Most voted "nullpointerexception" questions
Use this tag when the question refers to some information or problem relating exclusively to Nullpointerexception. An exception of type Nullpointerexception, is thrown by Java when an application tries to access an object but its reference is null.
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answers658
viewsJavafx: Location is required
This is the main code, I’m having problems regarding Fxmlloader, because I’ve tried several ways and the path is never found. package com.quixada.ufc.fbd.main; import java.util.ArrayList; import…
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answer2389
viewsError Attempt to invoke virtual method 'android.view.View android.view.Window.findViewById(int)' on a null Object Reference
I’m with this error and I can’t fix it, it works every time I run the app. Logcat: 01-15 16:09:03.380 2473-2473/com.prjctt.allan.financeiro E/AndroidRuntime﹕ FATAL EXCEPTION: main Process:…
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answer903
viewsHow to resolve the error Caused by: java.lang.Nullpointerexception in getSessionFactory()
Is popping this error message for me Here are the lines that gave error: public class HibernateUtil { private static final SessionFactory sessionFactory = buildSessionFactory(); private static…
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answers96
viewsNullpointerexception when deleting register
Good morning. I have a problem I can’t solve. I am developing my first Android app and bumped into this error, Sqlite can not work with Context. I did some research and I couldn’t find a solution. I…
android sqlite nullpointerexception android-context android-recyclerviewasked 8 years, 8 months ago Charles Presidente 91 -
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answer140
viewsNullpointerexception on login screen
I have this Nullpointerexception error and I don’t know pq. I have only one login screen, one dao that takes two parameters, email and password: java.lang.NullPointerException at…
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answers77
viewsNullpointexception in the register method
Does anyone know how to solve this nullPointExcetion? In the second way I am using two combobox Follows the class Clientedao package DAO; import Beans.ClienteBeans; import Utilitarios.Conexao;…
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answer1228
viewsNullpointerexception error when running java Maven project
I created a Maven Java Application project and only created a layout of a screen. When I try to run, it shows the error of NullPointer, I have not yet implemented any code other than the IDE’s own.…
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answers212
viewsWhy of Null Pointer Exception in simple Java agenda program, and how to configure the function that returns an array of phones
Good evening! I’m having a problem with a college job, which is apparently simple (however, I’m very Noob in Java, and I don’t know what to do!). I would like you to help me, I am receiving Null…
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answers129
viewsStart service with Timertask
I am trying to start an Android notification service with Timertask but returns me the following error: 02-03 16:06:00.164 15051-15379/com.celiogarcia.setapp E/AndroidRuntime﹕ FATAL EXCEPTION:…
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answers496
viewsjavax.faces.el.Evaluationexception: java.lang.Nullpointerexception
You guys are my last salvation. I get this mistake javax.faces.el.EvaluationException: java.lang.NullPointerException when I try to register a client. My experience with development is low, I am…
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answers188
viewsProblems running Java class
When I will invoke the method of this class: package newpackage; import java.util.ArrayList; import javax.swing.JOptionPane; public class Operacoes { /* DESENVOLVIDO BY: "IIJM Team" */ Cliente…
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answers62
viewsNullpointerexception error
I have a program that does biometric authentication in two versions: 1) User selects binary file via javax.swing as follows: public class Busca extends javax.swing.JFrame { ...…
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answer52
viewsNullpointerexception in WSO2 DSS 3.0.0
I am having problems in a Data Service in WSO2 DSS 3.0.0. If I execute the query directly in the database no error happens. The database is a Sybase 12. Could someone help? DBS <data…
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answers380
viewsError in getWritableDatabase()
I’m trying to open the database to enter values in the class CadSalario, but I’m making a mistake in dbHelper.getWritableDatabase(); and I looked on the net and I have to call a context, someone can…
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answers303
viewsAndroid app => Unfortunately project has stopped
I’m studying Android and want to make a simple parameter pass to another Activity but the application is finished in the emulator and logCat shows a Nullpointerexception, someone can help me? Class:…
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answer90
viewsNullpointer Exception error when bringing Fragment data
I have a Nullpointerexception error when trying to return data from a Fragment. NPE error is right on this line: String comentarioFoto = fragment_obj.campoComentarioFoto.getText().toString(); Check…
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answers68
viewsNullpointerexception on a Servlet when using Datavoting method
I’m working with a Servlet however, this giving error java.lang.NullPointerException when I use the object method DataVoting. Follows the code: @Override protected void doGet(HttpServletRequest…
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answer324
viewsTarget Unreachable, 'reply' returned null - Selectoneradio
I’m not getting the value of mine selectOneRadio, comes as null: <p:dataTable id="exibePerguntas" var="questao" paginator="true" rowsPerPageTemplate="2,3,5,10,12" paginatorPosition="bottom"…
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answers77
viewsApplication is returning Nullpointerexception error although the object is set
Error while clicking save the new process after assigning the data in each field: java.lang.NullPointerException: Attempt to invoke virtual method 'long…
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answer54
viewsError when trying to set custom Actionbar: java.lang.Nullpointerexception
I’m trying to customize my Actionbar but whenever I try to emulate the application it closes and returns me the following error in Logcat: 01-07 16:21:57.092 1388-1388/br.com.jeiferson.agenda…
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answer213
viewsMethod imageView.getDrawable() launches Nullpointerexception
I wanted to take Imageview’s drawable and convert it to a bitmap. The conversion method I already have and is working well however, when I request the execution, it presents the following error:…
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answer143
viewsI’m having trouble connecting SQL with java
Well... I did some classes, and it was time to connect to search for a data in the bank; Ok. He had already connected with the BD, however, when I did the class to fetch the data, he keeps giving…
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answer94
viewsNullpointerexception error in setMyLocationEnabled()
I am developing an app that has as its main function to capture the user’s location. I already made a code but it error, I do not know if it is complete, I did following examples of the internet:…
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answer1335
viewsjava.lang.Nullpointerexception: Attempt to invoke virtual method
My program gave this problem when I tried to create a stack (database), to store strings on my Android app package com.project.meuapp2; import android.content.Intent; import…
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answer58
viewsException in Thread "Main" java.land.Nullpointerexception com.Login.Login.mai(Login.java:18)
Today I tried to make a login system (again), only this time I used a array one-dimensional to guard my values. When I ran my program, Eclipse had an error (null pointer to be more specific), my…
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answers57
viewsNullpointerexception error when obtaining location
I’m making an app that shows user coordinates: This works properly and checks if the GPS is released: public void verificaGPS(){ if (ActivityCompat.checkSelfPermission(this,…
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answer63
viewsAndroid: Listview custom this with error while simulating
I implemented a basic custom Listview, but this giving the error: java.lang.Runtimeexception: Unable to start Activity ComponentInfo{goodeal.listview/goodeal.listview.MainActivity}:…
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answer212
viewsFill in textview android studio/sql server
Good guys, can’t fill a textview using a sql server database. Can anyone help me? Here’s what I have on onCreate: connectionClass = new MainActivity(); text = (TextView)…
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answer1116
viewsNullpointerexception: Attempt to invoke virtual method
I’m trying to pass information on a Activity to another through the position on the list, but is giving this error of nullpointer. Where I get the information - Main Activity @Override protected…
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answer516
viewsCreating music player application with Jlayer
I am trying to create a Java application that receives a song through JFileChooser and add this song to a list (ArrayList<File>). But when accessing the file array.getindex(0).getPath(), the…
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answer78
viewsNullpointerexception when trying to mount an Activity to show a video
My code: public class VideoActivity3 extends Activity { public final static String LOCATION3 = "com.compdigitec.VideoActivity3.location3"; public final static String mFilePath = ""; @Override…
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answer104
viewsClick Jpanel does not work
I am creating an interface for a system and would like that when the user clicks on a JPanel, open another window. The program is compiled normally, but at the moment I click on JPanel, does not…
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answer272
viewsI can’t get some strings from the strings.xml
I want to get a String that is in the strings.xml file, but always gives the following error: java.lang.RuntimeException: Unable to instantiate activity…
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answer197
viewsPreferenceactivity#findPreference() returns null
someone could help with the error below? I’m beginner with android and could not identify where I missed. Thank you! Log Bug 01-22 11:45:32.722 13037-13037/com.example.android.sunshine.app…
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answers19
viewsPTBR FATAL EXCPETION:main java.lang.Runtimeexception - window get call back
I am making an application that needs to swap between screens and appears the following error: early java.: package com.example.deadsec.gerflores; import android.content.Intent; import…
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answers79
viewsHow to start an array in another class - java
I’m trying to implement the Depth first algorithm to solve a maze, like the one below, where the starting position is S and the output is E _SW______\n _WWW_W_WW\n _____W__E\n In the Mazereader…
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answer66
viewsNullpointerexception at return of method
I am making a method to search the user logged in to the database. I’m having a NullPointerException in the return of this method @RequestMapping(value = "/usuarioLogado", consumes =…
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answer126
viewsNullpointerexception when running Listview.setAdapter (Android)
i am implementing an application where I need to display a list of Dogs (already registered in BD) and allow clicking on an item in the list to display a new activy to edit the data. The problem is…
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answer121
viewsNullpointerexception in database connection
Anyway, I’m getting one nullpointerException just that I have no idea how to deal with it, I took a look on the net about and apparently the problem is in uninitiated variables and things like that,…
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answer657
viewsreturn function json object
i have an android function that connects to the server and returns me a json, that json and stored in a variable called object. however I have to make this object go to another screen via Return but…
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answer138
viewsNullpointerexception error in running my program
I am doing an activity with the following statement: You must implement a digital clock in Java. For this, you create three classes, namely: Counter, Clock and other class to test the execution…
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answer124
viewsNullreferenceexception in Winforms code
I believe it’s a bug not the code, but the compiler... When I eat this area of code, the error always goes to the next variable, or method. Behold: Part of the code: grpBoxMDeck[i] = new…
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answers64
viewsNullpointer Exception when using the @Before and @After notations in Selenium
When using the ratings @Before and @After, is giving nullpointer error. Does anyone know what it is? Follows the code: import org.junit.After; import org.junit.Assert; import org.junit.Before;…
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votes4
answers1449
viewsUndefined object reference for an object instance in array
I have a problem. I have to make a video rental program in which you say the data of 5 movies, and then the program lists all the information! And it is mandatory to make a class for this! I’ve done…
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answers1938
viewsGET service - System.Nullreferenceexception: 'Object Reference not set to an instance of an Object. '
I am acting in the creation of a service Get in ASP.NET Core, my project contains the following structure: Certidao.Data - Class Library Inside there is Dependences, Models: Sexo.cs and…
c# .net entity-framework asp.net-core nullpointerexceptionasked 6 years, 5 months ago Leandro Azevedo 303 -
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answer279
viewsError handling exceptions - "Undefined object reference for an instance of an object"
public String IdentificarAcessoDAL(FuncionarioDTO acesso) { try { conexao.cmd.Connection = conexao.conexao; string recuperar = "SELECT CARGO.NOME_CARGO FROM LOGIN INNER JOIN FUNCIONARIO ON…
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answers54
viewsProblem in crossing parameters between screens in Javafx
Friends, this is my main start method of a Javafx project. The idea was for me to store a cache of all the screens so that I could pass objects between the screens through the Observer Pattern. The…
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answers56
viewsByte[] to image conversion returning null
I am developing a mobile application that send photos of the application to the server, made in springboot. When receiving the request with the image, via json, I try to convert String to Image.…
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answer1314
viewsjava.lang.Nullpointerexception on chat system
I am doing a chat project Helpdesk with JSF 2.0 and Primefaces, but an error is generated when I try to connect the Attendant or user in chat. In atendente.xhtml and index.xhtml has a form that…
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answers80
viewsPointer error in a table fill method
Apparently it is to be right, but when I run the following errors: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at bibl.PesquisaSimpl.preencheTabela(PesquisaSimpl.java:188)…