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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_2.10</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>4.0.0</modelVersion> <groupId>com.sankuai.qcs</groupId> <artifactId>qcs.regulation.light</artifactId> <version>0.0.1-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>2.0.3.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</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>1.2.29</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.9.3</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.9.3</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> <version>2.9.3</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>1.1.3-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_2.10</artifactId> </exclusion> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>com.meituan.mafka</groupId> <artifactId>mafka-client_2.10</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>1.1.5-SNAPSHOT</version> <exclusions> <exclusion> <groupId>com.meituan.mafka</groupId> <artifactId>mafka-client_2.10</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>1.3.1</version> <exclusions> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> </exclusion> </exclusions> </dependency> <!--<dependency>--> <!--<groupId>org.slf4j</groupId>--> <!--<artifactId>slf4j-log4j12</artifactId>--> <!--<version>1.7.25</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>2.0.3.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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