Maven 依赖插件似乎无法解决所有依赖项答案

【问题标题】：Maven dependency plugin seems not resolve all dependenciesMaven 依赖插件似乎无法解决所有依赖项
【发布时间】：2014-12-09 23:47:57
【问题描述】：

我创建了一个非常简单的 Maven 项目，它构建了一个 .war 文件。 Maven 版本 3.2.3，Java 版本 1.7.0_67。 pom.xml 文件在这个gist 中。

如果我运行mvn clean install，则项目构建良好。但是如果我先用mvn dependency:resolve 和mvn dependency:resolve-plugins 下载所有依赖项，然后运行mvn -o install 离线构建，我会收到如下错误。

[INFO] --- maven-resources-plugin:2.7:resources (default-resources) @ docker-restaesy-1 ---
[WARNING] The POM for org.apache.maven:maven-plugin-api:jar:2.2.1 is missing, no dependency information available
[WARNING] The POM for org.apache.maven:maven-project:jar:2.2.1 is missing, no dependency information available
[WARNING] The POM for org.apache.maven:maven-core:jar:2.2.1 is missing, no dependency information available
[WARNING] The POM for org.apache.maven:maven-artifact:jar:2.2.1 is missing, no dependency information available
[WARNING] The POM for org.apache.maven:maven-settings:jar:2.2.1 is missing, no dependency information available
[WARNING] The POM for org.apache.maven:maven-model:jar:2.2.1 is missing, no dependency information available
[WARNING] The POM for org.apache.maven:maven-monitor:jar:2.2.1 is missing, no dependency information available
[WARNING] The POM for org.codehaus.plexus:plexus-utils:jar:3.0.15 is missing, no dependency information available
[WARNING] The POM for org.apache.maven.shared:maven-filtering:jar:1.2 is missing, no dependency information available
[WARNING] The POM for org.codehaus.plexus:plexus-interpolation:jar:1.19 is missing, no dependency information available
[WARNING] Error injecting: org.apache.maven.shared.filtering.DefaultMavenResourcesFiltering
java.lang.NoClassDefFoundError: Lorg/sonatype/plexus/build/incremental/BuildContext;
    at java.lang.Class.getDeclaredFields0(Native Method)
    at java.lang.Class.privateGetDeclaredFields(Class.java:2436)
    at java.lang.Class.getDeclaredFields(Class.java:1806)
    at com.google.inject.spi.InjectionPoint.getInjectionPoints(InjectionPoint.java:661)
    at com.google.inject.spi.InjectionPoint.forInstanceMethodsAndFields(InjectionPoint.java:366)
    at com.google.inject.internal.ConstructorBindingImpl.getInternalDependencies(ConstructorBindingImpl.java:165)
    at com.google.inject.internal.InjectorImpl.getInternalDependencies(InjectorImpl.java:609)
    at com.google.inject.internal.InjectorImpl.cleanup(InjectorImpl.java:565)
...
Caused by: java.lang.ClassNotFoundException: org.sonatype.plexus.build.incremental.BuildContext
    at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50)
    at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:259)
    at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:235)
    at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:227)
...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.544 s
[INFO] Finished at: 2014-12-09T23:24:57+00:00
[INFO] Final Memory: 9M/303M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-resources-plugin:2.7:resources (default-resources) on project docker-restaesy-1: Execution default-resources of goal org.apache.maven.plugins:maven-resources-plugin:2.7:resources failed: A required class was missing while executing org.apache.maven.plugins:maven-resources-plugin:2.7:resources: Lorg/sonatype/plexus/build/incremental/BuildContext;
[ERROR] -----------------------------------------------------
[ERROR] realm =    plugin>org.apache.maven.plugins:maven-resources-plugin:2.7
[ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
[ERROR] urls[0] = file:/root/.m2/repository/org/apache/maven/plugins/maven-resources-plugin/2.7/maven-resources-plugin-2.7.jar
[ERROR] urls[1] = file:/root/.m2/repository/org/codehaus/plexus/plexus-utils/3.0.15/plexus-utils-3.0.15.jar
[ERROR] urls[2] = file:/root/.m2/repository/org/apache/maven/shared/maven-filtering/1.2/maven-filtering-1.2.jar
[ERROR] urls[3] = file:/root/.m2/repository/org/codehaus/plexus/plexus-interpolation/1.19/plexus-interpolation-1.19.jar
[ERROR] Number of foreign imports: 1
[ERROR] import: Entry[import  from realm ClassRealm[maven.api, parent: null]]

我比较了两种方式创建的 .m2/repository 文件夹，使用依赖插件创建的一种缺少很多文件，其中大部分与 plexus 相关。

那么为什么依赖插件不解析所有的依赖呢？我在这里做错了吗？谢谢

编辑我得到与mvn dependency:go-offline 相同的错误

【问题讨论】：

我怀疑有些插件在运行时使用依赖插件来解析依赖
您还有其他问题导致消息The POM for org.apache.maven:maven-plugin-api:jar:2.2.1 is missing, no dependency information available 显示您尚未下载所有适当的文件。这是根本原因。

标签： java maven maven-3 maven-dependency-plugin

【解决方案1】：

我知道这为时已晚，但如果对某人有帮助，请发布此答案。 java.lang.ClassNotFoundException: 显然意味着 org.sonatype.plexus.build.incremental.BuildContext 的 jar 是

不可用
可用但路径错误
jar 已损坏

负责这个类的jar是plexus-build-api-0.0.4.jar

检查您的构建输出并查看 mvn 正在查找此 jar 的路径。例如，我的输出中有以下行 /Users/akash/.m2/repository/org/sonatype/plexus/plexus-build-api/0.0.4/

在我的情况下，jar plexus-build-api-0.0.4.jar 在此路径中已损坏。我检查了 $jar -tbv ，它不返回类名，然后它损坏了我从link 下载了它并以我的方式工作。在您的情况下，您没有此路径，因此您必须重新创建项目/重新安装插件。

您也可以尝试手动创建此路径，从linklink下载jar，看看是否有效。

【讨论】：