Fix build issues after latest Travis changes

.travis.yml

@@ -1,3 +1,4 @@
+image: maven:latest
 osx_image: xcode9.3
 sudo: false
 
@@ -25,24 +26,17 @@ 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
+      choco install -y maven --version 3.8.1
+      export PATH=/C/Program\ Files/Zulu/zulu-8/bin:/C/ProgramData/chocolatey/lib/maven/apache-maven-3.8.1/bin:$PATH
       echo "PATH=${PATH}"
     fi
 
 install: /usr/bin/env true
 
-script: mvn clean install -V -B -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
+script: mvn clean install -V -B -s settings.xml -Dmaven.artifact.threads=64 -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn
 
 cache:
-  timeout: 1000
+  #  timeout: 5000
   directories:
     - "$HOME/.m2"
     - $HOME/AppData/Local/Temp/chocolatey

pom.xml

@@ -122,7 +122,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-site-plugin</artifactId>
-                    <version>3.9.0</version>
+                    <version>3.9.1</version>
                     <executions>
                         <execution>
                             <id>attach-descriptor</id>

settings.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright (C) 2008 Mycila (mathieu.carbou@gmail.com)
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+            http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+-->
+<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
+  <mirrors>
+    <mirror>
+      <id>maven-central</id>
+      <name>Maven Central</name>
+      <url>https://repo1.maven.org/maven2</url>
+      <mirrorOf>central</mirrorOf>
+    </mirror>
+  </mirrors>
+</settings>