diff --git a/src/tutorial/Employee.java b/src/tutorial/Employee.java
index 7ec526e..c9f0559 100644
--- a/src/tutorial/Employee.java
+++ b/src/tutorial/Employee.java
@@ -1,5 +1,5 @@
 /**
- * Automatically generated by Zserio Java generator version 1.1.1 using Zserio core 2.14.1.
+ * Automatically generated by Zserio Java generator version 1.1.2 using Zserio core 2.15.0.
  * Generator setup: writerCode, pubsubCode, serviceCode, sqlCode.
  */
 
@@ -103,7 +103,7 @@ public void setBonus(java.lang.Integer bonus_)
 
     public boolean isBonusUsed()
     {
-        return isBonusSet();
+        return (bonus_ != null);
     }
 
     public boolean isBonusSet()
diff --git a/src/tutorial/Experience.java b/src/tutorial/Experience.java
index 8f6964a..6a99ab7 100644
--- a/src/tutorial/Experience.java
+++ b/src/tutorial/Experience.java
@@ -1,5 +1,5 @@
 /**
- * Automatically generated by Zserio Java generator version 1.1.1 using Zserio core 2.14.1.
+ * Automatically generated by Zserio Java generator version 1.1.2 using Zserio core 2.15.0.
  * Generator setup: writerCode, pubsubCode, serviceCode, sqlCode.
  */
 
diff --git a/src/tutorial/Language.java b/src/tutorial/Language.java
index 9b425cb..6897eda 100644
--- a/src/tutorial/Language.java
+++ b/src/tutorial/Language.java
@@ -1,5 +1,5 @@
 /**
- * Automatically generated by Zserio Java generator version 1.1.1 using Zserio core 2.14.1.
+ * Automatically generated by Zserio Java generator version 1.1.2 using Zserio core 2.15.0.
  * Generator setup: writerCode, pubsubCode, serviceCode, sqlCode.
  */
 
diff --git a/src/tutorial/Role.java b/src/tutorial/Role.java
index 25621a3..59cc390 100644
--- a/src/tutorial/Role.java
+++ b/src/tutorial/Role.java
@@ -1,5 +1,5 @@
 /**
- * Automatically generated by Zserio Java generator version 1.1.1 using Zserio core 2.14.1.
+ * Automatically generated by Zserio Java generator version 1.1.2 using Zserio core 2.15.0.
  * Generator setup: writerCode, pubsubCode, serviceCode, sqlCode.
  */