How to restart thread in java? [duplicate]

Question

I have created a program which searches for files in a source folder. If it finds any file, it processes that file and moves it to a destination folder, then looks for a new file in the source folder. It has to keep on checking the source folder for a file.

I have used a thread to look for files in the source folder. The problem I am facing is whenever any exception is thrown during file processing, the thread gets stopped. I want the thread to be running even if an exception is thrown. It has to move the file that caused the error to some other folder and look for a new file in the source folder. How can I make the thread keep on running?

Eg:

public void run() {
    try {
        searchfile();
    }
    catch(Exception e) {
        e.printStackTrace();
    }
}

public void searchfile(){
  ...
}

---

Update :

I should be more clear in my question. Actually there are 4 source folders and 4 destination folders. I have to perform the same operation in each source & destination pair. So i have created 4 threads in one class and do the operation in separate class.

class MainClass
{
   public static void main(String[] args){
      for(int i=0;i<4;i++){
         SearchClass search = new SearchClass();
         Thread thread = new Thread(search);
         thread.start();
     }
   }   
}

class SearchClass
{
   public void run() {
   try {
      searchfile();
   } catch(Exception e) {
      e.printStackTrace();
   }
}

public void searchfile(){ ... } }

All the thread wont stop running eventhough it caught any exception in middle. How can i do that?

Answer 1

If a thread is dying due to an uncaught exception, the answer is simple: catch the exception at an appropriate place so that you can keep going. Either catch the exception within your searchfile method, or make the run method call searchfile in a loop.