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스프링 MVC를 사용하여 폼 데이터를 데이터베이스에 유지하려고 시도하고 최대 절전 모드이지만 hibernate session.getSession.save의 save 메서드를 호출 할 때 NullPointerException이 반환됩니다. 여기 스프링 MVC에서 java.lang.NullPointerException 가져 오기
내 index.jsp를<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Welcome to Spring Web MVC project</title>
</head>
<body>
<form action="insert.htm">
<label> Name:</label><input type="text" name="name"><br>
<label> Id:</label><input type="text" name="id"><br>
<input type="submit" value="Enter">
</form>
</body>
</html>
을의 코드 그리고 여기에 web.xml 파일을입니다
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
그리고 내 디스패처-servlet.xml 파일은
<bean class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean" id="sessionFactory">
<property name="dataSource" ref="dataSource" />
<property name="annotatedClasses">
<list>
<value>com.model.Student</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
</props>
</property>
</bean>
<bean id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource"
p:driverClassName="oracle.jdbc.driver.OracleDriver"
p:url="jdbc:oracle:thin:@localhost:1521:Xe"
p:username="hibernate"
p:password="hibernate"></bean>
<bean id="hibernatetransactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
입니다 그리고 여기 내 모델 클래스 학생
123,그리고 내 컨트롤러는
여기@Controller
public class MyController {
@Autowired
private Dao d;
@RequestMapping(value="/insert.htm",method = RequestMethod.GET)
public ModelAndView insert(HttpServletRequest req,Student s)
{
String name=req.getParameter("name");
int id=Integer.parseInt(req.getParameter("id"));
s.setId(id);
s.setName(name);
System.out.println(s.getName());
d.save(s);
return new ModelAndView("display","Student",s);
}
이
@Repository
public class Dao {
@Autowired
private SessionFactory sessionFactory;
public int save(Student s)
{
/*Session s1=sf.openSession();
s1.beginTransaction();
int i=(Integer)s1.save(s);
s1.getTransaction().commit();
return i;*/
int i=(Integer)sessionFactory.getCurrentSession().save(s);
return i;
}
}
예외
SEVERE: Servlet.service() for servlet [dispatcher] in context with path [/Spring5]
threw exception [Request processing failed; nested exception
at com.controller.MyController.insert(MyController.java:30)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at s un.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(Ha ndlerMethodInvoker.java:176)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:436)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:424)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.jav a:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
나는 초심자 나는 내가 MyController에에 d.save (들)에 얻고 내 다오입니다 봄 mvc 나를 도와주세요. 나는 또한 @Autowired를 사용한 인서트를 호출하는 동안 은 내가
이
어떤 줄이'MyController'의 36 줄입니까? –
MyController 인 컨트롤러 클래스의 d.save (s) –
@Rahul sessionFactory라는 이름의 SessionFactory 참조가 있지만 openSession()을 호출하는 데 sf를 사용하고 있습니까? .... 두 개의 SessionFactory가 구성되어 있습니까? ... 그리고 또한 어디에서 학생 객체를 초기화 했습니까? –