Maven 项目无缘无故报错：版本冲突，其他机器上正常-提交的时候报冲突怎么也解决不掉

2018年：

maven突然之间报错了，显示版本冲突，但是其他的机器是好的，

使用命令：mvn compile -P dev -e;

看看测试环境有没有问题，还是有问题。而且，刚开始只是报错：error,连错误原因都不提。

后来把原来的项目删掉，然后执行：mvn compile -P dev -e

开始出现错误的原因了，说是：com.sankuai.qcs 底下的某个包引用冲突。

后来找到这个包的本地仓库的位置： /Users/yinfuqing/.m2/repository/com/sankuai/qcs

把这个qcs的包整个删掉，这样下次编译的时候，发现本地没有，会先从服务器下载下来，然后在引用。

执行：mvn compile -P dev -e ,编译通过了；

2019年又碰上了，我的方法最终是先把自己做的备份。然后把本地的项目全部删除，在重新下载就好了。

2019 -03-05

又出现了版本冲突，我发现个问题，编译的时候竟然是success的，但是在运行的时候还是报错，

后来发现是在dependencyManagement里面定义了，但是在外面没有引用：

这是我的：

   <dependency>
            <groupId>com.meituan.mafka</groupId>
            <artifactId>mafka-client_2.</artifactId>
        </dependency>

就是这个，东西，因为在inf-bom中定义了所以不用指定版本号，但是并没有显示的引用这个包，所以运行时报错了

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.</modelVersion>    <groupId>com.sankuai.qcs</groupId>
    <artifactId>qcs.regulation.light</artifactId>
    <version>0.0.-SNAPSHOT</version>
    <packaging>jar</packaging>    <name>light</name>
    <description>project for Spring Boot</description>    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0..RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>    <properties>
        <project.build.sourceEncoding>UTF-</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <inf-bom.version>1.3.9.1</inf-bom.version>
    </properties>    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.sankuai</groupId>
                <artifactId>inf-bom</artifactId>
                <version>${inf-bom.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>        </dependencies>
    </dependencyManagement>    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>        <!-- starter-log4j2 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j2</artifactId>
        </dependency>        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.3</version>
        </dependency>        <!-- Json -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.</version>
        </dependency>        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.</version>
        </dependency>        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.</version>
        </dependency>        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.</version>
        </dependency>        <dependency>
            <groupId>dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>1.6</version>
        </dependency>        <!-- mafka -->
        <dependency>
            <groupId>com.sankuai.octo</groupId>
            <artifactId>idl-common</artifactId>
        </dependency>        <dependency>
            <groupId>com.sankuai.octo</groupId>
            <artifactId>idl-sgagent</artifactId>
        </dependency>        <dependency>
            <groupId>com.sankuai.octo</groupId>
            <artifactId>mns-invoker</artifactId>
        </dependency>        <dependency>
            <groupId>com.sankuai.wm</groupId>
            <artifactId>retail.mq.client</artifactId>
            <version>1.1.-SNAPSHOT</version>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.zookeeper</groupId>
                    <artifactId>zookeeper</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.apache.zookeeper</groupId>
                    <artifactId>zookeeper</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.sankuai.wm</groupId>
                    <artifactId>retail.mq.mafka</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>log4j</groupId>
                    <artifactId>log4j</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.meituan.mafka</groupId>
                    <artifactId>mafka-client_2.</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>        <dependency>
            <groupId>com.meituan.mafka</groupId>
            <artifactId>mafka-client_2.</artifactId>
        </dependency>
        <dependency>
            <groupId>com.meituan.mtrace</groupId>
            <artifactId>mtrace</artifactId>
        </dependency>
        <dependency>
            <groupId>com.meituan.mtrace</groupId>
            <artifactId>mtrace-http</artifactId>
        </dependency>        <dependency>
            <groupId>com.sankuai.wm</groupId>
            <artifactId>retail.mq.mafka</artifactId>
            <version>1.1.-SNAPSHOT</version>
            <exclusions>
                <exclusion>
                    <groupId>com.meituan.mafka</groupId>
                    <artifactId>mafka-client_2.</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>        <!-- log4j -->        <dependency>
            <groupId>com.meituan.inf</groupId>
            <artifactId>xmd-log4j2</artifactId>
        </dependency>
        <!--如果线上服务已接入scribe-log4j2，请升级到本版本。注意groupId已变更-->
        <dependency>
            <groupId>com.meituan.log</groupId>
            <artifactId>scribe-log4j2</artifactId>
            <version>1.3.</version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>        <!--<dependency>-->
        <!--<groupId>org.slf4j</groupId>-->
        <!--<artifactId>slf4j-log4j12</artifactId>-->
        <!--<version>1.7.</version>-->
        <!--</dependency>-->    </dependencies>    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build></project>

其中：

 <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0..RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

指的是下面的spring 都不用指定版本号了，就按照2.0.3 就可以了；

参考：Spring Boot —— spring-boot-starter-parent

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