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Can't get started (HelloWorld tutorial) [message #1866057]

Tue, 21 May 2024 03:52

Maple Syruper

Messages: 2
Registered: May 2024

Junior Member

I'm totally new to Java and Eclipse, but trying to help my kids with a beginner Java course. We installed the latest version of Eclipse (May 20, 2024), and followed the Hello World tutorial that came up, but we're getting an error we don't understand. Here is my program and the error, but see attached screenshots also.

public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello world!");
}
}

Error: Could not find or load main class test2.Test2
Caused by: java.lang.ClassNotFoundException: test2.Test2

There was originally a module-type thing showing up under HelloWorld, but I right-click-deleted it based on reading some other posts here, but it didn't help.

The funny thing is, I tried 3 different computers. This error is from a PC with Windows 10. I got the same error on a PC with Windows 7. But on a different PC with Windows 10 the same program ran fine .

Thank you!

Attachment: TryingToRun.PNG
(Size: 48.31KB, Downloaded 49 times)
Attachment: ErrorAfterRunning.PNG
(Size: 78.16KB, Downloaded 58 times)

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Re: Can't get started (HelloWorld tutorial) [message #1866132 is a reply to message #1866057]

Tue, 21 May 2024 22:51

Maple Syruper

Messages: 2
Registered: May 2024

Junior Member

Here's more info. I reinstalled Eclipse and started over from the beginning of the HelloWorld tutorial. I'm still getting the same error; see attached image.

There are red x's next to lines 1,2,4, and 5. They are hard to capture with a snip, but here's what they say:

X on line 1:
Multiple markers at this line
- The type java.lang.String cannot be resolved. It is indirectly referenced from required .class files
- Must declare a named package because this compilation unit is associated to the named module 'HelloWorld'
- The type java.lang.Object cannot be resolved. It is indirectly referenced from required .class files

X on line 2:
Implicit super constructor Object() is undefined for default constructor. Must define an explicit constructor

X on line 4;
String cannot be resolved to a type

X on line 5:
System cannot be resolved

Attachment: Error on second day.PNG
(Size: 105.61KB, Downloaded 34 times)

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Re: Can't get started (HelloWorld tutorial) [message #1866195 is a reply to message #1866132]

Wed, 22 May 2024 14:40

Ed Merks

Messages: 33264
Registered: July 2009

Senior Member

You cannot define a class without a package in a project with a module because Java doesn't allow modules to contain unnamed packages. You must delete the module-info.java or create the class with a package.

Ed Merks
Professional Support: https://www.macromodeling.com/

[Updated on: Wed, 22 May 2024 14:44]

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