diff --git a/grpc/cmd b/grpc/cmd
index 22a562f..f247b50 100644
--- a/grpc/cmd
+++ b/grpc/cmd
@@ -1 +1,2 @@
-protoc -I grpc/ grpc/grpc.proto --go_out=plugins=grpc:grpc
+protoc -I grpc/ grpc/grpc.proto --go_out=plugins=grpc:build/golang
+protoc -I grpc/ grpc/grpc.proto --java_out=build/java
diff --git a/grpc/grpc.proto b/grpc/grpc.proto
index 9e23461..48e8fbb 100644
--- a/grpc/grpc.proto
+++ b/grpc/grpc.proto
@@ -1,5 +1,7 @@
 syntax = "proto3";
 
+option java_package = "com.loafle.overflow.db.api";
+
 message DBInput {
      string targetDao = 1;
      string method = 2;
@@ -7,7 +9,7 @@ message DBInput {
 }
 
 message DBOutput {
-    map<string, string> result = 1;
+    string result = 1;
 }
 
 service DB {