Please help - Is this error due to incompatible jdk ?

Question about the task

Under discussion

C:\Users\gangi\.jdks\openjdk-25.0.1\bin\java.exe -Dfile.encoding=UTF-8 "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2025.2.5\lib\idea_rt.jar=52237" -Dsun.stdout.encoding=UTF-8 -Dsun.stderr.encoding=UTF-8 -classpath C:\Users\gangi\Downloads\codegym\11531669\codegym-project\out\production\codegym-project en.codegym.task.jdk13.task07.task0712.Solution Error: Could not find or load main class en.codegym.task.jdk13.task07.task0712.Solution Caused by: java.lang.ClassNotFoundException: en.codegym.task.jdk13.task07.task0712.Solution

Initialize the strings field in the main method.
Add 10 strings from the keyboard to the strings list.
Determine whether the shortest string or the longest string is encountered first in the list. If several strings are shortest or longest, then consider the very first such string encountered.
Display the string described in Step 3. One string should be displayed.

Requirements:

The List<Strings> strings field must be initialized in the main method.
The program should read 10 strings from the keyboard and add them to the list.
The program should display the shortest string if it comes before the longest.
The program should display the longest string if it comes before the shortest.
Only one string should be displayed.

package en.codegym.task.jdk13.task07.task0712; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.ArrayList; /* Minimum or maximum */ public class Solution { public static ArrayList<String> strings; public static void main(String[] args) throws IOException { strings = new ArrayList<>(); BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); for (int i = 0; i < 10; i++) { String string = reader.readLine(); strings.add(string); } String minSizeElement = strings.get(0); int posMinElement = 0; String maxSizeElement = strings.get(0); int posMaxElement = 0; for (int i = 0; i < 10; i++) { if (strings.get(i).length() < minSizeElement.length()) { minSizeElement = strings.get(i); posMinElement = i; } else if (strings.get(i).length() > maxSizeElement.length()) { maxSizeElement = strings.get(i); posMaxElement = i; } } if (posMinElement < posMaxElement) { System.out.println(minSizeElement); } else { System.out.println(maxSizeElement); } } }

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Thomas

Level 41 , Bayreuth, Germany

23 December 2025, 06:53

I doubt that this is a Java version issue. You could first try to rebuild your project and, if that does not help, delete and recreate your intellij run profile. For the later exercises you may also want to restrict Java language level inside IntelliJ so that you can not use commands Codgym does not understand. That's problems that are hard to find.