Issue checkstyle#11747: Migrate codenarc to travis CI

.ci/codenarc.sh

@@ -1,6 +1,5 @@
 #!/bin/bash
 # Attention, there is no "-x" to avoid problems on Travis
-set -e
 
 CODENARC_REPORT=$(groovy ./.ci/codenarc.groovy ./.ci/ *.groovy)
 CLEAN_CODENARC_REPORT="(p1=0; p2=0; p3=0)"

.ci/error-prone-check.groovy

@@ -2,6 +2,7 @@ import groovy.transform.EqualsAndHashCode
 import groovy.transform.Field
 import groovy.transform.Immutable
 import groovy.xml.XmlUtil
+import groovy.xml.XmlUtil
 
 import java.util.regex.Matcher
 import java.util.regex.Pattern

.travis.yml

@@ -11,6 +11,7 @@ cache:
 addons:
   apt:
     packages:
+      - groovy
       - xsltproc
       - xmlstarlet
 
@@ -43,13 +44,26 @@ jobs:
         - USE_MAVEN_REPO="true"
         - CMD="./.ci/travis.sh jacoco"
 
+    - jdk: openjdk11
+      env:
+        - DESC="codenarc analysis"
+        - CMD="./.ci/codenarc.sh"
+
     # Ensure that all modules are used in no exception configs
     - env:
         - DESC="ensure that all modules are used in no exception configs"
         - CMD1="export PULL_REQUEST=$TRAVIS_PULL_REQUEST"
         - CMD2="./.ci/validation.sh verify-no-exception-configs"
         - CMD="$CMD1 && $CMD2"
 
+before_script:
+  - |
+    if [[ $TRAVIS_CPU_ARCH == 'ppc64le' ]]; then
+        export JAVA_HOME=/usr/lib/jvm/adoptopenjdk-11-hotspot-ppc64el
+        export PATH=$JAVA_HOME/bin:$PATH
+    fi
+  - groovy --version
+
 script:
   # manually set JAVA_HOME to overcome issue with travis ci noted at
   # https://github.com/checkstyle/checkstyle/pull/11699#issue-1261272652