java – Transitive Maven依赖项依赖于：tree但不在lib目录中显示
作者：互联网
我正在使用Maven 3.0.3构建一个大型java项目.我的pom.xml有一个父,它依赖于spring-context(编译范围),而spring依赖于spring-expression(也在编译范围内).当我使用mvn：dependencyTree创建一个dependency tree时,一切看起来都很好,spring-expression库在编译范围内变为传递依赖.但是,如果我使用mvn help构建一个effective pom：effective-pom缺少spring-expression的条目.另外,如果我构建项目,则spring-expression的lib不包含在lib目录中,而spring-context的lib则不包含在lib目录中.
直到最近,该库已包含在构建中,现在其中一个依赖项似乎发生了变化.但是Spring-context仍然在编译范围内并显示在依赖关系树中,因此我不明白为什么这应该改变了行为.
此外,更新Maven(似乎已经解决了可能相关的问题here)遗憾的是不是一种选择.我暂时通过将spring-expression添加为我的项目的直接而不是传递依赖来解决问题,但我宁愿不用已经存在的东西阻塞pom.有任何想法吗？
更新：Weirder和weirder ……在尝试提出一个最小的例子时,我找到了一种.这就是我想出的：
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.test.project</groupId>
<artifactId>test-project</artifactId>
<packaging>war</packaging>
<version>0.1-SNAPSHOT</version>
<name>Test Project</name>
<properties>
<spring.version>3.2.4.RELEASE</spring.version>
</properties>
<dependencies>
<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
<scope>runtime</scope>
</dependency>
</dependencies>
</project>
它的工作原理是传递依赖spring-expression在mvn：dependencyTree的输出中显示：
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Test Project 0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-dependency-plugin:2.1:tree (default-cli) @ test-project ---
[INFO] org.test.project:test-project:war:0.1-SNAPSHOT
[INFO] \- org.springframework:spring-context:jar:3.2.4.RELEASE:runtime
[INFO] +- org.springframework:spring-aop:jar:3.2.4.RELEASE:runtime
[INFO] | \- aopalliance:aopalliance:jar:1.0:runtime
[INFO] +- org.springframework:spring-beans:jar:3.2.4.RELEASE:runtime
[INFO] +- org.springframework:spring-core:jar:3.2.4.RELEASE:runtime
[INFO] | \- commons-logging:commons-logging:jar:1.1.1:runtime
[INFO] \- org.springframework:spring-expression:jar:3.2.4.RELEASE:runtime
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.922s
[INFO] Finished at: Thu Apr 10 16:17:42 CEST 2014
[INFO] Final Memory: 5M/15M
[INFO] ------------------------------------------------------------------------
而不是有效的pom：
<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>org.test.project</groupId>
<artifactId>test-project</artifactId>
<version>0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>Test Project</name>
<distributionManagement>
<repository>
<id>internal_repo</id>
<name>Repository for internal artefacts</name>
<url>http://internal/url</url>
</repository>
<snapshotRepository>
<id>internal_repo</id>
<name>Repository for internal artefacts</name>
<url>http://internal/url</url>
</snapshotRepository>
</distributionManagement>
<properties>
<downloadJavadocs>true</downloadJavadocs>
<downloadSources>true</downloadSources>
<spring.version>3.2.4.RELEASE</spring.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>3.2.4.RELEASE</version>
<scope>runtime</scope>
</dependency>
</dependencies>
<repositories>
<repository>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
<id>central</id>
<url>http://internal/url</url>
</repository>
<repository>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
<id>maven3</id>
<url>http://internal/url</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
<id>central</id>
<url>http://internal/url</url>
</pluginRepository>
<pluginRepository>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
<id>maven3</id>
<url>http://internal/url</url>
</pluginRepository>
</pluginRepositories>
<build>
<sourceDirectory>c:\projects\test-project\src\main\java</sourceDirectory>
<scriptSourceDirectory>c:\projects\test-project\src\main\scripts</scriptSourceDirectory>
<testSourceDirectory>c:\projects\test-project\src\test\java</testSourceDirectory>
<outputDirectory>c:\projects\test-project\target\classes</outputDirectory>
<testOutputDirectory>c:\projects\test-project\target\test-classes</testOutputDirectory>
<resources>
<resource>
<directory>c:\projects\test-project\src\main\resources</directory>
</resource>
</resources>
<testResources>
<testResource>
<directory>c:\projects\test-project\src\test\resources</directory>
</testResource>
</testResources>
<directory>c:\projects\test-project\target</directory>
<finalName>test-project-0.1-SNAPSHOT</finalName>
<pluginManagement>
<plugins>
<plugin>
<artifactId>maven-antrun-plugin</artifactId>
<version>1.3</version>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.2-beta-5</version>
</plugin>
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.1</version>
</plugin>
<plugin>
<artifactId>maven-release-plugin</artifactId>
<version>2.0</version>
</plugin>
</plugins>
</pluginManagement>
<plugins>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>2.4.1</version>
<executions>
<execution>
<id>default-clean</id>
<phase>clean</phase>
<goals>
<goal>clean</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.3.1</version>
<executions>
<execution>
<id>default-install</id>
<phase>install</phase>
<goals>
<goal>install</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>2.4.3</version>
<executions>
<execution>
<id>default-resources</id>
<phase>process-resources</phase>
<goals>
<goal>resources</goal>
</goals>
</execution>
<execution>
<id>default-testResources</id>
<phase>process-test-resources</phase>
<goals>
<goal>testResources</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.7.2</version>
<executions>
<execution>
<id>default-test</id>
<phase>test</phase>
<goals>
<goal>test</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<executions>
<execution>
<id>default-testCompile</id>
<phase>test-compile</phase>
<goals>
<goal>testCompile</goal>
</goals>
</execution>
<execution>
<id>default-compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>2.1.1</version>
<executions>
<execution>
<id>default-war</id>
<phase>package</phase>
<goals>
<goal>war</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.5</version>
<executions>
<execution>
<id>default-deploy</id>
<phase>deploy</phase>
<goals>
<goal>deploy</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-site-plugin</artifactId>
<version>2.0.1</version>
<executions>
<execution>
<id>default-site</id>
<phase>site</phase>
<goals>
<goal>site</goal>
</goals>
<configuration>
<outputDirectory>c:\projects\test-project\target\site</outputDirectory>
<reportPlugins>
<reportPlugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-project-info-reports-plugin</artifactId>
</reportPlugin>
</reportPlugins>
</configuration>
</execution>
<execution>
<id>default-deploy</id>
<phase>site-deploy</phase>
<goals>
<goal>deploy</goal>
</goals>
<configuration>
<outputDirectory>c:\projects\test-project\target\site</outputDirectory>
<reportPlugins>
<reportPlugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-project-info-reports-plugin</artifactId>
</reportPlugin>
</reportPlugins>
</configuration>
</execution>
</executions>
<configuration>
<outputDirectory>c:\projects\test-project\target\site</outputDirectory>
<reportPlugins>
<reportPlugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-project-info-reports-plugin</artifactId>
</reportPlugin>
</reportPlugins>
</configuration>
</plugin>
</plugins>
</build>
<reporting>
<outputDirectory>c:\projects\test-project\target\site</outputDirectory>
</reporting>
</project>
但是,当我构建项目时,lib目录在此示例中包含spring-expression.怎么会这样？
解决方法:
我正在使用maven 3.1.1运行,并且依赖spring-expression正确地添加到WEB-INF / lib.有效的pom不包含spring-expression,但这是正常的,因为有效的pom不能解决传递依赖性.
有效的pom只是一个合并的xml文件,当前的pom加上所有它的父母合并在一起.只有在构建有效的pom之后才应用maven依赖性解析机制.
这就是为什么有效pom只包含spring-context依赖的原因,因为这是pom.xml中唯一指定的东西.如果父pom中存在父依赖关系,它们也会出现在有效pom中.
这是我对mvn依赖的输出：tree：
INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ test-project ---
[INFO] org.test.project:test-project:war:0.1-SNAPSHOT
[INFO] \- org.springframework:spring-context:jar:3.2.4.RELEASE:runtime
[INFO] +- org.springframework:spring-aop:jar:3.2.4.RELEASE:runtime
[INFO] | \- aopalliance:aopalliance:jar:1.0:runtime
[INFO] +- org.springframework:spring-beans:jar:3.2.4.RELEASE:runtime
[INFO] +- org.springframework:spring-core:jar:3.2.4.RELEASE:runtime
[INFO] | \- commons-logging:commons-logging:jar:1.1.1:runtime
[INFO] \- org.springframework:spring-expression:jar:3.2.4.RELEASE:runtime
这些是我的WEB-INF / lib内容：
aopalliance-1.0.jar
commons-logging-1.1.1.jar
spring-aop-3.2.4.RELEASE.jar
spring-beans-3.2.4.RELEASE.jar
spring-context-3.2.4.RELEASE.jar
spring-core-3.2.4.RELEASE.jar
spring-expression-3.2.4.RELEASE.jar
所以问题似乎是对有效pom功能的一些误解,以及由于maven错误而在WEB-INF lib中缺少依赖spring-expression：这个问题可以通过版本升级或对pom的硬编码依赖来解决,因为你找到了解决方法出.
标签：java,maven,dependencies,pom-xml,maven-3 来源： https://codeday.me/bug/20190728/1562911.html