diff --git a/druid-spring-boot-autoconfigure/pom.xml b/druid-spring-boot-autoconfigure/pom.xml
index 7af6375..3028939 100644
--- a/druid-spring-boot-autoconfigure/pom.xml
+++ b/druid-spring-boot-autoconfigure/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>com.github.drtrang</groupId>
         <artifactId>druid-spring-boot</artifactId>
-        <version>1.0.3</version>
+        <version>1.0.4-SNAPSHOT</version>
     </parent>
 
     <artifactId>druid-spring-boot-autoconfigure</artifactId>
diff --git a/druid-spring-boot-samples/pom.xml b/druid-spring-boot-samples/pom.xml
index fcbf498..fddd62e 100644
--- a/druid-spring-boot-samples/pom.xml
+++ b/druid-spring-boot-samples/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>com.github.drtrang</groupId>
         <artifactId>druid-spring-boot</artifactId>
-        <version>1.0.3</version>
+        <version>1.0.4-SNAPSHOT</version>
     </parent>
 
     <artifactId>druid-spring-boot-samples</artifactId>
diff --git a/druid-spring-boot-samples/src/main/java/com/github/trang/druid/DruidSpringBootStarterApplication.java b/druid-spring-boot-samples/src/main/java/com/github/trang/druid/DruidSpringBootStarterApplication.java
index 646c90b..220438f 100644
--- a/druid-spring-boot-samples/src/main/java/com/github/trang/druid/DruidSpringBootStarterApplication.java
+++ b/druid-spring-boot-samples/src/main/java/com/github/trang/druid/DruidSpringBootStarterApplication.java
@@ -7,6 +7,8 @@ import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
+import java.util.Optional;
+
 /**
  * DruidSpringBootStarterApplication
  *
@@ -22,11 +24,12 @@ public class DruidSpringBootStarterApplication implements CommandLineRunner {
     }
 
     @Autowired
-    private CityMapper cityMapper;
+    private Optional<CityMapper> cityMapper;
 
     @Override
     public void run(String... args) throws Exception {
-        System.out.println(cityMapper.findAll());
+        cityMapper.map(CityMapper::findAll)
+                .ifPresent(cities -> cities.forEach(System.out::println));
     }
 
 }
\ No newline at end of file
diff --git a/druid-spring-boot-starter/pom.xml b/druid-spring-boot-starter/pom.xml
index 42c838d..c517cde 100644
--- a/druid-spring-boot-starter/pom.xml
+++ b/druid-spring-boot-starter/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>com.github.drtrang</groupId>
         <artifactId>druid-spring-boot</artifactId>
-        <version>1.0.3</version>
+        <version>1.0.4-SNAPSHOT</version>
     </parent>
 
     <artifactId>druid-spring-boot-starter</artifactId>
diff --git a/pom.xml b/pom.xml
index d108ba2..020efe4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
 
     <groupId>com.github.drtrang</groupId>
     <artifactId>druid-spring-boot</artifactId>
-    <version>1.0.3</version>
+    <version>1.0.4-SNAPSHOT</version>
     <packaging>pom</packaging>
 
     <name>${project.artifactId}</name>
@@ -275,6 +275,7 @@
                     <encoding>${project.build.sourceEncoding}</encoding>
                     <source>${java.version}</source>
                     <target>${java.version}</target>
+                    <compilerArgument>-parameters</compilerArgument>
                 </configuration>
             </plugin>
             <plugin>