java：OverlappingFileLockException

Question

我想锁定文件，然后对其进行一些更新，但每次我想进行此操作时，我都会得到：java.nio.channels.overlappingFilelockException，我尝试使用这段代码添加带有此异常的 catch 子句：

catch(OverlappingFilelockException e){
lock.relese();
}

但这对我不起作用。这是我的 java 代码，我应该怎么做才能摆脱这个异常？

     File file = new File("C://Users//user//Desktop//conf1.xml");
        String content = '';
        BufferedReader s;
        BufferedWriter w;
        RandomAccessFile  ini=new RandomAccessFile(file, "rwd");;
        FileLock lock= ini.getChannel().tryLock();;
        def flowFile1=session.create();

        DocumentBuilder dBuilder = null;
        Document  doc=null;
        String start, startDate, endDate, runAs, makeVersion, patch;
        try {

            String sCurrentLine;
            s = new BufferedReader(Channels.newReader(ini.getChannel(), "UTF-8"));


            while ((sCurrentLine = s.readLine()) != null) {
                content += sCurrentLine;
            }
            ini.seek(0);




            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            DOMSource source = new DOMSource(doc);
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            StreamResult result1 = new StreamResult(bos);
            try {
                transformer.transform(source, result1);
            } catch (TransformerException e) {
                e.printStackTrace();
            }
            byte[] array = bos.toByteArray();
            String data = bos.toString();
            if (!data.isEmpty()) {
                ini.setLength(0);
                w = new BufferedWriter(Channels.newWriter(ini.getChannel(), "UTF-8"));
                w.write(data);
                lock.release();
                w.close();



            }



        }catch (FileNotFoundException e) {
            Thread.sleep(5000);


        } catch (Exception e) {
            e.printStackTrace();
        }
        finally {



            lock.release();
            ini.close();
        }

Answer 1

OverlappingFilelockException 以大写字母开头。您的 catch 语句无法编译，因为 overlappingFilelockException（小写）未知。更正它，您的异常将按预期被捕获。

很可能会抛出文件锁定异常，因为其他 process/thread 持有该文件的锁。看看这是谁，由锁持有者释放锁，然后重试。

Answer 2

catch (OverlappingFileLockException e) {
    lock.release();
}

什么锁？你没有得到锁。你有一个例外。而不是锁。您甚至没有 lock 变量，因为它不在范围内。

删除 release() 行。

java：OverlappingFileLockException

java :OverlappingFileLockException

java

nio

apache-nifi