As discussed here – The issue is that java.io.File has many oddities, on Windows in particular. In this case it resets the file attributes before it deletes the file so this is why it does not fail as might be expected. It is behavior that dates back >10 years and so would be risky to … Read more
It’s not an implementation specific bug. The size is defined in the FileChannel.map as long, but… size – The size of the region to be mapped; must be non-negative and no greater than Integer.MAX_VALUE All compliant JVM implementations will be this way. I suspect the reason is a combination of history (who would need to … Read more
NIO and Comet are completely unrelated: you can mix-and-match them. Using the NIO (or APR for that matter) connector allows you to handle more requests with fewer threads due to the threading model. See http://tomcat.apache.org/tomcat-7.0-doc/config/http.html#Connector_Comparison for a comparison between the Connectors. Comet (and Websocket) have a completely different dispatch model which requires a different application … Read more
Check out the CharsetEncoder and CharsetDecoder API descriptions – You should follow a specific sequence of method calls to avoid this problem. For example, for CharsetEncoder: Reset the encoder via the reset method, unless it has not been used before; Invoke the encode method zero or more times, as long as additional input may be … Read more
What causes a “broken pipe”, and more importantly, is it possible to recover from that state? It is caused by something causing the connection to close. (It is not your application that closed the connection: that would have resulted in a different exception.) It is not possible to recover the connection. You need to open … Read more
Your SocketChannel handling seems to be incomplete, see this complete example for SocketChannels transferring a byte: /* * Writer */ import java.io.IOException; import java.io.ObjectOutputStream; import java.net.InetSocketAddress; import java.nio.channels.ServerSocketChannel; import java.nio.channels.SocketChannel; public class Sender { public static void main(String[] args) throws IOException { System.out.println(“Sender Start”); ServerSocketChannel ssChannel = ServerSocketChannel.open(); ssChannel.configureBlocking(true); int port = 12345; ssChannel.socket().bind(new InetSocketAddress(port)); … Read more
I am a big fan of Java’s MappedByteBuffers for situations like this. It is blazing fast. Below is a snippet I put together for you that maps a buffer to the file, seeks to the middle, and then searches backwards to a newline character. This should be enough to get you going? I have similar … Read more
I have much better response times if I change folder.register(watcher, StandardWatchEventKinds.ENTRY_MODIFY); to folder.register(watcher, new WatchEvent.Kind[]{StandardWatchEventKinds.ENTRY_MODIFY}, SensitivityWatchEventModifier.HIGH);
There seem to be some bugs with the implementation referred to by Thilo, and also copy and pasted on other sites verbatim: ByteBufferBackedInputStream.read() returns a sign extended int representation of the byte it reads, which is wrong (value should be in range [-1..255]) ByteBufferBackedInputStream.read(byte[], int, int) does not return -1 when there are no bytes … Read more