休眠：object.org.hibernate.MappingException
Posted
技术标签:
【中文标题】休眠：object.org.hibernate.MappingException【英文标题】：Hibernate : object.org.hibernate.MappingException 【发布时间】：2017-09-19 00:54:19 【问题描述】：这是我面临的异常......每当我尝试将我的对象保存在数据库中时都会发生......即在 session.save 上
Failed to create sessionFactory object.org.hibernate.MappingException: Unknown entity: com.java.learn.pojo.Employee
Apr 22, 2017 3:16:01 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop
INFO: HHH10001008: Cleaning up connection pool [jdbc:mysql://localhost/test]
Apr 22, 2017 3:16:01 AM org.hibernate.engine.jdbc.connections.internal.PooledConnections close
ERROR: Collection leak detected: there are 1 unclosed connections upon shutting down pool jdbc:mysql://localhost/test
Apr 22, 2017 3:16:34 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [Learn] in context with path [/Practice] threw exception [Handler processing failed; nested exception is java.lang.ExceptionInInitializerError] with root cause
org.hibernate.MappingException: Unknown entity: com.java.learn.pojo.Employee
at org.hibernate.metamodel.internal.MetamodelImpl.entityPersister(MetamodelImpl.java:620)
at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1634)
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:689)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:681)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:676)
at com.java.learn.dao.DaoClass.callDatabase(DaoClass.java:29)
at com.java.learn.service.ServiceClass.callDao(ServiceClass.java:17)
at com.java.learn.controller.ControllerClass.personController(ControllerClass.java:26)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:776)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
这是我用来保存对象的 java 代码
try
Configuration configuration = new Configuration().configure();
StandardServiceRegistryBuilder builder =
new StandardServiceRegistryBuilder().applySettings(configuration.getProperties());
factory = configuration.buildSessionFactory(builder.build());
Session session = factory.openSession();
Transaction t = session.beginTransaction();
Employee e = new Employee(1, "", "", 3);
e.setFirstName("sparsh");
session.save(e);
t.commit();
System.out.println("in dao");
catch (Throwable ex)
System.err.println("Failed to create sessionFactory object." + ex);
factory.close();
throw new ExceptionInInitializerError(ex);
这是我在项目中包含的 jar 文件
这是cfg文件
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="hibernate.connection.driver_class">
com.mysql.jdbc.Driver
</property>
<!-- Assume students is the database name -->
<property name="hibernate.connection.url">
jdbc:mysql://localhost/test
</property>
<property name="hibernate.connection.username">
root
</property>
<property name="hibernate.connection.password">
root1
</property>
<property name="hbm2ddl.auto">create</property>
<property name="show_sql">true</property>
<mapping class="com.java.learn.pojo.Employee"/>
</session-factory>
</hibernate-configuration>
Employee.java
package com.java.learn.pojo;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
@Table
@Entity
public class Employee
@Id
@GeneratedValue
@Column(name = "id")
private int id;
@Column(name = "first_name")
private String firstName;
@Column(name = "last_name")
private String lastName;
@Column(name = "salary")
private int salary;
public Employee()
public Employee(int id, String firstName, String lastName, int salary)
super();
this.id = id;
this.firstName = firstName;
this.lastName = lastName;
this.salary = salary;
public int getId()
return id;
public void setId(int id)
this.id = id;
public String getFirstName()
return firstName;
public void setFirstName(String first_name)
this.firstName = first_name;
public String getLastName()
return lastName;
public void setLastName(String last_name)
this.lastName = last_name;
public int getSalary()
return salary;
public void setSalary(int salary)
this.salary = salary;
请帮忙
【问题讨论】：
向我们展示员工 POJO？ 添加了Employee.java 如果我们不给它，它就会把它作为类的名字......对吗？ @yogidilip 不认为表名应该有任何区别，因为 hibernate 应该能够使用其命名策略推断名称，因为 name = "EMPLOYEE" 是可选的。 属性name = "EMPLOYEE"在`表映射中是可选的。
【参考方案1】：
这是 Hibernate 5 的一个问题——你不能使用 Hibernate 4 的方法进行配置。此代码不正确：
Configuration configuration = new Configuration().configure();
StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties());
factory = configuration.buildSessionFactory(builder.build());
请检查一下 https://***.com/a/32711654/3405171
【讨论】：
进行了更改...现在面临的原因是：com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException：您的 SQL 语法有错误；检查与您的 MySQL 服务器版本相对应的手册，以在第 1 行的“type=MyISAM”附近使用正确的语法 @sparsh610 如果您使用的是@GeneratedValue，则不应设置id。
@v.ladynev 我最近从 4 迁移到了 Hibernate 5，但没有遇到这样的问题。感谢您的出色库 github.com/v-ladynev/fluent-hibernate
@Sneh 不客气 :)。感谢您玩图书馆。可能，您使用了其他配置方法。
我删除了 id ，但仍然面临同样的问题，当我打印休眠查询时，我发现创建表 EMPLOYEE（id 整数不为空 auto_increment，first_name varchar（255），last_name varchar（255），工资整数，主键 (id)) type=MyISAM .... type isam .. 不知道它来自哪里以上是关于休眠：object.org.hibernate.MappingException的主要内容，如果未能解决你的问题，请参考以下文章