Tomcat 7 – Servlet 3.0: Invalid byte tag in constant pool

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Adding

metadata-complete="true"

to your web.xml should sort the issue

<web-app version="3.0"
         xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         metadata-complete="true">

This tells tomcat not to scan classes for annotations: https://web.archive.org/web/20180510163848/http://www.tomcatexpert.com/blog/2011/10/12/how-use-fragments-and-annotations-configure-your-web-application

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