java.lang.NullPointerException
    com.hope.mobilehope.common.Messsageservice.sendMail(Messsageservice.java:26)
    com.hope.mobilehope.controller.Authcodegen.getactivationkey(Authcodegen.java:28)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
below is my sample code




@Service("messsageservice")
public class Messsageservice {
    @Autowired
    private MailSender mailSender;
    /*@Autowired
    private MailSender mailSender;
    */
     @RequestMapping(method = RequestMethod.POST)
    public void sendMail(String from, String to, String subject, String body) {

        SimpleMailMessage message = new SimpleMailMessage();

        message.setFrom(from);
        message.setTo(to);
        message.setSubject(subject);
        message.setText(body);
        mailSender.send(message);

    }


}







@RestController
public class Authcodegen {
     Messsageservice msgservice=new Messsageservice();
 @RequestMapping(value = "/activationkeygenerator", method = RequestMethod.GET,headers="Accept=application/json")
 public Authcode getactivationkey( @RequestParam(value="email") String name){
     Authcode authcode = new Authcode();
     Random rnd = new Random();
     String to_email=name;
     int n = 100000 + rnd.nextInt(900000);
     String code=String.valueOf(n);
     msgservice.sendMail("ethonnoreply@gmail.com", to_email, "authcode", code);
     authcode.setId(n);
     authcode.setStatus("Sucess");
 return authcode;

  }

}










xml file
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:context="http://www.springframework.org/schema/context"
 xmlns:mvc="http://www.springframework.org/schema/mvc" 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-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/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

 <mvc:annotation-driven/>
<context:component-scan base-package="com.hope.mobilehope.controller" />

<context:component-scan base-package="com.hope.mobilehope.common"/>



  <bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
        <property name="host" value="smtp.gmail.com"/>
        <property name="port" value="587"/>
        <property name="username" value="ethonnoreply@gmail.com"/>
        <property name="password" value="ethon123"/>
        <property name="javaMailProperties">
            <props>
                <!-- Use SMTP transport protocol -->
                <prop key="mail.transport.protocol">smtp</prop>
                <!-- Use SMTP-AUTH to authenticate to SMTP server -->
                <prop key="mail.smtp.auth">true</prop>
                <!-- Use TLS to encrypt communication with SMTP server -->
                <prop key="mail.smtp.starttls.enable">true</prop>
                <prop key="mail.debug">true</prop>
            </props>
        </property>
    </bean>


</beans>