由於存儲庫中有重複的jar，我得到一個重複的類錯誤。 罐子來了一個開源的Apache項目的子模塊的POM，項目是James，子模塊是container-spring。Maven重複存儲庫中的jar
這裏是詹姆斯的根pom.xml中：
http://svn.apache.org/repos/asf/james/server/tags/james-server-3.0-beta4/pom.xml
這裏是子模塊容器彈簧的pom.xml：
http://svn.apache.org/repos/asf/james/server/tags/james-server-3.0-beta4/container-spring/pom.xml
要回答你的問題我配置了以下pom.xml的一個簡單的Maven項目：
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>com.stackoverflow.tuxi</groupId>
<artifactId>duplicatedjar</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.apache.james</groupId>
<artifactId>james-server</artifactId>
<version>3.0-beta4</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.apache.james</groupId>
<artifactId>james-server-container-spring</artifactId>
<version>3.0-beta4</version>
</dependency>
</dependencies>
</project>
然後執行Maven的依賴關係樹命令來分析依賴關係：
% mvn dependency:tree
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building duplicatedjar 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-dependency-plugin:2.1:tree (default-cli) @ duplicatedjar ---
[INFO] com.stackoverflow.tuxi:duplicatedjar:jar:1.0-SNAPSHOT
[INFO] +- org.apache.james:james-server:pom:3.0-beta4:compile
[INFO] \- org.apache.james:james-server-container-spring:jar:3.0-beta4:compile
[INFO] +- org.apache.james:james-server-lifecycle-spring:jar:3.0-beta4:compile
[INFO] | +- org.apache.geronimo.specs:geronimo-annotation_1.1_spec:jar:1.0.1:compile
[INFO] | \- org.apache.geronimo.specs:geronimo-jpa_2.0_spec:jar:1.0:compile
[INFO] +- org.apache.james:james-server-lifecycle-api:jar:3.0-beta4:compile
[INFO] +- org.apache.james:james-server-filesystem-api:jar:3.0-beta4:compile
[INFO] | +- org.apache.james:apache-jsieve-manager-api:jar:0.5:compile
[INFO] | \- commons-io:commons-io:jar:2.0.1:compile
[INFO] +- org.apache.james:james-server-mailetcontainer-api:jar:3.0-beta4:compile
[INFO] +- org.apache.james:james-server-protocols-library:jar:3.0-beta4:compile
[INFO] | +- org.apache.james:james-server-util:jar:3.0-beta4:compile
[INFO] | +- org.apache.james.protocols:protocols-netty:jar:1.6.2:compile
[INFO] | \- io.netty:netty:jar:3.3.1.Final:compile
[INFO] +- org.apache.james:james-server-data-api:jar:3.0-beta4:compile
[INFO] +- org.apache.james:james-server-core:jar:3.0-beta4:compile
[INFO] | \- org.apache.james:apache-mailet-base:jar:1.1:compile
[INFO] +- org.apache.james:apache-james-mailbox-api:jar:0.4:compile
[INFO] +- org.apache.james:apache-james-mailbox-tool:jar:0.4:compile
[INFO] | +- org.apache.james:apache-james-mailbox-store:jar:0.4:compile
[INFO] | | +- org.apache.james:apache-mime4j-core:jar:0.7.2:compile
[INFO] | | \- org.apache.james:apache-mime4j-dom:jar:0.7.2:compile
[INFO] | +- org.apache.james:apache-james-mailbox-memory:jar:0.4:compile
[INFO] | +- org.apache.geronimo.specs:geronimo-annotation_1.0_spec:jar:1.1.1:compile
[INFO] | \- org.apache.openjpa:openjpa:jar:2.1.0:compile
[INFO] | +- net.sourceforge.serp:serp:jar:1.13.1:compile
[INFO] | | \- junit:junit:jar:3.8.1:compile
[INFO] | +- org.apache.geronimo.specs:geronimo-jms_1.1_spec:jar:1.1.1:compile
[INFO] | +- org.apache.geronimo.specs:geronimo-jta_1.1_spec:jar:1.1.1:compile
[INFO] | \- commons-pool:commons-pool:jar:1.5.4:compile
[INFO] +- org.apache.james.protocols:protocols-api:jar:1.6.2:compile
[INFO] +- org.apache.james:apache-mailet:jar:2.4:compile
[INFO] +- org.springframework:spring-core:jar:3.1.0.RELEASE:compile
[INFO] | +- org.springframework:spring-asm:jar:3.1.0.RELEASE:compile
[INFO] | \- commons-logging:commons-logging:jar:1.1.1:compile
[INFO] +- org.springframework:spring-beans:jar:3.1.0.RELEASE:compile
[INFO] +- org.springframework:spring-context:jar:3.1.0.RELEASE:compile
[INFO] | +- org.springframework:spring-aop:jar:3.1.0.RELEASE:compile
[INFO] | \- org.springframework:spring-expression:jar:3.1.0.RELEASE:compile
[INFO] +- org.springframework:spring-web:jar:3.1.0.RELEASE:compile
[INFO] | \- aopalliance:aopalliance:jar:1.0:compile
[INFO] +- org.springframework.osgi:spring-osgi-extender:jar:1.2.1:compile
[INFO] | +- org.springframework.osgi:spring-osgi-core:jar:1.2.1:compile
[INFO] | | +- org.springframework:org.springframework.aop:jar:2.5.6.SEC01:compile
[INFO] | | | \- org.aopalliance:com.springsource.org.aopalliance:jar:1.0.0:compile
[INFO] | | +- org.springframework:org.springframework.beans:jar:2.5.6.SEC01:compile
[INFO] | | +- org.springframework:org.springframework.context:jar:2.5.6.SEC01:compile
[INFO] | | \- org.springframework:org.springframework.core:jar:2.5.6.SEC01:compile
[INFO] | \- org.springframework.osgi:spring-osgi-io:jar:1.2.1:compile
[INFO] +- org.osgi:org.osgi.core:jar:4.2.0:compile
[INFO] +- commons-configuration:commons-configuration:jar:1.6:compile
[INFO] | +- commons-collections:commons-collections:jar:3.2.1:compile
[INFO] | \- commons-lang:commons-lang:jar:2.4:compile
[INFO] +- org.slf4j:slf4j-api:jar:1.6.1:compile
[INFO] +- javax.mail:mail:jar:1.4.4:compile
[INFO] \- log4j:log4j:jar:1.2.16:compile
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.140s
[INFO] Finished at: Sun Sep 30 12:30:30 BRT 2012
[INFO] Final Memory: 12M/169M
[INFO] ------------------------------------------------------------------------
我不知道你的項目中的哪些罐子與上面的罐子衝突，但我注意到彈簧的依賴取決於apache公共套件（c ommons-xxx deps）。很多項目中使用它們（IMO了很多自己的東西應該在JDK本身被合併，但那是另一個線程），但一些公共圖書館有一些問題：
其實這是很正常的現象有依賴性衝突與Apache普通套房，所以我在這裏猜測這是你的行爲尿問題。
通常這種情況的解決方案是宣佈你在你的項目中直接依賴需要Apache公共庫和排除衝突庫也依賴關係部分，像@Vikdor說
你最終的東西大概就是這個樣子（這是刪除重要的只有衝突的那些，不是所有的人都喜歡在下面的例子中，或者你的軟件將無法正常工作）：
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>com.stackoverflow.tuxi</groupId>
<artifactId>duplicatedjar</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.apache.james</groupId>
<artifactId>james-server</artifactId>
<version>3.0-beta4</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.apache.james</groupId>
<artifactId>james-server-container-spring</artifactId>
<version>3.0-beta4</version>
<!-- DO NOT exclude all of them, only the conflicting ones -->
<exclusions>
<exclusion>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
</exclusion>
<exclusion>
<groupId>commons-pool</groupId>
<artifactId>commons-pool</artifactId>
</exclusion>
<exclusion>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
</exclusion>
<exclusion>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
</exclusion>
<exclusion>
<groupId>commons-lang</groupId>
<artifactId>commons-lang</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
</project>
當我添加彈簧依賴項時出現了這個問題。然後我刪除了春天的依賴，但錯誤沒有改變。畢竟我在eclipse中生成了一個新的工作區，並將現有的項目導入到它中，並且錯誤消失了，這讓我覺得也不是eclipse，也不是maven，也不是spring依賴關係是合理的。謝謝你的回答。 – merveotesi
應指定相應的罐子一個子項目，你想排除在主jar的依賴聲明中。
有關如何定義依賴項排除的更多詳細信息，請參閱maven documentation。
請正確格式化POM讓其他有能夠閱讀你發佈的內容。 – khmarbaise
您可能想分享並向我們展示如何使用這些依賴關係，以便我們可以分辨出問題所在。 –