Error with webservice in android. Object reference not set to an istance of an object

Question

0.00/5 (No votes)

See more:

Hello guys, this question may be a little long. I tried to create a method to use this WebService, however i get the error. I can use others webservice fine, but i did not created them(the method on android) Im pretty new so i would like some help.

W/System.err: SoapFault - faultcode: 'soap:Server' faultstring: 'Server was unable to process request. ---> Object reference not set to an instance of an object.' faultactor: 'null' detail: org.kxml2.kdom.Node@107d094
W/System.err: at org.ksoap2.serialization.SoapSerializationEnvelope.parseBody(SoapSerializationEnvelope.java:147)
W/System.err: at org.ksoap2.SoapEnvelope.parse(SoapEnvelope.java:140)
W/System.err: at org.ksoap2.transport.Transport.parseResponse(Transport.java:118)
W/System.err: at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:275)
W/System.err: at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:118)
W/System.err: at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:113)
W/System.err: at org.tempuri.WsCambioCotacaoSoap.validateCoupon(WsCambioCotacaoSoap.java:1004)
W/System.err: at com.rendimento.cotacao.home.onlineStore.payment.PurchaseDetailsActivity$1.run(PurchaseDetailsActivity.java:235)
W/System.err: at java.lang.Thread.run(Thread.java:761)

// line 1004 is : _ht.call("http://tempuri.org/ValidateCoupon", _envelope);

Thats all the info i got. I'm deeply sorry for the very very long question, but i really need some help here. Im a beginner i don't even know where to start, i created that method based on another webservice method that was already created(my supervisor told me to do) i can't ask him for help, because he said he knows nothing about android so i would have to google some. Can anyone help me please?

What I have tried:

I tried calling the WebService in a more simplier way, but it just crashes the app, this one atleast make the app run. (My supervisor told me to make this method based on another one created)

Posted 2-Dec-16 3:57am

Member 12883247

Updated 2-Dec-16 4:03am

v3

Add a Solution

Comments

Richard MacCutchan 2-Dec-16 10:23am

Chances are that the variable _envelope is null. Check the Android studio logs, or use adb to get more information.

Member 12883247 2-Dec-16 12:41pm

Hello Richard, thank you for your reply. Following Griff's sugestion i used the Debugger and checked the _envelope as you mentioned and i got this: _envelope = {SoapSerializationEnvelope@4836}

_envelope.bodyOut = {SoapObject@4835}

_envelope.bodyIn = null

_ht.responseDump = <soap:envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:body><soap:fault><faultcode>soap:Server<faultstring>Server was unable to process request. ---> Object reference not set to an instance of an object.<detail>

Richard MacCutchan 2-Dec-16 13:16pm

Unfortunately that still does not tell us which object is null. You need to look deeper into all the objects and their properties that are being referenced.

Member 12883247 3-Dec-16 13:25pm

Ok Richard, got it. Thank you for your help :)

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2016-12-02T04:03:00

This is one of the most common problems we get asked, and it's also the one we are least equipped to answer, but you are most equipped to answer yourself.

Let me just explain what the error means: You have tried to use a variable, property, or a method return value but it contains null - which means that there is no instance of a class in the variable.
It's a bit like a pocket: you have a pocket in your shirt, which you use to hold a pen. If you reach into the pocket and find there isn't a pen there, you can't sign your name on a piece of paper - and you will get very funny looks if you try! The empty pocket is giving you a null value (no pen here!) so you can't do anything that you would normally do once you retrieved your pen. Why is it empty? That's the question - it may be that you forgot to pick up your pen when you left the house this morning, or possibly you left the pen in the pocket of yesterdays shirt when you took it off last night.

We can't tell, because we weren't there, and even more importantly, we can't even see your shirt, much less what is in the pocket!

Back to computers, and you have done the same thing, somehow - and we can't see your code, much less run it and find out what contains null when it shouldn't.
But you can - and Visual Studio will help you here. Run your program in the debugger and when it fails, VS will show you the line it found the problem on. You can then start looking at the various parts of it to see what value is null and start looking back through your code to find out why. So put a breakpoint at the beginning of the method containing the error line, and run your program from the start again. This time, VS will stop before the error, and let you examine what is going on by stepping through the code looking at your values.

But we can't do that - we don't have your code, we don't know how to use it if we did have it, we don't have your data. So try it - and see how much information you can find out!