ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/servlet/HttpConstraintElement

Make sure you declare your servlets dependency with the provided scope. And if you still have the problem, you could switch to another servlets dependency (from jetty, tomcat, glass dish, etc.) or configure the gwt-maven-plugin to put GWT first in the classpath, so that the servlets classes it bundles are picked rather than those from your declared dependency.

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