inside the poml use checkstyle.version 6.11.2 by default and remove the profile that gets activated with java7...if one wants to use a different checkstyle version provide the desired version via command-line args like 'mvn clean verify -Pcheckstyle -Dcheckstyle.version=8.2 -Dmaven.test.skip=true -B'

Author: TheSnoozer

.travis.yml

@@ -29,7 +29,7 @@ matrix:
     env: CUSTOM_MVN_VERION="3.5.0"
   - stage: checkstyle
     jdk: oraclejdk9
-    script: mvn clean verify -Pcheckstyle -Dmaven.test.skip=true -B
+    script: mvn clean verify -Pcheckstyle -Dcheckstyle.version=8.2 -Dmaven.test.skip=true -B
 
 install:
   - if [[ -n "${CUSTOM_MVN_VERION}" ]]; then

pom.xml

@@ -419,22 +419,12 @@
         </plugins>
       </build>
     </profile>
-    <profile>
-      <id>checkstyleWithJdk17</id>
-      <activation>
-        <jdk>1.7</jdk>
-      </activation>
-      <properties>
-        <!--  if you update the checkstyle version make sure you update the google_checks.xml inside the repository -->
-        <checkstyle.version>6.11.2</checkstyle.version>
-      </properties>
-    </profile>
     <profile>
       <id>checkstyle</id>
       <properties>
         <maven-checkstyle-plugin.version>2.17</maven-checkstyle-plugin.version>
         <!--  if you update the checkstyle version make sure you update the google_checks.xml inside the repository -->
-        <checkstyle.version>8.2</checkstyle.version>
+        <checkstyle.version>6.11.2</checkstyle.version>
       </properties>
       <build>
         <pluginManagement>