SPRING接收前台传入List时，超过256报IndexOutOfBoundsException异常

首先看看异常

org.springframework.beans.InvalidPropertyException: Invalid property 'detail[256]' of bean class [com.suning.asvp.mer.entity.InviteCooperationInfo]: Index of out of bounds in property path 'detail[256]'; nested exception is java.lang.IndexOutOfBoundsException: Index: 256, Size: 256
at org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:833) ~[spring-beans-3.1.2.RELEASE.jar:3.1.2.RELEASE]
at org.springframework.beans.BeanWrapperImpl.getNestedBeanWrapper(BeanWrapperImpl.java:576) ~[spring-beans-3.1.2.RELEASE.jar:3.1.2.RELEASE]
at org.springframework.beans.BeanWrapperImpl.getBeanWrapperForPropertyPath(BeanWrapperImpl.java:553) ~[spring-beans-3.1.2.RELEASE.jar:3.1.2.RELEASE]
at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:914) ~[spring-beans-3.1.2.RELEASE.jar:3.1.2.RELEASE]
at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:76) ~[spring-beans-3.1.2.RELEASE.jar:3.1.2.RELEASE]
at org.springframework.validation.DataBinder.applyPropertyValues(DataBinder.java:692) ~[spring-context-3.1.2.RELEASE.jar:3.1.2.RELEASE]
at org.springframework.validation.DataBinder.doBind(DataBinder.java:588) ~[spring-context-3.1.2.RELEASE.jar:3.1.2.RELEASE]
at org.springframework.web.bind.WebDataBinder.doBind(WebDataBinder.java:191) ~[spring-web-3.1.2.RELEASE.jar:3.1.2.RELEASE]
at org.springframework.web.bind.ServletRequestDataBinder.bind(ServletRequestDataBinder.java:112) ~[spring-web-3.1.2.RELEASE.jar:3.1.2.RELEASE]

从前台传入detailList256个时不会报错，接收第257个时就会出现异常。。

然后看一下报异常的源代码，类名BeanWrapperImpl

else if (value instanceof List) {
int index = Integer.parseInt(key);
List list = (List) value;
growCollectionIfNecessary(list, index, indexedPropertyName, pd, i + 1);
value = list.get(index);// 测试报错时，此处list只有256个，index为256时，取第257个报错
}

    @SuppressWarnings("unchecked")
    private void growCollectionIfNecessary(
            Collection collection, int index, String name, PropertyDescriptor pd, int nestingLevel) {

        if (!this.autoGrowNestedPaths) {
            return;
        }
        int size = collection.size();
        // 当个数小于autoGrowCollectionLimit这个值时才会向list中添加新元素
        if (index >= size && index < this.autoGrowCollectionLimit) {
            Class elementType = GenericCollectionTypeResolver.getCollectionReturnType(pd.getReadMethod(), nestingLevel);
            if (elementType != null) {
                for (int i = collection.size(); i < index + 1; i++) {
                    collection.add(newValue(elementType, name));
                }
            }
        }
    }

根据上面的分析找到autoGrowCollectionLimit的定义

public class DataBinder implements PropertyEditorRegistry, TypeConverter {

/** Default object name used for binding: "target" */
public static final String DEFAULT_OBJECT_NAME = "target";

/** Default limit for array and collection growing: 256 */
public static final int DEFAULT_AUTO_GROW_COLLECTION_LIMIT = 256;

private int autoGrowCollectionLimit = DEFAULT_AUTO_GROW_COLLECTION_LIMIT;

解决方案，是在自己的Controller中加入如下方法

    @InitBinder
    protected void initBinder(WebDataBinder binder) {
        binder.setAutoGrowNestedPaths(true);
        binder.setAutoGrowCollectionLimit(1024);
    }

以上。