If you run into a “ClassNotFoundException: DefaultSecurityConfig” running Grails tests from IntelliJ IDEA, with the stacktrace below
java.lang.RuntimeException: java.lang.ClassNotFoundException: DefaultSecurityConfig at SpringSecurityCoreGrailsPlugin$_closure1.doCall(SpringSecurityCoreGrailsPlugin.groovy:151) (... snip ...) Caused by: java.lang.ClassNotFoundException: DefaultSecurityConfig ... 61 more | Error Error generating web.xml file
then try deleting the cached grails projects. For me the solution was to delete the projects in C:\Users\myuser\.grails\2.2.2\projects.
After that, the exception was gone.
This solved my issue as well. Good to see fellow Grails developer on a Windows workstation!