Replace argument with pre-sized array

src/main/java/org/apache/ibatis/executor/loader/AbstractSerialStateHolder.java

@@ -58,8 +58,8 @@ public AbstractSerialStateHolder(final Object userBean,
     this.userBean = userBean;
     this.unloadedProperties = new HashMap<>(unloadedProperties);
     this.objectFactory = objectFactory;
-    this.constructorArgTypes = constructorArgTypes.toArray(new Class<?>[0]);
-    this.constructorArgs = constructorArgs.toArray(new Object[0]);
+    this.constructorArgTypes = constructorArgTypes.toArray(new Class<?>[constructorArgTypes.size()]);
+    this.constructorArgs = constructorArgs.toArray(new Object[constructorArgs.size()]);
   }
 
   @Override

src/main/java/org/apache/ibatis/plugin/Plugin.java

@@ -96,7 +96,7 @@ private static Class<?>[] getAllInterfaces(Class<?> type, Map<Class<?>, Set<Meth
       }
       type = type.getSuperclass();
     }
-    return interfaces.toArray(new Class<?>[0]);
+    return interfaces.toArray(new Class<?>[interfaces.size()]);
   }
 
 }

src/main/java/org/apache/ibatis/reflection/ParamNameResolver.java

@@ -104,7 +104,7 @@ private static boolean isSpecialParameter(Class<?> clazz) {
    * @return the names
    */
   public String[] getNames() {
-    return names.values().toArray(new String[0]);
+    return names.values().toArray(new String[names.size()]);
   }
 
   /**

src/main/java/org/apache/ibatis/reflection/Reflector.java

@@ -76,8 +76,8 @@ public Reflector(Class<?> clazz) {
       addSetMethods(classMethods);
       addFields(clazz);
     }
-    readablePropertyNames = getMethods.keySet().toArray(new String[0]);
-    writablePropertyNames = setMethods.keySet().toArray(new String[0]);
+    readablePropertyNames = getMethods.keySet().toArray(new String[getMethods.size()]);
+    writablePropertyNames = setMethods.keySet().toArray(new String[setMethods.size()]);
     for (String propName : readablePropertyNames) {
       caseInsensitivePropertyMap.put(propName.toUpperCase(Locale.ENGLISH), propName);
     }
@@ -303,7 +303,7 @@ private Method[] getClassMethods(Class<?> clazz) {
 
     Collection<Method> methods = uniqueMethods.values();
 
-    return methods.toArray(new Method[0]);
+    return methods.toArray(new Method[methods.size()]);
   }
 
   private void addUniqueMethods(Map<String, Method> uniqueMethods, Method[] methods) {

src/main/java/org/apache/ibatis/reflection/factory/DefaultObjectFactory.java

@@ -68,13 +68,13 @@ private <T> T instantiateClass(Class<T> type, List<Class<?>> constructorArgTypes
           throw e;
         }
       }
-      constructor = type.getDeclaredConstructor(constructorArgTypes.toArray(new Class[0]));
+      constructor = type.getDeclaredConstructor(constructorArgTypes.toArray(new Class[constructorArgTypes.size()]));
       try {
-        return constructor.newInstance(constructorArgs.toArray(new Object[0]));
+        return constructor.newInstance(constructorArgs.toArray(new Object[constructorArgs.size()]));
       } catch (IllegalAccessException e) {
         if (Reflector.canControlMemberAccessible()) {
           constructor.setAccessible(true);
-          return constructor.newInstance(constructorArgs.toArray(new Object[0]));
+          return constructor.newInstance(constructorArgs.toArray(new Object[constructorArgs.size()]));
         }
         throw e;
       }