diff --git a/src/main/java/com/loafle/overflow/proxy/ServiceInvoker.java b/src/main/java/com/loafle/overflow/proxy/ServiceInvoker.java
index 8446f3d..2f248ea 100644
--- a/src/main/java/com/loafle/overflow/proxy/ServiceInvoker.java
+++ b/src/main/java/com/loafle/overflow/proxy/ServiceInvoker.java
@@ -1,6 +1,6 @@
 package com.loafle.overflow.proxy;
 
-import com.google.common.primitives.Primitives;
+import com.google.gson.internal.Primitives;
 import com.google.protobuf.ByteString;
 import org.codehaus.jackson.map.DeserializationConfig;
 import org.codehaus.jackson.map.ObjectMapper;
@@ -10,6 +10,7 @@ import org.springframework.stereotype.Component;
 
 import java.io.IOException;
 import java.lang.reflect.*;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -26,6 +27,23 @@ public class ServiceInvoker {
 
     private Map<String, Cache> serviceCacheMap;
 
+    private static final Map<String, Class> primitiveMap;
+
+    static {
+        Map<String, Class> primitives = new HashMap<>(8);
+
+        primitives.put("boolean", boolean.class);
+        primitives.put("byte", byte.class);
+        primitives.put("char", char.class);
+        primitives.put("double", double.class);
+        primitives.put("float", float.class);
+        primitives.put("int", int.class);
+        primitives.put("long", long.class);
+        primitives.put("short", short.class);
+
+        primitiveMap = Collections.unmodifiableMap(primitives);
+    }
+
     public ServiceInvoker(ApplicationContext context) {
         this.context = context;
         objectMapper = new ObjectMapper();
@@ -97,9 +115,8 @@ public class ServiceInvoker {
                         }
                     }
                 } else {
-
-                    if (Primitives.allPrimitiveTypes().contains(parameterType.getTypeName())) {
-
+                    if (Primitives.isPrimitive(parameterType)) {
+                        parameterCache.clazz = primitiveMap.get(parameterType.getTypeName());
                     } else {
                         parameterCache.clazz = Class.forName(parameterType.getTypeName());
                     }
diff --git a/src/main/java/com/loafle/overflow/proxy/ServiceProxy.java b/src/main/java/com/loafle/overflow/proxy/ServiceProxy.java
index 0688954..6c14e4a 100644
--- a/src/main/java/com/loafle/overflow/proxy/ServiceProxy.java
+++ b/src/main/java/com/loafle/overflow/proxy/ServiceProxy.java
@@ -88,6 +88,9 @@ public class ServiceProxy {
             } catch (IllegalAccessException e) {
                 e.printStackTrace();
                 responseObserver.onError(e);
+            } catch (InstantiationException e) {
+                e.printStackTrace();
+                responseObserver.onError(e);
             }