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Questions - nullpointerexception

How to properly reference a class which extends from View in MainActivity?

I'm learning by doing and reading from the Android docs but I have stumbled upon this problem while building a drawing app. public class MainActivity extends AppCompatActivity { private Button co...
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BadProgrammer

android

oop

nullpointerexception

Votes: 0

Answers: 0

Getting the error "Exception in thread "main" java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because "location" is null

I have tried many ways but the error still persists. This error is shown because the location of the image is null but I think there are some more issues that causes this error I am attaching my code ...
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Sourabh Sharma

java

eclipse

swing

nullpointerexception

embedded-resource

Votes: 0

Answers: 0

App Crashing when calling New Activity Intent from Webview?

I'm developing app to load PDF file into new PDF activity from Webview using intent & PdfViewer.jar library. I know it is not possible to open PDF files in Webview but trying to open in activity_p...
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abhilash kaveriappa

android

android-studio

android-intent

webview

nullpointerexception

Votes: 0

Answers: 4

Latest Answer

From where you getting the uri. It clearly show that uri is null means have no value. if you are getting it from previous activity use this. final Uri uri= getIntent().getStringExtra("name&q...
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Manjeet deswal

NullPointer while using JPA EntityManager in a ThredPoolExecutor

I'm implementing a JavaEE8 application using CDI and running on an Open Liberty (v20.0.0.4). The application has a event-triggered job, which runs some code in an separate thread using the ThreadPoolE...
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cloudy_rowdy

jpa

nullpointerexception

entitymanager

java-ee-8

open-liberty

Votes: 0

Answers: 1

Latest Answer

Enabling the concurrent-1.0 feature alone doesn't do anything unless you are using the managed resources that it provides which capture the context of the application component (such as its java:comp ...
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njr

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