我是Spring和Hibernate的新手。我尝试使用JSF，Spring和Hibernate创建一个简单的应用程序。当我尝试通过Eclipse运行应用程序时，我收到此错误
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'AddressBean' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.address.AddressBean]: Constructor threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:883)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:839)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:440)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
at java.security.AccessController.doPrivileged(Native Method)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:221)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:729)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:381)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:255)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:45)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3972)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4467)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:519)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.address.AddressBean]: Constructor threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:115)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:61)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:877)
... 31 more
Caused by: java.lang.NullPointerException
at com.util.FacesUtil.getServletContext(FacesUtil.java:33)
at com.address.AddressBean.<init>(AddressBean.java:19)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:100)
... 33 more
视图的相关部分
<h:outputText value="Address:"/>
<h:inputText value="#{addressBean.address.address}"/><br />
<h:outputText value="City:"/>
<h:inputText value="#{addressBean.address.city}"/><br />
<h:outputText value="Contact Id:"/>
<h:inputText value="#{addressBean.address.contactId}"/><br />
<h:outputText value="Country:"/>
<h:inputText value="#{addressBean.address.country}"/><br /><br />
<h:commandButton value="Submit" action="#{addressBean.addAddress}" />
这是我的AddressBean
public AddressBean()
{
ServletContext servletContext = FacesUtil.getServletContext();
this.context = WebApplicationContextUtils
.getRequiredWebApplicationContext(servletContext);
}
public String addAddress()
{
dao = (AddressDAOImpl)context.getBean("AddressDAOImpl");
dao.saveAddress(address);
return "";
}
这是我的applicationcontext.xml代码
<!-- Hibernate SessionFactory Definition -->
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="mappingResources">
<list>
<value>
com/address/Address.hbm.xml
</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
<prop key="hibernate.cglib.use_reflection_optimizer">
true
</prop>
<prop key="hibernate.cache.provider_class">
org.hibernate.cache.HashtableCacheProvider
</prop>
<prop key="hibernate.connection.useUnicode">true</prop>
<prop key="hibernate.connection.characterEncoding">UTF-8</prop>
</props>
</property>
<property name="dataSource">
<ref bean="dataSource" />
</property>
</bean>
<!-- Spring Data Access Exception Translator Definition -->
<bean id="jdbcExceptionTranslator"
class="org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator">
<property name="dataSource">
<ref bean="dataSource" />
</property>
</bean>
<!-- Hibernate Template Definition -->
<bean id="hibernateTemplate"
class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
<property name="jdbcExceptionTranslator">
<ref bean="jdbcExceptionTranslator" />
</property>
</bean>
<bean id="AddressBean"
class="com.address.AddressBean">
<property name="hibernateTemplate">
<ref bean="hibernateTemplate" />
</property>
<property name="addressDAO">
<ref bean="addressDAO" />
</property>
<property name="sessionFactory">
<ref local="sessionFactory" />
</property>
</bean>
<!-- ========================= Start of SERVICE DEFINITIONS =========================
-->
<!-- Hibernate Transaction Manager Definition -->
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory">
<ref local="sessionFactory" />
</property>
</bean>
请纠正我的错误。如果遗漏任何细节，请更新我。
更新 @chkal我按照你的说法尝试并按照这个tutorial修改了applicationcontext.xml文件，如下所示
<bean id="dao" class="com.address.AddressDAO">
</bean>
<bean id="addressBean"
class="com.address.AddressBean">
<property name="dao">
<ref local="dao" />
</property>
</bean>
现在错误如下
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dao' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.address.AddressDAO]: Specified class is an interface
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:883)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:839)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:440)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
at java.security.AccessController.doPrivileged(Native Method)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
at org.springframework.beans.factory.support.AbstractBeanFact....
如果我完全错了，请为像我这样的初学者建议一个很好的教程
提前致谢
答案 0 :(得分：2)
您似乎正在尝试使用常规JSF托管bean和一些解决方法来获取对Spring管理的bean的引用（如DAO）。
这不是推荐的处理方法。你应该看看JSF integration of Spring。如果您使用这种方式，则根本不需要使用JSF托管bean。您只需将JSF bean声明为常规Spring bean，并且可以像使用常规JSF托管bean一样使用EL表达式来访问它们。然后你也可以使用@Autowired将其他Spring bean（比如你的DAO）注入你的JSF bean。
将此添加到您的faces-config.xml：
<faces-config>
<application>
<el-resolver>org.springframework.web.jsf.el.SpringBeanFacesELResolver</el-resolver>
</application>
</faces-config>
然后将AddressBean更改为以下内容：
@Component("addressBean")
@Scope("request")
public class AddressBean {
@Autowired
private AddressDAO dao;
public String addAddress()
{
dao.saveAddress(address);
return "";
}
}
您甚至不必更改视图，因为此示例会将AddressBean添加到名为addressBean的EL上下文中。