org.hibernate.MappingException:未知实体

问题描述 投票:22回答:10

我试图通过初休眠第二版的工作,和我被困试图把连同HSQLDB简单的工作示例。

当我运行ant populateMessages,我得到

[java] org.hibernate.MappingException: Unknown entity: sample.entity.Message
[java]     at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:194)
[java]     at org.apache.tools.ant.taskdefs.Java.run(Java.java:747)
...

下面是我得到了什么:

message.Java

package sample.entity;

import org.hibernate.annotations.Entity;

import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
public class Message
{
    private String messageText;
    private Integer id;

    public Message( String messageText )
    {
        this.messageText = messageText;
    }

    public Message()
    {
    }

    public String getMessageText()
    {
        return messageText;
    }

    public void setMessageText(String messageText)
    {
        this.messageText = messageText;
    }

    @Id
    @GeneratedValue
    public Integer getId()
    {
        return id;
    }

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

populate messages.Java

package sample;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;
import sample.entity.Message;

import java.util.Date;

public class PopulateMessages
{
    public static void main(String[] args)
    {
        SessionFactory factory = new AnnotationConfiguration().configure().buildSessionFactory();
        Session session = factory.openSession();
        session.beginTransaction();

        Message m1 = new Message("Hibernated a  messages on " + new Date());
        session.save(m1);
        session.getTransaction().commit();
        session.close();
    }
}

build.properties

# Path to the hibernate install directory
hibernate.home=C:/hibernate/hibernate-3.5.6
# Path to the hibernate-tools install directory
hibernate.tools.home=C:/hibernate/hibernate-tools
# Path to hibernate-tools.jar relative to hibernate.tools.home
hibernate.tools.path=/plugins/org.hibernate.eclipse_3.3.1.v201006011046R-H111-GA/lib/tools
# Path to hibernate-tools hibernate libraries relative to hibernate.tools.home
hibernate.tools.lib.path=/plugins/org.hibernate.eclipse_3.3.1.v201006011046R-H111-GA/lib/hibernate
# Path to the SLF4J implementation JAR for the logging framework to use
slf4j.implementation.jar=lib/slf4j-simple-1.6.1.jar
# Path to the HSQL DB install directory
hsql.home=C:/hsqldb

的hibernate.cfg.xml

<!DOCTYPE hibernate-configuration PUBLIC
 "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
 "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.url">
jdbc:hsqldb:file:testdb;shutdown=true
</property>
<property name="hibernate.connection.driver_class">
org.hsqldb.jdbcDriver
</property>
<property name="hibernate.connection.username">sa</property>
<property name="hibernate.connection.password"></property>
<property name="hibernate.connection.pool_size">0</property>
<property name="hibernate.dialect">
org.hibernate.dialect.HSQLDialect
</property>
<property name="hibernate.show_sql">false</property>
<!-- "Import" the mapping resources here -->
<mapping class="sample.entity.Message"/>
</session-factory>
</hibernate-configuration>

build.xml文件

<project name="sample">
    <property file="build.properties"/>
    <property name="src" location="src"/>
    <property name="bin" location="bin"/>
    <property name="sql" location="sql"/>
    <property name="hibernate.tools"
              value="${hibernate.tools.home}${hibernate.tools.path}"/>
    <path id="classpath.base">
        <pathelement location="${src}"/>
        <pathelement location="${bin}"/>
        <pathelement location="${hibernate.home}/hibernate3.jar"/>
        <pathelement location="${slf4j.implementation.jar}"/>
        <fileset dir="${hibernate.home}/lib" includes="**/*.jar"/>
        <pathelement location="${hsql.home}/lib/hsqldb.jar"/>
  <fileset dir="./lib" includes="**/*.jar"/>
    </path>
<path id="classpath.tools">
    <path refid="classpath.base"/>
    <pathelement
            location="${hibernate.tools.home}/${hibernate.tools.lib.path}/commons-logging-1.0.4.jar"/>
    <pathelement
            location="${hibernate.tools}/freemarker.jar"/>
    <pathelement
            location="${hibernate.tools}/hibernate-tools.jar"/>
</path>
<taskdef name="htools"
         classname="org.hibernate.tool.ant.HibernateToolTask"
         classpathref="classpath.tools"/>
<target name="exportDDL" depends="compile">
    <mkdir dir="${sql}"/>
    <htools destdir="${sql}">
        <classpath refid="classpath.tools"/>
        <annotationconfiguration
                configurationfile="${src}/hibernate.cfg.xml"/>
        <hbm2ddl drop="true" outputfilename="sample.sql"/>
    </htools>
</target>
<target name="compile">
    <javac srcdir="${src}" destdir="${bin}" classpathref="classpath.base"/>
</target>
<target name="populateMessages" depends="compile">
    <java classname="sample.PopulateMessages" classpathref="classpath.base"/>
</target>
<target name="listMessages" depends="compile">
    <java classname="sample.ListMessages" classpathref="classpath.base"/>
</target>

java hibernate annotations
10个回答
34
投票

您实体没有被正确注解,你必须使用@javax.persistence.Entity注解。你可以使用Hibernate扩展@org.hibernate.annotations.Entity超越什么JPA所提供,但Hibernate的注解不是一个替代品,它是一个补充。

因此,改变你的代码:

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

@Entity
public class Message { 
    ...  
}

References


-1
投票

可以通过添加下面注解上的.java @EntityScan应用使实体扫描(basePackageClasses = YourEntityClassName.class)

或者你可以在你的会话工厂设置packageToScan。 sessionFactory.setPackagesToScan(“com.all.entity”);


-2
投票

在hibernate.cfg.xml文件中,请把下面的代码

 @Bean( name="sessionFactoryConfig")
    public LocalSessionFactoryBean sessionFactoryConfig() {

        LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();

        sessionFactory.setDataSource(dataSourceConfig());
        sessionFactory.setPackagesToScan(
                new String[] { "com.springhibernate.model" });

        sessionFactory.setHibernateProperties(hibernatePropertiesConfig());

        return sessionFactory;
    }

12
投票

你应该叫.addAnnotatedClass(Message.class)AnnotationConfiguration

如果你希望你的实体是自动发现,使用EntityManager(JPA)

(Qazxswpoi)

更新:看来你已经在hibernate.cfg.xml列出的类。因此,自动发现是没有必要的。顺便说一句,尽量Reference


0
投票

你应该添加在.addAnnotatedClass(Class)方法的所有实体文件,如果类需要被自动发现。

使用此链接,它可能会帮助..

javax.persistence.Entity


0
投票

我遇到了同样的问题,当我切换到http://docs.jboss.org/hibernate/stable/core/api/org/hibernate/cfg/AnnotationConfiguration.html。我用AnnotationSessionFactoryBean之前。

我发现,我的班级是缺少以下标注其解决了我的情况的问题:

entity.hbm.xml

0
投票

在情况下,如果你得到这个例外@Entity @Table(name = "MyTestEntity") @XmlRootElement 应用,即使实体与SpringBoot注解,这可能是由于春不知道哪里来扫描实体

要明确指定的包,下面添加

Entity

注意:如果您的模型类驻留在@SpringBootApplication @EntityScan({"model.package.name"}) public class SpringBootApp {...} 注解类的相同或子包,无需显式声明SpringBootApplication,默认情况下它会扫描


0
投票

使用进口javax.persistence.Entity;取而代之的进口org.hibernate.annotations.Entity;


0
投票

下面使用的春季引导应用程序的情况下的代码行添加春启动主类@EntityScan(basePackageClasses = YourClassName.class)


0
投票

在弹簧引导应用的情况下使用下面的代码行。

@EntityScan(basePackageClasses = YourClassName.class)


0
投票

我国问题解决后加入 sessionFactory.setPackagesToScan(新的String [] { “com.springhibernate.model”});在春季启动最新版本2.1.2测试了这个功能。

完整的方法:

EntityScan
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