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ServletExec Self-Help: FAQ
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Faq ID 63
Product ServletExec
Category Session Tracking
Question Why do some of my servlets throw a ClassCastException when retrieving session data?
Answer When running your servlets outside the context of a web application, classes that are shared by multiple servlets (such as session data classes) must be placed in the Main ServletExec classpath instead of the Servlets directory. If they are placed in the Servlets directory then ClassCastExceptions will occur. This problem can likely be avoided by running your servlets inside the context of a web application (since each web application uses a single, custom classloader for loading all classes).

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