title: Error in converted maven project in Eclipse
body: <p>I am using Eclipse Juno with the m2e plugin. I converted my java project into a maven project via Eclipse</p>
  
  <blockquote>
    <p>Right click on project > goto menu configure > Convert to maven project.</p>
  </blockquote>
  
  <p><img src="https://i.stack.imgur.com/FYWZL.png" alt="thats my pom.xml file"></p>
  
  <p>And these are the errors:</p>
  
  <pre><code>Multiple annotations found at this line:
  - Plugin execution not covered by lifecycle configuration: org.apache.maven.plugins:maven-compiler-
   plugin:2.3.2:compile (execution: default-compile, phase: compile)
  - Plugin execution not covered by lifecycle configuration: org.apache.maven.plugins:maven-compiler-
   plugin:2.3.2:testCompile (execution: default-testCompile, phase: test-compile)
  - CoreException: Could not get the value for parameter compilerId for plugin execution default-
   compile: PluginResolutionException: Plugin org.apache.maven.plugins:maven-compiler-plugin:2.3.2 or one of 
   its dependencies could not be resolved: The following artifacts could not be resolved: 
   org.codehaus.plexus:plexus-compiler-manager:jar:1.8.1, org.codehaus.plexus:plexus-compiler-javac:jar:1.8.1: 
   Failure to transfer org.codehaus.plexus:plexus-compiler-manager:jar:1.8.1 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 artifact org.codehaus.plexus:plexus-compiler-
   manager:jar:1.8.1 from/to central (http://repo.maven.apache.org/maven2): connection timed out to http://
   repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-compiler-manager/1.8.1/plexus-compiler-
   manager-1.8.1.jar
  - CoreException: Could not get the value for parameter compilerId for plugin execution default-
   testCompile: PluginResolutionException: Plugin org.apache.maven.plugins:maven-compiler-plugin:2.3.2 or one 
   of its dependencies could not be resolved: The following artifacts could not be resolved: 
   org.codehaus.plexus:plexus-compiler-manager:jar:1.8.1, org.codehaus.plexus:plexus-compiler-javac:jar:1.8.1: 
   Failure to transfer org.codehaus.plexus:plexus-compiler-manager:jar:1.8.1 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 artifact org.codehaus.plexus:plexus-compiler-
   manager:jar:1.8.1 from/to central (http://repo.maven.apache.org/maven2): connection timed out to http://
   repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-compiler-manager/1.8.1/plexus-compiler-
   manager-1.8.1.jar
  </code></pre>
  
  <p>How to solve this problem?
  Please help.</p>