Questions tagged as 'nullpointerexception'

Tagged questions
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java.lang.NullPointerException error in android application

In this code the mentioned error occurs, pointing to the CarregarTelaPrincipal() method. Why is it occurring? package com.example.usuario.myapp; import android.app.Activity; import android.support.v7.app.AppCompatActivity; import andro...
asked by 22.08.2016 / 20:41
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NullPointerException when comparing two String arrays in java

I have two String arrays and when I run this: if (prod[i][0].equals(temporaria[j][0]) && prod[i][0]!= null && temporaria[j][0]!= null) I get NullPointerException without even entering the IF loop. I found it strange that...
asked by 08.09.2016 / 23:03
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java.lang.RuntimeException: Unable to instantiate activity ComponentInfo

I'm running the project on my phone, but it throws the following exception error: java.lang.RuntimeException: Unable to Instantiate Activity ComponentInfo MainActivity: public class MainActivity extends AppCompatActivity { Spinner dropdow...
asked by 19.07.2016 / 04:31
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Acquisition of data by JTable

I'm trying to get JButtonGuardar(panelInserir) to pass data entered by the user (local time text) from JPanelInserir to JPanelEventos (where is JTable) At the moment, I am not succeeding, if you have any suggestions, I wi...
asked by 21.04.2016 / 02:11
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Error trying to make a post on a php page through Android Studio

Error 03 - 12 18: 44: 46.688 23858 - 23891 / com.natanielsoares.eceller E / AndroidRuntime: FATAL EXCEPTION: AsyncTask #3 Process: com.natanielsoares.eceller, PID: 23858...
asked by 12.03.2016 / 22:57
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java.lang.NullPointerException: Attempt to invoke virtual method on a null object reference

I'm trying to insert some values in the database, but it's always giving an exception. My class that enters the bank: private String email; private int codigo; private Button btnOkay; private Button btnCancelar; private EditText codigoConf...
asked by 03.06.2016 / 07:00
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NullPointerException error when using JSF EL

When I add this line of code to my XHTML page: <f:param name="pedido" value="#{pedido.id}"/> It generates this error: jun 04, 2015 10:59:42 AM com.sun.faces.application.view.FaceletViewHandlingStrategy handleRenderException GRAVE: E...
asked by 04.06.2015 / 16:03
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NullPointerException on Android

I have a problem listing the photos in the DCIM folder on Android. Does it give the loop error for , casting java.lang.NullPointerException ? What can it be? See the code that takes the information from the folder: public class...
asked by 02.06.2015 / 16:25
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"FATAL EXCEPTION: main java.lang.NullPointerException" error in android

My code is like this private void makeJsonArryReq() { showProgressDialog(); JsonArrayRequest req = new JsonArrayRequest(Const.URL_JSON_ARRAY, new Response.Listener<JSONArray>() { @Override...
asked by 17.09.2014 / 21:08
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Crash when implementing tabs and swipeable views

I'm starting in android development and want to put tabs with swipeable views, I followed a AndroidHive because of Google tutorial did not make the slightest meaning to me. The issue is that after doing the swipe my application is crashing,...
asked by 11.07.2014 / 18:51