score:-8

if your package name is same with your class name this problem will occur.

score:2

this happened to me. i noticed that someone said i have to create an entire new workshop! why? because i installed a newer jre version and that won't allow other previous versions to run on it. so all those old files i have become useless in a way. not really, just copy and paste it to new class and change it to an unused class name.

score:4

that's because you guys created the class one time with the main method & after that may be you have been deleted that form or workplace & still some of the files exist ,i will suggest you to create that form or workspace again & then delete it by clicking on it completely,then after that if you created the some class like runner class try to run it again.

score:14

same problem occur with me.i went to project > properties > java buildpath.

there in order of export , i moved up my java/main to the top priority.

score:22

it seems that the class is not compiled by eclipse.

few pointers could be-

  1. check if the .class file exists in your output folder.to know your output folder right click on project->properties->java build path(check at bottom).
  2. check if project->build automatically is checked in the menu.
  3. check if the helloworld class is in src folder or not.right click on project->properties->java build path(check source tab).

score:44

i deleted a jar file from the bin directory. right click on your project - properties then libraries tab. there was a red flag in there. i removed the jar file from the libraries and it worked.

score:98

i just ran into that problem. the cause... not sure. however, only happened after i added a new jvm. my solution:

  • went to run configurations: - run->run configurations

in the classpath tab:

  • select advanced
  • add where eclipse usually put the *.class for the projects, which is in bin. so i added the bin directory for the project.

i hope it helps someone out there. it took me time to figure this out.

score:109

this just happened to me today after updating my jre. i cleaned the project and it started working again.

project -> clean will remove any existing class files and completely rebuild the project. there's more information on eclipse's clean function here.


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