tomcat7

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

Why would “java.lang.IllegalStateException: The resource configuration is not modifiable in this context.” appear deploying Jersey app?

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One possible cause is that you have two or more applicable mappings for that URL call. For example: @Path(“/{myParam}”) And somewhere else: @Path(“/{differentParam}”) Now Jersey have no way of telling what method is actually supposed to be called and gives this error.