My SessionFactory object is @Autowired
package com.ravi.dao.daoImpl;
import java.util.List;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import com.ravi.dao.UserDao;
import com.ravi.model.User;
@Repository("userDao")
public class UserDaoImpl implements UserDao {
@Autowired
private SessionFactory sessionFactory;
@SuppressWarnings("unchecked")
public List<User> listUsers()
{
System.out.println("UserDaoImpl - listUsers");
return (List<User>) sessionFactory.getCurrentSession().createCriteria(User.class).list();
}
@Override
public void saveUser(User user)
{
System.out.println("UserDaoImpl - saveUser");
sessionFactory.getCurrentSession().saveOrUpdate(user);
}
@SuppressWarnings("unchecked")
@Override
public List<User> getUserByUserEmail(String userEmail)
{
System.out.println("UserDaoImpl - getUserByUserEmail");
return sessionFactory.getCurrentSession().createQuery("from User where userEmail=:userEmail").setString("userEmail",userEmail).list();
}
@SuppressWarnings("unchecked")
@Override
public List<User> validateLoginUser(String userEmail, String password)
{
System.out.println("userEmail -- "+userEmail+" password --"+password);
System.out.println("UserDaoImpl - validateLoginUser");
return sessionFactory.getCurrentSession().createQuery("from User where userEmail=:userEmail and password=:password").setString("userEmail", userEmail).setString("password",password).list();
}
}
i create on dwr function which is below.
package com.ravi.dwr;
import java.util.List;
import com.ravi.dao.daoImpl.UserDaoImpl;
import com.ravi.model.User;
public class ForgotPwd
{
public void sendMail(String EmailId)
{
System.out.println("DWR Called.");
UserDaoImpl userDaoImpl=new UserDaoImpl();
List<User> lstUser=userDaoImpl.getUserByUserEmail(EmailId);
User user=lstUser.get(0);
System.out.println("DWR Called.-- userEmail :"+user.getUserEmail());
}
}
when i want to try to print userEmail . null pointer exception is generated @ return sessionFactory.getCurrentSession().createQuery("from User where userEmail=:userEmail").setString("userEmail",userEmail).list(); this point.
my spring-servlet.xml cofiguration.
<?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-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<context:property-placeholder location="classpath:jdbc.properties" />
<context:component-scan base-package="com.ravi"/>
<tx:annotation-driven transaction-manager="hibernateTransactionManager" />
<mvc:annotation-driven />
<bean id="jspViewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/view/" />
<property name="suffix" value=".jsp" />
</bean>
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${database.driver}" />
<property name="url" value="${database.url}" />
<property name="username" value="${database.user}" />
<property name="password" value="${database.password}" />
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<!-- <bean id="sessionFactory" -->
<!-- class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> -->
<property name="dataSource" ref="dataSource" />
<property name="annotatedClasses">
<list>
<value>com.ravi.model.User</value>
<value>com.ravi.model.Language</value>
<value>com.ravi.model.Questions</value>
<value>com.ravi.model.QuestionOptions</value>
<value>com.ravi.model.Admin</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
</props>
</property>
</bean>
<bean id="hibernateTransactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="SessionFactory" ref="sessionFactory" />
</bean>
<bean id="messageSource"
class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property name="basename" value="/WEB-INF/messages" />
</bean>
in my project i used Annotation. is there any way to get user model data in dwr function.
or is there any process which automatically initialized (inject) when i try to use DAO class)
i don't want to remove @Autowired annotation in sessionFactory object. so please suggest me the best way to access or configure dwr function. other way i tried without using @Autowired annotation but in that case i have to entry all bean class in my spring-servlet.xml and also configure. hibernate.cfg.xml file.
in my project i used Annotation. is there any way to get user model data in dwr function.
or is there any process which automatically initialized (inject) when i try to use DAO class)
here i explain whole process. thank you in advance.
below error is generated when i am try to access userDaoImpl function. it is error show that session factory object is not initialized.
on more time i cleared that this is DWR function. which try to access sessionFactory instance.
without interacting controller.
UserLoginController --> showUserLogin
INFO (org.directwebremoting.log.startup:157) - Starting: DwrServlet v3.0.0-RC2-final-312 on Apache Tomcat/7.0.50 / JDK 1.7.0_10 from Oracle Corporation at `enter code here`/OnlineQuestion
DWR Called.
INFO (org.directwebremoting.log.accessLog:427) - Method execution failed:
java.lang.NullPointerException
at com.ravi.dwr.ForgotPwd.sendMail(ForgotPwd.java:22)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.directwebremoting.impl.CreatorModule$1.doFilter(CreatorModule.java:229)
at org.directwebremoting.impl.CreatorModule.executeMethod(CreatorModule.java:241)
at org.directwebremoting.impl.DefaultRemoter.execute(DefaultRemoter.java:379)
at org.directwebremoting.impl.DefaultRemoter.execute(DefaultRemoter.java:332)
at org.directwebremoting.dwrp.BaseCallHandler.handle(BaseCallHandler.java:104)
at org.directwebremoting.servlet.UrlProcessor.handle(UrlProcessor.java:120)
at org.directwebremoting.servlet.DwrServlet.doPost(DwrServlet.java:141)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChai
这里我解释整个过程。先感谢您。 当我尝试访问userDaoImpl函数时生成以下错误。错误显示会话工厂对象未初始化。 在更多的时间我清除这是DWR功能。试图访问sessionFactory实例。 没有交互控制器。
答案 0 :(得分：0)
假设您要将Spring MVC与DWR一起使用，请尝试以下代码：
WEB-INF / web.xml中：
<?xml version="1.0" encoding="UTF-8"?>
<web-app ...>
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
WEB-INF /弹簧servlet.xml中：
<?xml version="1.0" encoding="UTF-8"?>
<beans
...
xmlns:dwr="http://www.directwebremoting.org/schema/spring-dwr"
...
http://www.directwebremoting.org/schema/spring-dwr
http://www.directwebremoting.org/schema/spring-dwr-3.0.xsd">
<dwr:controller id="dwrController" />
<dwr:annotation-scan base-package="com.ravi.dwr" />
<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="alwaysUseFullPath" value="true" />
<property name="mappings">
<props>
<prop key="/dwr/**/*">dwrController</prop>
</props>
</property>
</bean>
<context:component-scan base-package="com.ravi" />
...
</beans>
ForgotPwd.java
package com.ravi.dwr;
...
import org.directwebremoting.annotations.RemoteMethod;
import org.directwebremoting.annotations.RemoteProxy;
...
@RemoteProxy
public class ForgotPwd {
@Autowired
private UserDaoImpl userDaoImpl;
...
@RemoteMethod
public void sendMail(String EmailId) {
System.out.println("DWR Called.");
List<User> lstUser=userDaoImpl.getUserByUserEmail(EmailId);
...
}
...
}