title: how to solve this eclipse launch error?
body: <p>I tried couple of answer to fix eclipse start-up problem.</p>
  
  <p>I tried </p>
  
  <pre><code>eclipse.exe -clean didn't work. 
  eclipse.exe -clean -data C:\prectice\java\ didn't work
  eclipse.exe -clean --lanuncher.ini elipse.ini didn't work.
  </code></pre>
  
  <p>Here is the error:-</p>
  
  <pre><code>An error has occurred. See the log file
  C:\app\eclipse\configuration\1361558300022.log.
  </code></pre>
  
  <p>I have no clue how to launch eclipse. Please just me how can I fix it. Thanks in advnace!</p>
  
  <p>Log file content:</p>
  
  <pre><code>!SESSION 2013-02-22 20:39:37.176 -----------------------------------------------
  eclipse.buildId=v21.1.0-569685
  java.version=1.7.0_15
  java.vendor=Oracle Corporation
  BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_US
  Framework arguments:  -product com.android.ide.eclipse.adt.package.product
  Command-line arguments:  -os win32 -ws win32 -arch x86 -product com.android.ide.eclipse.adt.package.product
  
  !ENTRY org.eclipse.osgi 4 0 2013-02-22 20:39:39.898
  !MESSAGE Application error
  !STACK 1
  java.lang.NoClassDefFoundError: com/mercury/javashared/agentloader/AgentBootstrap
      at org.eclipse.swt.widgets.Display.&lt;init&gt;(Display.java:480)
      at org.eclipse.ui.internal.Workbench.createDisplay(Workbench.java:716)
      at org.eclipse.ui.PlatformUI.createDisplay(PlatformUI.java:161)
      at org.eclipse.ui.internal.ide.application.IDEApplication.createDisplay(IDEApplication.java:154)
      at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:96)
      at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
      at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
      at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
      at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:353)
      at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
      at java.lang.reflect.Method.invoke(Unknown Source)
      at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629)
      at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
      at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
  Caused by: java.lang.ClassNotFoundException: com.mercury.javashared.agentloader.AgentBootstrap
      at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:501)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      ... 17 more
  </code></pre>