diff --git a/xmlunit.changes b/xmlunit.changes
index 2d85181..f1118c6 100644
--- a/xmlunit.changes
+++ b/xmlunit.changes
@@ -1,7 +1,14 @@
+-------------------------------------------------------------------
+Tue Sep 19 07:20:04 UTC 2017 - fstrba@suse.com
+
+- Specify java source and target level 1.6 in order to allow build
+  with jdk9
+- Clean spec file and fix duplicate waste rpmlint error
+
 -------------------------------------------------------------------
 Fri May 19 09:21:06 UTC 2017 - vsistek@suse.com
 
-- Add BuildRequires: javapackages-local (for maven conversions) 
+- Add BuildRequires: javapackages-local (for maven conversions) 
 
 -------------------------------------------------------------------
 Wed Mar 18 09:40:00 UTC 2015 - tchvatal@suse.com
diff --git a/xmlunit.spec b/xmlunit.spec
index 53783e3..398d9da 100644
--- a/xmlunit.spec
+++ b/xmlunit.spec
@@ -28,6 +28,7 @@ Source0:        http://download.sourceforge.net/%{name}/%{name}-%{version}-src.z
 Source1:        http://repo1.maven.org/maven2/%{name}/%{name}/%{version}/%{name}-%{version}.pom
 BuildRequires:  ant
 BuildRequires:  ant-junit
+BuildRequires:  fdupes
 # Needed for maven conversions
 BuildRequires:  javapackages-local
 BuildRequires:  javapackages-tools
@@ -77,7 +78,7 @@ EOF
 
 export CLASSPATH=
 export OPT_JAR_LIST="junit ant/ant-junit jaxp_transform_impl ant/ant-trax xalan-j2-serializer"
-ant -Dbuild.compiler=modern -Dhaltonfailure=yes jar javadocs
+ant -Djavac.source=1.6 -Djavac.target=1.6 -Dbuild.compiler=modern -Dhaltonfailure=yes jar javadocs
 
 %install
 mkdir -p %{buildroot}%{_javadir}
@@ -86,6 +87,7 @@ install -m 0644 build/lib/%{name}-%{version}.jar %{buildroot}%{_javadir}/%{name}
 # Javadoc
 mkdir -p %{buildroot}%{_javadocdir}/%{name}
 cp -pr build/doc/* %{buildroot}%{_javadocdir}/%{name}
+%fdupes -s %{buildroot}%{_javadocdir}/%{name}
 
 # poms
 install -d -m 755 %{buildroot}%{_mavenpomdir}
@@ -94,14 +96,12 @@ install -m 644 build/lib/%{name}-%{version}.pom \
 %add_maven_depmap
 
 %files
-%defattr(0644,root,root,0755)
 %doc README.txt LICENSE.txt
 %{_javadir}/%{name}.jar
 %{_mavenpomdir}/JPP-%{name}.pom
 %{_datadir}/maven-metadata/%{name}.xml
 
 %files javadoc
-%defattr(0644,root,root,0755)
 %doc userguide
 %{_javadocdir}/%{name}