[英]Java Spring MVC + Hibernate - sessionFactory “unsatisfied dependency” errror
I'm in the middle of creating my first Spring + Hibernate webapp and this is what I have in console: 我正在创建我的第一个Spring + Hibernate Webapp,这就是我在控制台中所拥有的:
Root Cause
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'quizDAOImpl': Unsatisfied dependency expressed through field 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/dispatcher-servlet.xml]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: No identifier specified for entity: com.kubacki.entity.Quiz
I tried to find already existing solutions but nothing seems to work, would you be able to help me please? 我试图找到已经存在的解决方案,但似乎没有任何效果,请问您能为我提供帮助吗?
I am not sure if the issue may be caused by bad XML configuration or some mistake in coding itself, from my perspective "sessionFactory" bean is correctly configured in XML and there should be no problem with injecting it. 我不确定该问题是否是由于XML配置错误或编码本身的错误引起的,从我的角度来看,“ sessionFactory” bean是否已正确配置为XML,并且注入它应该没有问题。
Additionally, I'am using Maven for this project but I have already listed all spring + hibernate stuff in pom.xml 此外,我正在为该项目使用Maven,但我已经在pom.xml中列出了所有spring + hibernate的内容
Here is my source code: 这是我的源代码:
QuizDAO: QuizDAO:
package com.kubacki.dao;
import java.util.List;
import com.kubacki.entity.Quiz;
public interface QuizDAO {
public Quiz getQuiz(int id);
public List<Quiz> getQuizzes();
}
QuizDAOImpl: QuizDAOImpl:
package com.kubacki.dao;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.query.Query;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import com.kubacki.entity.Quiz;
@Repository
public class QuizDAOImpl implements QuizDAO {
@Autowired
private SessionFactory sessionFactory;
@Override
public Quiz getQuiz(int id) {
Session tempSession = sessionFactory.getCurrentSession();
Quiz tempQuiz = tempSession.get(Quiz.class, id);
return tempQuiz;
}
@Override
public List<Quiz> getQuizzes() {
Session tempSession = sessionFactory.getCurrentSession();
Query<Quiz> theQuery = tempSession.createQuery("from quiz", Quiz.class);
List<Quiz> tempQuizzes = theQuery.getResultList();
return tempQuizzes;
}
}
Web.xml: Web.xml:
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>WebApp</display-name>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
dispatcher-servlet.xml: dispatcher-servlet.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!-- Add support for component scanning -->
<context:component-scan base-package="com.kubacki" />
<!-- Add support for conversion, formatting and validation support -->
<mvc:annotation-driven/>
<!-- Define Spring MVC view resolver -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/view/" />
<property name="suffix" value=".jsp" />
</bean>
<!-- Step 1: Define Database DataSource / connection pool -->
<bean id="myDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close">
<property name="driverClass" value="com.mysql.jdbc.Driver" />
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/quizdb?useSSL=false" />
<property name="user" value="root" />
<property name="password" value="admin" />
<!-- these are connection pool properties for C3P0 -->
<property name="minPoolSize" value="5" />
<property name="maxPoolSize" value="20" />
<property name="maxIdleTime" value="30000" />
</bean>
<!-- Step 2: Setup Hibernate session factory -->
<bean id="sessionFactory"
class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
<property name="dataSource" ref="myDataSource" />
<property name="packagesToScan" value="com.kubacki.entity" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean>
<!-- Step 3: Setup Hibernate transaction manager -->
<bean id="myTransactionManager"
class="org.springframework.orm.hibernate5.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<!-- Step 4: Enable configuration of transactional behavior based on annotations -->
<tx:annotation-driven transaction-manager="myTransactionManager" />
</beans>
As per the error 根据错误
No identifier specified for entity: com.kubacki.entity.Quiz
I think, You are missing a field annotated with @Id
in Quiz
class. 我认为,您在
Quiz
类中缺少用@Id
注释的字段。 Each @Entity must have an @Id - this will be a primary key in your database. 每个@Entity必须具有一个@Id-这将是数据库中的主键。
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