异常处理：java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.reflect.Parameterized

获取父类泛型的class:

 Class<T> entityClass =(Class<T>)((ParameterizedType)getClass().getGenericSuperclass()).getActualTypeArguments()[0];

出现问题：

java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType

解决方法

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

/**
 * my name is kiki ,2016/11/16.
 */
public class GenericsUtils {

    /**通过反射,获得定义Class时声明的父类的范型参数的类型.
     * 如public BookManager extends GenricManager<Book>
     * @param clazz The class to introspect
     * @return the first generic declaration, or <code>Object.class</code> if cannot be determined
     */
    public static Class getSuperClassGenricType(Class clazz) {
        return getSuperClassGenricType(clazz, 0);
    }

    /**通过反射,获得定义Class时声明的父类的范型参数的类型.
     * 如public BookManager extends GenricManager<Book>
     * @param clazz clazz The class to introspect
     * @param index the Index of the generic ddeclaration,start from 0.
     */
    public static Class getSuperClassGenricType(Class clazz, int index) throws IndexOutOfBoundsException {

        Type genType = clazz.getGenericSuperclass();

        if (!(genType instanceof ParameterizedType)) {
            return Object.class;
        }

        Type[] params = ((ParameterizedType) genType).getActualTypeArguments();

        if (index >= params.length || index < 0) {
            return Object.class;
        }
        if (!(params[index] instanceof Class)) {
            return Object.class;
        }
        return (Class) params[index];
    }
}

Class<T> entityClass = GenericsUtils.getSuperClassGenricType(Account.class, 0);