遇到这个错误怎么办？Unknown entity:com.wangliang.m?报错

报错如下~

五月 03, 2016 8:11:56 下午 org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {5.1.0.Final}
五月 03, 2016 8:11:56 下午 org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
五月 03, 2016 8:11:56 下午 org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
五月 03, 2016 8:11:56 下午 org.hibernate.boot.jaxb.internal.stax.LocalXmlResourceResolver resolveEntity
WARN: HHH90000012: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/hibernate-configuration. Use namespace http://www.hibernate.org/dtd/hibernate-configuration instead.  Support for obsolete DTD/XSD namespaces may be removed at any time.
五月 03, 2016 8:11:56 下午 org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
五月 03, 2016 8:11:56 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!)
五月 03, 2016 8:11:56 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001005: using driver [com.microsoft.sqlserver.jdbc.SQLServerDriver] at URL [jdbc:sqlserver://localhost:1433;database=java_web]
五月 03, 2016 8:11:56 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001001: Connection properties: {user=sa, password=****}
五月 03, 2016 8:11:56 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001003: Autocommit mode: false
五月 03, 2016 8:11:56 下午 org.hibernate.engine.jdbc.connections.internal.PooledConnections <init>
INFO: HHH000115: Hibernate connection pool size: 20 (min=1)
五月 03, 2016 8:11:57 下午 org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.SQLServerDialect
五月 03, 2016 8:11:57 下午 org.hibernate.envers.boot.internal.EnversServiceImpl configure
INFO: Envers integration enabled? : true
org.hibernate.MappingException: Unknown entity: com.wangliang.model.NXSCmodel
	at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:776)
	at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1533)
	at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:104)
	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:192)
	at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:38)
	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:177)
	at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:32)
	at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:73)
	at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:682)
	at org.hibernate.internal.SessionImpl.save(SessionImpl.java:674)
	at org.hibernate.internal.SessionImpl.save(SessionImpl.java:669)
	at com.wangliang.test.test.insert(test.java:31)
	at com.wangliang.test.test.main(test.java:52)

失败

model类

package com.wangliang.model;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="javaweb")
public class NXSCmodel {
	private int id;
	private String name;
	private String sex;
	private int age;
	@Id
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	
}

<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE hibernate-configuration PUBLIC 
	"-//Hibernate/Hibernate Configuration DTD 3.0//EN" 
	"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
	<session-factory>
		<!--配置数据库的驱动程序 -->
		<property name="connection.driver_class">com.microsoft.sqlserver.jdbc.SQLServerDriver</property>
		<!--设置数据库的连接，其中localhost表示SQLserver服务器名称，此处为本机，1433是SQL的端口号， db_Contact是数据库名 -->
		<property name="connection.url">jdbc:sqlserver://localhost:1433;database=java_web</property>
		<!-- 连接数据库的账号 -->
		<property name="connection.username">sa</property>
		<!-- 连接数据库的密码 -->
		<property name="connection.password">123</property>
		<!--dialect，只是Hibernate使用的数据库方言,就是要用Hibernate连接那种类型的数据库服务器。 -->
		<property name="dialect">org.hibernate.dialect.SQLServerDialect</property>

		<!-- sessionFactory.getCurrentSession()可以完成一系列的工作，当调用时， hibernate将session绑定到当前线程，事务结束后，hibernate 
			将session从当前线程中释放，并且关闭session。当再次调用getCurrentSession ()时，将得到一个新的session，并重新开始这一系列工作。 -->
		<property name="current_session_context_class">thread</property>

		<!-- 配置二级缓存 -->
		<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
		<!-- 运行的时候在控制台输出SQL语句 -->
		<property name="show_sql">true</property>
		<!-- 输出格式化后的sql,更方便查看 -->
		<property name="format_sql">true</property>
		<mapping class="com.wangliang.model.NXSCmodel"/>
	</session-factory>
</hibernate-configuration>

test.java

package com.wangliang.test;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

import com.wangliang.model.NXSCmodel;

public class test {
	public static void insert() {
		SessionFactory factory = null;
		Session session = null;
		try {
			NXSCmodel user = new NXSCmodel();
			user.setName("aaa");
			user.setAge(123456);
			user.setSex("男");
			Configuration cfg = new Configuration().configure();
			ServiceRegistry sr = new StandardServiceRegistryBuilder().applySettings(cfg.getProperties()).build();
			// 读取hibernate.cfg.xml中的配置
			// 获取SessionFactory
			SessionFactory sf = cfg.buildSessionFactory(sr);
			// 获取Session
			session = sf.openSession();
			// 开启事务
			session.beginTransaction();
			// 保存
			session.save(user);
			System.out.print("添加成功");
			// 提交事务
			session.getTransaction().commit();
			// 关闭连接
			session.close();
			sf.close();
		} catch (HibernateException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			System.out.println("失败");
		} finally {
			if (session != null) {
				if (session.isOpen()) {
					session.close();
				}
			}
		}
	}
	public static void main(String[] args) {
		// TODO Auto-generated method stub
			insert();
	}

}