Maven 版本依赖
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【中文标题】Maven 版本依赖【英文标题】：Maven version dependency 【发布时间】：2019-01-24 07:36:38 【问题描述】：我想使用 Maven 将 spark-connector-cassandra 添加到我的 java 项目中。当我添加依赖项时，maven 无法识别版本（将其标记为红色）。为什么？我还添加了 spark 依赖项，但是有了这个依赖项就没有问题。 这是我的 pom 文件。
<?xml version="1.0" encoding="UTF-8"?>
<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>it.spark.test</groupId>
<artifactId>spark-count</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.11</artifactId>
<version>2.3.1</version>
</dependency>
<dependency>
<groupId>com.datastax.spark</groupId>
<artifactId>spark-cassandra-connector_2.11</artifactId>
<version>**2.3.0**</version>
</dependency>
</dependencies>
<properties>
<java.version>1.8</java.version>
</properties>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>$java.version</source>
<target>$java.version</target>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
粗体版本是问题所在。我该如何解决这个问题？谢谢 ;） 我厌倦了运行 mvn dependency:resolve 但这就是结果
C:\Users\Utente>mvn dependency:resolve
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256M; support was removed in 8.0
[INFO] Scanning for projects...
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-clean-plugin/2.5/maven-clean-plugin-2.5.pom
[WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:maven-clean-plugin:2.5: Plugin org.apache.maven.plugins:maven-clean-plugin:2.5 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-clean-plugin:jar:2.5
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-deploy-plugin/2.7/maven-deploy-plugin-2.7.pom
[WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:maven-deploy-plugin:2.7: Plugin org.apache.maven.plugins:maven-deploy-plugin:2.7 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-deploy-plugin:jar:2.7
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-site-plugin/3.3/maven-site-plugin-3.3.pom
[WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:maven-site-plugin:3.3: Plugin org.apache.maven.plugins:maven-site-plugin:3.3 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-site-plugin:jar:3.3
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-antrun-plugin/1.3/maven-antrun-plugin-1.3.pom
[WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:maven-antrun-plugin:1.3: Plugin org.apache.maven.plugins:maven-antrun-plugin:1.3 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-antrun-plugin:jar:1.3
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-assembly-plugin/2.2-beta-5/maven-assembly-plugin-2.2-beta-5.pom
[WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:maven-assembly-plugin:2.2-beta-5: Plugin org.apache.maven.plugins:maven-assembly-plugin:2.2-beta-5 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-assembly-plugin:jar:2.2-beta-5
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-dependency-plugin/2.8/maven-dependency-plugin-2.8.pom
[WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:maven-dependency-plugin:2.8: Plugin org.apache.maven.plugins:maven-dependency-plugin:2.8 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-dependency-plugin:jar:2.8
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-release-plugin/2.3.2/maven-release-plugin-2.3.2.pom
[WARNING] Failed to retrieve plugin descriptor for org.apache.maven.plugins:maven-release-plugin:2.3.2: Plugin org.apache.maven.plugins:maven-release-plugin:2.3.2 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-release-plugin:jar:2.3.2
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-metadata.xml
Downloading: http://repo.maven.apache.org/maven2/org/codehaus/mojo/maven-metadata.xml
[WARNING] Could not transfer metadata org.apache.maven.plugins/maven-metadata.xml from/to central (http://repo.maven.apache.org/maven2): Connect to 10.0.3.69:3128 [/10.0.3.69] failed: Connection timed out: connect
[WARNING] Could not transfer metadata org.codehaus.mojo/maven-metadata.xml from/to central (http://repo.maven.apache.org/maven2): Connect to 10.0.3.69:3128 [/10.0.3.69] failed: Connection timed out: connect
[WARNING] Failure to transfer org.apache.maven.plugins/maven-metadata.xml from http://repo.maven.apache.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 metadata org.apache.maven.plugins/maven-metadata.xml from/to central (http://repo.maven.apache.org/maven2): Connect to 10.0.3.69:3128 [/10.0.3.69] failed: Connection timed out: connect
[WARNING] Failure to transfer org.codehaus.mojo/maven-metadata.xml from http://repo.maven.apache.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 metadata org.codehaus.mojo/maven-metadata.xml from/to central (http://repo.maven.apache.org/maven2): Connect to 10.0.3.69:3128 [/10.0.3.69] failed: Connection timed out: connect
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 02:50 min
[INFO] Finished at: 2018-08-17T11:54:53+01:00
[INFO] Final Memory: 7M/123M
[INFO] ------------------------------------------------------------------------
[ERROR] No plugin found for prefix 'dependency' in the current project and in the plugin groups [org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local (C:\Users\Utente\.m2\repository), central (http://repo.maven.apache.org/maven2)] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/NoPluginFoundForPrefixException
【问题讨论】：
这是错误依赖 'com.datastax.spark:spark-cassandra-connector_2.11:2.3.0' not found。我在这里找到了依赖项：mvnrepository.com/artifact/com.datastax.spark/… 如果您在没有** 的情况下正确提供依赖项，它将在 Maven Central 中找到，请参阅 search.maven.org/classic/… ...
【参考方案1】：
尝试运行mvn dependency:resolve，看看会发生什么。
当你说
maven 无法识别版本（标记为红色）
我认为这与 IDE 有关，因此您可能需要在 IDE 上重新加载项目（Maven 项目 > 在 IntelliJ 上重新导入）。但基本上mvn dependency:resolve 应该下载缺少的依赖项 (com.datastax.spark:spark-cassandra-connector_2.11:2.3.0)，现在应该可以从 IDE 获得它。
【讨论】：
我运行 mvn 依赖：解决。结果在我的问题中。谢谢;) @Francesco 您是否在代理 (10.0.3.69:3128) 后面？如果是这样，您需要在 settings.xml 中配置它：maven.apache.org/guides/mini/guide-proxies.html
在哪里可以找到 settings.xml？谢谢;)
settings.xml 位于~/.m2。
干得好。现在mvn依赖：解决工作，但之后我执行它，然后我运行我的程序我有这个异常：线程“main”中的异常java.lang.NoClassDefFoundError：org/apache/spark/sql/Dataset以上是关于Maven 版本依赖的主要内容，如果未能解决你的问题，请参考以下文章