Help with Thread dump analisys

We have problems with our application which runs on bea8.1 sp1.
Problem is that bea runs out from Threads (StuckThreads).
thread dums look same for all threads but i can's see what is wrong.
Here are dumps from first and last threads :
"ExecuteThread: '1' for queue: 'weblogic.kernel.Default'" daemon prio=5 tid=0x7f3628
nid=0xd runnable [a6280000..a6281994
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:183)
at java.io.BufferedInputStream.read(BufferedInputStream.java:201)
- locked <c3197aa0> (a java.io.BufferedInputStream)
at java.io.DataInputStream.readByte(DataInputStream.java:276)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:189)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
at com.hutchison3g.core.product.homebase.services.HomebaseFactoryImpl_Stub.getIdentity(Unknown
Source)
at com.hutchison3g.core.product.homebase.client.HomebaseClient.getIdentity(HomebaseClient.java:207)
at com.hutchison3g.core.product.homebase.client.util.HomebaseProxy.getIdentity(HomebaseProxy.java:78)
at com.hutchison3g.core.product.homebase.client.util.UserUtil.getIdentity(UserUtil.java:132)
at com.hutchison3g.core.product.homebase.servlets.TalonUniServlet.doGet(TalonUniServlet.java:181)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at com.hutchison3g.core.product.homebase.client.servlet.core.HomebaseCommonServlet.service(HomebaseCommonServlet.
java:72)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1053)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:387)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:305)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6310)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:317)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3622)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2569)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
"ExecuteThread: '24' for queue: 'weblogic.kernel.Default'" daemon prio=5 tid=0x6dd548
nid=0x24 runnable [a3d80000..a3d819
94]
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:183)
at java.io.BufferedInputStream.read(BufferedInputStream.java:201)
- locked <c30c5010> (a java.io.BufferedInputStream)
at java.io.DataInputStream.readByte(DataInputStream.java:276)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:189)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
at com.hutchison3g.core.product.homebase.services.HomebaseFactoryImpl_Stub.getIdentity(Unknown
Source)
at com.hutchison3g.core.product.homebase.client.HomebaseClient.getIdentity(HomebaseClient.java:207)
at com.hutchison3g.core.product.homebase.client.util.HomebaseProxy.getIdentity(HomebaseProxy.java:78)
at com.hutchison3g.core.product.homebase.client.util.UserUtil.getIdentity(UserUtil.java:132)
at com.hutchison3g.core.product.homebase.servlets.TalonUniServlet.doGet(TalonUniServlet.java:181)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at com.hutchison3g.core.product.homebase.client.servlet.core.HomebaseCommonServlet.service(HomebaseCommonServlet.
java:72)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1053)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:387)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:305)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6310)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:317)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3622)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2569)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)

Rob Woollen <[email protected]> wrote:
Can you post the full thread dump?
It looks like you have some code making an RMI call over the network.
Is it calling another server, or perhaps a loopback call into the same
server. The latter (opening a socket to your own process) is a good
way
to get a deadlock.
-- Rob
dara wrote:
We have problems with our application which runs on bea8.1 sp1.
Problem is that bea runs out from Threads (StuckThreads).
thread dums look same for all threads but i can's see what is wrong.
Here are dumps from first and last threads :
"ExecuteThread: '1' for queue: 'weblogic.kernel.Default'" daemon prio=5tid=0x7f3628
nid=0xd runnable [a6280000..a6281994
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:183)
at java.io.BufferedInputStream.read(BufferedInputStream.java:201)
- locked <c3197aa0> (a java.io.BufferedInputStream)
at java.io.DataInputStream.readByte(DataInputStream.java:276)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:189)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
at com.hutchison3g.core.product.homebase.services.HomebaseFactoryImpl_Stub.getIdentity(Unknown
Source)
at com.hutchison3g.core.product.homebase.client.HomebaseClient.getIdentity(HomebaseClient.java:207)
at com.hutchison3g.core.product.homebase.client.util.HomebaseProxy.getIdentity(HomebaseProxy.java:78)
at com.hutchison3g.core.product.homebase.client.util.UserUtil.getIdentity(UserUtil.java:132)
at com.hutchison3g.core.product.homebase.servlets.TalonUniServlet.doGet(TalonUniServlet.java:181)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at com.hutchison3g.core.product.homebase.client.servlet.core.HomebaseCommonServlet.service(HomebaseCommonServlet.
java:72)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1053)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:387)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:305)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6310)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:317)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3622)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2569)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
"ExecuteThread: '24' for queue: 'weblogic.kernel.Default'" daemon prio=5tid=0x6dd548
nid=0x24 runnable [a3d80000..a3d819
94]
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:183)
at java.io.BufferedInputStream.read(BufferedInputStream.java:201)
- locked <c30c5010> (a java.io.BufferedInputStream)
at java.io.DataInputStream.readByte(DataInputStream.java:276)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:189)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
at com.hutchison3g.core.product.homebase.services.HomebaseFactoryImpl_Stub.getIdentity(Unknown
Source)
at com.hutchison3g.core.product.homebase.client.HomebaseClient.getIdentity(HomebaseClient.java:207)
at com.hutchison3g.core.product.homebase.client.util.HomebaseProxy.getIdentity(HomebaseProxy.java:78)
at com.hutchison3g.core.product.homebase.client.util.UserUtil.getIdentity(UserUtil.java:132)
at com.hutchison3g.core.product.homebase.servlets.TalonUniServlet.doGet(TalonUniServlet.java:181)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at com.hutchison3g.core.product.homebase.client.servlet.core.HomebaseCommonServlet.service(HomebaseCommonServlet.
java:72)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1053)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:387)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:305)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6310)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:317)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3622)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2569)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
Thanks Rob,
sorry for delay but I was on vacation.
You are right about RMI, our app. consist from FE (front end) and BE (back end),
comunication between them is RMI.
We had some problems with BE but now we have new version and it looks ok.
Anyway thanks for help, if I will have again some problems then it will be
Help with thread analisys 2 ;-)

Similar Messages

Help with Threads

I need help with threads. How can I break this code into teo threads without chaning the data objects at all? Producer will produce string line by line and consumer will take the line and search for the word. Help me please.
Thank you
public class WordFinder
* Main program opens the file given by the user as an argument and
* searches for the word given by the user. If the word is found,
* the line number on which the word occurs is displayed.
* @param args[0] Word to search for
* @param args[1] Name of file to search
public static void main(String[] args) throws IOException
// To keep track of how long the program runs we'll set the startTime
// variable to the current time in milliseconds and use that at
// the end of the program to find out how long we ran.
long startTime = System.currentTimeMillis();
String wordToFind;
String currentLine;
int lineCount = 0; // Keep track of line numbers
BufferedReader inputFile = null; // Needed to get compiler to quit
// complaining about uninitialized
// variables.
// Make sure we have 2 arguments passed to us
if (args.length < 2)
// Nope. Show user how to run and then exit with an error (1)
System.out.println("usage: java WordFinder <word> <file pathname>");
System.exit(1);
// So far, so good. Now try to open the file the user gave us as
// a parameter. We'll use a BufferedReader object to read the file
// so we can read one line at a time from the input. If opening the
// file fails, print an error message and exit with an error (1).
try
inputFile = new BufferedReader(new FileReader(args[1]));
catch (FileNotFoundException e)
System.out.println(args[1] + ": File not found or is not readable");
System.exit(1);
// Set the wordToFind variable to refer to args[0]. We don't
// really need to do this, but it makes our code more readable
wordToFind = args[0];
// We're going to read the file one line at a time. For each
// line, we'll create a StringTokenizer object to break the line
// into distinct words, checking each word to see if it's the same
// as the given search word.
// Read first line from the file
currentLine = inputFile.readLine();
while (currentLine != null) // Repeat until we reach EOF
// Have a valid input line, increment the counter
lineCount++;
// Create a StringTokenizer object over the current line
StringTokenizer tokens = new StringTokenizer(currentLine);
// Check each word in the string by accessing each token
while (tokens.hasMoreTokens())
// See if the next word is the one we're looking for and
// advance the token iterator to the next token
if (wordToFind.equals(tokens.nextToken()))
// Yes, display the current line number
System.out.println(wordToFind + " found on line " + lineCount);
// Read next line from the file
currentLine = inputFile.readLine();
} // while
// Done with the input file
inputFile.close();
// Display the running time of this program in milliseconds by
// subtracting the start time from the current time
System.out.println((System.currentTimeMillis() - startTime) + " milliseconds");
} // main
} // WordFinder

You may create Queue object. (I guess that you're already know QUEUE)
Then ... use producer thread to load input file into queue. (Enqueue)
Consumer ... dequeue
Queue can be empty because of
- Input file was read to EOF and Consumer had produced all queue.
or
- Cunsumer works too fast... So the queue is empty.
So, you may have to use ... wait() in Consumer in case of the queue is empty.
And use notify() in Producer to wake up consumer ...
Is this right ?

Need help with threads?.. please check my approach!!

Hello frnds,
I am trying to write a program.. who monitors my external tool.. please check my way of doing it.. as whenever i write programs having thread.. i end up goosy.. :(
first let me tell.. what I want from program.. I have to start an external tool.. on separate thread.. (as it takes some time).. then it takes some arguments(3 arguments).. from file.. so i read the file.. and have to run tool.. continously.. until there are arguments left.. in file.. or.. user has stopped it by pressing STOP button..
I have to put a marker in file too.. so that.. if program started again.. file is read from marker postion.. !!
Hope I make clear.. what am trying to do!!
My approach is like..
1. Have two buttons.. START and STOP on Frame..
START--> pressed
2. check marker("$" sign.. placed in beginning of file during start).. on file..
     read File from marker.. got 3 arg.. pass it to tool.. and run it.. (on separate thread).. put marker.. (for next reading)
     Step 2.. continously..
3. STOP--> pressed
     until last thread.. stops.. keep running the tool.. and when last thread stops.. stop reading any more arguments..
Question is:
1. Should i read file again and again.. ?.. or read it once after "$" sign.. store data in array.. and once stopped pressed.. read file again.. and put marker ("$" sign) at last read line..
2. how should i know when my thread has stopped.. so I start tool again??.. am totally confused.. !!
please modify my approach.. if u find anything odd..
Thanks a lot in advance
gervini

Hello,
I have no experience with threads or with having more than run "program" in a single java file. All my java files have the same structure. This master.java looks something like this:
---master.java---------------------------------------------------
import java.sql.*;
import...
public class Master {
public static void main(String args []) throws SQLException, IOException {
//create connection pool here
while (true) { // start loop here (each loop takes about five minutes)
// set values of variables
// select a slave process to run (from a list of slave programs)
execute selected slave program
// check for loop exit value
} // end while loop
System.out.println("Program Complete");
} catch (Exception e) {
System.out.println("Error: " + e);
} finally {
if (rSet1 != null)
try { rSet1.close(); } catch( SQLException ignore ) { /* ignored */ }
connection.close();
-------end master.java--------------------------------------------------------
This master.java program will run continuously for days or weeks, each time through the loop starting another slave process which runs for five minutes to up to an hour, which means there may be ten to twenty of these slave processes running simultaneously.
I believe threads is the best way to do this, but I don't know where to locate these slave programs: either inside the master.java program or separate slave.java files? I will need help with either method.
Your help is greatly appreciated. Thank you.
Logan

Need some help with threads...

Hello all,
I am working on a project at work, and I am not the best programmer in the world. I have been trying to get my head around this for a couple of days and just cannot get it to work.
I am writing an instrumentation control program that will have three threads. One is the GUI, one will receive control information and set up the hardware, and one will check the hardware status and report it to the GUI periodically. I plan on using the invokeLater() method to communicate the status to the GUI and change the status display in the GUI. Communication from the GUI to the controller thread and from the status thread to the controller thread I had planned on being piped input/output stream as appropriate. I have a control class and a status class that need to be communicated over these piped streams. In some trial code I have been unable to wrap the piped input/output streams with object input/output streams. I really need some help with this. Here is the main thread code:
package playingwiththreads1;
import java.io.*;*
*public class PlayingWithThreads1 {*
public static void main(String[] args) {*
* PipedOutputStream outputPipe = new PipedOutputStream();*
* ObjectOutputStream oos = null;*
* ReceiverThread rt = new ReceiverThread(outputPipe);*
// Start the thread -- First try*
* Thread t = new Thread(rt);*
t.start();*
// Wrap the output pipe with an ObjectOutputStream*
try*
oos = new ObjectOutputStream(outputPipe);*
catch (IOException e)*
System.out.println(e);*
// Start the thread -- Second try*
//Thread t = new Thread(rt);*
//t.start();*
/** Send an object over the pipe. In reality this object will be a
class that contains control or status information */
try
if (!oos.equals(null))
oos.writeObject(new String ("Test"));
catch (IOException e)
try
Thread.sleep(5000);
catch (InterruptedException e)
I read somewhere that it matters where you start the thread relative to where you wrap piped streams with the object streams. So, I tried the two places I felt were obvious to start the thread. These are noted in the comments. Here is the code for the thread.
package playingwiththreads1;
import java.io.*;
public class ReceiverThread implements Runnable {
private PipedInputStream inputPipe = new PipedInputStream();
private ObjectInputStream inputObject;
ReceiverThread (PipedOutputStream outputPipe)
System.out.println("Thread initialization - start");
try
inputPipe.connect(outputPipe);
inputObject = new ObjectInputStream(inputPipe);
catch (IOException e)
System.out.println(e);
System.out.println("Thread initialization - complete");
public void run()
System.out.println("Thread started");
try
if (inputObject.available() > 0)
System.out.println(inputObject.read());
catch (IOException e)
System.out.println(e);
Through testing I have determined that no matter where I start the thread, the thread never gets past the "inputObject = new ObjectInputStream(inputPipe);" assignment.
Could someone please help me with this? There are other ways for me to write this program, but this is the one that I would like to make work.
Many thanks in advance,
Rob Hix
Edited by: RobertHix on Oct 6, 2009 3:54 AM

Thanks for the help, but that did not work. I tried flushing the ObjectOutputStream and it is still hanging when initializing the thread.
Here is a better look at the code since I was helped to figure out how to insert it:
The main method:
package playingwiththreads1;
import java.io.*;
public class PlayingWithThreads1 {
    public static void main(String[] args) {
        PipedOutputStream outputPipe = new PipedOutputStream();
        ObjectOutputStream oos = null;
        ReceiverThread rt = new ReceiverThread(outputPipe);
        // Start the thread -- First try
        //Thread t = new Thread(rt);
        //t.start();
        // Wrap the output pipe with an ObjectOutputStream
        try
            oos = new ObjectOutputStream(outputPipe);
            oos.flush();
        catch (IOException e)
            System.out.println(e);
        // Start the thread -- Second try
        Thread t = new Thread(rt);
        t.start();
        /* Send an object over the pipe. In reality this object will be a
         * class that contains control or status information */
        try
            if (!oos.equals(null))
                oos.writeObject(new String ("Test"));
                oos.flush();
        catch (IOException e)
            System.out.pringln(e);
        try
            Thread.sleep(5000);
        catch (InterruptedException e)
}The thread code:
package playingwiththreads1;
import java.io.*;
public class ReceiverThread implements Runnable {
    private PipedInputStream inputPipe = new PipedInputStream();
    private ObjectInputStream inputObject;
    ReceiverThread (PipedOutputStream outputPipe)
        System.out.println("Thread initialization - start");
        try
            inputPipe.connect(outputPipe);
            inputObject = new ObjectInputStream(inputPipe);
        catch (IOException e)
            System.out.println(e);
        System.out.println("Thread initialization - complete");
    public void run()
        System.out.println("Thread started");
        try
            if (inputObject.available() > 0)
                System.out.println(inputObject.read());
        catch (IOException e)
            System.out.println(e);
}Does anyone else have and ideas?

Wanted: Help with thread in spanish; guitar not recording

Can someone please help with this thread?
GarangeBand No Reconoce Mi Guitarra Audio
The op has trouble to connect his guitar. I cannot interview him in spanish, and he does not know to ask in English.
Appriciate any help.
Léonie

Hi Borris12,
I'll clear this up for you and let you know whats happened.
Could you drop me in an email please with your BT account and telephone number along with a link back to this thread.
Just send to the email address in my profile and mark FAO Craig please.
Thx
Craig
BTCare Community Mod
If we have asked you to email us with your details, please make sure you are logged in to the forum, otherwise you will not be able to see our ‘Contact Us’ link within our profiles.
We are sorry but we are unable to deal with service/account queries via the private message(PM) function so please don't PM your account info, we need to deal with this via our email account :-)”
td-p/30">Ratings star on the left-hand side of the post.
If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.

Need some help with threads, urgent!!

Hi I am really new to threads and I cannot figure out why the code below will not work. After my thread goes into a wait, it never wakes up. Can someone please help me? When stepping through the code, I get an invalid stack frame message as well. Thanks in Advance!!!
Colin
import java.io.*;
import java.util.*;
public class XMLInputCompression extends InputStream implements Runnable
private InputStream in;
private ByteArrayOutputStream baos = new ByteArrayOutputStream();
private boolean closed = false;
private boolean foundDTD = false;
private Vector elementsList = new Vector();
private Vector attributesList = new Vector();
private BufferedReader br = null;
private StringTokenizer st = null;
final static int BUFF_SIZE = 500;
final static String HEADER = "<?xml version=\"1.0\"?><!DOCTYPE Form SYSTEM ";
final static char CLOSE_ELEMENT = '>';
final static String END_ELEMENT = ">";
final static char START_ELEMENT = '<';
final static char START_ATTRIBUTE = '[';
final static String ATTLIST = "<!ATTLIST";
final String XMLTAG ="<?xml";
final String ELEMENTTAG = "<!ELEMENT";
public static void main(String[] args)
 try
FileInputStream fis = new FileInputStream("c:/Dump.txt");
XMLInputCompression compress = new XMLInputCompression(fis);
int r = 0;
while(r != -1)
byte b[] = new byte[200];
r = compress.read(b);
System.out.println("r is: " + r);
if( r == -1)
compress.close();
}catch(Exception e)
e.printStackTrace();
} // end main
public XMLInputCompression(InputStream is) throws IOException
this.in = is;
baos.write(HEADER.getBytes());
new Thread(this).start();
public void run()
try
Vector elementNames = new Vector();
//Vector attributeNames = new Vector();
StringBuffer sb = new StringBuffer(BUFF_SIZE);
char c = (char)in.read();
switch (c)
case START_ELEMENT:
if (!foundDTD)
wakeUp(sb.toString().getBytes());
//populate the elements and atrributes vectors
FileInputStream fis = new FileInputStream("C:/form.dtd");
processDTDElements(fis);
foundDTD = true;
sb.setLength(0);
else
sb.append("<");
String element = (String)elementsList.get((int)in.read());
elementNames.addElement(element);
sb.append(element);
wakeUp(sb.toString().getBytes());
//baos.write(sb.toString().getBytes());
sb.setLength(0);
break;
case START_ATTRIBUTE:
sb.append("[");
sb.append(attributesList.get((int)in.read()));
wakeUp(sb.toString().getBytes());
//baos.write(sb.toString().getBytes());
sb.setLength(0);
break;
case CLOSE_ELEMENT:
wakeUp(sb.toString().getBytes());
//baos.write(sb.toString().getBytes());
sb.setLength(0);
sb.append(elementNames.get(0));
elementNames.remove(0);
sb.append(">");
break;
default:
sb.append(c);
synchronized (baos)
baos.notify();
System.out.println(" in run method*****");
}catch(Exception e)
e.printStackTrace();
} // end run
private void wakeUp(byte b[])
System.out.println(" in wakeup method*****");
synchronized (baos)
try
baos.write(b);
catch(Exception e)
System.out.println("exception caught");
e.printStackTrace();
baos.notify();
public boolean markSupported()
return false;
public int read(byte[] b1, int off, int len) throws IOException
return readData(b1, off, len);
public int read() throws IOException
return readData(null, 0, 1);
public int read(byte[] b1) throws IOException
return readData(b1, 0, b1.length);
private int readData(byte[] b1, int off, int len) throws IOException
String s = null;
while(true)
if (closed && baos.size() == 0)
return -1;
int size = baos.size();
if (baos.size() > 0) // Have at least one byte
if( b1 == null)
byte b[] = baos.toByteArray();
baos.reset();
baos.write(b, 1, b.length-1); // baos contains all data except b[0]
return b[0];
else
int minLen = Math.min(baos.size(), len);
//System.out.println(" baos contents are: " + baos.toString());
byte b[] = baos.toByteArray();
s = b.toString();
int length = baos.size() - minLen;
baos.reset();
baos.write(b, 0, length );
System.arraycopy(b, 0, b1, off, minLen);
return minLen;
try
synchronized (baos)
if (!closed)
baos.wait();
catch(java.lang.InterruptedException ie)
ie.printStackTrace();
}// end read data
private boolean hasMoreTokens()
String s = null;
try
if (br != null)
if (st == null || !st.hasMoreTokens())
// read in a line, create a st
s = br.readLine();
st = new StringTokenizer(s,"\n\r\t ");
}catch(Exception e)
e.printStackTrace();
return st.hasMoreTokens();
private String nextToken() throws Exception
String token = null;
if(st.hasMoreTokens())
token = st.nextToken();
}else
String s = br.readLine();
st = new StringTokenizer(s,"\n\r\t ");
token = st.nextToken();
return token;
private void processDTDElements(FileInputStream is)
try
 // get the file desriptor from the input Stream
 FileDescriptor fd = is.getFD();
 // create a new buffered reader
br = new BufferedReader(new FileReader(fd));
boolean lookForEndTag=false;
boolean lookForEndAtt=false;
while (hasMoreTokens())
String token = nextToken();
if (lookForEndTag)
if (!token.endsWith(END_ELEMENT))
continue;
}else
lookForEndTag = false;
continue;
if (token.startsWith(XMLTAG))
lookForEndTag = true;
else if (token.startsWith(ELEMENTTAG))
token = nextToken();
if ( elementsList.indexOf(token)<0)
elementsList.addElement(token);
lookForEndTag = true;
else if (token.startsWith(ATTLIST))
String dummy = nextToken(); // discard element name
do
token = nextToken();
if (token.endsWith(">"))
break;
if (attributesList.indexOf(token)<0 )
attributesList.addElement(token);
token = nextToken();
if ( token.startsWith("CDATA") || token.startsWith("ID") )
token = nextToken();
if (token.equals("#FIXED "))
token = nextToken();
lookForEndAtt = token.endsWith(END_ELEMENT);
else if ( token.startsWith("(") )
do
token = nextToken();
}while ( token.indexOf (")") == -1);
token = nextToken();
lookForEndAtt = token.endsWith(END_ELEMENT);
} while (!lookForEndAtt);
}//end if
}//end while
}catch(Exception e)
e.printStackTrace();
}finally
try
br.close();
}catch(Exception e)
e.printStackTrace();
}// end process elements
public void close() throws IOException
closed = true;
synchronized(baos)
baos.notify();
}// end XMLinputCompression class

Your problem probably has something to do with where you tell baos (or rather, the thread that it is in) to wait. You have:synchronized (baos)
 if (!closed)
 baos.wait();
}Which acquires a lock on baos, then tells its own thread to wait without ever relinquishing its lock on baos. So when your main method calls the read method, it hangs immediately when it tries to access baos because it is still locked. So what you're seeing is a basic deadlock condition.
Really, you're not gaining anything with your multithreading in this case. But that's a different issue.

Need help with Threading GUI progress bar

Anyone able to help? I'm sure you've seen this a million times. I've google'd around and tried examples but still can't get a progress bar to work properly under the following situation:
1. Created a panel with several components to select directory, display directory in tree etc.
2. When a specific button (Search) is clicked, I want a secondary window to popup and report progress of searching down the directory.
As you'll probably guess, the progress window isn't being updated until the end. I'm using Threads and using InvokeLater but nothing happens. Is there any good example that does the above? I can't seem to find one to figure this out.
Thanks
Speedy.
Sample code:
main.java:
========
public class Main {
public static void main(String[] args) {
MainPanel mainPanel = new MainPanel();
mainPanel.show();
MainPanel.java:
============
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
public class MainPanel extends JFrame implements ActionListener {
public MainPanel() {
this.setSize(100,100);
JButton startButton = new JButton("Start");
this.getContentPane().add(startButton);
startButton.addActionListener(this);
public void actionPerformed(ActionEvent event) {
ProgressPanel pp = new ProgressPanel();
pp.show();
SimpleTask st = new SimpleTask(pp);
st.start();
while (st.isAlive()) {
System.err.println("waiting..");
try {
Thread.sleep(100);
} catch (Exception e) {};
System.err.println("finished!");
SimpleTask.java:
=============
import javax.swing.SwingUtilities;
public class SimpleTask extends Thread {
ProgressPanel pp = null;
public SimpleTask(ProgressPanel _pp) {
pp = _pp;
this.setDaemon(true);
int i = 0;
String position = "";
public void run() {
Runnable updateGUI = new Runnable() {
public void run() {
pp.setText(position);
try {
for (i=0; i<50; i++) {
position = "Now on = " + new Integer(i).toString();
System.err.println(position);
SwingUtilities.invokeLater(updateGUI);
sleep(100);
} catch (Exception e) {}
ProgressPanel.java:
===============
import javax.swing.JFrame;
import javax.swing.JLabel;
public class ProgressPanel extends JFrame {
private JLabel label = new JLabel();
public ProgressPanel() {
this.setSize(200,200);
this.setLocation(100,100);
this.getContentPane().add(label);
setText("Start");
public void setText(String text) {
label.setText(text);
}

Ok, I'll look down that road. I should have said the Thread is being used because the current while loop will be changed to perform real work. Just an example at the moment to show what I'm trying to do. Does this make a difference? The real task will be to drill down directories, counting file types/dirs etc...

Help with Threads in java...

Hi all,
the problem it's the following:
i got a program that update a sql server table. So i want, at the same time, run this program many times, say 10 for example, to do it that faster.
But i only want 10 subprograms at the same time. So i got to use wait() and others method's, rigth?
I'm not shure about this, because a never use threads.
So any help, code or "pseudocode" will be very appreciated.
Thanks in advance
A. Santos

Hi santhos,
If u use 10 threads to read the sql table, then
ur program will lose the sequence. If u have a idea
to split the program then u can use threads.
Regards,
Palaniyappan

Please ..... Help with Threads

I got the same problem that sun_fade has which is related to running a program behind the scene ..... this the topic that sun_fade issued
((((((Am currently working on a small java project which run through a unix terminal ... my program take some time (about 20 seconds ) to do some checking and calculations... My question is that when I run this program I need to wait for this 20 seconds or what ever my program take and after that I will get the result ... what I want is to make the control go back to system so i can issue some commands and do some stuff and when the program is done I will get the result .... exactly when you issue >>>> httpd start and you press enter ....
Thanks in advance )))))
and some guys answers that we can do such a thing by using a Threads ..... so what I want is just a simple program that type a message like "" hello Dude """ after 2 minutes ,showing this message on the terminal and also during this time the control is back to the system so I can issue some commands and after time elapsed the message will appear .....
for example---
bash:- java hellodude
bash:- // and I can do what I want issuing commands what ever ..... etc
when 2 minutes elapsed
Hello dude
bash:-
Thanks

sunfade wrote:
I got the same problem that sun_fade hasBecause you are him.
((((((Am currently working on a small java project which run through a unix terminal ... my program take some time (about 20 seconds ) to do some checking and calculations... My question is that when I run this program I need to wait for this 20 seconds or what ever my program take and after that I will get the result ... what I want is to make the control go back to system so i can issue some commands and do some stuff and when the program is done I will get the result .... exactly when you issue >>>> httpd start and you press enter ....
Thanks in advance )))))
and some guys answers that we can do such a thing by using a Threads ..... so what I want is just a simple program that type a message like "" hello Dude """ after 2 minutes ,showing this message on the terminal and also during this time the control is back to the system so I can issue some commands and after time elapsed the message will appear ..... You're still not explaining your problem well at all.
>
for example---
bash:- java hellodude
bash:- // and I can do what I want issuing commands what ever ..... etc
when 2 minutes elapsed
Hello dude
bash:- There are two ways two do that. You've already been told one. I'm not going to tell you the other one because I don't like your attitude.
I will tell you this, though: That's probably a stupid thing to do. I don't want some output from a previous command popping out in the middle of other work I'm doing. If I really do, I'll explicitly say so with &.
Actually, now that I think about it, the second way might not work anyway.
There's a third way though, but it will be heinously ugly. The only sensible way to do that is to use &. A more sensible way would be, as sabre suggested, to use a separate terminal

Help with core dump.

We have a Tomcat app that is hanging every 3-4 days. I know this is off-topic, but I'd appreciate any help in resolving this. I've posted the JVM dump on my web page at http://web.bvu.edu/staff/david/jvmdmp.txt
Additional details:
JDK 1.4.2_08 on Windows Server 2003 Enterprise, Tomcat 5.0.28
The web app runs agains MySQL 4.0.26 which is on a separate server, also Windows Server 2003 Enterprise. We're using the MySQL 3.1.10 connector.
The hangs happen on each version of Tomcat (4.1.31, 5.0.28, 5.5.9), MySQL (4.0.26, 4.1.15), and Java (1.4.2, 1.5) we've tried. No errors being reported on the MySQL side of things, and no unusual Exceptions in the Tomcat/JVM logs.

[http://java.sun.com/javase/6/webnotes/trouble/TSG-VM/html/crashes.html]

Need help with threading in Swing GUI !!!

I've written an app that parses and writes
files. I'm using a Swing GUI. The app
could potenially be used to parse hundreds or even
thousands of files. I've included a JProgressBar
to monitor progress. The problem is when I parse
a large number of files the GUI freezes and only
updates the values of the progress bar when the
parsing and writing process is finished.
I assume I need to start the process in a seperate thread. But, I'm new to threads and I'm not sure
whether to start the Progressbar code in a seperate
thread or the parsing code. As a matter of fact I really
don't have any idea how to go about this.
I read that Swing requires repaints be done in the
event dispatch thread. If I start the parsing in a seperate
thread how do I update the progressbar from the other
thread? I'm a thread neophyte.
I need a cigarette.

In other words do this:
Inside event Thread:
handle button action
start thread
return from action listener
Inside worker Thread:
lock interface
loop
perform action
update progress bar
unlock interface
return from worker ThreadDoesn't updating the progress bar (and locking/unlocking the interface components) from within the worker thread violate the rule that you shouldn't mess with Swing components outside the event thread? (Do I have that rule right?)
In any case, is there any way to just post some kind of event to the progress bar to update it from within the worker thread, thereby insuring that the GUI progress bar update is being invoked from the event thread? This would also obviate the need to use a timer to poll for an update, which I think is a waste especially when the monitored progress is at a variable rate, (or for number crunching, is executing on different speed machines).
Also, doesn't using invokeLater() or invokeAndWait() still block the event dispatching thread? I don't understand how having a chunk of code started in the event thread doesn't block the event thread unless the code's executed in a "sub-thread", which would then make it not in the event thread.
I'm also looking to have a progress bar updated to monitor a worker thread, but also want to include a "Stop" button, etc. and need the event queue not to be blocked.
The last thing I can think of is to implement some kind of original event-listener class that listens to events that I define, then register it with the system event queue somehow, then have the worker thread post events to this listener which then calls setValue() in the progress bar to insure that the bar is updated from the event queue and when I want it to be updated. I don't know yet if it's possible to create and register these kinds of classes (I'm guessing it is).
Thanks,
Derek

Help with Threads for a webserver

That is the main class of my webserver. The problem is that after executing one petition the server closes with exit status 1. Normally that should never happens as it does not happen at the single-threaded server. Any suggestions ??
Also do i have to impement monitors, meaning syncronized functions to monitor buffers and some static variables ?
This is my first program impementing threads so really i do not experience over it
package jhttp_server;
import java.io.*;
import java.net.*;
import java.lang.*;
* Title: JHTTP_server
* Description: A simple HTTP server implemented with Java
* Copyright: Copyright (c) 2004 - Lisenced under GPL
* Company: Universidad Rey Juan Carlos
* @author Panayiotis Papadopoulos -> [email protected]
* @version 0.1
public class jserver {
static ServerSocket serverSocket = null;
static PrintWriter out;
static BufferedReader in;
static Socket client = null;
static short i=0;
static int port;
static boolean newSock=true;
public static void main(String[] args) throws IOException {
port = Integer.valueOf(args[0]).intValue();
try {
serverSocket = new ServerSocket(port);
catch (IOException e) {
System.out.println("Must Enter a port number");
System.out.println("|------------------------------------------------------------------------|");
System.out.println("|JHTTP Server initialized and accepting connections on port:" +
serverSocket.getLocalPort()+"\t |");
System.out.println("|------------------------------------------------------------------------|");
while(true){
while (i < 5) {
i++;
try {
//Creating if needed a new socket where the clients listens
if (newSock) {
client = serverSocket.accept();
in = new BufferedReader(new InputStreamReader(client.getInputStream()));
out = new PrintWriter(client.getOutputStream());
System.out.println("LOG: Client is listening on port: "+client.getPort());
//Here the server creates a new thread for the petition
petition newPet = new petition();
newPet.T.start();
} // try- create input and output buffers
catch (UnknownHostException e) {
System.err.println("JHTTP Server could establish a connection. Exiting...");
catch (IOException e) {
System.err.println("Could not get I/O for the connection to client.");
} //try - create client sockets, wait and attend connection
} //while 5 petitions
System.out.println("Session Closed. 5 continious petitions served.");
out.close();
in.close();
client.close();
newSock = true;
System.gc();
i=0;
} // while - forever
}// -------------------main-------------------
}// jserver - main class of JHTTP server project
class petition implements Runnable {
Thread T;
petition () {
T = new Thread(this);
T.start();
public void run() {
try {
//Analyse petition
Petition_Analysis.Analyse_Petition(jserver.in);
//Then Attend it
if (Petition_Analysis.pt.Version.equals("v10"))
Http_10.Attend_Petition(Petition_Analysis.pt, jserver.out, extra.detectConnectionAlive());
else if (Petition_Analysis.pt.Version.equals("v11"))
Http_11.Attend_Petition(Petition_Analysis.pt, jserver.out, extra.detectClose());
else {
jserver.out.print("HTTP/1.0 400 Bad Request\r\n\r\n");
jserver.out.close();
jserver.in.close();
jserver.client.close();
jserver.newSock = true;
//The following function immediately prints the contents of the PrinterBuffer
jserver.out.flush();
System.gc();
catch (MalformedURLException murle) {
jserver.out.print("HTTP/1.0 400 Bad Request\r\n\r\n");
try { jserver.client.close(); }
catch(IOException ioe) { System.out.println(ioe); }
jserver.newSock = true;
catch (NullPointerException npe) {}
//try - analyse petition & attend it
catch (IOException ioe){
System.out.println(ioe);
} // -- run()
} // --class: thread

Use code tags when posting code.
Given that the code you presented does not call System.exit() I am not sure how it could be exiting with a value of 1.
When you accept a connection from a client the code should do nothing but pass the client socket off to a thread and then start that thread. It should not extract the streams - do that in the thread.
The in/out streams of the client socket should be wholly contained within the thread/Runnable. They do not belong to the class that holds the SockerServer.
Your catch blocks need to be reworked. The first one completely ignores the exception and prints out that a port number is needed. You should be printing the exception message at a minimum and right now you should be be doing a printStackTrace() as well. Additionally you are ignoring a null pointer exception and that is wrong.

Creating breakout game. Need help with thread starting.

Howdy. As the title says, I've got an assignment to make a breakout game. So far it's going alright, but I've run into a rather large snag...I can't get it to animate :P I've got my main applet, then I created a class heirarchy for the paddle, ball, and brick objects. For this question, lets just focus on the ball object.
This is my applet code so far (it is not even close to being done, so don't laugh :P )
import java.awt.*;
import javax.swing.*;
import java.util.*;
* Class BreakoutApplet - Plays a simple game of Breakout.
* @author Kris Nelson
* @version November 10, 2004
public class BreakoutApplet extends JApplet implements Runnable
 protected Brick brick; // creates an object of class brick
 protected Ball ball; // creates an object of class ball
 protected Paddle paddle; // creates an object of class paddle
 protected boolean running; // tells the program whether or not the thread is running
 protected ArrayList brickArray = new ArrayList(); // stores all the bricks in the game
 protected Thread timer; // the thread which controls the animation for the applet
 * Called by the browser or applet viewer to inform this JApplet that it
 * has been loaded into the system. It is always called before the first
 * time that the start method is called.
 public void init()
 // this is a workaround for a security conflict with some browsers
 // including some versions of Netscape & Internet Explorer which do
 // not allow access to the AWT system event queue which JApplets do
 // on startup to check access. May not be necessary with your browser.
 JRootPane rootPane = this.getRootPane();
 rootPane.putClientProperty("defeatSystemEventQueueCheck", Boolean.TRUE);
 createBricks(); // creates the games array of bricks
 ball = new Ball(400, 400, 2, 2); // sets the values for the ball
 paddle = new Paddle(300, 660, 2); // sets the values for the paddle
 // !!!!!!! have tried placing ball.start() here
 * Paint method for applet.
 * @param g the Graphics object for this applet
 public void paint(Graphics g)
 // draws the background, border, and all the games objects
 g.setColor(Color.lightGray); // sets the drawing color to light gray
 g.fillRect(0, 0, 600, 700); // displays the game screens background
 displayBorder(g); // displays the game screens border
 displayBricks(g); // displays the array of bricks
 ball.display(g); // displays the ball
 paddle.display(g); // displays the paddle
 * Creates the games array of bricks
 public void createBricks()
 int colorNumber = 1; // starts the color of the bricks at orange
 double yPosition = 100; // starts the bricks y screen position at 100
 for(int i = 0; i < 4; i++)
 double xPosition = 12; // starts the bricks x screen position at 12
 for(int j = 0; j < 8; j++)
 if(colorNumber == 0)
 colorNumber = 1; // sets the color of the bricks to orange
 else
 colorNumber = 0; // sets the color of the bricks to green
 brickArray.add(brick = new Brick(xPosition, yPosition, colorNumber)); // adds a brick to the current container in the brick array
 xPosition = xPosition + brick.getWidth(); // move the bricks x screen position to the next column
 yPosition = yPosition + brick.getHeight(); // moves the bricks y screen position to the next row
 if(colorNumber == 0)
 colorNumber = 1; // sets the color of the bricks to orange
 else
 colorNumber = 0; // sets the color of the bricks to green
 * Displays the game screens border
 * @param g the Graphics object for this applet
 public void displayBorder(Graphics g)
 g.setColor(Color.black); // sets the drawing color to black
 g.fillRect(0, 0, 600, 24); // draws a border on the top of the screen
 g.fillRect(0, 0, 12, 700); // draws a border on the left of the screen
 g.fillRect(588, 0, 12, 700); // draws a border on the right of the screen
 * Displays the array of bricks on the screen
 * @param g the Graphics object for this applet
 public void displayBricks(Graphics g)
 Brick currentBrick; // holds the brick data from the current ArrayList container
 for(int i = 0; i < 32; i++)
 currentBrick = (Brick)(brickArray.get(i)); // grabs the brick data from the current ArrayList container
 currentBrick.display(g); // displays the current brick
 * Called by the browser or applet viewer to inform this JApplet that it
 * should start its execution. It is called after the init method and
 * each time the JApplet is revisited in a Web page.
 public void start()
 if(timer == null)
 timer = new Thread(this); // creates a new object of type Thread
 timer.start(); // starts the new thread
 running = true; // tells the program that the new thread is running
 * Runs the code that controls the animation
 public void run()
 do{
 repaint(); // redraws the screen
 try{
 timer.sleep(100); // puts the thread to sleep for 100 milliseconds
 } catch(InterruptedException e) {running = false;}
 // !!!!!!! have tried placing ball.start() here
 } while(running);
 timer = null; // destroys the timer thread
 * Called by the browser or applet viewer to inform this JApplet that
 * it should stop its execution. It is called when the Web page that
 * contains this JApplet has been replaced by another page, and also
 * just before the JApplet is to be destroyed.
 public void stop()
 running = false; // tells the program that the thread is now done
}These are the bits of code for my class heirarchy, just to (hopefully) make it easier to follow.
import java.awt.*;
* The parent class of all the games objects.
* @author Kris Nelson
* @version November 9, 2004
public class Sprite
 protected double screenX, screenY; // stores the x and y location of the object
 * Constructor for objects of class Sprite
 * @param xPosition the initial x screen position
 * @param yPosition the initial y screen position
 public Sprite(double xPosition, double yPosition)
 screenX = xPosition; // sets the initial x screen position
 screenY = yPosition; // sets the initial y screen position
 * Sets new x and y screen locations for an object
 * @param newX the new x screen location
 * @param newY the new y screen location
 public void setScreenXY(double newX, double newY)
 screenX = newX; // sets the new x screen location
 screenY = newY; // sets the new y screen location
 * Sends back the current x screen location
 * @return the current x screen location
 public double getScreenX()
 return screenX; // returns the current x screen location
 * Sends back the current y screen location
 * @return the current y screen location
 public double getScreenY()
 return screenY; // returns the current y screen location
import java.awt.*;
* Parent class of any game object that moves.
* @author Kris Nelson
* @version November 9, 2004
public class MovingSprite extends Sprite implements Runnable
 protected double speedX, speedY; // stores the speed of an object in the x and y directions
 protected Thread timer; // the thread which controls animation for all moving objects
 protected boolean running; // tells the program whether or not the thread is running
 * Constructor for objects of class MovingSprite
 * @param xPosition the initial x screen position
 * @param yPosition the initial y screen position
 * @param xSpeedValue the speed in the x direction
 * @param ySpeedValue the speed in the y direction
 public MovingSprite(double xPosition, double yPosition, double xSpeedValue, double ySpeedValue)
 super(xPosition, yPosition); // passes the initial screen positions to Sprite
 speedX = xSpeedValue; // sets the speed in the x direction
 speedY = ySpeedValue; // sets the speed in the y direction
 * Sends back the speed in the x direction
 * @return the speed in the x direction
 public double getSpeedX()
 return speedX; // returns the speed in the x direction
 * Sends back the speed in the y direction
 * @return the speed in the y direction
 public double getSpeedY()
 return speedY; // returns the speed in the y direction
 * Starts the thread in order to start animation
 public void start()
 if(timer == null)
 timer = new Thread(this); // creates a new object of type Thread
 timer.start(); // starts the new thread
 running = true; // tells the program that the new thread is running
 * Empty since the child objects have their own run methods
 public void run()
 * Stops the thread from running
 public void stop()
 running = false; // tells the program that the thread is now done
import java.awt.*;
* Creates a single ball who's purpose is to bounce around and destroy the bricks.
* @author Kris Nelson
* @version November 10, 2004
public class Ball extends MovingSprite
 protected static final double BALL_WIDTH = 15; // sets the width of the ball
 protected static final double BALL_HEIGHT = 15; // sets the height of the ball
 * Constructor for objects of class Ball
 * @param xPosition the initial x screen position
 * @param yPosition the initial y screen position
 * @param xSpeedValue the speed in the x direction
 * @param ySpeedValue the speed in the y direction
 public Ball(double xPosition, double yPosition, double xSpeedValue, double ySpeedValue)
 super(xPosition, yPosition, xSpeedValue, ySpeedValue); // passes the initial screen positions and ball speeds to MovingSprite
 // !!!!!!!! have tried placing timer.start() here
 * Displays a ball onto the screen
 * @param g the Graphics object for this applet
 public void display(Graphics g)
 g.setColor(Color.blue); // sets the balls color
 g.fillOval((int)(screenX), (int)(screenY), (int)(BALL_WIDTH), (int)(BALL_HEIGHT)); // displays the ball
 * Runs the code that controls the balls animation
 public void run()
 do{
 try{
 timer.sleep(100); // puts the thread to sleep for 100 milliseconds
 } catch(InterruptedException e) {running = false;}
 screenX = screenX + speedX;
 screenY = screenY + speedY; // this is VERY SIMPLE BALL MOVEMENT FOR TESTING PURPOSES, WILL BE CHANGED LATER
 } while(running);
}Sorry if that was too much code. I'm just trying to make this easier to follow.
I placed a // !!!!!!!!!!!!! comment in the places where I have tried starting the ball thread.
So basically, everything is running fine, except that I'm not at all sure of where to start the ball Thread, and thus can't start anything moving. If someone could tell me where I should be starting the thread, I would REALLY appriciate it. Thank you :D
- Kris

Some advice.
1. the start method on the ball should be called from the start method on the applet and should in turn call the start method on the sprite's thread.
2. the run method of the Moveable sprite should have been declare abstract
3. don't implement borders manually. There's a java.awt.Border class for that.
4. probably, you don't want to have the game invoke each sprite by name; just make a big list of all the sprites and invoke all of them every time
5. do you really need provision for a non-circular ball? this isn't rugby.
6. I don't think you ever had a threading problem, just a display problem.
7. Don't write comments like this: ball.display(g); // displays the ballHere's my (even more simplified version):import java.awt.*;
import javax.swing.*;
import java.util.*;
* Class BreakoutApplet - Plays a simple game of Breakout.
* @author Kris Nelson, modified by Michael Lorton
* @version November 10, 2004
public class BreakoutApplet extends JApplet implements Runnable {
 protected Ball ball;
 protected Paddle paddle;
 public boolean running; // tells the program whether or not the thread is running
 protected Thread timer; // the thread which controls the animation for the applet
 public void init() {
 // this is a workaround for a security conflict with some browsers
 // including some versions of Netscape & Internet Explorer which do
 // not allow access to the AWT system event queue which JApplets do
 // on startup to check access. May not be necessary with your browser.
 getRootPane().putClientProperty("defeatSystemEventQueueCheck",
 Boolean.TRUE);
 ball = new Ball(this, GAMEWIDTH / 2, GAMEHEIGHT / 2, 5, 5);
 public final static int GAMEWIDTH = 600;
 public final static int GAMEHEIGHT = 400;
 public void paint(Graphics g) {
 g.setColor(Color.lightGray);
 g.fillRect(0, 0,
 GAMEWIDTH, GAMEHEIGHT);
 ball.display(g); // displays the ball
 * Called by the browser or applet viewer to inform this JApplet that it
 * should start its execution. It is called after the init method and
 * each time the JApplet is revisited in a Web page.
 public void start() {
 if(timer == null) {
 timer = new Thread(this); // creates a new object of type Thread
 timer.start(); // starts the new thread
 running = true; // tells the program that the new thread is running
 ball.start();
 * Runs the code that controls the animation
 public void run() {
 do{
 repaint(); // redraws the screen
 try{
 Thread.sleep(100);
 } catch(InterruptedException e) {running = false;}
 } while(running);
 public void stop() {
 running = false;
abstract class Sprite {
 protected double screenX, screenY; // stores the x and y location of the object
 protected final BreakoutApplet parent;
 * Constructor for objects of class Sprite
 * @param xPosition the initial x screen position
 * @param yPosition the initial y screen position
 public Sprite(BreakoutApplet parent, double xPosition, double yPosition) {
 this.parent = parent;
 screenX = xPosition; // sets the initial x screen position
 screenY = yPosition; // sets the initial y screen position
 * Sets new x and y screen locations for an object
 * @param newX the new x screen location
 * @param newY the new y screen location
 public void setScreenXY(double newX, double newY) {
 screenX = newX; // sets the new x screen location
 screenY = newY; // sets the new y screen location
 * Sends back the current x screen location
 * @return the current x screen location
 public double getScreenX() {
 return screenX; // returns the current x screen location
 * Sends back the current y screen location
 * @return the current y screen location
 public double getScreenY() {
 return screenY; // returns the current y screen location
 abstract public void display(Graphics g);
* Parent class of any game object that moves.
* @author Kris Nelson
* @version November 9, 2004
abstract class MovingSprite extends Sprite implements Runnable {
 protected double speedX, speedY; // stores the speed of an object in the x and y directions
 protected Thread timer; // the thread which controls animation for all moving objects
 protected boolean running; // tells the program whether or not the thread is running
 * Constructor for objects of class MovingSprite
 * @param xPosition the initial x screen position
 * @param yPosition the initial y screen position
 * @param xSpeedValue the speed in the x direction
 * @param ySpeedValue the speed in the y direction
 public MovingSprite(BreakoutApplet parent,
 double xPosition, double yPosition,
 double xSpeedValue, double ySpeedValue) {
 super(parent, xPosition, yPosition);
 speedX = xSpeedValue; // sets the speed in the x direction
 speedY = ySpeedValue; // sets the speed in the y direction
 * Starts the thread in order to start animation
 public void start() {
 if(timer == null) {
 timer = new Thread(this); // creates a new object of type Thread
 timer.start(); // starts the new thread
 running = true; // tells the program that the new thread is running
 * Runs the code that controls the balls animation
 public void run() {
 while (parent.running) {
 try{
 Thread.sleep(100);
 } catch(InterruptedException e) {
 System.err.println(e);
 step();
 abstract protected void step();
* Creates a single ball whose purpose is to bounce around and destroy the bricks.
* @author Kris Nelson
* @version November 10, 2004
class Ball extends MovingSprite {
 protected static final int BALL_DIAMETER = 15;
 * Constructor for objects of class Ball
 * @param xPosition the initial x screen position
 * @param yPosition the initial y screen position
 * @param xSpeedValue the speed in the x direction
 * @param ySpeedValue the speed in the y direction
 public Ball(BreakoutApplet parent,
 double xPosition, double yPosition,
 double xSpeedValue, double ySpeedValue) {
 super(parent, xPosition, yPosition, xSpeedValue, ySpeedValue);
 * Displays a ball onto the screen
 * @param g the Graphics object for this applet
 public void display(Graphics g) {
 g.setColor(Color.blue);
 g.fillOval((int)(screenX),
 (int)(screenY),
 BALL_DIAMETER, BALL_DIAMETER);
 protected void step() {
 screenX = screenX + speedX;
 if (screenX < 0) {
 screenX = -screenX;
 speedX = -speedX;
 else if ((screenX + BALL_DIAMETER)> BreakoutApplet.GAMEWIDTH) {
 screenX = 2*(BreakoutApplet.GAMEWIDTH - BALL_DIAMETER) - screenX;
 speedX = -speedX;
 screenY = screenY + speedY;
 if (screenY < 0) {
 screenY = -screenY;
 speedY = -speedY;
 else if ((screenY + BALL_DIAMETER) > BreakoutApplet.GAMEHEIGHT) {
 screenY = 2*(BreakoutApplet.GAMEHEIGHT - BALL_DIAMETER) - screenY;
 speedY = -speedY;
}

Help needed with diagnosis of WebLogic server thread dump

Sorry, my mistake - I was trying to search for "weblogic" before the dump file
loaded fully.... I am not very familiar with VisiBroker and may be totally
wrong, but my guess is it creates a thread for each connection/client. I would
look for VisiBroker properties or settings that could limit the runaway creation
of threads....
Arunabh
"Dimitri I. Rakitine" wrote:
It is, preceded by lots and lots of CORBA (visibroker) threads. Is it
possible that application code
creates new ORBs more often than it should ?
"Arunabh Hazarika" <[email protected]> wrote in message
news:[email protected]...
The attached file does not look like a WebLogic Server thread dump.....
Arunabh
Kapil Singh Pawar wrote:
I am running a web application on WebLogic server 6.0 sp2 + rp1 (HP-UX).
After
I start loading the web application with more users I constantly get thejava.lang.OutOfMemoryError.
I tried increasing the max_thread_proc kernel parameter to 2048 but thatdoes
not seem to help much. Here is the error that I get on the WebLogicServer console.
<Oct 7, 2002 5:00:27 PM GMT+02:00> <Error> <HTTP><[WebAppServletContext(1828590,i2)]
Servlet failed with Exception
java.lang.OutOfMemoryError: max threads limit being reached in VM
at java.lang.Thread.start(Native Method)
at netscape.ldap.LDAPConnThread.<init>(LDAPConnThread.java:112)
atnetscape.ldap.LDAPConnection.getNewThread(LDAPConnection.java:1117)
atnetscape.ldap.LDAPConnection.connect(LDAPConnection.java:1034)
at netscape.ldap.LDAPConnection.connect(LDAPConnection.java:915)
at netscape.ldap.LDAPConnection.connect(LDAPConnection.java:759)
atcom.i2.scm.LDAP.ScmLDAPDefaultAuthenticate.authenticate(ScmLDAPDefaultAuthen
ticate.java:129)
at scmldap.service(scmldap.java:452)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
atweblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:213)
atweblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletCo
ntext.java:1302)
atweblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java
:1676)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
>
I am posting the thread dump obtained at the OutOfMemoryError stage. Anyhelp
in diagnosing the thread dump and possible fix for this error is highlyappreciated.
For information sake, while the web application encountersOutOfMemoryError the
example web apps and WebLogic console application work fine. So it looksto be
a case of memory outage only for my custom application.
Thanks
Kapil Singh Pawar
Name: thread_dump.txt
thread_dump.txt Type: Plain Text (text/plain)
Encoding: base64--
Dimitri

Thread Dump issue with LD_ASSUME_KERNEL=2.4.1

Hi ,
When I take Thread Dump using 'jstack <PID>' in JDK 1.5 it givss me "sun.jvm.hotspot.debugger.DebuggerException" in the dump nothing more
I set LD_ASSUME_KERNEL=2.4.1 in my server to avaoid some other issue ( JVM crash some times)
Surprisingly, I can not stop my server ( my java process ) after that using our Shutdow scripts , Ctrl C or even "kill -9 <PID>",
I have to restart the machine or manually release uncleaned resources that my server occupied and restart the server
This happens Redhar 9 as well as in Linux ES.
Anybody faced similar problem?
Any help or information regarding this is highly apprecialted
Vasu
Thread Dump Output:
Caused by: sun.jvm.hotspot.debugger.DebuggerException: get_thread_regs failed for a lwp
at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.getThreadIntegerRegisterSet0(Native Meth
od)
at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.access$800(LinuxDebuggerLocal.java:34)
at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$1GetThreadIntegerRegisterSetTask.doit(Li
nuxDebuggerLocal.java:431)
at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$LinuxDebuggerLocalWorkerThread.run(Linux
DebuggerLocal.java:109)
sun.jvm.hotspot.debugger.DebuggerException: sun.jvm.hotspot.debugger.DebuggerException: get_thread_re
gs failed for a lwp
at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$LinuxDebuggerLocalWorkerThread.execute(L
inuxDebuggerLocal.java:134)
at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.getThreadIntegerRegisterSet(LinuxDebugge
rLocal.java:437)
at sun.jvm.hotspot.debugger.linux.LinuxThread.getContext(LinuxThread.java:48)
at sun.jvm.hotspot.runtime.linux_x86.LinuxX86JavaThreadPDAccess.getCurrentFrameGuess(LinuxX86
JavaThreadPDAccess.java:75)
at sun.jvm.hotspot.runtime.JavaThread.getCurrentFrameGuess(JavaThread.java:252)
at sun.jvm.hotspot.runtime.JavaThread.getLastJavaVFrameDbg(JavaThread.java:211)
at sun.jvm.hotspot.tools.StackTrace.run(StackTrace.java:42)
at sun.jvm.hotspot.tools.JStack.run(JStack.java:41)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:204)
at sun.jvm.hotspot.tools.JStack.main(JStack.java:58)
Caused by: sun.jvm.hotspot.debugger.DebuggerException: get_thread_regs failed for a lwp
at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.getThreadIntegerRegisterSet0(Native Meth
od)
at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.access$800(LinuxDebuggerLocal.java:34)
at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$1GetThreadIntegerRegisterSetTask.doit(Li
nuxDebuggerLocal.java:431)
at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$LinuxDebuggerLocalWorkerThread.run(Linux
DebuggerLocal.java:109)
sun.jvm.hotspot.debugger.DebuggerException: sun.jvm.hotspot.debugger.DebuggerException: get_thread_re
gs failed for a lwp
at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal$LinuxDebuggerLocalWorkerThread.execute(L
inuxDebuggerLocal.java:134)
at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.getThreadIntegerRegisterSet(LinuxDebugge
rLocal.java:437)

@brain0
I've downloaded the glic-2.3.6 sources from gnu, so I could build it from those. I'm however reluctant to do this because I really don't want to break my install.
I do agree with you on the NPTL statement, but pvs relies on allegro, which relies on LinuxThreads. Allegro is not being ported to new versions of glibc, so that approach is unfortunately not viable.
@iphitus
I wasn't very specific - it's allegro as in a lisp environment.
I think I'll try and install an old version of arch on wmware instead. Is there anywhere you can check out glibc version numbering on old arch install isos (ie. do I need arch-0.[1-9].iso)? And anywhere you can download the old isos (tried filewatcher, but a lot of the older sites seem broken)?
Thanks for the replies,
Mads
PS. I noticed that you recommended slackware for old kernels in another thread. I'm however in a bit different situation as I need old versions of glibc. Furthermore I would prefer sticking to arch, but was wondering whether there were any specific reasons for not doing that.

Help with Thread dump analisys

Similar Messages

Maybe you are looking for