diff --git a/annotation/definition.go b/annotation/definition.go
index c53a0a6..5718412 100644
--- a/annotation/definition.go
+++ b/annotation/definition.go
@@ -1,8 +1,11 @@
 package annotation
 
 import (
+	"fmt"
 	"reflect"
 
+	"git.loafle.net/commons_go/logging"
+
 	cdur "git.loafle.net/commons_go/di/util/reflect"
 )
 
@@ -13,6 +16,10 @@ func init() {
 }
 
 func RegisterAnnotation(name string, t reflect.Type) {
+	if _, ok := annotationRegistry[name]; ok {
+		logging.Logger().Panic(fmt.Sprintf("DI: name[%s] of annotation exist already.", name))
+	}
+
 	meta := getMetaFields(t)
 	fRT, _, _ := cdur.GetTypeInfo(t)
 
diff --git a/registry/registry.go b/registry/registry.go
index 2dbbba7..23ded48 100644
--- a/registry/registry.go
+++ b/registry/registry.go
@@ -2,7 +2,6 @@ package registry
 
 import (
 	"fmt"
-	"log"
 	"reflect"
 	"runtime"
 	"strings"
@@ -50,7 +49,7 @@ func RegisterType(t reflect.Type) {
 	pc, _, _, ok := runtime.Caller(1)
 	details := runtime.FuncForPC(pc)
 	if ok && details != nil {
-		log.Printf("called from %s\n", details.Name())
+		logging.Logger().Debug(fmt.Sprintf("called from %s", details.Name()))
 	}
 
 	registry.RegisterType(t)