fixed compiler warnnings

src/main/java/com/alibaba/fastjson/parser/deserializer/JavaBeanDeserializer.java

@@ -1,7 +1,6 @@
 package com.alibaba.fastjson.parser.deserializer;
 
 import java.lang.reflect.Constructor;
-import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.lang.reflect.Proxy;
 import java.lang.reflect.Type;

src/main/java/com/alibaba/fastjson/serializer/MapSerializer.java

@@ -17,11 +17,8 @@ package com.alibaba.fastjson.serializer;
 
 import java.io.IOException;
 import java.lang.reflect.Type;
-import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.SortedMap;
-import java.util.TreeMap;
 
 import com.alibaba.fastjson.JSON;
 
@@ -32,7 +29,7 @@ public class MapSerializer implements ObjectSerializer {
 
     public static MapSerializer instance = new MapSerializer();
 
-    @SuppressWarnings({ "rawtypes", "unchecked" })
+    @SuppressWarnings({ "rawtypes"})
     public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features) throws IOException {
         SerializeWriter out = serializer.getWriter();