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關(guān)于Maven依賴沖突解決之exclusions

 更新時間：2021年12月21日 08:58:34   作者：聞香識代碼  
這篇文章主要介紹了關(guān)于Maven依賴沖突解決之exclusions用法，具有很好的參考價值，希望對大家有所幫助。如有錯誤或未考慮完全的地方，望不吝賜教

Maven依賴沖突解決之exclusions

1. 背景

  • 作為java生態(tài)下開發(fā)者，往往需要使用大量線程的第三方庫，一般都是以jar包形式存在。
  • maven作為事實上主流的jar包依賴管理工具，Idea和Eclipse都支持創(chuàng)建maven工程來管理jar包依賴。
  • 使用maven進行jar包依賴管理時，maven會自行管理jar包及其依賴鏈條，但往往會遇到依賴沖突問題，這時候就可以嘗試使用exclusion來進行依賴管理。

2. 解決方式

場景

在這里插入圖片描述

假如hadoop集群中hadoop版本是3.2.1，這時候為了保證程序能夠順利操作hadoop，需要引入hadoop-client的3.2.1版本。但這里也可以看到，spark-core_2.12內(nèi)部也有對hadoop-client的依賴，而且版本是低版本的2.7.4，這時候往往就會產(chǎn)生沖突或者未知錯誤。所以需要使用exclusions做依賴排除。

解決方式

使用exclusions來對某一個第三方庫引入的依賴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>

在這里插入圖片描述

Maven解決依賴沖突總結(jié)

如果存在jar包的依賴沖突，在項目啟動時總是報類似這樣的錯：NoSuchMethodError、ClassNotFoundException、成員變量找不到等等。真的很讓人不好受。

Maven采用的是“最近獲勝的策略”來處理依賴的沖突，即如果一個項目最終依賴于相同artifact的多個版本，在依賴樹中離項目最近的那個版本將被使用。讓我們來看看一個實際的例子。

實例分析

我們有一個web應(yīng)用resolve-web，該工程依賴于project-A和project-B，project-A依賴于project-common的1.0版本并調(diào)用其中的sayHello()方法。project-B依賴于project-C，而project-C又進一步依賴于project-common的2.0版本并調(diào)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()兩個方法。整個項目的依賴關(guān)系如下圖：

根據(jù)Maven的最近原則依賴機制，resolve-web將同時依賴于project-common的1.0和2.0版本，這就造成了依賴沖突。而根據(jù)最近獲勝策略，Maven將選擇project-common的1.0版本作為最終的依賴。這和Gradle不同，Gradle在默認(rèn)情況下將選擇最新的版本作為獲勝版本。而對于Maven，由于proejct-common的1.0版本比2.0版本在依賴樹中離resolve-web更近，故1.0版本獲勝。在resolve-web中執(zhí)行"mvn dependency:tree -Dverbose"可以看到resolve-web的依賴關(guān)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。此時在resolve-web的war包中將只包含project-common的1.0版本，于是問題來了。由于project-common的1.0版本中不包含sayGoodBye()方法，而該方法正是project-C所需要的，所以運行時將出現(xiàn)“NoSuchMethodError”。

解決辦法

方法1：顯式加入對project-common 2.0版本的依賴。先前的2.0版本不是離resolve-web遠(yuǎn)了點嗎，那我們就直接將它作為resolve-web的依賴，這不就比1.0版本離resolve-web還近嗎？在resove-web的pom.xml文件中直接加上對project-common 2.0 的依賴

<dependency>       
   <groupId>project-common</groupId>      
   <artifactId>project-commmon</artifactId>  
   <version>2.0</version>   
</dependency>

方法2：resolve-web對project-A的dependency聲明中，將project-common排除掉。在resolve-web的pom.xml文件中修改對project-A的dependency聲明

<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>

此時再在resolve-web中執(zhí)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
 
......

這樣的話，就可以完美解決沖突了。

命令分析

這里我們對我們執(zhí)行的命令做一個簡單的說明。

mvn dependency:tree -Dverbose -Dincludes=<groupId>:<artifactId>

1、第一部分mvn dependency:tree是maven依賴的分析命令，作用是對我們的項目的依賴進行分析，并輸出項目依賴樹

2、第二部分-Dverbose的作用是添加了verbose一個環(huán)境變量，起的作用是在分析項目依賴時輸出明細(xì)，這樣項目中依賴的所有3、引用都會被輸出出來，包含了所有的間接引用，會有很多很多，我們只需要我們要找的，所以就需要第三個參數(shù)了第三部分-Dincludes=<groupId>:<artifactId>的作用就是進行過濾，只包含我們想要的依賴的依賴時，排除掉其它不需要的，依賴樹的所有葉子節(jié)點就是我們的找的依賴包。其中的groupId和artifactId可以只填寫一個，為了保證準(zhǔn)確性，一般都會填兩個（填寫時不包括尖括號）。

小試牛刀

在自己的項目上，啟動時發(fā)現(xiàn)如下異常：

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 WebApplicationContext
21-Mar-2019 15:52:08.905 嚴(yán)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)

執(zhí)行命令分析下，項目的jar包的依賴情況，只過濾并分析spring框架的jar包依賴樹情況，使用的命令如下：

mvn dependency:tree -Dverbose -Dincludes=org.springframework:

在新引入的項目jar包中，發(fā)現(xiàn)其再次引入了spring的相關(guān)包并且該spring包的層級屬于第二層級，實際已有的spring的包處在第三或者第四層級，根據(jù)就近原則，低版本的3.2.5的jar包覆蓋了高版本的jar包，導(dǎo)致出現(xiàn)找不到某變量的異常。剔除這些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包的依賴樹：

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$

實際上，對于omitted for duplicate的提示，我們可以不用去解決，只是提示了該包的重復(fù)定義。在實際情況上，更多的是根據(jù)就近原則引用了一個低版本的jar包，這樣本身高版本的Jar包包含的方法，在低版本卻沒有，導(dǎo)致項目在調(diào)用時，出現(xiàn)了“方法找不到”類似的異常信息。

以上為個人經(jīng)驗，希望能給大家一個參考，也希望大家多多支持腳本之家。

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