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    <p>Philippe Riand explaned this by email:</p> <blockquote> <p>This class cast happens because the same class had been loaded twice by 2 different class loaders. Thus, from a Java standpoint, they are different and the cast fails.</p> <p>Now, each XPages application is having its own classloader. But this class loader is discarded each time a design change happens to the application, through Domino Designer for example. This is required as a change to an XPages generates a new Java class that should then be loaded instead of the previous one. When this happens, the classloader is discarded and a new is created. Then all the application related classes are reloaded, as they are needed, even though they didn't change.This is a common behavior implemented by J2EE servers. That said, if your code is caching an object in a scope that is <em>not</em> discarded when a design change occurs, then this is likely to happen. For example, the applicationScope &amp; sessionScope are currently not discarded when a design change happens, which might lead to this problem. This was a design choice as discarding the scopes sometimes provides a bad developer experience, but with this drawback.</p> <p>Finally, saving faces-config.xml works as a workaround. When this file is saved, then the entire module is discarded from memory, including the scopes, This explains why it works. Making a change to your custom Java class should reload the module and remove the issue.</p> </blockquote> <p>So it seems putting beans (even indirectly) into sessionScope or applicationScope is the cause.</p>
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    1. COThis is also the case for a Java object consuming another managed bean either by variable resolver or as a parameter. When you call this Java object from SSJS and modify the XPage containing the SSJS code, it will fail until you modify a Java class, clean project or saving faces-config.xml.
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      1. USSerdar Basegmez
 

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