Maven install error: Dependency could not be resolved

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I am using Maven 3.1.1. When I run mvn install I get the following error:

D:\spring source>mvn install
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building SpringDependencies 1.0
[INFO] ------------------------------------------------------------------------
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-
dependency-plugin/2.8/maven-dependency-plugin-2.8.pom
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.648s
[INFO] Finished at: Mon Dec 16 15:01:47 IST 2013
[INFO] Final Memory: 4M/15M
[INFO] ------------------------------------------------------------------------
[ERROR] Plugin org.apache.maven.plugins:maven-dependency-plugin:2.8 or one of it
s dependencies could not be resolved: Failed to read artifact descriptor for org
.apache.maven.plugins:maven-dependency-plugin:jar:2.8: Could not transfer artifa
ct org.apache.maven.plugins:maven-dependency-plugin:pom:2.8 from/to central (htt
p://repo.maven.apache.org/maven2): repo.maven.apache.org: Unknown host repo.mave
n.apache.org -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e swit
ch.
[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 rea
d the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginResoluti
onException

My pom.xml is:

<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>spring-source-download</groupId>
  <artifactId>SpringDependencies</artifactId>
  <version>1.0</version>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  <dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>4.0.0.RELEASE</version>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-dependency-plugin</artifactId>
            <version>3.1.1</version>
            <executions>
              <execution>
                <id>download-dependencies</id>
                  <phase>generate-resources</phase>
                    <goals>
                      <goal>copy-dependencies</goal>
                    </goals>
                    <configuration>
                      <outputDirectory> ${project.build.directory}/dependencies </outputDirectory>
                    </configuration>
              </execution>
            </executions>
      </plugin>
    </plugins>
  </build>
</project>
maven-3 maven
7 Answers

Disconnect from VPN and then run the command.

user_8968860

Where is my Settings.xml?

Windows users

It's in your C:/Users/<Username>/.m2/settings.xml

Also, this is for specific user. Global one can be present at :

<Maven-Installation-Directory>/conf/settings.xml

But changing the User one might solve the issue if you can't find the global one.

Also, equally important, go to Preferences in Eclipse/STS:

  • Goto Maven -> User Settings and verify if both global and user settings.xml files are mentioned in the properties, if not mention them by browsing.

1. Proxy Issue

Check Windows Proxy Setting. If there is any proxy which your computer is using then you need to add proxy settings in your settings.xml file too.

Just add this chunk of code in your settings.xml

<proxies>
   <proxy>
      <id>proxy-id</id>
      <active>true</active>
      <protocol>http</protocol>
      <host>ca-something.net</host>
      <port>80</port>
      <nonProxyHosts>localhost|10.140.240.90.*</nonProxyHosts>
    </proxy>
  </proxies>

2. Protocol Issue

Visit http://repo.maven.apache.org/: If it says Https required.

Then, you need to add this chunk of code to your settings.xml inside <mirrors>

<mirror>
  <id>central-secure</id>
  <url>https://repo.maven.apache.org/maven2</url>
  <mirrorOf>central</mirrorOf>
</mirror>

Now it should be good to go.

3. None of the above works

Try disconnecting any company private VPN and try mvn clean build.

user_61728570
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