Date: Wed, 04 Jun 2003 22:10:00 -0400 From: Michael E Mercer <mmercer@nc.rr.com> To: "'FreeBSD Java mailing list'" <freebsd-java@FreeBSD.ORG> Subject: UnsatisfiedLinkError running nio example code NBTimeServer Message-ID: <3EDEA678.D6EDF17D@nc.rr.com>
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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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