Ninja Framework mailProvider.get() gives a Null pointer exception

Question

I did everything according to instructions.

application.conf contains:

smtp.host=smtp.gmail.com
smtp.port=465
smtp.ssl=true
smtp.user=myemail@gmail.com
smtp.password=xxxxxx
smtp.debug=false

The code contains

    package controllers;


import ninja.postoffice.Mail;
import ninja.postoffice.Postoffice;
import com.google.inject.Inject;
import com.google.inject.Provider;

public class MailController {

    @Inject
    Provider<Mail> mailProvider;

    @Inject
    Postoffice postoffice;

    public void sendMail(String to) {
        try {
        Mail mail = mailProvider.get();
......

It fails at mailProvider.get() giving the java.lang.NullPointerException

What am I missing ??

EDIT, THE STACK TRACE:

java.lang.NullPointerException
        at controllers.MailController.sendMail(MailController.java:19)
        at controllers.RegisterResendController.confirmation(RegisterResendController.java:37)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at ninja.params.ControllerMethodInvoker.invoke(ControllerMethodInvoker.java:57)
        at ninja.FilterChainEnd.next(FilterChainEnd.java:49)
        at ninja.NinjaDefault.onRouteRequest(NinjaDefault.java:102)
        at ninja.servlet.NinjaServletDispatcher.service(NinjaServletDispatcher.java:86)
        at com.google.inject.servlet.ServletDefinition.doServiceImpl(ServletDefinition.java:287)
        at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:277)
        at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:182)
        at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)
        at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:85)
        at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:119)
        at com.google.inject.servlet.GuiceFilter$1.call(GuiceFilter.java:133)
        at com.google.inject.servlet.GuiceFilter$1.call(GuiceFilter.java:130)
        at com.google.inject.servlet.GuiceFilter$Context.call(GuiceFilter.java:203)
        at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:130)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
        at org.eclipse.jetty.server.Server.handle(Server.java:497)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
        at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
        at java.lang.Thread.run(Thread.java:745)

Possible duplicate of [What is a Null Pointer Exception, and how do I fix it?](http://stackoverflow.com/questions/218384/what-is-a-null-pointer-exception-and-how-do-i-fix-it) — ΦXocę 웃 Пepeúpa ツ, Dec 09 '15 at 15:44

score 2 · Accepted Answer · answered Dec 09 '15 at 17:50

2

Somehow your RegisterResendController must get an instance of MailController. I suspect that instance of MailController is not injected into RegisterSendController. And therefore lacking any instances provided by Guice. Make sure you don't create instances of your class on your own (via 'new MailController' and such).

Please also paste line numbers and RegisterSendController if you want to get more feedback.

answered Dec 09 '15 at 17:50

Ra_

569
5
13

That is probably what the case is, I will let you know as soon as I test it. – 3xCh1_23 Dec 09 '15 at 18:24

Ninja Framework mailProvider.get() gives a Null pointer exception

1 Answers1