title: maven... Failed to clean project: Failed to delete ..\org.ow2.util.asm-asm-tree-3.1.jar
body: <p>I use STS(spring tool suite) + maven plugin.</p>
  
  <p>Every time when I run my application using <code>maven-clean</code> I see following error:</p>
  
  <pre><code>[INFO] Scanning for projects...
  [INFO]                                                                         
  [INFO] ------------------------------------------------------------------------
  [INFO] Building hhsystem ui 1.0.0-SNAPSHOT
  [INFO] ------------------------------------------------------------------------
  [INFO] 
  [INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ ui ---
  [INFO] Deleting C:\Users\Nikolay_Tkachev\workspace\HHSystem\UI\target
  [INFO] ------------------------------------------------------------------------
  [INFO] BUILD FAILURE
  [INFO] ------------------------------------------------------------------------
  [INFO] Total time: 0.471s
  [INFO] Finished at: Mon Oct 21 12:34:33 MSK 2013
  [INFO] Final Memory: 2M/90M
  [INFO] ------------------------------------------------------------------------
  [ERROR] Failed to execute goal org.apache.maven.plugins:maven-clean-plugin:2.4.1:clean (default-clean) on project ui: Failed to clean project: Failed to delete C:\Users\Nikolay_Tkachev\workspace\HHSystem\UI\target\org.ow2.util.asm-asm-tree-3.1.jar -&gt; [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/MojoExecutionException
  </code></pre>
  
  <p>I have to close STS and go to <code>C:\Users\Nikolay_Tkachev\workspace\HHSystem\UI\target</code> and delete <code>org.ow2.util.asm-asm-tree-3.1.jar</code></p>
  
  <p>After starting STS again it works, but this is a hassle.</p>
  
  <p>Can you help me with this problem?</p>
  
  <p><strong>UPDATE</strong><br>
  for Kalathoki L.</p>
  
  <p>I run <code>maven-clean</code> from this state:</p>
  
  <p><img src="https://i.stack.imgur.com/5o1ZP.jpg" alt="STS screen shot"></p>
  
  <p>I see same behaviour from the command line as from the eclipse plugin</p>
  
  <p>If I watch unlocker when STS is running I see</p>
  
  <p><img src="https://i.stack.imgur.com/9b4oS.jpg" alt="unlocker screen shot">:</p>