问题描述

我使用 m2eclipse 作为我的 maven 2 Eclipse 插件.我是 maven 的新手，所以我的错误可能很简单，尽管搜索并没有为我提供任何解决方案.我可以从命令行运行 maven 并成功构建.但是，如果我作为现有的 maven 项目导入，或者使用 mvn eclipse:eclipse 然后导入，我会得到在我的 POM 文件中找不到的工件，导致根本没有加载任何 maven 依赖项.

I'm using m2eclipse as my maven 2 plugin for eclipse. I'm brand new to maven, so my mistake might be simple, although searching has not yielded any solutions for me. I can run maven from the command line and it build successfully. However if I import as an existing maven project, or use mvn eclipse:eclipse and then import I get the artifacts not found in my POM file resulting in no maven dependencies being loaded at all.

奇怪的是我有 2 个项目，都是父 pom 打包项目的子项目.一个孩子加载了我所有的 maven 依赖项，而另一个找不到任何依赖项，并说我的 pom 文件缺少工件.同样，我可以从命令行安装和打包它们.

What's odd is that I have 2 projects, both children to a parent pom packaged project. One child loads all my maven dependencies while the other cannot find any and says my pom file is missing artifacts. Again, I can install and package them all just fine from the command line.

我什至尝试将我的项目加载到运行完美的 netbeans 中，但是我需要使用 eclipse.

I even tried loading my projects into netbeans which worked flawlessly, however I am required to use eclipse.

关于如何解决这个问题的任何想法?

Any ideas on how to fix this?

目录结构，pom文件布局:

Directory structure, pom files layout:

--main
  --pom.xml   (is a pom package that is the parent to two other projects)
  --ProjectA
    --pom.xml
  --ProjectB
    --pom.xml

Main 是 ProjectA 和 ProjectB 的父项目.ProjectB 将 ProjectA 作为依赖项.显然 m2eclipse 对这种依赖并不满意.一旦我从 ProjectB 的 pom 文件中删除 ProjectA 的依赖项，eclipse 就会找到所有 maven 依赖项.

Main is the parent project of both ProjectA and ProjectB. ProjectB has ProjectA as a dependency. Apprently m2eclipse is not happy about that depedency. As soon as I remove the dependency of ProjectA from ProjectB's pom file all the maven dependencies are found by eclipse.

- com.company.myproj:app:6.6.0:jar Missing: ---------- 1) com.company.myproj:main:pom:${myproj.version} ---------- 1 required artifact is missing. for artifact: com.company.myproj:main:pom:$
 {myproj.version} from the specified remote repositories: apache-incubating (http://people.apache.org/repo/m2-incubating-repository/, releases=true, snapshots=true), central (http://
 repo1.maven.org/maven2, releases=true, snapshots=false)

但是，我仍然需要 ProjectB 才能拥有 ProjectA 的依赖项.错误消息似乎是 m2eclipse 在远程仓库中寻找 ProjectA.项目 A 应该只在 .m2 目录中，但我不知道如何告诉 m2eclipse 去那里看.

However, I still need ProjectB to have that dependency for ProjectA. The error message seems to be m2eclipse looking for ProjectA in a remote repo. Project A should only be in .m2 directory, but I'm not sure how to tell m2eclipse to look there.

我认为这可能只是一个 m2eclipse 特定的问题，因为从命令行使用 mvn 可以正常工作，就像我之前所说的，netbeans 可以正常加载项目和依赖项.

I think this may be just a m2eclipse specific issue because using mvn from the command line works fine and like I said previously, netbeans loads the projects and dependencies just fine.

推荐答案

我在其他项目中创建的依赖项中遇到了这个问题.下载的第三方依赖项在构建路径中显示正常，但不是我创建的库.

I had this issue for dependencies that were created in other projects. Downloaded thirdparty dependencies showed up fine in the build path, but not a library that I had created.

解决方案:在未正确构建的项目中，右键单击该项目并选择属性，然后选择 Maven.取消选中标有解决工作区项目中的依赖项"的框，点击应用，然后点击确定.再次右键单击您的项目并执行 Maven->Update Snapshots(或 Update Dependencies)，当您的项目重新构建时，您的错误应该会消失(如果您启用了自动构建，则会自动消失).

SOLUTION: In the project that is not building correctly, right-click on the project and choose Properties, and then Maven. Uncheck the box labeled "Resolve dependencies from Workspace projects", hit Apply, and then OK. Right-click again on your project and do a Maven->Update Snapshots (or Update Dependencies) and your errors should go away when your project rebuilds (automatically if you have auto-build enabled).

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