Most viewed questions in Java

0 votes
1 answer

JsonMappingException: No suitable constructor found for type [simple type, class ]: can not instantiate from JSON object?

Hello @kartik, his happens for these reasons: your inner ...READ MORE

Apr 8, 2020 in Java by Niroj
 • 82,880 points • 14,780 views
0 votes
2 answers

How to convert InputStream to byte array in Java?

The class IOUtils, lib: https://mvnrepository.com/artifact/com ...READ MORE

Sep 24, 2020 in Java by Anthony
 • 14,761 views
+1 vote
1 answer

How to tell the Maven to use the latest version of dependency in Java?

If you always want to use the ...READ MORE

Jun 26, 2018 in Java by Sushmita
 • 6,910 points • 14,753 views
0 votes
2 answers

Include all the jars in a directory within the Java classpath

Just use lib/*   not lib/*.jar   That's the ...READ MORE

Apr 6, 2019 in Java by anonymous
 • 14,366 views
0 votes
1 answer

Autowired field pointing NULL in Spring

The field annotated @Autowired is null because ...READ MORE

Jun 6, 2018 in Java by Avi
 • 160 points
edited Mar 4, 2022 by Sarfaraz • 14,223 views
0 votes
2 answers

How to round a double to 2 decimal places?

double value = 200.3456; System.out.printf("Value: %.2f", value); You can ...READ MORE

Dec 11, 2018 in Java by Sushmita
 • 6,910 points • 13,980 views
0 votes
1 answer

How to set base url for rest in spring boot?

Hello @kartik, Set it up in your application.yml ...READ MORE

May 22, 2020 in Java by Niroj
 • 82,880 points • 13,870 views
+1 vote
2 answers

Non-static variable cannot be referenced from a static context. Explain?

class Program { int count ...READ MORE

Sep 28, 2019 in Java by anonymous
 • 13,669 views
+2 votes
3 answers

Listing all the subclasses of a specific class in Java

Try with BurningWave core library. Here an ...READ MORE

Dec 29, 2019 in Java by anonymous
 • 460 points
edited Jan 9, 2020 by anonymous • 13,121 views
0 votes
1 answer

Interface variable are static and final by default. Why?

Interface variables are static because Java interfaces ...READ MORE

Jul 4, 2018 in Java by Daisy
 • 8,120 points • 12,705 views
+1 vote
2 answers

Java: Nested Methods

public class ObjClass {     ObjClass anyMethod() ...READ MORE

Jan 19, 2020 in Java by zemiak
 • 12,636 views
0 votes
1 answer

Execution Failed for task :app:compileDebugJavaWithJavac in Android Studio

In Android Studio 3.1, you can see ...READ MORE

Feb 17, 2022 in Java by Aditya
 • 7,680 points • 12,612 views
0 votes
1 answer

Static Map initialization in Java

I would suggest you to use the ...READ MORE

May 4, 2018 in Java by Akrati
 • 3,190 points • 12,484 views
0 votes
2 answers

How do I get the size of a java.sql.ResultSet?

You could probably do rows-count. ResultSet rs = ...READ MORE

Aug 22, 2019 in Java by Sirajul
 • 59,230 points • 12,410 views
0 votes
2 answers

In Java, what is the best way to determine the size of an object?

I happened to find a java class "jdk.nashorn.internal.ir.debug.ObjectSizeCalculator", ...READ MORE

Aug 19, 2019 in Java by Sirajul
 • 59,230 points • 12,323 views
0 votes
1 answer

Integrate UTF-8 encoding in Java WebApp

Mostly characters äåö are not a problematic ...READ MORE

Dec 12, 2018 in Java by Sushmita
 • 6,910 points • 12,287 views
0 votes
1 answer

Error:java.lang.OutOfMemoryError: Java heap space in Maven

Hello @kartik, Here is the whole config that ...READ MORE

Jun 3, 2020 in Java by Niroj
 • 82,880 points • 12,143 views
0 votes
1 answer

Switch JPanels inside a JFrame

Instead of trying to add an remove ...READ MORE

Feb 14, 2019 in Java by developer_1
 • 3,320 points • 12,119 views
0 votes
1 answer

Configuration metadata in Spring Framework

Configuration metadata can be provided to Spring container in ...READ MORE

Aug 3, 2018 in Java by code.reaper12
 • 3,500 points • 12,085 views
0 votes
1 answer

How to get comments by given user in Facebook Graph API? Can we get list of comments made by given user?

Hii kartik, You can get the list of ...READ MORE

May 7, 2020 in Java by Niroj
 • 82,880 points • 12,064 views
0 votes
2 answers

How to ignore exception in Java?

There is no way to basically ignore a ...READ MORE

Aug 16, 2019 in Java by Sirajul
 • 59,230 points • 11,975 views
0 votes
1 answer

@Component vs @Controller vs @Repository vs @Service annotations in Spring Framework

@Component: This marks a java class as a bean. ...READ MORE

Nov 28, 2018 in Java by code.reaper12
 • 3,500 points • 11,948 views
0 votes
3 answers

How can I add new elements to an Array in Java

String[] source = new String[] { "a", ...READ MORE

Sep 19, 2018 in Java by Sushmita
 • 6,910 points • 11,659 views
0 votes
1 answer

Unrecognized SSL message, plaintext connection? Exception

It is due to the fact that ...READ MORE

Feb 22, 2022 in Java by Aditya
 • 7,680 points • 11,397 views
0 votes
1 answer

What is the difference between Polymorphism, Overriding and Overloading?

As far as I know, the main ...READ MORE

Jun 19, 2018 in Java by scarlett
 • 1,290 points • 11,347 views
0 votes
2 answers

How do we convert only the second letter of every word in a string to uppercase ?

The following code will perform your desired ...READ MORE

Aug 29, 2018 in Java by curious
 • 560 points • 11,309 views
0 votes
1 answer

How to set margins in a LinearLayout programmatically?

LinearLayout ll = new LinearLayout(this); ll.setOrientation(LinearLayout.VERTICAL); LinearLayout.LayoutParams layoutParams = ...READ MORE

Dec 20, 2018 in Java by Daisy
 • 8,120 points • 11,260 views
0 votes
1 answer

What is Eclipse Clean Mode ?

What it does: if set to "true", any ...READ MORE

Jan 11, 2019 in Java by developer_1
 • 3,320 points • 11,180 views
0 votes
1 answer

DTO vs VO vs POJO vs JavaBeans

Data Transfer Object is used for transferring a collection ...READ MORE

Aug 14, 2018 in Java by code.reaper12
 • 3,500 points
edited Oct 7, 2021 by Sarfaraz • 11,134 views
0 votes
1 answer

Trusting all certificates using HttpClient over HTTPS

Note: Do not implement this in production ...READ MORE

Jun 25, 2018 in Java by Rishabh
 • 3,620 points • 11,021 views
0 votes
2 answers

How can we add an image to a JPanel?

If you are using JPanels, then are ...READ MORE

Sep 20, 2018 in Java by Daisy
 • 8,120 points • 10,992 views
0 votes
1 answer

How to resolve the error: could not find or load main class?

If you are getting error: could not ...READ MORE

May 28, 2018 in Java by Parth
 • 4,630 points • 10,880 views
0 votes
1 answer

window.location.href and window.open () methods in JavaScript

To answer your question, first of all, ...READ MORE

Feb 9, 2022 in Java by Rahul
 • 9,670 points • 10,859 views
0 votes
1 answer

Is there a way to mask the password from java user input that comes from Scanner class and System.out.Println()?

You can use the console class to do so. ...READ MORE

May 27, 2019 in Java by Omkar
 • 69,210 points • 10,742 views
0 votes
1 answer

3DES encryption/decryption in Java

Hey, its just that Base 64 encoding ...READ MORE

Nov 8, 2018 in Java by nirvana
 • 3,130 points • 10,675 views
0 votes
1 answer

What is a serialVersionUID and why should we use it?

Hello @kartik, SerialVersionUID is a unique identifier for each ...READ MORE

May 28, 2020 in Java by Niroj
 • 82,880 points • 10,592 views
0 votes
2 answers

How can we add the local JAR files to the Maven Project in Java?

Firstly I would like to give credit ...READ MORE

Nov 5, 2018 in Java by Sushmita
 • 6,910 points • 10,402 views
0 votes
1 answer

Retrieving the path of a running jar file

Its quite simple. Try using the below ...READ MORE

May 25, 2018 in Java by geek.erkami
 • 2,680 points • 10,354 views
0 votes
1 answer

revalidate() vs repaint() in Java Swing

You need to call repaint() and revalidate() both in order ...READ MORE

Sep 20, 2018 in Java by code.reaper12
 • 3,500 points • 10,258 views
0 votes
1 answer

Accessing Json array with Java

An org.json.JSONArray is not iterable. Here's how I process elements ...READ MORE

Jan 22, 2019 in Java by developer_1
 • 3,320 points • 10,091 views
+2 votes
10 answers

Convert Java Byte Array - String - Byte Array

Character Stream Vs Byte Stream Character oriented are ...READ MORE

Sep 25, 2018 in Java by carldivin
 • 180 points • 9,884 views
0 votes
1 answer

How do I implement a HttpURLConnection using a Proxy ?

Since java 1.5 you can also pass ...READ MORE

Dec 10, 2018 in Java by Sushmita
 • 6,910 points • 9,857 views
0 votes
1 answer

Arrays are passed by value or passed by reference in Java?

Arrays are not a primitive type in ...READ MORE

Jul 18, 2018 in Java by sophia
 • 1,400 points • 9,730 views
0 votes
1 answer

The specified child already has a parent. You must call removeView() on the child's parent first (Android)

The error message says what You should ...READ MORE

Feb 16, 2022 in Java by Aditya
 • 7,680 points • 9,714 views
+2 votes
2 answers

How to connect to Oracle using Service Name instead of SID?

HII.. I hope this information may help you- Thin-style ...READ MORE

Sep 29, 2020 in Java by SRI
 • 9,644 views
0 votes
1 answer

Play MP3 files usng Java API

I don't believe the java AudioStream class ...READ MORE

May 10, 2018 in Java by Rishabh
 • 3,620 points • 9,265 views
0 votes
1 answer

Converting ISO 8601-compliant String to java.util.Date

Unfortunately, the time zone formats available to SimpleDateFormat (Java ...READ MORE

Nov 27, 2018 in Java by Daisy
 • 8,120 points
edited Oct 7, 2021 by Sarfaraz • 9,262 views
+1 vote
1 answer

Convert CSV to JSON. JSON payload should be included in square brackets

The JSON payload uses a list and ...READ MORE

Aug 7, 2018 in Java by Omkar
 • 69,210 points • 9,261 views
0 votes
1 answer

IllegalArgumentException: navigation destination xxx is unknown to this NavController

Hello @kartik, Check currentDestination before calling navigate might be helpful. For ...READ MORE

May 26, 2020 in Java by Niroj
 • 82,880 points • 9,168 views
0 votes
1 answer

Logger cannot be resolved Java(570425394) Error occured

Hey, @Boopathy, Could you please post your code ...READ MORE

Dec 1, 2020 in Java by Gitika
 • 65,910 points • 8,878 views
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