bug fixed for getOnly toJavaObject

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

@@ -815,17 +815,11 @@ public Object createInstance(Map<String, Object> map, ParserConfig config) //
                     continue;
                 }
 
-                Method method = fieldDeser.fieldInfo.method;
-                if (method != null) {
-                    Type paramType = method.getGenericParameterTypes()[0];
-                    value = TypeUtils.cast(value, paramType, config);
-                    method.invoke(object, new Object[] { value });
-                } else {
-                    Field field = fieldDeser.fieldInfo.field;
-                    Type paramType = fieldDeser.fieldInfo.fieldType;
-                    value = TypeUtils.cast(value, paramType, config);
-                    field.set(object, value);
-                }
+                final FieldInfo fieldInfo = fieldDeser.fieldInfo;
+                Type paramType = fieldInfo.fieldType;
+                value = TypeUtils.cast(value, paramType, config);
+
+                fieldDeser.setValue(object, value);
             }
 
             if (beanInfo.buildMethod != null) {

src/test/java/com/alibaba/json/bvt/bug/Issue_for_oschina_3087749_2215732.java

@@ -0,0 +1,27 @@
+package com.alibaba.json.bvt.bug;
+
+import com.alibaba.fastjson.JSON;
+import com.alibaba.fastjson.JSONObject;
+import junit.framework.Test;
+import junit.framework.TestCase;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Created by wenshao on 29/12/2016.
+ */
+public class Issue_for_oschina_3087749_2215732 extends TestCase {
+    public void test_for_issue() throws Exception {
+        String json = "{\"datas\":[\"a\",\"b\"]}";
+        JSONObject o = JSON.parseObject(json);
+        o.toJavaObject(JsonBean.class);
+    }
+
+    public static class JsonBean {
+        private List<String> datas = new ArrayList<String>();
+        public List<String> getDatas() {
+            return datas;
+        }
+    }
+}