CentOs 7.1 - Install Tomcat 8

I've just replied here that I had the same problem and fixed it by:

  1. giving tomcat user ownership of the whole tomcat directory:

    cd /opt && sudo chown -R tomcat tomcat/
    
  2. and commenting out below line in /etc/systemd/system/tomcat.service:

    Environment='CATALINA_OPTS=-Xms512M -Xmx1024M -server -XX:+UseParallelGC'
    

Hope it helps.