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    <p>Check your <a href="http://wiki.eclipse.org/Build.properties" rel="nofollow noreferrer"><strong><code>build.properties</code></strong></a> section</p> <p>If it doesn't properly specify what's supposed to be in the final binary result, it will not work. Check the .class files are where the MANIFEST.MF says they will be.</p> <hr> <p>from <a href="http://www.eclipsezone.com/eclipse/forums/t99010.rhtml" rel="nofollow noreferrer">EclipseZone</a>, another reason for this error message:</p> <blockquote> <p>If you see a message in the log like</p> </blockquote> <pre><code> The activator org.example.FooActivator for bundle org.example.foo is invalid </code></pre> <blockquote> <p>, then this usually means there has been a <code>ClassNotFoundException</code> trying to load the class in the first place, before it's even got to the start() method.</p> </blockquote> <hr> <p><a href="https://stackoverflow.com/users/134263/penguru">penguru</a> adds:</p> <blockquote> <p>The error occurs when I try create a new object from any other class in the constructor of activator class. Isn't it legal to create an object in activator plugin ?</p> </blockquote> <ul> <li>If that class if from another plugin which has not yet been "activated", that could be your problem. </li> <li>If that class is not found, that would also invalidate your plugin activator.</li> </ul> <p>Basic advice: you may be better off with your initializations done in the <a href="http://www.eclipse.org/ecf/org.eclipse.ecf.docs/api/org/eclipse/ecf/call/Activator.html#start(org.osgi.framework.BundleContext)" rel="nofollow noreferrer"><code>start()</code> method</a> of <code>Activator</code> rather than its constructor.</p>
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    1. COI found the bug after long debugging session with breakpoints :) Somewhere in the code, I try to add an element to null array list! I focused on the bundle error and could not see it. Also, there was no exception for the array list. But, it's very interesting that, if I don't use a breakpoint, the debug session does not go into the class that contains the bug. The debug session terminates with the exception when I try create the object. So, we can say this is exactly ClassNotFoundException :)
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    2. COThanks for help..
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