UnsatisfiedLinkError running nio example code NBTimeServer
Alexey Zelkin
phantom at FreeBSD.org.ua
Thu Jun 5 00:24:37 PDT 2003
hi,
Unfortunatelly sun.nio.ch.DevPollArrayWrapper is Solaris' onlu thingy
and not implemented for both linux and bsd. I'll take a look.
Thanks for notice!
On Wed, Jun 04, 2003 at 10:10:00PM -0400, Michael E Mercer wrote:
> Hello,
>
> > uname -a
> FreeBSD 4.8-STABLE FreeBSD 4.8-STABLE #1: Sat May 31 21:15:33 EDT 2003 i386
>
> > java -version
> java version "1.4.1-p3"
> Java(TM) 2 Runtime Environment, Standard Edition (build
> 1.4.1-p3-mmercer_13_may_2003_19_57)
> Java HotSpot(TM) Client VM (build 1.4.1-p3-mmercer_13_may_2003_19_57, mixed
> mode)
>
>
> When I compiled the example code below and tried to run it, I get the following
> error...
>
> > java NBTimeServer
> Exception in thread "main" java.lang.UnsatisfiedLinkError: init
> at sun.nio.ch.DevPollArrayWrapper.init(Native Method)
> at sun.nio.ch.DevPollArrayWrapper.<init>(DevPollArrayWrapper.java:59)
> at sun.nio.ch.DevPollSelectorImpl.<init>(DevPollSelectorImpl.java:54)
> at
> sun.nio.ch.DevPollSelectorProvider.openSelector(DevPollSelectorProvider.java:18)
>
> at NBTimeServer.acceptConnections(NBTimeServer.java:67)
> at NBTimeServer.<init>(NBTimeServer.java:56)
> at NBTimeServer.main(NBTimeServer.java:120)
>
> > cat NBTimeServer.java
> /*
> * @(#)NBTimeServer.java 1.4 01/12/13
> * A non blocking Internet time server implemented using
> * the New I/O (NIO) facilities added to J2SE v 1.4.
> *
> * Copyright 2001-2002 Sun Microsystems, Inc. All Rights Reserved.
> *
> * Redistribution and use in source and binary forms, with or
> * without modification, are permitted provided that the following
> * conditions are met:
> *
> * -Redistributions of source code must retain the above copyright
> * notice, this list of conditions and the following disclaimer.
> *
> * -Redistribution in binary form must reproduct the above copyright
> * notice, this list of conditions and the following disclaimer in
> * the documentation and/or other materials provided with the
> * distribution.
> *
> * Neither the name of Sun Microsystems, Inc. or the names of
> * contributors may be used to endorse or promote products derived
> * from this software without specific prior written permission.
> *
> * This software is provided "AS IS," without a warranty of any
> * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
> * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
> * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
> * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY
> * DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT OF OR
> * RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THE SOFTWARE OR
> * ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE
> * FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT,
> * SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
> * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF
> * THE USE OF OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN
> * ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
> *
> * You acknowledge that Software is not designed, licensed or
> * intended for use in the design, construction, operation or
> * maintenance of any nuclear facility.
> */
>
> import java.io.*;
> import java.nio.*;
> import java.nio.channels.*;
> import java.nio.channels.spi.*;
> import java.net.*;
> import java.util.*;
>
> // Listen on a port for connections and write back the current time.
> public class NBTimeServer {
> private static final int DEFAULT_TIME_PORT = 8900;
>
> // Constructor with no arguments creates a time server on default port.
> public NBTimeServer() throws Exception {
> acceptConnections(this.DEFAULT_TIME_PORT);
> }
>
> // Constructor with port argument creates a time server on specified port.
> public NBTimeServer(int port) throws Exception {
> acceptConnections(port);
> }
>
> // Accept connections for current time. Lazy Exception thrown.
> private static void acceptConnections(int port) throws Exception {
> // Selector for incoming time requests
> Selector acceptSelector = SelectorProvider.provider().openSelector();
>
> // Create a new server socket and set to non blocking mode
> ServerSocketChannel ssc = ServerSocketChannel.open();
> ssc.configureBlocking(false);
>
> // Bind the server socket to the local host and port
>
> InetAddress lh = InetAddress.getLocalHost();
> InetSocketAddress isa = new InetSocketAddress(lh, port);
> ssc.socket().bind(isa);
>
> // Register accepts on the server socket with the selector. This
> // step tells the selector that the socket wants to be put on the
> // ready list when accept operations occur, so allowing multiplexed
> // non-blocking I/O to take place.
> SelectionKey acceptKey = ssc.register(acceptSelector,
> SelectionKey.OP_ACCEPT);
>
> int keysAdded = 0;
>
> // Here's where everything happens. The select method will
> // return when any operations registered above have occurred, the
> // thread has been interrupted, etc.
> while ((keysAdded = acceptSelector.select()) > 0) {
> // Someone is ready for I/O, get the ready keys
> Set readyKeys = acceptSelector.selectedKeys();
> Iterator i = readyKeys.iterator();
>
> // Walk through the ready keys collection and process date requests.
>
> while (i.hasNext()) {
> SelectionKey sk = (SelectionKey)i.next();
> i.remove();
> // The key indexes into the selector so you
> // can retrieve the socket that's ready for I/O
> ServerSocketChannel nextReady =
> (ServerSocketChannel)sk.channel();
> // Accept the date request and send back the date string
> Socket s = nextReady.accept().socket();
> // Write the current time to the socket
> PrintWriter out = new PrintWriter(s.getOutputStream(), true);
> Date now = new Date();
> out.println(now);
> out.close();
> }
> }
> }
>
> // Entry point.
> public static void main(String[] args) {
> // Parse command line arguments and
> // create a new time server (no arguments yet)
> try {
> NBTimeServer nbt = new NBTimeServer();
> } catch(Exception e) {
> e.printStackTrace();
> }
> }
> }
>
>
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