diff --git a/src/main/java/org/apache/maven/doxia/book/context/BookContext.java b/src/main/java/org/apache/maven/doxia/book/context/BookContext.java
index 3e78b19..c019e2e 100644
--- a/src/main/java/org/apache/maven/doxia/book/context/BookContext.java
+++ b/src/main/java/org/apache/maven/doxia/book/context/BookContext.java
@@ -134,7 +134,7 @@ public Map<String, BookContext.BookFile> getFiles()
     {
         if ( files == null )
         {
-            files = new HashMap<String, BookContext.BookFile>();
+            files = new HashMap<>();
         }
 
         return files;
diff --git a/src/main/java/org/apache/maven/doxia/book/services/io/DefaultBookIo.java b/src/main/java/org/apache/maven/doxia/book/services/io/DefaultBookIo.java
index 2b07935..a55a7d4 100644
--- a/src/main/java/org/apache/maven/doxia/book/services/io/DefaultBookIo.java
+++ b/src/main/java/org/apache/maven/doxia/book/services/io/DefaultBookIo.java
@@ -131,7 +131,7 @@ else if ( name.endsWith( extension ) )
         {
             getLogger().debug( "Dumping document <-> id mapping:" );
 
-            Map<String, BookContext.BookFile> map = new TreeMap<String, BookContext.BookFile>( context.getFiles() );
+            Map<String, BookContext.BookFile> map = new TreeMap<>( context.getFiles() );
 
             for ( Map.Entry<String, BookContext.BookFile> entry : map.entrySet() )
             {
diff --git a/src/main/java/org/apache/maven/doxia/book/services/renderer/LatexBookRenderer.java b/src/main/java/org/apache/maven/doxia/book/services/renderer/LatexBookRenderer.java
index 7b3b333..666eba5 100644
--- a/src/main/java/org/apache/maven/doxia/book/services/renderer/LatexBookRenderer.java
+++ b/src/main/java/org/apache/maven/doxia/book/services/renderer/LatexBookRenderer.java
@@ -129,7 +129,7 @@ private void writeBook( BookModel book, BookContext context, PrintWriter writer
         // Process all the section documents and collect their names
         // ----------------------------------------------------------------------
 
-        Map<String, SectionInfo> sectionInfos = new HashMap<String, SectionInfo>();
+        Map<String, SectionInfo> sectionInfos = new HashMap<>();
 
         for ( Chapter chapter : book.getChapters() )
         {
diff --git a/src/main/java/org/apache/maven/doxia/book/services/validation/ValidationResult.java b/src/main/java/org/apache/maven/doxia/book/services/validation/ValidationResult.java
index 47e218c..6606d52 100644
--- a/src/main/java/org/apache/maven/doxia/book/services/validation/ValidationResult.java
+++ b/src/main/java/org/apache/maven/doxia/book/services/validation/ValidationResult.java
@@ -55,7 +55,7 @@ public List<String> getErrors()
     {
         if ( errors == null )
         {
-            errors = new ArrayList<String>();
+            errors = new ArrayList<>();
         }
 
         return errors;
@@ -70,7 +70,7 @@ public List<String> getWarnings()
     {
         if ( warnings == null )
         {
-            warnings = new ArrayList<String>();
+            warnings = new ArrayList<>();
         }
 
         return warnings;