java.lang.IllegalArgumentException: The main resource set specified […] is not valid

Question

I\'m having trouble starting my Tomcat server, it used to work, but I did something wrong and now it throws me this exception:

Caused by: java.lang.IllegalAr         


        

Answer 1

For me, this was caused by a file permission issue. We use a different deployment strategy where I work (not something I can change) which means the webapp exists in a completely different directory to the normal Tomcat directory structure. The above exception occurred when the Tomcat runtime didn't have permission to access that directory.