Try upgrade to latest 3.9.1

.travis.yml

@@ -1,3 +1,4 @@
+image: maven:latest
 osx_image: xcode9.3
 sudo: false
 
@@ -21,29 +22,22 @@ addons:
       - maven
 
 # Install OpenJDK 8 (Zulu) and Maven on Windows
-before_install:
-  - |
-    if [ "${TRAVIS_OS_NAME}" == windows ]; then
-      choco install -y zulu8
-      choco install -y maven
-      export PATH=/C/Program\ Files/Zulu/zulu-8/bin:/C/ProgramData/chocolatey/lib/maven/apache-maven-3.6.3/bin:$PATH
-      echo "PATH=${PATH}"
-    fi
+#before_install:
+    #  - |
+      #if [ "${TRAVIS_OS_NAME}" == windows ]; then
+      #choco install -y zulu8
+      #choco install -y maven
+      #export PATH=/C/Program\ Files/Zulu/zulu-8/bin:/C/ProgramData/chocolatey/lib/maven/apache-maven-3.6.3/bin:$PATH
+      #echo "PATH=${PATH}"
+    #fi
 
 install: /usr/bin/env true
 
 script: mvn clean install -V -B -s settings.xml -Dmaven.artifact.threads=64 -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn
 
-before_cache:
-  - |
-    find $HOME/.m2/repository/ -name *SNAPSHOT | xargs rm -Rf
-    if [ "${TRAVIS_OS_NAME}" == osx ]; then
-      brew cleanup
-    fi
-
-cache:
-  timeout: 1000
-  directories:
-    - "$HOME/.m2"
-    - $HOME/AppData/Local/Temp/chocolatey
-    - $HOME/Library/Caches/Homebrew
+#cache:
+  #  timeout: 5000
+  #directories:
+  #  - "$HOME/.m2"
+  #  - $HOME/AppData/Local/Temp/chocolatey
+#  - $HOME/Library/Caches/Homebrew