blocks|key|1748648|text|您不能使Maven重新下载依赖项，但您可以做的是清除使用mvn+dependency:purge-local-repository错误下载的依赖项|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1748649|请参阅：http://maven.apache.org/plugins/maven-dependency-plugin/purge-local-repository-mojo.html|1748650|这将查找当前项目的所有传递依赖项的列表，删除它们，然后重新下载它们。如果你想在每次构建时都运行它，你甚至可以将它作为插件添加到你的pom中。|1748651|entityMap|0|LINK|mutability|MUTABLE|url|http://maven.apache.org/plugins/maven-dependency-plugin/purge-local-repository-mojo.html^0|S|11|0|4|2G|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@]|D|@$9|V|A|W|1|X]]|E|$]]|$1|H|3|I|5|6|7|Y|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|K|$L|$5|M|N|O|E|$P|Q]]]]

You cannot make Maven re-download dependencies, but what you can do instead is to purge dependencies that were incorrectly downloaded using <code>mvn dependency:purge-local-repository</code>
See: <a href="http://maven.apache.org/plugins/maven-dependency-plugin/purge-local-repository-mojo.html" rel="noreferrer">http://maven.apache.org/plugins/maven-dependency-plugin/purge-local-repository-mojo.html</a>
This looks up the list of all transitive dependencies of the current project, deletes them, then redownloads them. You can even add it as a plugin into your pom if you want to run it with every build.

blocks|key|1748779|text|我刚刚删除了我的~/.m2/仓库，这迫使我重新下载;)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1748780|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I just deleted my ~/.m2/repository and that forced a re-download ;)

blocks|key|1749191|text|基于阿里托克曼的答案。我设法用以下命令强制删除了一个特定的本地依赖项：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1749192|mvn+dependency:purge-local-repository+-DmanualInclude=com.skyfish:utils|code-block|syntax|javascript|1749193|这样，它就从我的.m2/仓库中删除了utils，并且当我继续运行mvn+clean+install时，它总是重新下载utils+JAR依赖项。如果您想要更具编程性的东西，也可以看看-Dinclude=...选项。|offset|length|style|CODE|1749194|entityMap^0|0|0|I|5|W|H|1M|5|2I|D|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]|$I|V|J|W|K|L]|$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|N|$]]

Based on Ali Tokmen answer. I managed to force delete a single specific local dependency with the following command:
<pre><code>mvn dependency:purge-local-repository -DmanualInclude=com.skyfish:utils
</code></pre>
With this, it removes <code>utils</code> from my .m2/repository and it always re-download the <code>utils</code> JAR dependency when I proceed to run <code>mvn clean install</code>. If you want something more programmatic possibly also see the <code>-Dinclude=...</code> option.

blocks|key|1749116|text|我认为下面的命令可能会对你有所帮助！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1749117|1749118|mvn+-U+clean+install|code-block|syntax|javascript|1749119|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|K|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|L|8|@]|9|@]|A|$F|G]]|$1|H|3|-4|5|6|7|M|8|@]|9|@]|A|$]]]|I|$]]

I think following command may help you!

<hr>

<pre><code>mvn -U clean install
</code></pre>

blocks|key|1749022|text|项目右键单击->+Maven+->更新项目并选中屏幕截图中的复选框。它还将更新版本:)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1749023|​|1749024|📷|atomic|offset|length|1749025|1749026|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/02d6f3eb707f6659615e835566c037cb.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

Project right click-> Maven -> Update Project
and check the checkboxes as in the screen shot. It will update releases as well :)

<img src="https://i.stack.imgur.com/peNZX.png" alt="enter image description here">

blocks|key|1749263|text|mvn+clean+install+-U|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1749264|-U表示强制更新依赖项。|unstyled|1749265|如果您想在不使用clean或-U的情况下更新单个依赖项，只需将其从本地存储库中删除，然后进行构建即可。|1749266|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>mvn clean install -U
</code></pre>

-U means force update of dependencies.

If you want to update a single dependency without clean or -U you could just remove it from your local repo and then build.

blocks|key|1963150|text|如果您知道X的组id，则可以使用此命令重新下载所有X及其依赖项|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1963151|mvn+clean+dependency:purge-local-repository+-DresolutionFuzziness=org.id.of.x|code-block|syntax|javascript|1963152|它与其他建议使用dependency:purge-local-repository的答案做同样的事情，但它只删除和重新下载与X相关的所有内容。|1963153|entityMap^0|5|1|P|1|0|0|8|X|1Q|1|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|N|$]]

If you know the group id of <code>X</code>, you can use this command to redownload all of <code>X</code> and it's dependencies

<pre><code>mvn clean dependency:purge-local-repository -DresolutionFuzziness=org.id.of.x
</code></pre>

It does the same thing as the other answers that propose using <code>dependency:purge-local-repository</code>, but it only deletes and redownloads everything related to <code>X</code>.

blocks|key|1961917|text|当您将其添加到X时，您应该已经递增了X的版本号，即X-1.2|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1961918|然后，X-1.2应该已经安装/部署，并且您应该已经将项目对X的依赖更改为依赖于新版本X-1.2|1961919|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

When you added it to X, you should have incremented X's version number i.e X-1.2 
Then X-1.2 should have been installed/deployed and you should have changed your projects dependency on X to be dependent on the new version X-1.2

blocks|key|1962254|text|如果您真的想强制下载所有依赖项，可以尝试重新初始化整个maven存储库。就像已经描述过的this+article一样，你可以使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1962255|mvn+-Dmaven.repo.local=$HOME/.my/other/repository+clean+install|code-block|syntax|javascript|1962256|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/6823462/specifying-mavens-local-repository-location-as-a-cli-parameter^0|18|C|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

If you really want to force-download all dependencies, you can try to re-initialise the entire maven repository. Like in <a href="https://stackoverflow.com/questions/6823462/specifying-mavens-local-repository-location-as-a-cli-parameter">this article</a> already described, you could use:

<pre><code>mvn -Dmaven.repo.local=$HOME/.my/other/repository clean install
</code></pre>

blocks|key|1963048|text|转到生成路径...删除已添加的现有maven库...单击添加库...单击maven+managed+dependencies...然后单击maven+project+settings...选中解决maven依赖关系复选框..它将下载所有maven依赖关系|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1963049|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Go to build path... delete existing maven library u added... click add library ... click maven managed dependencies... then click maven project settings... check resolve maven dependencies check box..it'll download all maven dependencies

blocks|key|1749739|text|上面提供的大多数答案都可以解决这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1749740|但是，如果您使用IntelliJ，并希望它自动为您修复它，请转到Maven设置。|1749741|生成、执行、部署->生成工具->+maven.|1749742|​|1749743|📷|atomic|offset|length|1749744|1749745|禁用脱机工作|1749746|启用总是更新快照(需要时切换)|1749747|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/939295fa65822c57c1c5b6c7c973bc38.jpeg|imageAlt^0|0|0|0|0|0|1|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|14|8|@]|9|@$K|15|L|16|1|17]]|A|$]]|$1|M|3|G|5|6|7|18|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|19|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1A|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y|Z|-4]]]]

Most answers provided above would solve the problem.

But if you use IntelliJ and want it to just fix it for you automatically, go to Maven Settings.

Build,Execution, Deployment -> Build Tools -> Maven

<a href="https://i.stack.imgur.com/U3QUX.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/U3QUX.jpg" alt="enter image description here"></a>

Disable Work Offline

Enable Always update snapshots (Switch when required)

I'm working on a project with dependency X. X, in turn, depends on Y.

I used to explicitly include Y in my project's pom. However, it was not used and to make things cleaner, I instead added it to X's pom as a dependency. X is marked as a release dependency.

The problem is that after removing Y from my project's pom and adding it to X's pom, my project isn't picking it up on <code>mvn -U clean package</code>. I know -U update snapshots but not releases.

So, without deleting the ~/.m2/repository directory how can I force a re-download of X's pom? Also, I tried running <code>dependency:purge-local-repository</code> and it didn't work either.

Force re-download of release dependency using Maven

我正在做一个依赖于X.X的项目，而X依赖于Y。我过去常常在项目的pom中显式地包含Y。然而，它并没有被使用，为了让事情更清晰，我把它作为依赖项添加到了X的pom中。X被标记为发布依赖项。问题是，在从我的项目的pom中删除Y并将其添加到X的pom之后，我的项目并没有在mvn -U clean package上获得它。我知道-U更新快照，但不知道版本。那么，在不删除~/.m2/repository目录

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