我们常说的一句话；
