Editor does not contain a main type in Eclipse

Question

I downloaded eclipse-jee-kepler-SR1-linux-gtk-x86_64.tar.gz. This eclipse is built-in with java and my Lubuntu is 64-bit. Whenever I compile and run a simple code in java like this one below:

public class Sample{

   public static void main(String[] args){
       System.out.println("YOLO");
   }
}

I always get an Editor does not contain a main type. I put the file in a project folder called Sample. This eclipse should compile java code because its an IDE distribution specialized for java.

How can i resolve this error?

Any help would be much appreciated.

Here's my project structure: enter image description here

Did you try cleaning and building your project?. Show us your project structure from eclipse. — TheLostMind, Jun 09 '14 at 09:55
Put screen shot of **marks** window in your question. Because you have to consider about exclamation mark in view. — Cyclops, Jun 09 '14 at 10:02
thank you to all who replied. It suddenly worked. I don't know how but I restarted, cleaned and created new project and created file inside src folder. Thanks! — ThisGuy, Jun 09 '14 at 10:47
https://www.youtube.com/watch?v=hrS_uvswsnk refer this link for error resolvement . — Ritik Kamboj, Apr 15 '22 at 07:47

score 64 · Answer 1 · answered Apr 29 '18 at 13:19

64

Problem is that your folder is not identified as a Source folder.

Right click on the project folder -> Properties
Choose 'Java Build Path'
Click on 'Sources' tab on top
Click on 'Add Folder' on the right panel
Select your folders and apply

answered Apr 29 '18 at 13:19

Ramraj

2,040
14
17

3

This answer helped me realize that I had created my project as new General Project instead of new Java Project. – Noumenon Mar 12 '19 at 19:25
I tried this, but getting same error. I also clean and build the solution. – Upendra Gughane Jun 24 '19 at 12:27
5

I have moved the code to src folder and it worked. – Upendra Gughane Jun 24 '19 at 12:42
1

The only thing that helped is to move the .java file to src folder. – sipi09 Sep 06 '22 at 22:36
Also if all these does not help , try restarting your IDE. In my case it helped me. – Ripudaman Singh Mar 18 '23 at 18:58

score 16 · Answer 2 · answered Mar 23 '15 at 05:16

16

I just had this exact same problem. This will sound crazy but if someone sees this try this before drastic measures. delete method signature:

public static void main(String args[])

(Not the body of your main just method declaration)

Save your project then re-write the method's header back onto its respective body. Save again and re-run. That worked for me but if it doesn't work try again but clean project right before re-running.

I don't know how this fixed it but it did. Worth a shot before recreating your whole project right?

answered Mar 23 '15 at 05:16

NekoKikoushi

496
5
16

1

This also seemed to have solved my imports not showing as an auto-import option issue... odd – NekoKikoushi Mar 23 '15 at 05:19
1

This solved My problem too .. I just went a step ahead, added a space and then removed it. Saved and ran. – Akshay Joshi May 06 '21 at 11:40

Ninad Pingale · Answer 3 · 2014-06-09T10:03:09.993

14

Right click your project > Run As > Run Configuration... > Java Application (in left side panel) - double click on it. That will create new configuration. click on search button under Main Class section and select your main class from it.

edited Jun 09 '14 at 10:03

answered Jun 09 '14 at 09:57

Ninad Pingale

6,801
5
32
55

1

It helped me alot. But during the course of fixing it i faced challange of selecting main Class. Inbuilt search didn't work properly. So I entered main class location in Main.class section in Run configuration page. – Anup Prakash Oct 07 '20 at 10:19

score 14 · Answer 4 · answered Jun 09 '14 at 10:18

14

I suspect the problem is that Sample.java should be in a package inside the src folder.

I guess that eclipse will not automatically look outside of there.

answered Jun 09 '14 at 10:18

phil_20686

4,000
21
38

If you are not in a place to change the package, try marking the current package under sources. Check: https://stackoverflow.com/a/50087008/3604656 – Ramraj Apr 29 '18 at 13:23

score 6 · Answer 5 · answered Jun 13 '18 at 19:37

6

First look for the main method is there or not.If it is there, do restart your eclipse and right click on the page which having main method, Go to run as Java application.

answered Jun 13 '18 at 19:37

Sudhir Gaurav

107
1
4

score 2 · Answer 6 · edited May 23 '17 at 12:02

2

Make sure you do Run As > Java Application.

If not you could try a Project > Clean

Some more questions that deals with this that could be helpful, Refer this

edited May 23 '17 at 12:02

Community

1
1

answered Jun 09 '14 at 10:15

Cyclops

649
3
8
33

score 1 · Answer 7 · answered Feb 10 '15 at 09:41

1

Create a source folder under Java Resources enter image description here

answered Feb 10 '15 at 09:41

sarath

767
12
19

Siva Srinivas · Answer 8 · 2018-05-15T17:52:41.820

1

For me, classpath entry in .classpath file isn't pointing to the right location. After modifying it to <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/> fixed the issue

edited May 15 '18 at 17:52

answered May 15 '18 at 17:47

Siva Srinivas

11
3

score 0 · Answer 9 · edited Aug 01 '17 at 06:09

0

Ideally, the source code file should go within the src/default package even if you haven't provided any package name. For some reason, the source file might be outside src folder. Create within the scr folder it will work!

edited Aug 01 '17 at 06:09

Manfred Radlwimmer

13,257
13
53
62

answered Aug 01 '17 at 05:48

Shiyas Cholamukhath

669
5
9

score 0 · Answer 10 · edited Oct 06 '17 at 04:55

0

Right click on Sample.java file and delete it. Now go to File -> New -> Class , enter name of program (i.e. hello) , click on finish . It will create file hello.java. Enter source code of program and finallly press ctrl + F11

edited Oct 06 '17 at 04:55

Stephen Rauch

47,830
31
106
135

answered Oct 06 '17 at 04:37

Pavan Yogi

180
2
7

score 0 · Answer 11 · answered Mar 03 '18 at 21:37

0

Right click on your project, select New -> Source Folder

Enter src as Folder name, then click finish.

Eclipse will then recognize the src folder as containing Java code, and you should be able to set up a run configuration

answered Mar 03 '18 at 21:37

Brendan Cody-Kenny

434
4
10

score -1 · Answer 12 · answered Aug 05 '17 at 21:54

-1

I had the same issue. I had accidentally deleted the .classpath and .project file in my workspace. Luckily it was in Recycle bin, as soon as it was restored, there were no issues.

answered Aug 05 '17 at 21:54

Pradeep AR

1

score -6 · Answer 13 · answered Dec 31 '17 at 07:31

-6

Just change "String[] args" to "String args[]".

answered Dec 31 '17 at 07:31

Sonu Mishra

25
2

Editor does not contain a main type in Eclipse

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