Java: opening and reading from a file without locking it.

Posted by rogue780 on Stack Overflow See other posts from Stack Overflow or by rogue780
Published on 2010-03-29T10:52:05Z Indexed on 2010/03/29 10:53 UTC
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I need to be able to mimic 'tail -f' with Java. I'm trying to read a log file as it's being written by another process, but when I open the file to read it, it locks the file and the other process can't write to it anymore. Any help would be greatly appreciated!

Here is the code that I'm using currently:

public void read(){
    Scanner fp = null;
    try{
        fp = new Scanner(new FileReader(this.filename));
        fp.useDelimiter("\n");
    }catch(java.io.FileNotFoundException e){
        System.out.println("java.io.FileNotFoundException e");
    }
    while(true){
        if(fp.hasNext()){
            this.parse(fp.next());
        }           
    }       
}

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