nullpointerexception Questions
4
Solved
i'm got an error:
spray.json.ProductFormats$class.productElement2Field NullPointerException
Here is my code for json deserialisation:
object DomainJsonProtocol extends DefaultJsonProtocol {
im...
Insolate asked 9/2, 2014 at 18:29
4
Solved
I'm trying to get list of images from a folder using this function
var gpath:String = Environment.getExternalStorageDirectory().absolutePath
var spath = "testfolder"
var fullpath = File(gpath + Fi...
Broncho asked 4/7, 2018 at 7:51
2
I have two separated Selenium Webdriver's classes. The class I made first runs without any error but the second class throws the NullPointerException.
The error points out the bellow line WebDrive...
Gaming asked 2/10, 2017 at 5:40
11
Solved
Let's say I'd like to perform the following command:
house.getFloor(0).getWall(WEST).getDoor().getDoorknob();
To avoid a NullPointerException, I'd have to do the following if:
if (house != null...
Nkrumah asked 11/8, 2010 at 12:55
3
Solved
Consider these enum declarations:
enum Color {
RED(Shape.CIRCLE),
GREEN(Shape.TRIANGLE),
BLUE(Shape.SQUARE);
private final Shape shape;
Color(Shape shape) {
this.shape = shape;
}
Shape g...
Electrokinetic asked 20/1, 2023 at 9:58
11
Solved
I am using butterknife 8.0.1, but a nullpointerexception is appearing.
This line is on my build.grade file:
compile 'com.jakewharton:butterknife:8.0.1'
this is my Main Class: (I wrote the inclu...
Subirrigate asked 3/5, 2016 at 20:19
7
Solved
I allways get this java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.content.Context.getApplicationContext()' on a null object reference
error while ...
Nash asked 24/6, 2016 at 13:30
4
Solved
For example for this code:
List<Class> classes =
Stream.of("java.lang.Object", "java.lang.Integer", "java.lang.String")
.map(className -> Class.forName(className))
.collect(Collectors...
Reticulation asked 30/9, 2015 at 4:42
2
I am using spring boot with a DDD application, in which each aggregate root entity has a transient field called events, which are not persisted in database:
@MappedSuperclass
abstract class Aggreg...
Dam asked 16/9, 2019 at 16:3
3
Is there a way to get Intellij to warn me that this may cause a NullPointerException?
URL resource = Main.class.getResource("blah/ha");
System.out.println(resource.getAuthority()); //potential NP...
Catron asked 5/3, 2015 at 2:31
6
Solved
Map<String,Integer> m;
m = new TreeMap<String,Integer>();
Is it good practice to add the following cast just to avoid the null pointer exception when m.get() is null.
System.out.prin...
Lashandralashar asked 8/10, 2014 at 13:57
15
I get a null pointer exception at this row:
public void hideKeyboard(){
InputMethodManager inputManager = (InputMethodManager)
this.getSystemService(Context.INPUT_METHOD_SERVICE);
inputManager...
Folksy asked 28/9, 2013 at 17:2
6
Solved
I've spent the past two hours debugging what seems extremely unlikely. I've stripped the method of a secondary Android Activity to exactly this:
public void onClick(View v) {
String str = "25...
Mur asked 11/9, 2011 at 7:17
0
I'm getting this exception:
Caused by: java.lang.NullPointerException
at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:616) ~[?:1.8.0_302]
at java.util.concurrent.Com...
Pottage asked 22/8, 2022 at 13:24
5
Solved
I'm trying to implement a login feature for my program but it's returning a null pointer exception. I understand that this happens when you refer to a place in memory that has nothing in it, but as...
Renn asked 26/12, 2011 at 19:9
3
I have been having trouble recently with Apache POI's .getCell() method for Excel files. If I try to implement Cell newCell = sheet.getRow(rowNumber).getCell(columnNumber) or something similar, I a...
Aleta asked 2/7, 2015 at 12:18
5
Solved
Is it possible to autoSizeColumns on a streaming SXSSFWorkbook?
I implemented an export functionality to export a list of objects to excel. At first I used the XSSFWorkbook (not streaming) and afte...
Yippee asked 24/1, 2013 at 8:42
7
Solved
I have added an image for my button,but when I run that frame this exception will be thrown .why?please help me.
init:
deps-jar:
compile-single:
run-single:
Exception in thread "AWT-EventQueue-0"...
Aboard asked 7/1, 2010 at 11:33
12
Solved
My android project was compiling well but suddenly it stopped launching. Then I tried to launch other projects from Project Explorer and all project threw same exception:
An internal error occurre...
Ultrafilter asked 15/9, 2014 at 12:3
10
Solved
I want use @Nullable annotation to eliminate NullPointerExceptions.
I found some tutorials on the net, I noticed that this annotation comes from the package javax.annotation.Nullable;
but when I im...
Cystotomy asked 26/9, 2013 at 14:25
1
Solved
Crash as soon as flow emits its first value.
java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object kotlinx.coroutines.flow.FlowCollector.emit(java.lang.Object, kotlin...
Endplay asked 6/4, 2022 at 7:56
1
In my maven based project, String "contextPath" is nothing but any package of my project. No matter what package(or multiple packages appended with :) i assign to contextPath, i still get...
Hardandfast asked 9/3, 2022 at 16:48
5
Solved
I've been searching for this for a while but haven't found any answers, so either I'm missing something so obvious noone has written anything about it, or I've hit an unusual problem. I'm hoping it...
Kirbykirch asked 8/10, 2012 at 9:53
9
Solved
I have an address object that I want to create an equals method for. I could have made this quite simple by doing something like the following (shortened a bit):
public boolean equals(Object obj) ...
Sorrento asked 14/4, 2011 at 10:35
4
Solved
I am a newbie of android world. I have a problem of the coding. It was just a tiny error buy i dont know it doesnt work even i change others method but the error still the same error. Here the erro...
Mckinney asked 10/11, 2015 at 10:30
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