title: NumberFormatException on eclipse start
body: <p>I'm a novice at Java and eclipse IDE. I'm trying to create a plugin to my installed eclipse 4.4.0 by <a href="http://www.eclipse.org/articles/Article-Launch-Framework/launch.html" rel="nofollow">the official IBM article</a>.
  I've added plug-in description to the plugin.xml:</p>
  
  
  
  <pre class="lang-xml prettyprint-override"><code>&lt;extension point="org.eclipse.debug.core.launchConfigurationTypes"&gt;
      &lt;launchConfigurationType
          name="MyConfiguration"
          delegate="com.myplugin.first.launching.MyLaunchConfiguration"
          modes="run, debug"               
          id="com.myplugin.first.launching.myConfiguration"&gt;        
      &lt;/launchConfigurationType&gt;
  &lt;/extension&gt;
  </code></pre>
  
  <p>and I've created empty configuration delegate with required dependencies.
  Unfortunately I cannot launch a new eclipse application with my plugin because every time I get the following error:</p>
  
  <pre>
  
      java.lang.NumberFormatException: For input string: ""
          at java.lang.NumberFormatException.forInputString(Unknown Source)
          at java.lang.Integer.parseInt(Unknown Source)
          at java.lang.Integer.parseInt(Unknown Source)
          at org.eclipse.osgi.storagemanager.StorageManager.updateTable(StorageManager.java:511)
          at org.eclipse.osgi.storagemanager.StorageManager.open(StorageManager.java:708)
          at org.eclipse.osgi.storage.Storage.getChildStorageManager(Storage.java:1747)
          at org.eclipse.osgi.storage.Storage.getInfoInputStream(Storage.java:1764)
          at org.eclipse.osgi.storage.Storage.(Storage.java:124)
          at org.eclipse.osgi.storage.Storage.createStorage(Storage.java:84)
          at org.eclipse.osgi.internal.framework.EquinoxContainer.(EquinoxContainer.java:75)
          at org.eclipse.osgi.launch.Equinox.(Equinox.java:31)
          at org.eclipse.core.runtime.adaptor.EclipseStarter.startup(EclipseStarter.java:297)
          at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:232)
          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:648)
          at org.eclipse.equinox.launcher.Main.basicRun(Main.java:603)
          at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
          at org.eclipse.equinox.launcher.Main.main(Main.java:1438)
      An error has occurred. See the log file
      null.
  
  </pre>
  
  <p>I have not found the log file with the error.
  What's wrong? What should I do?</p>
  
  <p>Maybe somebody knows the problem.</p>