text: Q:
  
  No plugin found for prefix 'jetty' in the current project and in the plugin groups (local, central)
  
  In order to easily run my webapp, I decided to add Jetty to my single POM file.
  Following the official documentation, I added this to my <plugins>:
    <plugin>
      <groupId>org.eclipse.jetty</groupId>
      <artifactId>jetty-maven-plugin</artifactId>
      <version>9.4.0-SNAPSHOT</version>
    </plugin>
  
  PROBLEM: mvn jetty:run fails:
  $ mvn jetty:start
  [INFO] Scanning for projects...
  [WARNING] The POM for org.eclipse.jetty:jetty-maven-plugin:jar:9.4.0-SNAPSHOT is missing, no dependency information available
  [WARNING] Failed to retrieve plugin descriptor for org.eclipse.jetty:jetty-maven-plugin:9.4.0-SNAPSHOT: Plugin org.eclipse.jetty:jetty-maven-plugin:9.4.0-SNAPSHOT or one of its dependencies could not be resolved: Could not find artifact org.eclipse.jetty:jetty-maven-plugin:jar:9.4.0-SNAPSHOT
  Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-metadata.xml
  Downloading: https://repo.maven.apache.org/maven2/org/codehaus/mojo/maven-metadata.xml
  Downloaded: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-metadata.xml (13 KB at 2.1 KB/sec)
  Downloaded: https://repo.maven.apache.org/maven2/org/codehaus/mojo/maven-metadata.xml (20 KB at 3.2 KB/sec)
  [INFO] ------------------------------------------------------------------------
  [INFO] BUILD FAILURE
  [INFO] ------------------------------------------------------------------------
  [INFO] Total time: 7.013 s
  [INFO] Finished at: 2016-08-17T16:49:28+09:00
  [INFO] Final Memory: 14M/307M
  [INFO] ------------------------------------------------------------------------
  [ERROR] No plugin found for prefix 'jetty' in the current project and in the plugin groups [org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local (/home/nico/.m2/repository), central (https://repo.maven.apache.org/maven2)] -> [Help 1]
  
  Another approach at https://mvnrepository.com/artifact/org.eclipse.jetty/jetty-maven-plugin/9.4.0.M0 suggests to add this in <dependencies>:
              <dependency>
                  <groupId>org.eclipse.jetty</groupId>
                  <artifactId>jetty-maven-plugin</artifactId>
                  <version>9.4.0.M0</version>
              </dependency>
  
  It fails too, mvn jetty:start says:
  [ERROR] No plugin found for prefix 'jetty' in the current project and in the plugin groups [org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local (/home/nico/.m2/repository), central (https://repo.maven.apache.org/maven2)] -> [Help 1]
  
  I removed my .m2 folder and let Maven recreate it, no better. I have no settings.xml in ~/.m2 and here is the content of ~/.m2/repository/org/eclipse/jetty/jetty-maven-plugin/9.4.0.M0/:
  -rw-rw-r-- 1 nico nico 101524  8月 24 17:29 jetty-maven-plugin-9.4.0.M0.jar
  -rw-rw-r-- 1 nico nico     40  8月 24 17:29 jetty-maven-plugin-9.4.0.M0.jar.sha1
  -rw-rw-r-- 1 nico nico   5526  8月 24 17:28 jetty-maven-plugin-9.4.0.M0.pom
  -rw-rw-r-- 1 nico nico     40  8月 24 17:28 jetty-maven-plugin-9.4.0.M0.pom.sha1
  -rw-rw-r-- 1 nico nico    215  8月 24 17:29 _remote.repositories
  
  Note: There are several questions on the same topic, all have outdated answers containing Maven ids (mortbay, codehaus) dating from before Jetty moved to Eclipse, or suggest adding the <plugin> block seen at the top of my question.
  
  A:
  
  You are using the Plugin version 9.4.0-SNAPSHOT. This version is not available in the central repo (available versions).
  To add a dependency doesn't solve the problem because a dependency is not the same as a plugin. A dependency is used or required by the code you want to compile and a plugin is something that would compile, build or analyze your code.
  In short:
  
  you don't need a dependency on jetty-maven-plugin
  you have to change the version of the plugin to a version which is available in the central or your local repo.For example:
  <plugin>
      <groupId>org.eclipse.jetty</groupId>
      <artifactId>jetty-maven-plugin</artifactId>
      <version>9.4.0.M0</version>
  </plugin>
  
  A:
  
  Please edit the settings.xml file in the local repository with the following information
  <settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
                        http://maven.apache.org/xsd/settings-1.0.0.xsd">
    <localRepository>${user.home}/.m2/repository</localRepository>
    <interactiveMode>true</interactiveMode>
    <usePluginRegistry>false</usePluginRegistry>
    <offline>false</offline>
    <pluginGroups>
      <pluginGroup>org.mortbay.jetty</pluginGroup>
    </pluginGroups>
  </settings>
  
  It's working for me.
  
  