如何强制maven更新？

Question

我在另一台计算机上导入了已经在工作的项目，它开始下载依赖项。

显然，我的互联网连接崩溃了，现在我得到了以下信息：

    >Build errors for comics; org.apache.maven.lifecycle.LifecycleExecutionException:
    Failed to execute goal on project comicsTest: Could not resolve dependencies for project comicsTest:comicsTest:war:0.0.1-SNAPSHOT:
    The following artifacts could not be resolved:
    org.springframework:spring-context:jar:3.0.5.RELEASE,
    org.hibernate:hibernate-entitymanager:jar:3.6.0.Final,
    org.hibernate:hibernate-core:jar:3.6.0.Final,
    org.hibernate:hibernate-commons-annotations:jar:3.2.0.Final,
    org.aspectj:aspectjweaver:jar:1.6.8,
    commons-lang:commons-lang:jar:2.5,

    >mysql:mysql-connector-java:jar:5.1.13: Failure to transfer org.springframework:spring-context:jar:3.0.5.RELEASE from http://repo1.maven.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced.

    >Original error: Could not transfer artifact org.springframework:spring-context:jar:3.0.5.RELEASE from central (http://repo1.maven.org/maven2): No response received after 60000

如何强制maven更新？

Answer 1

mvn clean install -U

-U表示强制更新快照依赖关系。

如果以前从未成功下载过版本依赖项，则会以这种方式更新它们。参考：https://stackoverflow.com/a/29020990/32453

Answer 2

如果您的本地存储库因某种原因被用于发布jars而不是快照(-U和--update-snapshots仅更新快照)，您可以使用以下方法清除本地存储库：

 mvn dependency:purge-local-repository

然后，您可能想要清理并重新安装：

 mvn dependency:purge-local-repository clean install

有关更多信息，请访问https://maven.apache.org/plugins/maven-dependency-plugin/examples/purging-local-repository.html

Answer 3

-U似乎强制更新所有快照依赖项。

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。

下面的示例用于更新slf4j-api 1.7.1-SNAPSHOT

rm -rf ~/.m2/repository/org/slf4j/slf4j-api/1.7.1-SNAPSHOT
mvn compile