diff --git a/.mvn/wrapper/maven-wrapper.properties b/.mvn/wrapper/maven-wrapper.properties
index 56bb0164ec17..be4fea70726b 100755
--- a/.mvn/wrapper/maven-wrapper.properties
+++ b/.mvn/wrapper/maven-wrapper.properties
@@ -1 +1 @@
-distributionUrl=https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.5.0/apache-maven-3.5.0-bin.zip
\ No newline at end of file
+distributionUrl=https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.6.3/apache-maven-3.6.3-bin.zip
diff --git a/.travis.yml b/.travis.yml
index 55e3db0f7528..28d739d7b132 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,10 +6,11 @@ language: java
 dist: trusty
 
 jdk:
-  - oraclejdk8
+  - openjdk8
+  - openjdk11
 
 env:
-  - MAVEN_VERSION=3.5.4
+  - MAVEN_VERSION=3.6.3
 
 install:
   - "mvn -N io.takari:maven:wrapper -Dmaven=${MAVEN_VERSION} -Dhttps.protocols=TLSv1.2"
diff --git a/pom.xml b/pom.xml
index af519f2cc2ab..f2eebe1c1c02 100644
--- a/pom.xml
+++ b/pom.xml
@@ -235,6 +235,7 @@
               </goals>
               <projectsDirectory>src/it/projects</projectsDirectory>
               <postBuildHookScript>verify</postBuildHookScript>
+              <preBuildHookScript>setup</preBuildHookScript>
             </configuration>
           </plugin>
           <plugin>
diff --git a/src/it/projects/no-overwrite/.flattened-pom.xml b/src/it/projects/no-overwrite/.flattened-pom.xml
index c7c5b9618a4c..27dc6199dba8 100644
--- a/src/it/projects/no-overwrite/.flattened-pom.xml
+++ b/src/it/projects/no-overwrite/.flattened-pom.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
+<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.codehaus.mojo.flatten.its</groupId>
diff --git a/src/it/projects/no-overwrite/verify.groovy b/src/it/projects/no-overwrite/verify.groovy
index bb001673354e..5c4dc10ae1f0 100644
--- a/src/it/projects/no-overwrite/verify.groovy
+++ b/src/it/projects/no-overwrite/verify.groovy
@@ -19,5 +19,6 @@
 
 File flattendPom = new File( basedir, '.flattened-pom.xml' )
 assert flattendPom.exists()
-assert System.currentTimeMillis() - flattendPom.lastModified() > 30*1000
+long now = System.currentTimeMillis()
+assert now - flattendPom.lastModified() > 20*1000
 
diff --git a/src/main/java/org/codehaus/mojo/flatten/FlattenMojo.java b/src/main/java/org/codehaus/mojo/flatten/FlattenMojo.java
index 4cde5d4bc942..b9cd7227b7e8 100644
--- a/src/main/java/org/codehaus/mojo/flatten/FlattenMojo.java
+++ b/src/main/java/org/codehaus/mojo/flatten/FlattenMojo.java
@@ -492,20 +492,25 @@ protected void writePom( Model pom, File pomFile, String headerComment )
     protected void writeStringToFile( String data, File file, String encoding )
         throws MojoExecutionException
     {
-        try (OutputStream outStream = new FileOutputStream( file ))
+
+        byte[] binaryData;
+
+        try
         {
-            byte[] binaryData = data.getBytes( encoding );
+            binaryData = data.getBytes( encoding );
 
             if ( file.isFile() && file.canRead() && file.length() == binaryData.length )
             {
-
                 try (InputStream inputStream = new FileInputStream( file ))
                 {
-                    byte[] buffer = new byte[ binaryData.length ];
+                    byte[] buffer = new byte[binaryData.length];
                     inputStream.read( buffer );
-                    if ( Arrays.equals( buffer, binaryData ) ) {
+                    if ( Arrays.equals( buffer, binaryData ) )
+                    {
+                        getLog().debug( "Arrays.equals( buffer, binaryData ) " );
                         return;
                     }
+                    getLog().debug( "Not Arrays.equals( buffer, binaryData ) " );
                 }
                 catch ( IOException e )
                 {
@@ -513,6 +518,16 @@ protected void writeStringToFile( String data, File file, String encoding )
                     getLog().debug( "Issue reading file: " + file.getPath(), e );
                 }
             }
+            else
+            {
+                getLog().debug( "file: " + file + ",file.length(): " + file.length() + ", binaryData.length: " + binaryData.length );
+            }
+        } catch ( IOException e )
+        {
+            throw new MojoExecutionException( "cannot read String as bytes" , e );
+        }
+        try (OutputStream outStream = new FileOutputStream( file ))
+        {
             outStream.write( binaryData );
         }
         catch ( IOException e )