Oraclient9i.dll error in multi threaded delphi server application

I created a multi threaded server application in delphi using oracle9i and indy server components. When I run my application, I am getting an error "oraclient9i.dll" error when executing my SQL statements. I have check communication between my server application and the client application without using oracle and its working fine, its only when I started executing SQL statements when I got this error.
Can anybody help me with this problem or point me to the right direction on how to resolve this issue.
thanks

> I have tried what you suggested. I have created a
seperate TOracleSession on each thread that I create
on the OnConnect event however I am having Problems
using the oraclesession created on the OnExecute
event. Somehow it is still executing the SQL that I
have created on the main form where I first opened an
oraclesession component created on the main form.
It sounds then like the TOracleSession object in the thread is a copy of the one in the main thread/form.
> Do you think that It would work if I create an
instance of the TOracleDatasets and TOracleQuery on
the OnExecute event and also at the same time create
my TOracleSession on this event and continue
processing the data receive from the client server.
I've never used the Indy components for threading. The default TThread class worked just fine for me.
What I used to do is define the session and database objects as privates in my new thread class (let's call it TThreadSQL) - which was subclassed from TThread.
The constructor of this new TThreadSQL class did the following (writing here purely from memory - have not done Delphi for some time now): constructor TThreadSQL.Create( TNSalias, username, password : string );
// constructor is called with the Oracle session connection details
begin
inherited Create; // call the parent class constructor
CreateOracleSession; // call own private method to create an Oracle connection
end;
The CreateOracleSession method would then:
- create a BDE Session (TSession) object
- create a BDE Database (TDatabase) object, using the BDE Oracle native driver and an Oracle TNS alias plus username and password for connection
The destructor would close the connection. The Execute method which is used to fire up the thread, would use a TQuery object (or whatever) to execute a SQL using it owns connection.

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Multi-threaded performance server using 2 ports to two-way communication

Hi, I'm new in the forums so welcome everyone. I'm developing now an online computer game based on orginal Polish board-game, but it doesn't mean. Important is that I need to develope a high-performance multi-threaded server, which can serve... let's say few hundres of games, and a thousend of players simulateously. My server works on two ports/sockets.
First one is represented by "ServerSocketChannel clientConSsc" in my code. The main thread in my server class which invokes the method "run()" (which You can see below), registers clientConSsc with Selector and then repeatingly accepts incoming connections from clients on this socket. When connection(channel) is estabilished and clients wants to write some request to this channel, the main thread on server creates a new instance of class "RequestHandler" which extends Thread and handles this request (reads the request from channel, makes some changes on server, spreads some new messages to other clients in the same game and so on... everything on the same socket/port/channel). Then the channel/connection is closed by the server - I call such connections: "a short connections". In the same time the main thread continues the loop and is still able to accept connections from another players. That's the idea of multi-threaded server, right? :) And to this point, everything works fine, but... what if the server wants to trigger some new command, write new information to client?
Server could have tried to open a SocketChannel to client's IP address, but then the client programme would have to create and ServerSocketChannel object, bind it to some InetAddress and then... and then client becomes a server! - that breaks the idea of client-server cooperation and demands on players of my game to have routed some port on their machines. To resolve this problem I made some sort of "system" which, when some player/client is logging into my server, accepts second (this time constant, not "short") connection on the second port I mentoined on the beginning. This connection is held in variable "SocketChannel serverCon" of class "Player" - which reflects a player logged onto server. Server maintains every such connection till the client logs off. After the connection is accepted, the player whom connection it was is added to collection called "playersToRegisterToWrite". After the Selector.selectNow() is invoked (as You can see in the code below), each and every player's connection is registered in selector (with selection key - OP_WRITE and attachment pointing on owning player). In the same time client's code is trying to read some bytes from this connection and blocks on it until some bytes are written to this connection. When server wants to "tell" something to client, deliver some message/command, it creates a new instance of class which extends an abstract class called "ServerAction" (another new thread) and adds it to collection "actionsToDo". In ServerAction's method "run()" there are whole code to interact with client (e.g. send an update of players' list, an update of games' list, a chat message). Finnaly when Selector informs the server that some connection is writable (some client is waiting for commands), then server checks if there's any "actionToDo" involving this client/player. If there is, it unregisters the connection from Selector (so no other ServerAction (thread) can write on this connection) and starts the action. At the end of every "run()" method of subclass of ServerAction there's a code, which again adds the player to collection "playersToRegisterToWrite", so the player's connection can again be registered in Selector and the player can again receive informations from server - after it consumed THIS "ServerAction".
It looks to me like it should be working fine, but it's not. When I test my server and clients on the same machine (no ping/latency) everything seems to be working fine. But when it comes to play my game with somebody even on LAN or through the Internet there comes the problems. My first socket I describe (and first type of connections - short connections) works perfectly fine, so the requests triggered by client are delivered and handled properly. But the second socket is cirppling. For example: the server triggers a command refering to an update of clients logged to server' list. It is triggered by Selector so the client should be ready to read data from server, so the server sends data! And the client never receives it... Why?
It experimented a whole lot of time on SocketChannel's method "configureBlocking(boolean)", but it never helps. I think the client should always block it's listening thread on connection, contratry to server which is ment to be fast, so it should send the data through non-blocking channels. Am I right? Are there any rules refering blocking configuration of SocketChannels?
I will be grateful for every answer. To help You out I attach also drafts from run()'s methods of my classes.
Server's main method - main thread :
    public void run() {
       try {
            selector = Selector.open();
            clientConSsc.configureBlocking(false);
            clientConSsc.register(selector , SelectionKey.OP_ACCEPT);
            while(serverRunning) {
                try {
                    selector.selectNow();
                    Iterator it;
                    synchronized(playersToRegisterToWrite) {
                        it = playersToRegisterToWrite.iterator();
                        while(it.hasNext()) {
                            Player player = (Player)it.next();
                            it.remove();
                            player.serverCon.configureBlocking(false);
                            player.serverCon.register(selector , SelectionKey.OP_WRITE , player);
                    Set keys = selector.selectedKeys() {
                    it = keys.iterator();
                    while(it.hasNext()) {
                        SelectionKey key = (SelectionKey)it.next();
                        if(key.isAcceptable()) {
                            it.remove();
                            clientCon = clientConSsc.accept();
                            clientCon.configureBlocking(false);
                            clientCon.register(selector , SelectionKey.OP_READ);
                            continue;
                        if(key.isReadable()) {
                            it.remove();
                            key.cancel();
                            new RequestHandler(this , (SocketChannel)key.channel()).start();
                            continue;
                        if(key.isWritable()) {
                            if(key.attachment() != null ) {
                                ServerAction action = null;
                                synchronized(actionsToDo) {
                                    Iterator aIt = actionsToDo.iterator();
                                    while(aIt.hasNext()) {
                                        ServerAction temp = (ServerAction)aIt.next();
                                        if(temp.getPlayer().equals((Player)key.attachment())) {
                                            action = temp;
                                            aIt.remove();
                                            break;
                                if(action != null) {
                                    key.channel().configureBlocking(false);
                                    it.remove();
                                    key.cancel();
                                    action.start();
                            continue;
                } catch(Exception e) {
                    statusArea.append(e.toString() + "\n");
                    e.printStackTrace();
                    continue;
        } catch(ClosedChannelException e) {
            statusArea.append(e.toString() + "\n");
        } catch(IOException e) {
            statusArea.append(e.toString() + "\n");
            A part of server's RequestHandler's class' method run() - the method which handles requests triggered by client on first port:
public void run() {
        boolean served = false;
            try {
                channel.configureBlocking(true);
                retryCount++;
                retry = false;
                String command = ns.readText(channel).trim();
                ns.statusArea.append("ktos przesyla komende: " + command + "\n");
                if(command != null && !command.equals("ERROR")) {
                    String[] cmd = command.split("�");
                    ns.statusArea.append("komenda: " + cmd[0] + "\n");
                    if(cmd[0].equals("CHAT")) {
                        if(cmd.length != 5) {
                            retry();
                        } else {
                            if(cmd[2].equals("NOGAME")) {      // jezeli nie ma okreslonej gry czyli rozsylamy do wszystkich
                                for(int i = 0 ; i < ns.loggedPlayersListItems.size() ; i++) {
                                    Player current = (Player)ns.loggedPlayersListItems.get(i);
                                    if(current.state == Player.CHOOSING && !current.equals(new Player(Integer.parseInt(cmd[1]))))   // jezeli gracz jest w okienku wybierania gry to wysylamy mu broadcast
                                        ns.actionsToDo.add(new SendMsg(ns , current , "CHAT�" + cmd[1] + "�" + cmd[3] + "�" + cmd[4]));
                            } else {
                                Game game = (Game)ns.gamesListItems.get(ns.gamesListItems.indexOf(new Game(Integer.parseInt(cmd[2]))));
                                for(int i = 0 ; i < game.players.size() ; i++) {
                                    Player current = (Player)game.players.get(i);
                                    if(!current.equals(new Player(Integer.parseInt(cmd[1]))))
                                        ns.actionsToDo.add(new SendMsg(ns , current , "CHAT�" + cmd[1] + "�" + cmd[3] + "�" + cmd[4]));
                            served = true;
                    } else if(cmd[0].equals("GETGAMEINFO")) {
                        if(cmd.length != 3)
                            retry();
                        else {
                            int gameID = Integer.parseInt(cmd[2]);
                            ns.statusArea.append("poproszono o informacje o grze nr: " + gameID + "\n");
                            Game checkedGame = new Game(gameID);
                            if(ns.gamesListItems.contains(checkedGame)) {
                                Game game = (Game)ns.gamesListItems.get(ns.gamesListItems.indexOf(checkedGame));
                                channel.configureBlocking(true);
                                ObjectOutputStream oos = new ObjectOutputStream(channel.socket().getOutputStream());
                                oos.writeObject(game);
                                oos.writeObject(game.players);
                                oos.flush();
                                ns.statusArea.append("wyslano informacje o grze nr: " + gameID + "\n");
                            } else {
                                ns.statusArea.append("brak gry o nr: " + gameID + "\n");
                            served = true;
            } catch(IOException e) {
                e.printStackTrace();
        if(!served) {
            ns.findAndDisconnectPlayer(channel);
        try {
            channel.close();
        } catch(IOException e) {
            e.printStackTrace();
    }An example of ServerAction's subclass - the class which triggers server commands to client on second port:
class UpdateLoggedPlayersList extends ServerAction {
    public UpdateLoggedPlayersList(NeuroServer ns , Player player) {
        super(ns , player);
    public void run() {
        try {
            serverCon.configureBlocking(true);
            ns.sendText("UPDATELOGGEDPLAYERSLIST" , serverCon);
            if(ns.readText(serverCon).equals("OK")) {
                ObjectOutputStream oos = new ObjectOutputStream(serverCon.socket().getOutputStream());
                oos.writeObject(ns.loggedPlayersListItems);
                oos.flush();
            synchronized(ns.playersToRegisterToWrite) {
                 ns.playersToRegisterToWrite.add(player);
        } catch(IOException e) {
            e.printStackTrace();
}A part of client's CmdHandler's class' method run() - the method which handles commands triggered by server:
public void run() {
    try {
        while(works) {
            String command = nc.readText(nc.serverCon);
            System.out.println("Server przesyla komende: " + command + "\n");
            String[] cmd = command.split("�");
            if(cmd[0] != null && !cmd[0].equals("ERROR")) {
                if(cmd[0].equals("CHAT")) {
                    if(nc.chooseGameDialog != null && nc.chooseGameDialog.isVisible()) {     // jezeli na wybieraniu gry
                        newChatEntry(cmd[2] , null , cmd[3] , nc.chooseGameDialog.chatPane);
                    } else if(nc.readyDialog != null && nc.readyDialog.isVisible()) { // jesli na przygotowywaniu
                        Player sender = (Player)nc.actGame.players.get(nc.actGame.players.indexOf(new Player(Integer.parseInt(cmd[1]))));
                        newChatEntry(cmd[2] , sender.fraction , cmd[3] , nc.readyDialog.chatPane);
                    } else if(nc.ng != null) {                   // jesli w grze
                        Player sender = (Player)nc.actGame.players.get(nc.actGame.players.indexOf(new Player(Integer.parseInt(cmd[1]))));
                        newChatEntry(cmd[2] , sender.fraction , cmd[3] , nc.ng.inGameChatPane);
                } else if(cmd[0].equals("UPDATELOGGEDPLAYERSLIST")) {
                    nc.sendText("OK" , nc.serverCon , false);
                    nc.serverCon.configureBlocking(true);
                    ObjectInputStream ois = new ObjectInputStream(nc.serverCon.socket().getInputStream());
                    DefaultListModel players = (DefaultListModel)ois.readObject();
                    nc.chooseGameDialog.updateLoggedPlayersList(players);
    } catch(IndexOutOfBoundsException e) {
        System.out.println(e);
    } catch(IOException e) {
        System.out.println(e);
    } catch(ClassNotFoundException e) {
        System.out.println(e);
}And two methods I used in codes above: sendText(String text , SocketChannel sc) and readText(SocketChannel sc) - they are my "utility" methods, which I use to send and receive Strings through specified SocketChannels.
boolean sendText(String text , SocketChannel sc) {
    ByteBuffer bbuf = ByteBuffer.allocate(BSIZE);
    boolean sendRetry;
    boolean sent = false;
    do {
        sendRetry = false;
        try {
            StringBuffer cmd = new StringBuffer();
            cmd.setLength(0);
            if(text.length()+4 < 100)
                cmd.append("0");
            if(text.length()+4 < 10)
                cmd.append("0");
            cmd.append(Integer.toString(text.length()+4) + "�");
            cmd.append(text);
            cmd.append("\n");
            bbuf = charset.encode(CharBuffer.wrap(cmd));
            sc.write(bbuf);
            bbuf.clear();
            int n = sc.read(bbuf);
            if(n == 1) {
                bbuf.flip();
                Byte re = bbuf.get();
                if(re == 1) {
                    sendRetry = true;
                } else {
                    sent = true;
        } catch(Exception e) {
            findAndDisconnectPlayer(sc);
            try {
                sc.close();
            } catch(IOException f) {
                f.printStackTrace();
            return false;
    } while(!sent && sendRetry);
    return true;
String readText(SocketChannel sc) {
    ByteBuffer bbuf = ByteBuffer.allocate(BSIZE);
    int readRetryCount = -1;
    boolean readRetry;
    do {
        readRetry = false;
        readRetryCount++;
        StringBuffer cmd = new StringBuffer();
        cmd.setLength(0);
        bbuf.clear();
        try {
            readLoop:
            while(true) {
                int n = sc.read(bbuf);
                if(n > 0) {
                    bbuf.flip();
                    CharBuffer cbuf = charset.decode(bbuf);
                    while(cbuf.hasRemaining()) {
                        char c = cbuf.get();
                        if(c == '\r' || c == '\n') break readLoop;
                        cmd.append(c);
                } else break;
            statusArea.append(Thread.currentThread().getId() + " readText() odczytuje: " + cmd.toString() + "\n");
            if(cmd.length() < 3 || Integer.parseInt(cmd.substring(0 , 3)) != cmd.length()) {
                sc.write(ByteBuffer.wrap(new byte[] {1}));
                readRetry = true;
            } else {
                sc.write(ByteBuffer.wrap(new byte[] {0}));    // length OK
                return cmd.toString().substring(4 , cmd.toString().length());
        } catch(Exception e) {
            findAndDisconnectPlayer(sc);
            try {
                sc.close();
            } catch(IOException f) {
                f.printStackTrace();
            return "ERROR";
    } while(readRetry && readRetryCount < 3);
    findAndDisconnectPlayer(sc);
    try {
        sc.close();
    } catch(IOException e) {
        e.printStackTrace();
    return "ERROR";
}Edited by: Kakalec on Jul 23, 2008 11:04 AM

You seem to be using a horrendous mixture of PrintWriters, BufferedReaders, ObjectOutputStreams, and no doubt ObjectInputStreams. You can't do that.
Some rules about this:
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https://social.technet.microsoft.com/forums/systemcenter/en-US/cd8a2c95-70db-4df6-b7f5-eedcc5d898c7/the-applicationspecific-permission-settings-do-not-grant-local-activation-permission-for-the-com
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In addition, if there are any further requirements regarding SQL, here are some SQL forums below for you:
https://social.technet.microsoft.com/Forums/sqlserver/en-US/home?category=sqlserver&filter=alltypes&sort=lastpostdesc
Best Regards,
Amy
Please remember to mark the replies as answers if they help and un-mark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact [email protected]

Cannot load oraclient9.dll error

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http://www.cs.bu.edu/fac/matta/Teaching/CS552/F99/proj4/
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I was that close to opening a can-o'-whup-ass on you for so poorly concealing your desire for us to do your homework, when I opened the link and realised it was due 3 and a half years ago.
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Hi
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completes the .dll call after 2X milliseconds, and thread 3 completes
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This was related to kernel level settings
The attribute max_thread_proc was set to 64 which was not enough. So increase that to 2048 and the Web-Server Instance wil start.

Ituens doesn't open. qtcf.dll error. tried everything

I updated my itunes and now I'm getting that all too popular wtcf.dll error.
first I tried to repair quicktime. nothing worked
I tried to reinstall itunes.
I uninstalled ituens and instaled it again
I uninstalled quicktime and installed that again
I downloaded a qtcf.dll file from thei nternet and put on my desktop, in the Windows foldar, and also in the system32 folder.
nothing has worked so far. I also get a startup error too related to ituneshelper.exe

I downloaded a qtcf.dll file from thei nternet and put on my desktop, in the Windows foldar, and also in the system32 folder.
Let's first remove those three files, tidus. Having a QTCF.dll lurking about in unorthodox places on the PC can actually cause errors.
I also get a startup error too related to ituneshelper.exe
That suggests you're getting a rare version of the QTCF.dll error caused by a damaged Apple Application Support. (If AAS is broken, sometimes iTuneshelper isn't able to launch either.)
Let's try the procedure I suggest to fizzylove in the following thread:
http://discussions.apple.com/message.jspa?messageID=10918603#10918603
Does that help with the QTCF.dll?

Trouble rationalizing use of multi-threading in run of the mill servlets

Hey everybody,
While spending time writing an internal wiki article on servlets for work, I asked myself a very basic question: What does multi-threading buy average servlets where the business logic requires procedural handling of the request?
Don't get me wrong: I appreciate the fact that servlet containers spawning a new thread being less expensive than spawning an entirely new process is helpful and efficient. Coming from a background in PHP, it is great how servlets maintain persistence. However, as more of my coworkers are required to gain proficiency in Java and designing servlets, it is a question that many will ask and aside from having real-time processing of data files and other arduous tasks, I cannot think of any instances of where multi-threading benefits the application.
What are some of the ways that you are using multi-threading with web applications?
How would you explain why and where you would want to use multi-threading to someone?
Thank you in advance for your insight,
Andy

how can we pass arguments to the run ()method?Create classes which implement Runnable that take your runtime parameters as constructor arguments and store them.
eg: if your single thread method is static void foo (int quantity, String name) {
    for (int i=0; i<quantity; i++) {
      System.out.println(name);
// caller code
foo(7, "wombats");Then you can make a runnable implementation thus:public class Foo implements Runnable {
final int quantity_;
final String name_;
public Foo (int quantity, String name) {
    quantity_ = quantity;
    name_ = name;
public void run () {
    for (int i=0; i<quantity_; i++) {
      System.out.println(name_);
// caller code
new Thread(new Foo(7, "wombats")).start();
You could overload this method to take parameters in
your class that implements the Runnable interface,
and then call the base run() method.I don't get what you mean by this; Runnable is an interface so there is no base class run() method, and a run() overloaded with extra parameters method wouldn't get called by the thread.
Pete

Found Dead Multi-Threaded Server Error!!!

I am in the process of testing an application based on EJBs deployed on an Oracle 8.1.5 database.
Some times the whole instance chashes without any obvious reason.
The error reported in the Alert file is
"found dead multi-threaded server 'SOOO',pid(8,1). Terminating Instance".
I check my code and i think that there is no problem with cleaning up resources. I increased also the JAVA_POOL_SIZE and LARGE_POOL_SIZE size without any result.
Can anybody give me a hint for the error cause?
Thanks in advance.
null

go on metalink http://metalink.oracle.com
Good Luck,
Fred

Multi-thread failure - Error in assignment

Hello
I have a c++ program processor running under Windows XP with Oracle 9i. My program access to oracle by an ODBC driver version 9.2.0.4.0. It could be launched in multi-thread to increase performance. When I launch it with one thread everything is fine. When I use several threads I have problems. ODBC driver returns to me a "error in assignment ... General error" message and my updates queries failed. Under SQl server it works without problems. It seems to be a kind of deadlock. When I disable check box in my odbc driver of "enable query timeout" my program encounter a problem and freezes...
Could someone help me ?

user13335017 wrote:
I have thought of the above solutions as workable, however, it is not. Some exhibited errors are:
A. "Attempt to use database while environment is closed." This error applies to 2, 3 and 4 all the way;
B. "Attempt to read / write database while database is closed." This error applies to 3 in particular;
C. "Attempt to close environment while some database is still open." This error applies to 5.
Please help me with designing a better strategy to solve the concurrent issue. Many thanks in advance.All these are expected errors. You should design the application so that you do not close an environment handle while database handles are still open, keep database handles open for as long as operations need to be performed on the underlying databases, open the database handles after opening the database handles, and close database handles before closing the environment handle.
In short, in pseudo-code, you should have something like this:
- open environment handle,
- open database handles,
- perform whatever operations are needed on the databases,
- close database handles,
- close environment handle.
You can refer to the Getting Started with Data Storage and the Getting Started with Transaction Processing guides appropriate for the API you are using, from the Berkeley DB documentation page.
Regards,
Andrei

Found dead multi-threaded server

hi all
My database is not running in multithread mode.
mts_dispatchers = "(protocol=TCP)"
I am getting such error
found dead multi-threaded server 'S000', pid = (8, 4)
Pl guide me
suresh

go on metalink http://metalink.oracle.com
Good Luck,
Fred

Oraclient9i.dll error in multi threaded delphi server application

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