title: NetBeans 8.0 doesn't clean a maven project
body: <p>I have a maven application , It never cleans , only buils directly or build with dependencies only .</p>
  
  <hr>
  
  <h2>Building Schedule Model 1.0</h2>
  
  <p>The POM for org.apache.maven.plugins:maven-clean-plugin:jar:2.4.1 is invalid, transitive dependencies (if any) will not be available, enable debug logging for more details</p>
  
  <p>--- maven-clean-plugin:2.4.1:clean (default-clean) @ Model ---</p>
  
  <h2>The POM for org.apache.maven.plugins:maven-clean-plugin:jar:2.4.1 is invalid, transitive dependencies (if any) will not be available, enable debug logging for more details</h2>
  
  <h2>BUILD FAILURE</h2>
  
  <p>Total time: 0.870s
  Finished at: Sun Jun 01 10:03:29 EET 2014</p>
  
  <h2>Final Memory: 5M/91M</h2>
  
  <h2>Failed to execute goal org.apache.maven.plugins:maven-clean-plugin:2.4.1:clean (default-clean) on project Model: Execution default-clean of goal org.apache.maven.plugins:maven-clean-plugin:2.4.1:clean failed: A required class was missing while executing org.apache.maven.plugins:maven-clean-plugin:2.4.1:clean: org/codehaus/plexus/util/Os</h2>
  
  <p>realm =    plugin>org.apache.maven.plugins:maven-clean-plugin:2.4.1
  strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
  urls[0] = file:/C:/Users/shaima/.m2/repository/org/apache/maven/plugins/maven-clean-plugin/2.4.1/maven-clean-plugin-2.4.1.jar
  urls[1] = file:/C:/Users/shaima/.m2/repository/org/codehaus/plexus/plexus-utils/1.1/plexus-utils-1.1.jar
  Number of foreign imports: 1
  import: Entry[import  from realm ClassRealm[maven.api, parent: null]]</p>
  
  <p>-----------------------------------------------------: org.codehaus.plexus.util.Os
  -> [Help 1]</p>
  
  <p>To see the full stack trace of the errors, re-run Maven with the -e switch.
  Re-run Maven using the -X switch to enable full debug logging.</p>
  
  <p>For more information about the errors and possible solutions, please read the following articles:
  [Help 1] <a href="http://cwiki.apache.org/confluence/display/MAVEN/PluginContainerException" rel="nofollow">http://cwiki.apache.org/confluence/display/MAVEN/PluginContainerException</a></p>