debugging scala web artifact deployed on docker + tomcat, from intellij

STEP 1 - enable "Java Platform Debugger Architecture" port in docker

FROM tomcat:8.0.46-jre8                                                                                
                                                                                                       
ENV JAVA_OPTS="-Denvironment=local"                                                                    
#ENV CATALINA_OPTS="$CATALINA_OPTS -agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n"
                                                                                                       
ENV JPDA_ADDRESS 8000                                                                                  
COPY nlu-processor-service/target/*.war /usr/local/tomcat/webapps/nlu-processor-1.0.war
                                                                                                       
EXPOSE 8080                                                                                                                                            
CMD ["catalina.sh", "jpda", "run"]

If it's simply tomcat(without docker), create bin/setenv.sh and add jpda port address.

JPDA_OPTS="-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n"

STEP 2 - add remote debugging to intellij

Set the JPDA port as set in setenv.sh or Dockerfile