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

Spring接受前台的數據超過256出現例如以下異常：

 

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

當中有一句

 

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.

大概意思是前台的Form 元素綁定到 后台的JaveBean對象，做的一個映射。可是這個映射的List長度不能夠超過256

反編譯的源代碼例如以下：

 

 

解決例如以下：重set下autoGrowCollectionLimit，當做綁定的時候set為1024或者更大

 　　　　 

 　　 /**
     * 因為Spring在接受前台傳入的List時，就會出現256的IndexOutOfBoundsException異常
     * 設置setAutoGrowCollectionLimit為1024
     * @param binder
     * @see [類、類#方法、類#成員]
     */
    @InitBinder
    public void initListBinder(WebDataBinder binder)
    {
        // 設置須要包裹的元素個數，默覺得256
        binder.setAutoGrowCollectionLimit(1024);
　　 }