Program: 91773
Project: 91773
Buggy source:
private void performCreateVM(String vmName,String boxRef,String vmFile,Map<String,String> environment){
  final Job createVMJob=new Job(DVMessages.getFormattedString(CREATE_VM_MSG)){
    @Override protected IStatus run(    final IProgressMonitor monitor){
      monitor.beginTask(DVMessages.getFormattedString(CRATE_VM_TITLE,vmName),IProgressMonitor.UNKNOWN);
      IVagrantConnection connection=VagrantService.getInstance();
      IVagrantBox box=null;
      File vagrantDir;
      String boxName=boxRef;
      if (vmFile == null) {
        boolean isValidURL=true;
        try {
          new URL(boxRef);
        }
 catch (        MalformedURLException e1) {
          isValidURL=false;
        }
        if (Paths.get(boxRef).toFile().canRead() || isValidURL) {
          try {
            String boxPath=boxRef;
            boxName=boxRef.substring(boxRef.lastIndexOf(File.separator) + 1).replace("String_Node_Str","String_Node_Str");
            connection.addBox(boxName,boxPath,isValidURL);
          }
 catch (          VagrantException e) {
          }
catch (          InterruptedException e) {
          }
        }
        vagrantDir=performInit(vmName,boxName,connection);
        box=findBox(connection,boxName);
        while (box == null && isValidURL) {
          try {
            Thread.sleep(1000);
          }
 catch (          InterruptedException e) {
          }
          connection.getVMs(true);
          box=findBox(connection,boxName);
          if (monitor.isCanceled()) {
            CommandUtils.delete(vagrantDir);
            return Status.CANCEL_STATUS;
          }
        }
      }
 else {
        vagrantDir=Paths.get(vmFile).getParent().toFile();
      }
      EnvironmentsManager.getSingleton().setEnvironment(vagrantDir,environment);
      String provider=(box == null ? null : box.getProvider());
      connection.up(vagrantDir,provider);
      connection.getVMs(true);
      return Status.OK_STATUS;
    }
  }
;
  createVMJob.setUser(true);
  createVMJob.schedule();
}

Fixed version (ground truth):
private void performCreateVM(String vmName,String boxRef,String vmFile,Map<String,String> environment){
  final Job createVMJob=new Job(DVMessages.getFormattedString(CREATE_VM_MSG)){
    @Override protected IStatus run(    final IProgressMonitor monitor){
      monitor.beginTask(DVMessages.getFormattedString(CRATE_VM_TITLE,vmName),IProgressMonitor.UNKNOWN);
      IVagrantConnection connection=VagrantService.getInstance();
      if (findVM(connection,vmName) != null) {
        Display.getDefault().syncExec(() -> MessageDialog.openError(Display.getCurrent().getActiveShell(),WizardMessages.getString("String_Node_Str"),WizardMessages.getString("String_Node_Str")));
        return Status.CANCEL_STATUS;
      }
      IVagrantBox box=null;
      File vagrantDir;
      String boxName=boxRef;
      if (vmFile == null) {
        boolean isValidURL=true;
        try {
          new URL(boxRef);
        }
 catch (        MalformedURLException e1) {
          isValidURL=false;
        }
        if (Paths.get(boxRef).toFile().canRead() || isValidURL) {
          try {
            String boxPath=boxRef;
            boxName=boxRef.substring(boxRef.lastIndexOf(File.separator) + 1).replace("String_Node_Str","String_Node_Str");
            connection.addBox(boxName,boxPath,isValidURL);
          }
 catch (          VagrantException e) {
          }
catch (          InterruptedException e) {
          }
        }
        vagrantDir=performInit(vmName,boxName,connection);
        box=findBox(connection,boxName);
        while (box == null && isValidURL) {
          try {
            Thread.sleep(1000);
          }
 catch (          InterruptedException e) {
          }
          connection.getVMs(true);
          box=findBox(connection,boxName);
          if (monitor.isCanceled()) {
            CommandUtils.delete(vagrantDir);
            return Status.CANCEL_STATUS;
          }
        }
      }
 else {
        vagrantDir=Paths.get(vmFile).getParent().toFile();
      }
      EnvironmentsManager.getSingleton().setEnvironment(vagrantDir,environment);
      String provider=(box == null ? null : box.getProvider());
      connection.up(vagrantDir,provider);
      connection.getVMs(true);
      return Status.OK_STATUS;
    }
  }
;
  createVMJob.setUser(true);
  createVMJob.schedule();
}