Maven重复类的解决

1. 设置仓库,我的Settings里设置使用了公司的Nexus

<?xml version="1.0"?>

<settings 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/settings-1.0.0.xsd">



    <localRepository>D:\mavenrepo</localRepository>



    <servers>

        <server>

            <id>snapshots</id>

            <username>snapshots</username>

            <password>xxx</password>

            <filePermissions>664</filePermissions>

            <directoryPermissions>775</directoryPermissions>

        </server>

    </servers>



    <distributionManagement>

        <repository>

            <id>releases</id>

            <name>xxx Nexus Releases</name>

            <url>xxxx</url>

        </repository>

        <snapshotRepository>

            <uniqueVersion>false</uniqueVersion>

            <id>snapshots</id>

            <name>xxx Nexus Snapshots</name>

            <url>xxxxx</url>

        </snapshotRepository>

    </distributionManagement>

    <profiles>

        <profile>

            <id>xxxNexus</id>

            <repositories>

                <repository>

                    <id>xxxNexus</id>

                    <url>xxx</url>

                    <releases>

                        <enabled>true</enabled>

                        <!-- always , daily (default), interval:X (where X is an integer in minutes) or never. -->

                        <updatePolicy>daily</updatePolicy>

                        <checksumPolicy>warn</checksumPolicy>

                    </releases>

                    <snapshots>

                        <enabled>true</enabled>

                        <checksumPolicy>fail</checksumPolicy>

                    </snapshots>

                </repository>

            </repositories>

            <pluginRepositories>

                <pluginRepository>

                    <id>xxxNexus</id>

                    <url>xxxx</url>

                    <releases>

                        <enabled>true</enabled>

                        <checksumPolicy>warn</checksumPolicy>

                    </releases>

                    <snapshots>

                        <enabled>true</enabled>

                        <checksumPolicy>fail</checksumPolicy>

                    </snapshots>

                </pluginRepository>

            </pluginRepositories>

        </profile>

    </profiles>



    <activeProfiles>

        <activeProfile>xxxNexus</activeProfile>

    </activeProfiles>



</settings>

 

 

2.发现重复类,执行命令

mvn -U clean package -Plocal -Dmaven.test.skip=true enforcer:enforce -DcheckDeployRelease_skip=true

 

-Dmaven.test.skip=true: 如果命令包含了test phase，则忽略单元测试

enforcer:enforce: 查找重复类

-DcheckDeployRelease_skip: 不知道什么意思

 

执行命令后,输出如下

可以发现 jcl-over-slf4j 与 commons-logging 包有重复类冲突

 

3. 在pom里查找重复类冲突的包并排除重复类冲突

由于在我的pom里并没有显式写入common-logging的dependency,所以我们需要查找那个jar包依赖了commons-logging,执行如下命令

mvn -U dependency:tree -Dverbose

发现如下片段

在这个叫qsso-client的库里依赖了commons-logging包,所以我们在pom里将其排除

 

3. 排除重复类

            <dependency>

                <groupId>com.xxx.security</groupId>

                <artifactId>qsso-client</artifactId>

                <version>${qsso-client.version}</version>

                <exclusions>

                    <exclusion>

                        <groupId>commons-logging</groupId>

                        <artifactId>commons-logging</artifactId>

                    </exclusion>

                </exclusions>

            </dependency>

这样就将qsso-client的commons-logging包排除了,之后再运行enforcer:enforce则不会再报错