报错信息：
org.hibernate.hql.internal.ast.QuerySyntaxException: User is not mapped [from User]
	at org.hibernate.hql.internal.ast.QuerySyntaxException.generateQueryException(QuerySyntaxException.java:96)
	at org.hibernate.QueryException.wrapWithQueryString(QueryException.java:120)
	at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:234)
	at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:158)
	at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:126)
	at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:88)
	at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:190)
	at org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:301)
	at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:236)
	at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1800)
	at org.crazyit.app.daoimpl.UserDaoImpl.findAll(UserDaoImpl.java:30)
	at org.crazyit.app.daoimpl.UserDaoImpl.testMethod(UserDaoImpl.java:81)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:73)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:46)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:180)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:41)
	at org.junit.runners.ParentRunner$1.evaluate(ParentRunner.java:173)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:220)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: User is not mapped
	at org.hibernate.hql.internal.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:189)
	at org.hibernate.hql.internal.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:109)
	at org.hibernate.hql.internal.ast.tree.FromClause.addFromElement(FromClause.java:95)
	at org.hibernate.hql.internal.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:331)
	at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3633)
	at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3522)
	at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:706)
	at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:562)
	at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:299)
	at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:247)
	at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:278)
	at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:206)
	... 33 more

hibernate.cfg.xml文件：
< xml version="1.0" encoding="UTF-8" >
<!DOCTYPE hibernate-configuration PUBLIC
	"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
	"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
	<session-factory>
		<!-- 指定连接数据库所用的驱动 -->
		<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
		<!-- 指定连接数据库的url，其中hibernate是本应用连接的数据库名 -->
		<property name="connection.url">jdbc:mysql://localhost/hibernate useUnicode=true&amp;characterEncoding=utf8</property>
		<!-- 指定连接数据库的用户名 -->
		<property name="connection.username">root</property>
		<!-- 指定连接数据库的密码 -->
		<property name="connection.password">admin</property>
		<!-- 指定连接池里最大连接数 -->
		<property name="hibernate.c3p0.max_size">20</property>
		<!-- 指定连接池里最小连接数 -->
		<property name="hibernate.c3p0.min_size">1</property>
		<!-- 指定连接池里连接的超时时长 -->
		<property name="hibernate.c3p0.timeout">5000</property>
		<!-- 指定连接池里最大缓存多少个Statement对象 -->
		<property name="hibernate.c3p0.max_statements">100</property>
		<property name="hibernate.c3p0.idle_test_period">3000</property>
		<property name="hibernate.c3p0.acquire_increment">2</property>
		<property name="hibernate.c3p0.validate">true</property>
		<!-- 指定数据库方言 -->
		<property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
		<!-- 根据需要自动创建数据表(update:当实体类发生改变时，重新建表)
		<property name="hbm2ddl.auto">update</property> -->
		<!-- 显示Hibernate持久化操作所生成的SQL -->
		<property name="show_sql">true</property>
		<!-- 将SQL脚本进行格式化后再输出 -->
		<property name="hibernate.format_sql">true</property>
		<!-- 罗列所有持久化类的类名 -->
		<mapping class="org.crazyit.app.entity.News"/>
		<mapping class="org.crazyit.app.entity.User"/>
	</session-factory>
</hibernate-configuration>

User实体类：
/**
 * @author borners
 *
 *	映射用户实体类
 */
@Entity(name="user_inf")
public class User implements Serializable{

	private static final long serialVersionUID = 100001L;

	@Id
	@GeneratedValue(strategy=GenerationType.AUTO)
	@Column(name="id")
	private Integer id;

	@Column(name="USERNAME")
	private String username;

	@Column(name="PASSWORD")
	private String password;

	@Column(name="BIRTHDAY")
	private Date birthday;

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public Date getBirthday() {
		return birthday;
	}

	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}
}

查询方法：
public List<User> findAll() {
		try{
			Session session = HSessionUtil.getSession();
			List<User> list = session.createQuery("from User").list();//报错
			for(User user : list){
				System.out.println(user);
			}
		}catch (Exception e) {
			e.printStackTrace();
		}finally{
			HSessionUtil.closeSession();
		}
		return null;
	}