【Spring】java.lang.IndexOutOfBoundsException: Index: 256, Size: 256

Spring接受前臺的數據超過256出現如下異常：

org.springframework.beans.InvalidPropertyException: Invalid property 'specificationValues[256]' of bean class [com.sencloud.entity.Specification]: Index of out of bounds in property path 'specificationValues[256]'; nested exception is java.lang.IndexOutOfBoundsException: Index: 256, Size: 256
	org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:811)
	org.springframework.beans.BeanWrapperImpl.getNestedBeanWrapper(BeanWrapperImpl.java:554)

溯源了下Spring的代碼，找到了DataBinder，先解釋下DataBinder類的作用，見鏈接

http://docs.spring.io/spring/docs/1.2.x/api/org/springframework/validation/DataBinder.html

其中有一句

Binder that allows for binding property values to a target object. The binding process can be customized through specifying allowed fields, required fields, and custom editors.

Note that there are potential security implications in failing to set an array of allowed fields. In the case of HTTP form POST data for example, malicious clients can attempt to subvert an application by supplying values for fields or properties that do not exist on the form. In some cases this could lead to illegal data being set on command objects or their nested objects. For this reason, it is highly recommended to specify the allowedFields property on the DataBinder.

大概意思是前臺的Form 元素綁定到 後臺的JaveBean對象，做的一個映射，但是這個映射的List長度不可以超過256

反編譯的源碼如下：

解決如下：重set下autoGrowCollectionLimit，當做綁定的時候set爲1024或者更大

  /**
     * 由於Spring在接受前臺傳入的List時，就會出現256的IndexOutOfBoundsException異常
     * 設置setAutoGrowCollectionLimit爲1024
     * @param binder
     * @see [類、類#方法、類#成員]
     */
    @InitBinder
    public void initListBinder(WebDataBinder binder)
    {
        // 設置需要包裹的元素個數，默認爲256
        binder.setAutoGrowCollectionLimit(1024);
    }