Java file copy problem using FileWriter class

I am just trying play with FileReader and FileWriter classes to practice Java and wrote the method below to copy the content of a file called poem.txt to a new file poem_new.txt .

Upon calling the method from a separate main class it runs successfully and creates the new file poem_new.txt but doesn't copy the content of poem.txt. In fact, it generates an empty zero byte file.

In order to check wether file reading is correct I used the temporary print statement by removing the commenting and it seems read function is reading the characters fine.

Could some please help me understand where I am wrong?

Thank you.

public void copyFileCharacterWise(){

try{

FileReader fr = new FileReader("./poem.txt");
FileWriter fw = new FileWriter("./poem_new.txt");

 int x = fr.read();

  while(x != -1){
    //System.out.printf("value is %s %n",x);
    fw.write(x);
    x = fr.read();
   }
  }

catch(FileNotFoundException fnfe){ System.out.println("File not found or cannot read write"); } catch(IOException e){ System.out.println("Cannot read or write the file"); } }