New Alternative Serialization classes for Multiplayer Network Games

Hello Games Developers,
I've been working on an alternative Serialization technique that attempts to over-come the de-serialization problems of garbage collection and object-finding on the client side.
I'd like people to try it out and also I need some know-how on HotSpot optimisation, please check out the progress at the Serialization forum at
http://forum.java.sun.com/thread.jspa?messageID=3990301
Cheers,
Keith

Well, your game is great and all, but the code is really in-depth. We aren't looking for something that complex, just the basics for right now. I have to have something simple to build with right now in order to eventually make something amazing.

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Slow network game

Hi. I am trying to make a multiplayer network game. I got the game to work over a network connection, but there is a delay when I send and receive data and the delay seems to get bigger the longer the program runs. As you can see, I send 20 bytes and this is send about 30 times a second but should this be a problem on a localarea network?
Here is the code I use for sending and receiving:
// Class that send data
import java.io.*;
import java.net.*;
public class SendNet {
    int port;
    String group;
    MulticastSocket s;
    public SendNet() {
        System.out.println("Connected SendNet");
        port = 5000;
        group = "230.0.0.1";
        try {
            s = new MulticastSocket();
            System.out.println("Connected!");
        } catch (IOException e) {System.out.println("Error");}
    public void sendData(String up, String down, String left, String right) {
         try
            String st = up+"-"+down+"-"+left+"-"+right+"-";
            System.out.println("Sending: "+st);
            byte[] b = new byte[st.length()];
            b = st.getBytes();
            DatagramPacket pack = new DatagramPacket(b, b.length, InetAddress.getByName(group), port);
            s.send(pack);
        } catch (IOException e) {}
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        try {
            s.leaveGroup(InetAddress.getByName(group));
            s.close();
        } catch (IOException e) {}
// Class that receive data
import java.net.*;
import java.io.*;
public class ReceiveNet {
    int port;
    String group;
    MulticastSocket s;
    String[] move;
    public ReceiveNet() {
        port = 5000;
        group = "230.0.0.1";
        try {
            s = new MulticastSocket(port);
            s.joinGroup(InetAddress.getByName(group));
            System.out.println("Connected!");
        } catch (IOException e) {System.out.println("Error");}
    public String[] getData() {
        byte buffer[] = new byte[20];
        DatagramPacket pack = new DatagramPacket(buffer, buffer.length);
        try
            s.receive(pack);
            String st=new String(pack.getData());
            move = st.split("-");
            System.out.println("Receiving: "+st);
        catch (IOException e) {}
        return move;
    public void closeConnection() {
        try {
            s.leaveGroup(InetAddress.getByName(group));
            s.close();
        } catch (IOException e) {}
}I've never played around with networking before, so maybe I am doing something wrong, or is it just this form of connection (multicastsocket) that is slow.

I've never used multicast... but seeing as how nobody replied I'll add a few comments.
First, I see you specify a port and group in the sender, but it's never used when initializing your connection. Is that a mistake?
Second, there are a few places where you are creating excess objects which will eventually cause the garbage collector to do some work... which could conceivably slow things down. For example:
// #1. You are creating a new String for every invocation of sendData.
# instead, you could use a StringBuffer, or build your data directly in a byte[]
String st = up+"-"+down+"-"+left+"-"+right+"-";
// #2. You are allocating a byte array and throwing it away. st.getBytes()
// returns its own byte array.
byte[] b = new byte[st.length()];
b = st.getBytes();
// change to:
byte[] b = st.getBytes();
// #3. Related to #1, you are creating a new String object with every receive.
s.receive(pack);
String st=new String(pack.getData());Not sure whether those are the sources of your slowdown. If you still have trouble, how about providing the code which contains the send/receive loops?

[announce] tool for selecting network from console (netcfg-based)

Hi all!
I'm happy to announce new 'wifi-select' tool for selecting networks "in real-time" (in NetworkManager manner). I heard on the forums there were requests for such a tool from the users of netcfg. The tool is convinient for use in wifi-cafe or another places you are visiting first (and maybe last) time. Then you don't need to create the file-profile for a new network, just type 'sudo wifi-select eth1' and choose the network you need.
The tool is currently packaged and available in AUR (yaourt -S wifi-select).
It works as follows:
- parses 'iwlist scan' and presents list of networks along with its security settings (wpa/wep/none) using 'dialog'.
- if user selects network with existing profile -- just use this profile to connect with 'netcfg'.
- if user selects a new network (for example network from wifi-cafe he currently visited), net-select automatically generates new profile with corresponding $SECURITY and asks for the key (if needed). It uses DHCP as $IP by default.
- then, if connection succeeds, profile is saved for later usage.
- if connection fails, user is asked if he/she wants to keep generated profile for further usage (for example to change $IP to static or adjust some additional options).
Parsing of 'iwlist' output is done using AWK script (this seems to be clearer than grep+sed in my case). I've put it under /usr/lib/network (where netcfg .subr-files are located).
I sent the scripts to James Rayner aka iphitus (maintainer of netcfg), he was interested and suggested to package the tool in AUR and if there would be some attention and interest -- he would package it in extra.
So, I'm waiting for your feedback and questions.
[crossposted in 'Community contributions': http://bbs.archlinux.org/viewtopic.php?id=63973]
Thank you!
With best regards,
Ivan N. Veselov.
Last edited by dying_sphynx (2009-01-28 11:03:30)

Don't cross-post.
http://bbs.archlinux.org/viewtopic.php?id=63973

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first i was wondering what everyone thinks about macbooks compared to let's say another pc like hp,dell,etc.... i have been told that i'd have to be dumb to get a machine with windows vista on it,so that is why i have turned my focus to a macbook because i have heard they are pretty good and worth it...
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also any other ideas on getting iwork or office, a hard plastic case or a skin,thanks alot for anyone's input it is greatly appreciated.... i am looking to get one once leopard comes out thanks!!
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No serializer found for class com.sun.xml.messaging.saaj.soap.ver1_1.Messag

Hi,
I am developing a soap web service using apache axis tool. I am using tomcat6 and jdk6. I need to return SOAPMessage as return object from remote interface methods. Now I have success fully deploy web service in tomcat. Also I have create client too, but when I am trying to call web service throw client then it show me a exception on client is
org.xml.sax.SAXParseException: Premature end of file.
and on server log, it show me this exception
java.io.IOException:
xisFault
faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server.userException
faultSubcode:
faultString: java.io.IOException: No serializer found for class com.sun.xml.messaging.saaj.soap.ver1_1.M
ssage1_1Impl in registry org.apache.axis.encoding.TypeMappingDelegate@98062f
faultActor:
faultNode:
faultDetail:
       {http://xml.apache.org/axis/}stackTrace:java.io.IOException: No serializer found for class com.su
.xml.messaging.saaj.soap.ver1_1.Message1_1Impl in registry org.apache.axis.encoding.TypeMappingDelegate@
8062f
       at org.apache.axis.encoding.SerializationContext.serializeActual(SerializationContext.java:1507)
       at org.apache.axis.encoding.SerializationContext.serialize(SerializationContext.java:980)
       at org.apache.axis.encoding.SerializationContext.outputMultiRefs(SerializationContext.java:1055)
       at org.apache.axis.message.SOAPBody.outputImpl(SOAPBody.java:145)
       at org.apache.axis.message.SOAPEnvelope.outputImpl(SOAPEnvelope.java:478)
       at org.apache.axis.message.MessageElement.output(MessageElement.java:1208)
       at org.apache.axis.SOAPPart.writeTo(SOAPPart.java:315)
       at org.apache.axis.SOAPPart.writeTo(SOAPPart.java:269)
       at org.apache.axis.Message.writeTo(Message.java:539)
       at org.apache.axis.transport.http.AxisServlet.sendResponse(AxisServlet.java:902)
       at org.apache.axis.transport.http.AxisServlet.doPost(AxisServlet.java:777)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
       at org.apache.axis.transport.http.AxisServletBase.service(AxisServletBase.java:327)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:2
0)
       at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
       at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
       at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
       at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
       at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
       at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
       at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
       at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
       at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:58
       at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
       at java.lang.Thread.run(Thread.java:619)
       {http://xml.apache.org/axis/}hostname:EMRG-409964-L19
ava.io.IOException: No serializer found for class com.sun.xml.messaging.saaj.soap.ver1_1.Message1_1Impl
n registry org.apache.axis.encoding.TypeMappingDelegate@98062f
       at org.apache.axis.AxisFault.makeFault(AxisFault.java:101)
       at org.apache.axis.SOAPPart.writeTo(SOAPPart.java:317)
       at org.apache.axis.SOAPPart.writeTo(SOAPPart.java:269)
       at org.apache.axis.Message.writeTo(Message.java:539)
       at org.apache.axis.transport.http.AxisServlet.sendResponse(AxisServlet.java:902)
       at org.apache.axis.transport.http.AxisServlet.doPost(AxisServlet.java:777)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
       at org.apache.axis.transport.http.AxisServletBase.service(AxisServletBase.java:327)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:2
0)
       at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
       at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
       at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
       at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
       at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
       at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
       at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
       at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
       at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:58
       at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
       at java.lang.Thread.run(Thread.java:619)
aused by: java.io.IOException: No serializer found for class com.sun.xml.messaging.saaj.soap.ver1_1.Mess
ge1_1Impl in registry org.apache.axis.encoding.TypeMappingDelegate@98062f
       at org.apache.axis.encoding.SerializationContext.serializeActual(SerializationContext.java:1507)
       at org.apache.axis.encoding.SerializationContext.serialize(SerializationContext.java:980)
       at org.apache.axis.encoding.SerializationContext.outputMultiRefs(SerializationContext.java:1055)
       at org.apache.axis.message.SOAPBody.outputImpl(SOAPBody.java:145)
       at org.apache.axis.message.SOAPEnvelope.outputImpl(SOAPEnvelope.java:478)
       at org.apache.axis.message.MessageElement.output(MessageElement.java:1208)
       at org.apache.axis.SOAPPart.writeTo(SOAPPart.java:315)
       ... 19 moreI have deploy new version of saa-impl.jar and saaj-api.jar too. And I also have deploy webservice-rt.jar too in server lib and application lib folder. but still this exception is there. I dont understand, how can I over come from this error. If some one have resolved this type of exception then please reply. Please reply me on [email protected]
--Thanks in Advance
Umashankar Adha
Sr. Soft. Eng.
United States

FYI, now I'm in work:
import javax.xml.namespace.*;
import javax.xml.rpc.*;
import javax.activation.*;
import javax.mail.*;
import com.sun.xml.messaging.saaj.*;
-classpath D:\jwsdp-1.3\jaxp\lib\endorsed\dom.jar;D:\jwsdp-1.3\jaxp\lib\endorsed\xercesImpl.jar;D:\jwsdp-1.3\saaj\lib\saaj-impl.jar;D:\jwsdp-1.3\saaj\lib\saaj-api.jar;D:\jwsdp-1.3\jwsdp-shared\lib\activation.jar;D:\jwsdp-1.3\jwsdp-shared\lib\mail.jar;D:\jwsdp-1.3\jaxrpc\lib\jaxrpc-api.jar;D:\jwsdp-1.3\jaxrpc\lib\jaxrpc-impl.jar;D:\jwsdp-1.3\jaxrpc\lib\jaxrpc-spi.jar;D:\jwsdp-1.3\jwsdp-shared\lib\jax-qname.jar
Those are what I had to use to get it working.
Chris

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Please suggest me which method (is Helper classes or Using EJBs) is perferable :
1) to get better performance
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2) for less network traffic
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3) for better container resource utilization
Again, the EJB version will consume a lot more container resources.

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New Alternative Serialization classes for Multiplayer Network Games

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