java - Spring mvc with jdbc template -


i want implements simple login spring mvc , jdbc template. getting null pointer exception. have included spring-core.jar,spring-jdbc.jar,spring-txn.jar,spring-web.jar..

    ****complete stack trace:****        may 17, 2015 6:54:54 pm org.apache.catalina.core.standardwrappervalve invoke severe: servlet.service() servlet [login] in context path [/mvcwithjdbc] threw exception [request processing failed; nested exception java.lang.nullpointerexception] root cause java.lang.nullpointerexception     @ com.mvc.dao.logindaoimpl.getlogindetails(logindaoimpl.java:25)     @ com.mvc.controller.logincontroller.handlerequest(logincontroller.java:30)     @ org.springframework.web.servlet.mvc.simplecontrollerhandleradapter.handle(simplecontrollerhandleradapter.java:48)     @ org.springframework.web.servlet.dispatcherservlet.dodispatch(dispatcherservlet.java:771)     @ org.springframework.web.servlet.dispatcherservlet.doservice(dispatcherservlet.java:716)     @ org.springframework.web.servlet.frameworkservlet.processrequest(frameworkservlet.java:647)     @ org.springframework.web.servlet.frameworkservlet.dopost(frameworkservlet.java:563)     @ javax.servlet.http.httpservlet.service(httpservlet.java:646)     @ javax.servlet.http.httpservlet.service(httpservlet.java:727)     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:303)     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:208)     @ org.apache.tomcat.websocket.server.wsfilter.dofilter(wsfilter.java:52)     @ org.apache.catalina.core.applicationfilterchain.internaldofilter(applicationfilterchain.java:241)     @ org.apache.catalina.core.applicationfilterchain.dofilter(applicationfilterchain.java:208)     @ org.apache.catalina.core.standardwrappervalve.invoke(standardwrappervalve.java:220)     @ org.apache.catalina.core.standardcontextvalve.invoke(standardcontextvalve.java:122)     @ org.apache.catalina.authenticator.authenticatorbase.invoke(authenticatorbase.java:504)     @ org.apache.catalina.core.standardhostvalve.invoke(standardhostvalve.java:170)     @ org.apache.catalina.valves.errorreportvalve.invoke(errorreportvalve.java:103)     @ org.apache.catalina.valves.accesslogvalve.invoke(accesslogvalve.java:950)     @ org.apache.catalina.core.standardenginevalve.invoke(standardenginevalve.java:116)     @ org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:421)     @ org.apache.coyote.http11.abstracthttp11processor.process(abstracthttp11processor.java:1074)     @ org.apache.coyote.abstractprotocol$abstractconnectionhandler.process(abstractprotocol.java:611)     @ org.apache.tomcat.util.net.jioendpoint$socketprocessor.run(jioendpoint.java:316)     @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1145)     @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:615)     @ org.apache.tomcat.util.threads.taskthread$wrappingrunnable.run(taskthread.java:61)     @ java.lang.thread.run(thread.java:745)      **web.xml:**          <?xml version="1.0" encoding="utf-8"?>         <web-app xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="webapp_id" version="2.5">           <display-name>mvcmultpleactions</display-name>           <welcome-file-list>            <welcome-file>login.jsp</welcome-file>           </welcome-file-list>            <servlet>             <servlet-name>login</servlet-name>             <servlet-class>                  org.springframework.web.servlet.dispatcherservlet               </servlet-class>             <load-on-startup>1</load-on-startup>           </servlet>           <servlet-mapping>             <servlet-name>login</servlet-name>             <url-pattern>*.ak</url-pattern>           </servlet-mapping>           </web-app>      **login-servlet.xml:**          <?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:p="http://www.springframework.org/schema/p"               xsi:schemalocation="http://www.springframework.org/schema/beans                          http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">            <bean name="/login.ak" class="com.mvc.controller.logincontroller"> </bean>          <bean class="org.springframework.web.servlet.view.internalresourceviewresolver">               <property name="prefix" value="/web-inf/jsp/" />               <property name="suffix" value=".jsp" />          </bean>         <bean id="ds" class="org.springframework.jdbc.datasource.drivermanagerdatasource">           <property name="driverclassname" value="oracle.jdbc.driver.oracledriver" />           <property name="url" value="jdbc:oracle:thin:@localhost:1521:xe" />           <property name="username" value="system" />           <property name="password" value="mysql" />           </bean>                <bean id="logindao" class="com.mvc.dao.logindaoimpl">           <property name="datasource" ref="ds"></property>          </bean>         </beans>          **dao classes:**         package com.mvc.dao;      import javax.sql.datasource;      import org.springframework.beans.factory.annotation.autowired;     import org.springframework.jdbc.core.jdbctemplate;     import org.springframework.jdbc.core.support.jdbcdaosupport;     import org.springframework.jdbc.datasource.drivermanagerdatasource;      import com.mvc.mapper.*;     import com.mvc.dto.logindto;      public class logindaoimpl extends jdbcdaosupport implements logindao {          @override         public logindto getlogindetails(string username) {             // todo auto-generated method stub             system.out.println("username:"+username);             string query="select password login username=?";             system.out.println("query"+query);             return getjdbctemplate.queryforobject(query,new object[]{username},new loginmapper());              }      }      **controller:**          package com.mvc.controller;          import javax.servlet.http.httpservletrequest;         import javax.servlet.http.httpservletresponse;          import org.springframework.context.applicationcontext;         import org.springframework.context.support.classpathxmlapplicationcontext;         import org.springframework.web.servlet.modelandview;         import org.springframework.web.servlet.mvc.controller;          import com.mvc.dao.logindaoimpl;         import com.mvc.dto.logindto;          public class logincontroller implements controller{              @override             public modelandview handlerequest(httpservletrequest req,                     httpservletresponse res) throws exception {                 // todo auto-generated method stub                 string name=req.getparameter("username");                 string password=req.getparameter("password");                 logindaoimpl login=new logindaoimpl();                 logindto logindto=new logindto();                 logindto.setusername(name);                 logindto.setpassword(password);                 system.out.println("pw:"+password);                 string pw=login.getlogindetails("admin").getpassword();                 system.out.println("dao pw:"+pw);                 if(password.equalsignorecase(pw))                 {                      string message = "hello "+name;                         return new modelandview("hellopage", "message", message);                     }                     else{                               return new modelandview("errorpage", "message","sorry, username or password error");                           }                }           }

you can extend jdbcdaosupport 

public class logindaoimpl extends jdbcdaosupport implements logindao { //codes }

while jdbctemplate setter method can removed implementation class.

and can see tutorial reference of answer.


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