Error Selection does not contain a main type

Question

I am trying to run some java files in a new project  So I make the project  put the files in it and I try to run the main file so my game starts    I get an error that says selection does not contain a main type   I have tried several ways to run it    Some say to launch eclipse again  tried this a dozen times   Somewhere else someone pointed to open a new project and make a build path to the old project     Didn t work either    I am pretty sure it must work because I ran it a few hours ago at school  How do I get this working   Thank you in advance

User · Answer

You must place all your files  file java  under the root folder SRC

User · Answer

Right Click   Run AS   Run Configurations  In this screen if your  Main class  Text field is empty  then add the class name by clicking  Search  button on the right side of the text field and choose the class file  And then click  Run  button on the bottom of the configuration screen  That s it

User · Answer

Make sure the main in public static void main String   args  is lower case  For me it didn t work when I had it with capital letter

User · Answer

When you save your file  make sure it has the extension  java   If it does not  Eclipse won t know to read it as a java file

User · Answer

The other answers are all valid  however  if you are still having a problem you might not have your class inside the src folder in which case Eclipse may not see it as part of the project  This would also invoke the same error message you have seen

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The entry point for Java programs is the method   public static void main String   args          Code     If you do not have this  your program will not run

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Put your Main Java class file in src main java folder and check if there is not any error in  Java Build Path  by following right click on project and select Java Build Path- gt Source

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I had this problem in two projects  Maven and command line worked as expected for both  The problems were Eclipse specific  Two different solutions  Project 1   Move the main method declaration to the top within the class  above all other declarations like fields and constructors  Crazy  but it worked  Project 2   The solution for Project 1  did not remedy the problem  However  removing lombok imports and explicitly writing a getter method solved the problem  Conclusion  Eclipse and or the lombok plugin have has a bug

User · Answer

I ran into the same problem   I fixed by right click on the package -  properties -  Java Build Path -  Add folder  select the folder your code reside in

User · Answer

I resolved this by adding a new source folder and putting my java file inside that folder   source folder  is not just any folder i believe  its some special folder type for java eclipse and can be added in eclipse by right-click on project -  properties -  Java buld path -  Source and add a folder

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I had this issue because the tutorial code I was trying to run wasn t in the correct package even though I had typed in the package name at the top of each class  I right-clicked each class  Refactor and Move To and accepted the package name suggestion  Then as usual  Run As    Java Application  And it worked

User · Answer

Right click on the folder where you put your main class then click on Build Path --  Use as Source Folder   Finally run your main file as java application  Hope this problem will be solved

User · Answer

If you are working with a Maven project you have to understand the fact that directory layout is bit different  In this the package name must be src main java   For this update your source folder by right click on project root folder -  properties -  java build path -  source tab  Here remove all other source folders as they might have been added in wrong manner  Now  select project  src main java as the source folder  Add and apply the changes  Now refresh your workspace using F5   This should fix the issue of not recognizing a main type

User · Answer

I am running eclipse from Ubuntu  Had this same problem and was able run the program through terminal  So I just moved the existing public static void main String   args    just below the class declaration  it got automatically formatted by eclipse  and the next launch was successful  Then moved the main method back to where it was before and it worked fine this time

User · Answer

I hope you are trying to run the main class in this way  see screenshot   If not  then try this way  If yes  then please make sure that your class you are trying to run has a main method  that is  the same method definition as below  public static void main String   args           some code here    I hope this will help you

User · Answer

Few things to check out    Do you have a main package  do all of your classes are under this package  Do you use a main class with public static void main String   args   Do you declare  package   in your main class  You can always clean the project before running it  In Eclipse - Just go to  Project -  clean then run the app again

User · Answer

I ran into the same issue and found that there was an extra pair of braces  curly brackets  enclosing public static void main String args           This method should really be at the top scope in the class and should not be enclosed around braces  It seems that it is possible to end up with braces around this method when working in Eclipse  This could be just one way you can see this issue when working with Eclipse  Happy coding

User · Answer

I had this happen repeatedly after adding images to a project in Eclipse and making them part of the build path   The solution was to right-click on the class containing the main method  and then choose Run As -  Java Application   It seems that when you add a file to the build path  Eclipse automatically assumes that file is where the main method is   By going through the Run As menu instead of just clicking the green Run As button  it allows you to specify the correct entry-point

[java] Error: Selection does not contain a main type

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