diff --git a/java_gen/templates/of_class.java b/java_gen/templates/of_class.java
index 51fbf5c..772858a 100644
--- a/java_gen/templates/of_class.java
+++ b/java_gen/templates/of_class.java
@@ -157,7 +157,7 @@
         @Override
         public int write(ChannelBuffer bb, ${impl_class} message) {
 //:: if not msg.is_fixed_length:
-            int startIndex = bb.readerIndex();
+            int startIndex = bb.writerIndex();
 //:: #end
 
 //:: fields_with_length_member = {}
diff --git a/java_gen/templates/of_interface.java b/java_gen/templates/of_interface.java
index e8e15c0..af6493e 100644
--- a/java_gen/templates/of_interface.java
+++ b/java_gen/templates/of_interface.java
@@ -36,7 +36,7 @@
 //:: include("_imports.java", msg=msg)
 
 public interface ${msg.name} ${"extends %s" % msg.parent_interface if msg.parent_interface else ""} {
-//:: for prop in (prop for prop in msg.members):
+//:: for prop in msg.members:
     ${prop.java_type.public_type} get${prop.title_name}()${ "" if prop.is_universal else " throws UnsupportedOperationException"};
 //:: #endfor