Error in java

Question

I was trying to run a java program with terminal then I faced an error. Java compilation was competed but the problem occurred when I executed `java prog` (prog is the name of my file).

Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: prog has been compiled by a more recent version of the Java Runtime (class file version 56.0), this version of the Java Runtime only recognizes class file versions up to 52.0

Error was lot more big but due to word limit I am unable to give it full.

My java compiler version - 12.0.1
My java version -

java version "1.8.0_281"
Java(TM) SE Runtime Environment (build 1.8.0_281-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.281-b09, mixed mode)

My complete error >
https://code.sololearn.com/cS0lM7l2YE91/?ref=app

Answer 1

https://docs.oracle.com/javase/tutorial/getStarted/problems/index.html

Read it, this will be helpful for you!

NOTE - Name of file and name of class must be same,

$ javac helloWorld.java
$ java helloWorld.class
hello world

CODE -

public class helloWorld {
public static void main(String[] args) {
System.out.print("hello world");
}}

Answer 2

Can you please share that program?

Answer 3

Thanks Atul for correcting me

Answer 4

https://ibb.co/MRPJb4T

my error

import java.io.*;
public class prog {
public static void main(String args[]){
System.out.println("Hello World");
}
}

and yeah I am doing java prog

I get this error by doing java prog.class
Error: Could not find or load main class prog.class

Answer 5

Avinesh Bhai, is correct Krish [less active] ,Java is a compiled language first you have to compile it and after compilation a .class file will be created you have run that class file by writing 'java filename.class' , in terminal.
You can take help of YouTube or Google for see it in video.

Answer 6

Solution of JNI Error

https://youtu.be/zV4_9O_GoNM

https://webdeasy.de/en/error-a-jni-error-has-occured-how-to-fix-this-java-error/

The problem occurs because your JRE (Java Runtime Enviroment) and your JDK (Java Development Kit) are not working together correctly. Usually the problem occurs when you want to call a . jar file by comment line, e.g. with the command java -jar File. jar .

see this site and video, I copied a part of para from The site!

All the best!

Answer 7

Atul It's hello world

I was first time using terminal to run java so I first tested it with hello world

Answer 8

Krish [less active] you were using sololearn or any other JDK?

Answer 9

Rishav Tiwari I think so you have missed out String args[]

Answer 10

Rishav Tiwari My pleasure

Answer 11

Krish [less active] have you read that site!

Please post the image of your code!

And image of terminal too! So it will be easy to justify error

Answer 12

NOTE - 1) Give space after string
2) first compile your program, by writing

$ javac filename.java

After compling a class file will be created , and type

$ java filename.class

Don't forget to give extension of .class while running!

Answer 13

Basically your program is coming under runtime errors.

Answer 14

Atul i don't have anything in my program how would I get runtime error?

Answer 15

You must compile your code first
javac prog.java

To execute
java prog

Answer 16

Rishav Tiwari and Avinesh

I executed

> javac prog.java
> java prog

Answer 17

Rishav Tiwari
> java prog.class

Gives an error which is could not find or load main class prog.class

And also in web tutorials it says not to add class extension

Answer 18

Krish [less active] , bro please send me what you are doing from starting to end as a video 🤯 ! If you don't mind

Answer 19

Rishav Tiwari you don't add .class after file name to execute the code. It will not work. I have already mentioned how to execute in my last comment.

Answer 20

Avinesh Oh! My bad! 😅