Spring+Hibernate中的org.springframework.beans.factory.BeanCreationException

Question

我使用spring和Hibernate集成使用mysql创建了一个简单的java项目，其中包含一个包和3个类，一个应用程序context.xml文件，以及一个用于映射的hbm.xml，但是编程在运行时出现了exception:

org.springframework.beans.factory.BeanCreationException

这是employee.java文件

public class Employee {

    private int id;
    private String name;
    private int salary;

    public Employee() {
    }

    public Employee(int id, String name, int salary) {
        super();
        this.id = id;
        this.name = name;
        this.salary = salary;
    }

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    } 

    public void setName(String name) {
        this.name = name;
    }

    public int getSalary() {
        return salary;
    }

    public void setSalary(int salary) {
        this.salary = salary;
    }

    void display() {
        System.out.println(id + " " + name + " " + salary);
    }

}

这是test.java

public class Test {

public static void main(String[] args) {

    Resource r = new ClassPathResource("applicationContext.xml");
    BeanFactory factory = new XmlBeanFactory(r);

    EmployeeDao dao = (EmployeeDao) factory.getBean("d");

    Employee e = new Employee();
    e.setId(114);
    e.setName("varun");
    e.setSalary(50000);

    dao.saveEmployee(e);

}}

public class EmployeeDao {

HibernateTemplate template;

public void setTemplate(HibernateTemplate template) {
    this.template = template;
}  

public void saveEmployee(Employee e) {
    template.save(e);
}

public void updateEmployee(Employee e) {
    template.update(e);
}

public void deleteEmployee(Employee e) {
    template.delete(e);
}  

public Employee getById(int id) {
    Employee e = (Employee) template.get(Employee.class, id);
    return e;
}  

public List<Employee> getEmployees() {
    List<Employee> list = new ArrayList<Employee>();
    list = template.loadAll(Employee.class);
    return list;
}}

<hibernate-mapping>  
<class name="com.javatpoint.Employee" table="emp555">  
    <id name="id">  
        <generator class="assigned"></generator>  
    </id>  
    <property name="name"></property>  
    <property name="salary"></property>  
</class>              

这是applicationContext.xml

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">  
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    <property name="url" value="jdbc:mysql://localhost:3306/spring" />
    <property name="username" value="root" />
    <property name="password" value="****" />
</bean>


<bean id="mysessionFactory"  class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">  
    <property name="dataSource" ref="dataSource"></property>  

    <property name="mappingResources">  
        <list>  
            <value>employee.hbm.xml</value>  
        </list>  
    </property>  

    <property name="hibernateProperties">  
        <props>  
            <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>  
            <prop key="hibernate.hbm2ddl.auto">update</prop>  
            <prop key="hibernate.show_sql">true</prop>  

        </props>  
    </property>  
</bean>  

<bean id="template" class="org.springframework.orm.hibernate3.HibernateTemplate">  
    <property name="sessionFactory" ref="mysessionFactory"></property>  
</bean>  

<bean id="d" class="com.javatpoint.EmployeeDao">  
    <property name="template" ref="template"></property>  
</bean>  

下面是堆栈跟踪：

线程“main”org.springframework.beans.factory.beanCreationException中的异常：创建类路径资源[applicationContext.xml]中定义的名称为“'d'的bean时出错：在设置bean属性”template“时无法解析对bean”template“的引用；嵌套异常是org.springframework.beans.factory.beanCreationException：创建类路径资源[applicationContext.xml]中定义的名为“template”的bean时出错：bean实例化失败；嵌套异常是java.lang.noClassDefFounderRorr：org/hibernate/jdbcException

Answer 1

<bean id="d" class="com.javatpoint.EmployeeDao">  
    <property name="template" ref="template"></property>  
</bean>  

您已经创建了对ref=“template”的引用，但Spring找不到它。

检查是否所有必需的依赖项都可用。在这里，您应该检查org.springframework.orm.hibernate3.hibernateTemplatejar可用。