diff --git a/_lab/go/go.mod b/_lab/go/go.mod
index 14c6e694..e54d1dda 100644
--- a/_lab/go/go.mod
+++ b/_lab/go/go.mod
@@ -1,6 +1,6 @@
 module github.com/tableauio/loader/_lab/go
 
-go 1.17
+go 1.18
 
 require (
 	github.com/pkg/errors v0.9.1
diff --git a/_lab/go/loader_test.go b/_lab/go/loader_test.go
index f705ab74..12d1ea6b 100644
--- a/_lab/go/loader_test.go
+++ b/_lab/go/loader_test.go
@@ -3,16 +3,17 @@ package main
 import (
 	"testing"
 
-	"github.com/tableauio/tableau/options"
+	"github.com/tableauio/loader/_lab/go/tableau"
+	"github.com/tableauio/tableau/format"
 )
 
 func Test_Loader(t *testing.T) {
-	err := GetHub().Load("../../testdata/", nil, options.JSON)
+	err := GetHub().Load("../../testdata/", nil, format.JSON)
 	if err != nil {
 		panic(err)
 	}
 
-	conf := GetHub().GetActivityConf()
+	conf := Get[*tableau.ActivityConf]()
 	if conf == nil {
 		panic("ActivityConf is nil")
 	}
@@ -21,4 +22,4 @@ func Test_Loader(t *testing.T) {
 		panic(err)
 	}
 	t.Logf("ActivityConf: %v", chapter)
-}
\ No newline at end of file
+}
diff --git a/_lab/go/main.go b/_lab/go/main.go
index 34687f58..1ee7c66f 100644
--- a/_lab/go/main.go
+++ b/_lab/go/main.go
@@ -28,13 +28,17 @@ func GetHub() *MyHub {
 	return hubSingleton
 }
 
+func Get[T tableau.Messager]() T {
+	return tableau.Get[T](GetHub().Hub)
+}
+
 func main() {
 	err := GetHub().Load("../../test/testdata/", nil, format.JSON, load.IgnoreUnknownFields(true))
 	if err != nil {
 		panic(err)
 	}
 
-	conf := GetHub().GetActivityConf()
+	conf := Get[*tableau.ActivityConf]()
 	if conf == nil {
 		panic("ActivityConf is nil")
 	}
@@ -59,7 +63,7 @@ func main() {
 }
 
 func debug() {
-	itemConf := GetHub().GetItemConf()
+	itemConf := Get[*tableau.ItemConf]() 
 	if itemConf == nil {
 		panic("ItemConf is nil")
 	}
diff --git a/_lab/go/tableau/hub.pc.go b/_lab/go/tableau/hub.pc.go
index b462c316..0458731f 100644
--- a/_lab/go/tableau/hub.pc.go
+++ b/_lab/go/tableau/hub.pc.go
@@ -87,24 +87,17 @@ func (h *Hub) Load(dir string, filter Filter, format format.Format, options ...l
 	return nil
 }
 
-// Auto-generated getters below
-
-func (h *Hub) GetActivityConf() *ActivityConf {
-	msger := h.messagerMap["ActivityConf"]
-	if msger != nil {
-		if conf, ok := msger.(*ActivityConf); ok {
-			return conf
-		}
+func Get[T Messager](h *Hub) T {
+	var t T
+	if h == nil {
+		return t
 	}
-	return nil
-}
-
-func (h *Hub) GetItemConf() *ItemConf {
-	msger := h.messagerMap["ItemConf"]
+	msgers := h.messagerMap
+	msger := msgers[t.Name()]
 	if msger != nil {
-		if conf, ok := msger.(*ItemConf); ok {
-			return conf
+		if t, ok := msger.(T); ok {
+			return t
 		}
 	}
-	return nil
+	return t
 }
diff --git a/_lab/go/tableau/item_conf.pc.go b/_lab/go/tableau/item_conf.pc.go
index 67893595..21eec2df 100644
--- a/_lab/go/tableau/item_conf.pc.go
+++ b/_lab/go/tableau/item_conf.pc.go
@@ -9,15 +9,18 @@ import (
 )
 
 type ItemConf struct {
-	data protoconf.ItemConf
+	data *protoconf.ItemConf
 }
 
 func (x *ItemConf) Name() string {
-	return string((&x.data).ProtoReflect().Descriptor().Name())
+	return string(x.Data().ProtoReflect().Descriptor().Name())
 }
 
 func (x *ItemConf) Data() *protoconf.ItemConf {
-	return &x.data
+	if x == nil {
+		return nil
+	}
+	return x.data
 }
 
 // Messager is used to implement Checker interface.
@@ -31,11 +34,11 @@ func (x *ItemConf) Check(hub *Hub) error {
 }
 
 func (x *ItemConf) Load(dir string, format format.Format, options ...load.Option) error {
-	return load.Load(&x.data, dir, format, options...)
+	return load.Load(x.data, dir, format, options...)
 }
 
 func (x *ItemConf) Get1(key1 uint32) (*protoconf.ItemConf_Item, error) {
-	d := x.data.ItemMap
+	d := x.Data().GetItemMap()
 	if d == nil {
 		return nil, xerrors.Errorf(code.Nil, "ItemMap is nil")
 	}
@@ -48,6 +51,6 @@ func (x *ItemConf) Get1(key1 uint32) (*protoconf.ItemConf_Item, error) {
 
 func init() {
 	register("ItemConf", func() Messager {
-		return &ItemConf{}
+		return &ItemConf{data: &protoconf.ItemConf{}}
 	})
 }
diff --git a/_lab/go/tableau/test.pc.go b/_lab/go/tableau/test.pc.go
index f40353bb..768bbeb0 100644
--- a/_lab/go/tableau/test.pc.go
+++ b/_lab/go/tableau/test.pc.go
@@ -11,15 +11,18 @@ import (
 )
 
 type ActivityConf struct {
-	data protoconf.ActivityConf
+	data *protoconf.ActivityConf
 }
 
 func (x *ActivityConf) Name() string {
-	return string((&x.data).ProtoReflect().Descriptor().Name())
+	return string(x.Data().ProtoReflect().Descriptor().Name())
 }
 
 func (x *ActivityConf) Data() *protoconf.ActivityConf {
-	return &x.data
+	if x == nil {
+		return nil
+	}
+	return x.data
 }
 
 // Messager is used to implement Checker interface.
@@ -29,13 +32,13 @@ func (x *ActivityConf) Messager() Messager {
 
 // Check is used to implement Checker interface.
 func (x *ActivityConf) Check(hub *Hub) error {
-	conf := hub.GetItemConf()
+	conf := Get[*ItemConf](hub)
 	if conf == nil {
 		return fmt.Errorf("ItemConf is nil")
 	}
 	for _, val1 := range x.data.ActivityMap {
 		for key2 := range val1.ChapterMap {
-			if _, ok := conf.Data().ItemMap[key2]; !ok {
+			if _, ok := conf.Data().GetItemMap()[key2]; !ok {
 				return fmt.Errorf("refer: %v not found in ItemConf.ID", key2)
 			}
 		}
@@ -44,7 +47,7 @@ func (x *ActivityConf) Check(hub *Hub) error {
 }
 
 func (x *ActivityConf) Load(dir string, fmt format.Format, options ...load.Option) error {
-	return load.Load(&x.data, dir, fmt, options...)
+	return load.Load(x.data, dir, fmt, options...)
 }
 
 func (x *ActivityConf) Get1(key1 uint64) (*protoconf.ActivityConf_Activity, error) {
@@ -112,6 +115,6 @@ func (x *ActivityConf) Get4(key1 uint64, key2 uint32, key3 uint32, key4 uint32)
 
 func init() {
 	register("ActivityConf", func() Messager {
-		return &ActivityConf{}
+		return &ActivityConf{data: &protoconf.ActivityConf{}}
 	})
 }
diff --git a/cmd/protoc-gen-go-tableau-loader/hub.go b/cmd/protoc-gen-go-tableau-loader/hub.go
index 896dd157..1d0b9a2a 100644
--- a/cmd/protoc-gen-go-tableau-loader/hub.go
+++ b/cmd/protoc-gen-go-tableau-loader/hub.go
@@ -16,19 +16,6 @@ func generateHub(gen *protogen.Plugin) {
 	g.P()
 	g.P(staticHubContent)
 	g.P()
-
-	for _, messager := range messagers {
-		g.P("func (h *Hub) Get", messager, "() *", messager, " {")
-		g.P(`msger := h.messagerMap["`, messager, `"]`)
-		g.P("if msger != nil {")
-		g.P("if conf, ok := msger.(*", messager, "); ok {")
-		g.P("return conf")
-		g.P("}")
-		g.P("}")
-		g.P("return nil")
-		g.P("}")
-		g.P()
-	}
 }
 
 const staticHubContent = `import (
@@ -118,4 +105,19 @@ func (h *Hub) Load(dir string, filter Filter, format format.Format, options ...l
 	return nil
 }
 
-// Auto-generated getters below`
+func Get[T Messager](h *Hub) T {
+	var t T
+	if h == nil {
+		return t
+	}
+	msgers := h.messagerMap
+	msger := msgers[t.Name()]
+	if msger != nil {
+		if t, ok := msger.(T); ok {
+			return t
+		}
+	}
+	return t
+}
+
+`
diff --git a/cmd/protoc-gen-go-tableau-loader/messager.go b/cmd/protoc-gen-go-tableau-loader/messager.go
index 03d15912..23bef3b2 100644
--- a/cmd/protoc-gen-go-tableau-loader/messager.go
+++ b/cmd/protoc-gen-go-tableau-loader/messager.go
@@ -55,15 +55,15 @@ func generateFileContent(gen *protogen.Plugin, file *protogen.File, g *protogen.
 		}
 	}
 	messagers = append(messagers, fileMessagers...)
-	generateRegister(fileMessagers, g)
+	generateRegister(fileMessagers, g, file)
 }
 
-func generateRegister(messagers []string, g *protogen.GeneratedFile) {
+func generateRegister(messagers []string, g *protogen.GeneratedFile, file *protogen.File) {
 	// register messagers
 	g.P("func init() {")
 	for _, messager := range messagers {
 		g.P(`register("`, messager, `", func() Messager {`)
-		g.P("return &", messager, "{}")
+		g.P("return &", messager, "{data: &", file.GoImportPath.Ident(messager), "{}}")
 		g.P("})")
 	}
 	g.P("}")
@@ -75,18 +75,21 @@ func genMessage(gen *protogen.Plugin, file *protogen.File, g *protogen.Generated
 
 	// messager definition
 	g.P("type ", messagerName, " struct {")
-	g.P("data ", file.GoImportPath.Ident(messagerName))
+	g.P("data *", file.GoImportPath.Ident(messagerName))
 	g.P("}")
 	g.P()
 
 	// messager methods
 	g.P("func (x *", messagerName, ") Name() string {")
-	g.P("return string((&x.data).ProtoReflect().Descriptor().Name())")
+	g.P("return string(x.Data().ProtoReflect().Descriptor().Name())")
 	g.P("}")
 	g.P()
 
 	g.P("func (x *", messagerName, ") Data() *", file.GoImportPath.Ident(messagerName), " {")
-	g.P("return &x.data")
+	g.P("if x == nil {")
+	g.P("return nil")
+	g.P("}")
+	g.P("return x.data")
 	g.P("}")
 	g.P()
 
@@ -109,7 +112,7 @@ func genMessage(gen *protogen.Plugin, file *protogen.File, g *protogen.Generated
 	g.P()
 
 	g.P("func (x *", messagerName, ") Load(dir string, format ", formatPackage.Ident("Format"), " , options ...", loadPackage.Ident("Option"), ") error {")
-	g.P("return ", loadPackage.Ident("Load"), "(&x.data, dir, format, options...)")
+	g.P("return ", loadPackage.Ident("Load"), "(x.data, dir, format, options...)")
 	g.P("}")
 	g.P()
 
@@ -173,7 +176,7 @@ func genMapGetters(depth int, params []string, messagerName string, file *protog
 
 			var container string
 			if depth == 1 {
-				container = "x.data"
+				container = "x.Data()"
 			} else {
 				container = "conf"
 				var findParams []string
@@ -188,7 +191,7 @@ func genMapGetters(depth int, params []string, messagerName string, file *protog
 				g.P()
 			}
 
-			g.P("d := ", container, ".", field.GoName)
+			g.P("d := ", container, ".Get", field.GoName, "()")
 			g.P("if d == nil {")
 			g.P(`return `, returnEmptyValue, `, `, errorsPackage.Ident("Errorf"), `(`, codePackage.Ident("Nil"), `, "`, field.GoName, ` is nil")`)
 			g.P("}")
diff --git a/go.mod b/go.mod
index 682c9afd..c8136b74 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/tableauio/loader
 
-go 1.17
+go 1.18
 
 require (
 	github.com/iancoleman/strcase v0.2.0