Eclipse Java application just terminates

Question

I have run this application yesterday and went back to work on it more today and when I try to run it, the terminal acts like it's loading and then it just says Terminated .

I am using Eclipse Neon, Java version 1.8. The only thing that has changed is that I installed Comodo firewall, but to ensure this wasn't the cause, I disabled all protection and have the same result. I'm the only one working on this project so nobody else has added anything that would cause a crash, there is no error message or exception anyway.

I've right clicked on the main class, Run as ->Java Application and no luck.

package default_package;
import java.io.File;
import java.io.IOException;

import javax.swing.JOptionPane;

import org.apache.log4j.Logger;

public class main
{
  public main() {}

  public static void main(String[] args) throws Exception
  {

    final Logger logger = Logger.getLogger(main.class);
    logger.info("Application starting");
    if (isFirstRun()) {
        logger.info("Preparing for first run");
        if (setupSumFile()) {
            JOptionPane.showMessageDialog(null,"An unknown error has occured setting up the application for first time use");
            logger.error("Unknown error in main");
            return;
        }
    }
    window w = new window();
  }
  private static boolean isFirstRun() {
      return !(new File("sums.info").exists());
  }
  private static boolean setupSumFile() throws Exception {
      File sumFile = new File("sums.info");
      if(!sumFile.exists()) {
          sumFile.createNewFile();
      }
      return isFirstRun();
  }
}

Not even the logger message about the application is getting run.

Edit: Under a suggestion, I tried to run the application in debug mode. While nothing happened and the program instantly terminated, I was able to recieve this error:

Cannot connect to VM: Socket operation on nonsocket: configureBlocking

Answer 1

Please learn about the keywords of the Java. You cannot use those keywords in Class name, variables, method name, etc.