This problem basically occurs when you've different java versions for compiling the source code and for starting the Tomcat server.
Checks you've to do:
1. Java version of your IDE with what you compile the source code
2. Java version used by Tomcat
If the above mismatches, you'll face the error "SEVERE: Error filterStart" during the Tomcat server start and your web application will not be deployed.
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The java.beans package provides very useful classes [XMLEncoder / XMLDecoder] to save an object state [persist] into an XML file [Serialize] and easily read it back [De-serialize]. It's very helpful while debugging the state of objects especially in the production environments.
No need to provide any examples as the below are some useful links that already contains the same:
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