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问题描述
我正在做spring + hibernate的应用。当我在tomcat服务器上运行应用程序时，我收到了一些异常。下面是我的代码。这是我的配置文件。
<？xml version =1.0encoding =UTF-8？>
< beans xmlns =http://www.springframework.org/schema/beans
xmlns：xsi =http://www.w3.org/2001/XMLSchema-instance
xsi：schemaLocation =http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd\">
< bean
class =org.springframework.beans.factory.config.PropertyPlaceholderConfigurer>
< property name =location>
<值> WEB-INF / database / db.properties< /值>
< / property>
< / bean>
< bean id =dataSource
class =org.springframework.jdbc.datasource.DriverManagerDataSource>
< property name =driverClassNamevalue =$ {jdbc.driverClassName}/>
< property name =urlvalue =$ {jdbc.url}/>
< property name =usernamevalue =$ {jdbc.username}/>
< property name =passwordvalue =$ {jdbc.password}/>
< / bean>
< bean id =sessionFactory
class =org.springframework.orm.hibernate3.LocalSessionFactoryBean>
< property name =dataSource>
< ref bean =dataSource/>
< / property>
< property name =hibernateProperties>
<道具>
< prop key =hibernate.show_sql> true< / prop>
< /道具>
< / property>
< property name =mappingResources>
< list>
<值> Employee.hbm.xml< /值>
< / list>
< / property>
< / bean>
< bean id =employeeBoclass =com.saggezza.employee.bo.impl.EmployeeBoImpl>
< property name =employeeDaoref =employeeDao/>
< / bean>
< bean id =employeeDaoclass =com.saggezza.employee.dao.impl.EmployeeDaoImpl>
< constructor-arg ref =sessionFactory>< / constructor-arg>
< / bean>
这是我的dao类。
public class EmployeeDaoImpl extends HibernateDaoSupport implements EmployeeDao {
private SessionFactory sessionFactory;
public EmployeeDaoImpl（SessionFactory sessionfactory）{
this.sessionFactory = sessionfactory;
}
@Override
public List< Employee> getEmployeeDetails（）{
return getHibernateTemplate（）。find（from Employee）;
$ b 这里的另一个班员employeeBo正在调用employeeDaoImpl。
当我运行这个我得到以下例外。
org.springframework.beans.factory.BeanCreationException：创建错误在ServletContext资源中定义名为'employeeBo'的bean [/WEB-INF/spring/EmployeeBean.xml]：设置bean属性'employeeDao'时，无法解析对bean'employeeDao'的引用;嵌套的异常是org.springframework.beans.factory.BeanCreationException：在ServletContext资源[/WEB-INF/spring/EmployeeBean.xml]中定义名称为'employeeDao'的Bean时创建错误：调用init方法失败;嵌套异常是java.lang.IllegalArgumentException：'sessionFactory'或'hibernateTemplate'是必需的
任何人都可以帮忙解决这个问题。如果您有两个配置文件，那么您可以使用这个配置文件来解决这个问题。
重复'sessionFactory'的定义。删除'sessionFactory'定义之一。你会在IllegalArgumentException之前得到重复的bean定义异常。编辑：在你的评论之后，
public class EmployeeDaoImpl extends HibernateDaoSupport implements EmployeeDao {
$ b public public EmployeeDaoImpl（SessionFactory sessionfactory）{
setSessionFactory（sessionfactory）;
}
@Override
public List< Employee> getEmployeeDetails（）{
return getHibernateTemplate（）。find（from Employee）;
$ b $ / code $ / pre
或者去掉上面的构造函数代码并使用setter注入来注入'sessionFactory'。参见 org.springframework.orm.hibernate3.support.HibernateDaoSupport.setSessionFactory（SessionFactory）。我更喜欢以后的做法。
I am doing spring + hibernate apllication. When I run the application on tomcat server I am getting some exception. Below is my code.
This is my bean config file.
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<bean
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location">
<value>WEB-INF/database/db.properties</value>
</property>
</bean>
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource">
<ref bean="dataSource" />
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
<property name="mappingResources">
<list>
<value>Employee.hbm.xml</value>
</list>
</property>
</bean>
<bean id="employeeBo" class="com.saggezza.employee.bo.impl.EmployeeBoImpl">
<property name="employeeDao" ref="employeeDao" />
</bean>
<bean id="employeeDao" class="com.saggezza.employee.dao.impl.EmployeeDaoImpl">
<constructor-arg ref="sessionFactory"></constructor-arg>
</bean>
this is my dao class.
public class EmployeeDaoImpl extends HibernateDaoSupport implements EmployeeDao {
private SessionFactory sessionFactory;
public EmployeeDaoImpl(SessionFactory sessionfactory){
this.sessionFactory=sessionfactory;
}
@Override
public List<Employee> getEmployeeDetails() {
return getHibernateTemplate().find("from Employee");
}
}
Here another class employeeBo is calling the employeeDaoImpl.when I run thisI am getting the below exception.
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeeBo' defined in ServletContext resource [/WEB-INF/spring/EmployeeBean.xml]: Cannot resolve reference to bean 'employeeDao' while setting bean property 'employeeDao'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeeDao' defined in ServletContext resource [/WEB-INF/spring/EmployeeBean.xml]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: 'sessionFactory' or 'hibernateTemplate' is required
Can anybody help to resolve this. I have tried a lot and google it as well.But did get the solution.
解决方案 If you have two configuration files, you duplicates 'sessionFactory' definition. Remove one of the 'sessionFactory' definitions . You would have got duplicate bean definition exception before the IllegalArgumentException.
Edit: After your comment,
public class EmployeeDaoImpl extends HibernateDaoSupport implements EmployeeDao {
public EmployeeDaoImpl(SessionFactory sessionfactory){
setSessionFactory(sessionfactory);
}
@Override
public List<Employee> getEmployeeDetails() {
return getHibernateTemplate().find("from Employee");
}
}
or get rid of constructor in above code and inject 'sessionFactory' using setter injection.See org.springframework.orm.hibernate3.support.HibernateDaoSupport.setSessionFactory(SessionFactory). I prefer later approach.
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