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Question

我收到此错误：

org.hibernate.MappingException: Unknown entity: xxx.model.Application

但是一切看起来都已正确配置。有人能看看我是否缺少什么吗？

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="location" value="file:/dctm/db.props"/>
</bean>

<bean id="xxxDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource" destroy-method="close">
    <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"/>
    <property name="url" value="${db.url}"/>
    <property name="username" value="${db.username}"/>
    <property name="password" value="${db.password}"/>
</bean>

<bean id="xxxSessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="xxxDataSource"/>

    <property name="annotatedClasses">
    <list>
        <value>xxx.model.Application</value>
    </list>
        </property>

    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${db.dialect}</prop>
            <prop key="hibernate.show_sql">${db.debug_sql}</prop>
            <prop key="hibernate.c3p0.minPoolSize">1</prop>
            <prop key="hibernate.c3p0.maxPoolSize">5</prop>
            <prop key="hibernate.c3p0.timeout">${db.timeout}</prop>
            <prop key="hibernate.c3p0.max_statement">50</prop>
            <prop key="hibernate.c3p0.testConnectionOnCheckout">false</prop>
            <prop key="hibernate.current_session_context_class">thread</prop>
        </props>
    </property>
</bean>

<bean id="patiDao" class="xxx.dao.hibernate.PatiHibernateDao">
    <property name="sessionFactory" ref="xxxSessionFactory"/>
</bean>

Answer 1

您可能缺少@Entity

@Entity
@Table(name="COURSES")
public class Application{
  //some code
}

Answer 2

我发现这个错误有两个原因。首先，如果您错过了 Application 类中的 @Entity 。第二个是 Application 类不在构建路径中并且未部署到 JBoss。

Answer 3

您使用 JPA 还是直接使用 Hibernate？如果您使用 JPA，请尝试定义 META-INF/persistence.xml，您将在其中定义带注释的实体类：

<persistence-unit name="myPU" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <non-jta-data-source>java:/MyDS</non-jta-data-source>
    <class>xxx.model.Application</class>
    <class>xxx.model.Class2</class>
    <exclude-unlisted-classes />
</persistence-unit>

Answer 4

您可以尝试通过为其 packagesToScan 属性提供值，让 AnnotationSessionFactoryBean 找到 @Entity 类本身（通过类路径扫描）使用 annotatedClasses 属性手动指定类。