Netbeans - Error Could not find or load main class

Question

So I m making a java application in Neatbeans 7 4  been working at it for a while  everything was fine  running the project worked fine  but now when I hit run project  I get the error   Error  Could not find or load main class phleveledit MainWindow Java Result  1 BUILD SUCCESSFUL  total time  0 seconds    I can t think of what I did right before this started happening  so I don t know what I should change   The code doesn t appear to have any errors  Here s a screenshot of the IDE project folder  Image  http   puu sh 5ldYB       Any ideas   Edit  Unfortunately I happened to fix this problem by removing some code  which probably had some errors Netbeans couldn t detect  but I don t know what was exactly wrong so can t vote on a correct answer

User · Answer

You can     RightClick on project node and go to Set configuration Select the main class for your application  Then clean and build    Even if the above steps don t work for you then then delete the Netbeans cache by deleting the  index  folder  User  netbeans SOME NUMBER reflecting your version var cache index

User · Answer

You can solve it in these steps   Right-click on the project in the left toolbar  Click on properties  Click on Run Click the browse button on the right side  select your main class  Click ok

User · Answer

I had the same issue once  The problem was not in the code  The cause was    renaming the project folder to some other non supporting name  My project name was  MobStick  and I renamed it to  MobStick - May 26  2014 04 00PM   Renaming it back to normal solved my problem

User · Answer

Possible Fixes  Fix 1  Go to project properties  right click on the folder of your project in netbeans  On left tab where it shows the categories  click on the  quot Run quot  selection Then click on Browse to find the Main class you use on your project  Fix 2  Go to C  Users name AppData Local Netbeans delete the Cache folder  Rebuild and Run  Fix 3 Download most recent version of Netbeans Fix 4 Download most recent version of JDK and configure Netbeans to use that

User · Answer

I have run into this error a couple of times as well and for me the above solutions did not work  What does seem to work is going to the Project Properties  and under Compiling toggling Compile on Save

User · Answer

Sometimes due to out of memory space error  NetBeans does not load or find main class   If you have tried setting the properties and still it is not working then try   Select the project from the project explorer Click on Run in the Menu Bar Click on Compile   It worked for me

User · Answer

I just ran into this problem  I was running my source from the command line and kept getting the same error  It turns out that I needed to remove the package name from my source code and then the command line compiler was happy   The solutions above didn t work for me so maybe this will work for someone else with a similar problem

User · Answer

Using NetBeans 8 1  I got the dread   Error  Could not find or load main class    from carelessly leaving an empty line in the Project Properties  gt  Run  gt  VM Options field  Until you click in the field  you may not see the caret flashing out of place  Remove the empty line to restore equanimity

User · Answer

Just close the Netbeans  Go to C  Users YOUR PC NAME AppData Local Netbeans and delete the Cache folder  The open the Netbeans again and run the project  It works like magic for me    AppData folder might be hidden probably  if so  you need to make it appear in Folder Options

User · Answer

This condition happens to me every 6-months or so  I think it happens when closing NetBeans under very low memory conditions  I discovered that it could be easily corrected by  1  Rename your project  including its folder name using right-click on project explorer s project name---I put a simple suffix on the original name    damaged     2  Try BUILD  If that is successful  which it is for me  give three cheers   3  Repeat step  1  to restore the original project name  BUILD and RUN should start without trouble  I guess that the  rename the project and folder  process causes a special rediscovery of the applications main location

User · Answer

If none of the above works  Setting Main class  Clean and Build  deleting the cache  and you have a Maven project  try   mvn clean install   on the command line

User · Answer

close netbeans  open netbeans again  choose new project  java application   click next  deselect create main class  now make the application clean build run   For more reference watch this video

User · Answer

Right click on your Project in the project explorer Click on properties Click on Run Make sure your Main Class is the one you want to be the entry point   Make sure to use the fully qualified name i e  mypackage MyClass  Click OK  Clean an build your project Run Project      If you just want to run the file  right click on the class from the package explorer  and click Run File  or  Alt   R  F   or  Shift   F6

User · Answer

if you are on window os  then try to start NetBeans via administrative mode  right click on NetBeans icon and  Run as Administrative

User · Answer

Try to rename the package name and the class jframe names    The clean and build the application    Right Click on the package name Go to Refactor Select Rename Give it a meaningful name  preferably all in small letters Click on Refactor  Do the same for the class jframe names  Last Select Run from Menu 7 Select Clean and build main project   That should do it    All best

User · Answer

I had the same problem and I moved the project to a location where the path had no none-english letter and that fixed the problem

User · Answer

I had the same problem  I had the package and class named the same  I renamed the class  then clean and build   Then I set the main class in the  run  under the properties of the project  I works now

User · Answer

try this it work out for me perfectly go to project and right click on your java file at the right corner  go to properties  go to run  go to browse  and then  select Main class   now you can run your program again

User · Answer

I found the following steps useful    Right-click on the project in the left toolbar  Hover over the  Set Configuration  item  Click on  Customize     Click on  Browse     by the  Main Class   item  Select the correct class  Click  Select Main Class   Click  OK     My problem was that  apparently  my package name was being listed twice   Selecting the class using the dialog changed  aclass MainClass  to just  MainClass    Hope this helps   -HewwoCraziness  Edit   This is expanding on Mary Martinez s answer

User · Answer

Had the same problem here  Usually Clean and Build solves much of the problem  It happened to be caused by a wrongly installed plugin

User · Answer

I faced the similar issue with Netbeans 10 and JDK 1 8  I was not able to choose the right class to launch the project When I compile or run the project  it shows me the Class name as  initializing view  please wait       I could not select the class name  The issue was resolved with the NetBeans11 3  I am able to choose the correct Class file without any other changes  and the project is launched without any issues

[java] Netbeans - Error: Could not find or load main class

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