java_gen: make OFFactory be a XidGenerator
diff --git a/java_gen/templates/of_interface.java b/java_gen/templates/of_interface.java
index 8c9bf25..98d7b9e 100644
--- a/java_gen/templates/of_interface.java
+++ b/java_gen/templates/of_interface.java
@@ -50,7 +50,7 @@
//:: for prop in msg.members:
${prop.java_type.public_type} ${prop.getter_name}()${ "" if prop.is_universal else " throws UnsupportedOperationException"};
//:: if prop.is_writeable:
- Builder ${prop.setter_name}(${prop.java_type.public_type} ${prop.name})${ "" if prop.is_universal else " throws UnsupportedOperationException"};
+ Builder${msg.type_variable} ${prop.setter_name}(${prop.java_type.public_type} ${prop.name})${ "" if prop.is_universal else " throws UnsupportedOperationException"};
//:: #endif
//:: #endfor
}