diff --git a/zxing.appspot.com/pom.xml b/zxing.appspot.com/pom.xml
index 49811f2ce..650387436 100644
--- a/zxing.appspot.com/pom.xml
+++ b/zxing.appspot.com/pom.xml
@@ -43,11 +43,19 @@
   </parent>
 
   <properties>
-    <gwt.version>2.5.1</gwt.version>
+    <gwt.version>2.6.0-rc1</gwt.version>
   </properties>
 
   <build>
     <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration>
+          <source>7</source>
+          <target>7</target>
+        </configuration>
+      </plugin>
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>gwt-maven-plugin</artifactId>
diff --git a/zxing.appspot.com/src/main/java/com/google/zxing/web/generator/client/Generator.java b/zxing.appspot.com/src/main/java/com/google/zxing/web/generator/client/Generator.java
index b780d9e66..4a9c259e7 100644
--- a/zxing.appspot.com/src/main/java/com/google/zxing/web/generator/client/Generator.java
+++ b/zxing.appspot.com/src/main/java/com/google/zxing/web/generator/client/Generator.java
@@ -45,7 +45,7 @@ import java.util.List;
 
 public final class Generator implements EntryPoint {
 
-  private final List<GeneratorSource> generators = new ArrayList<GeneratorSource>();
+  private final List<GeneratorSource> generators = new ArrayList<>();
   private final ListBox genList = new ListBox();
   private final ListBox sizeList = new ListBox();
   private final ListBox ecLevelList = new ListBox();