Sockets Problem / sort of Echoing Server
Hey all, basically the problem i got is related to sockets, client program freezes up once i press the button 'send', Mainly all im trying to do right now is have a client send text to the server, then the server sends back whatever the client sent and this is then shown on the clients screen..
The code i got is
public class Server {
public static void main(String[] args){
try {
ServerSocket sSocket = new ServerSocket(3000);
Socket clientSocket = sSocket.accept();
BufferedReader fromClient = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
PrintWriter toClient = new PrintWriter(clientSocket.getOutputStream(), true);
String fClient;
while((fClient = fromClient.readLine())!= null){
toClient.println(fClient);
}catch(IOException e) {
System.err.println(e);
}And for the client class
public class Client extends JFrame implements ActionListener {
JTextArea result;
JTextField text;
Socket socket;
public Client(){
super("Client");
try{
socket = new Socket("localhost", 3000);
} catch (UnknownHostException e){
System.err.println("Unknown Host");
} catch (IOException e) {
System.err.println("Exception");
JPanel panel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
result = new JTextArea(13,10);
JButton send = new JButton("Send");
text = new JTextField(19);
send.addActionListener(this);
panel.add(text);
panel.add(send);
add(new JScrollPane(result), BorderLayout.NORTH);
add(panel, BorderLayout.SOUTH);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(300,300);
setVisible(true);
public void actionPerformed(ActionEvent e) {
String fServer = null;
BufferedReader fromServer = null;
PrintWriter toServer = null;
String aCommand = e.getActionCommand();
if(e.getSource() instanceof JButton){
if(aCommand.endsWith("Send")) {
try {
fromServer = new BufferedReader(new InputStreamReader(socket.getInputStream()));
toServer = new PrintWriter(socket.getOutputStream());
}catch(IOException e1){
System.err.println("Exception occured");
toServer.println(text.getText());
try{
fServer = fromServer.readLine();
}catch (IOException e1) {
System.err.println("Error Recievieng Result");
result.append(fServer);
}However after debugging the application, i think the main problem comes from the server side, mainly the while loop which keeps looping to see if the input recieved is null, i think the problem why the client freezes up is because nothing is being sent therefore the loops keeps going on in circles, hence not supplying the client with any text..
I would appreciate if someone could give me some help how to fix this problem
Thanks
What else could the server do? There's no problem there. The problem is that you're calling network code inside an actionPerformed method. This freezes your GUI because the method is invoked within the AWT thread, which handles all the events on the GUI. As your code is blocked in network operations, no GUI events can be processed.
Do the network operations in a separate thread.
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...} i thought there is some problem with threads
can somebody tell me how can i deal with it, as i m new newbie and how could i avoid problems in such design and complex application so that i am able to complete this application
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jibbylala
Edited by: 805185 on Nov 23, 2010 10:43 AM
Edited by: 805185 on Nov 23, 2010 11:36 AMejp:Here you are assuming that the socket is readable. Check it. You also need to check for isConnectable(), and if true, try finishConnect(), and if that succeeds deregister OP_CONNECT and register OP_READ.
where i do this or it should be done in connect method() or in readIncomingMessages() .
the current problem is connecting 2nd client.
i thought the other steps came later
i changed the connect method like this :
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} *can you just tell me why it is null as i m populating it in connect method or what should i do?
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at com.sun.jndi.ldap.LdapCtxFactory.getUsingURLs(LdapCtxFactory.java:193
+)+
at com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxInstance(LdapCtxFactory.ja
va:136)
at com.sun.jndi.ldap.LdapCtxFactory.getInitialContext(LdapCtxFactory.jav
a:66)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:6
+67)+
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288
+)+
at javax.naming.InitialContext.init(InitialContext.java:223)
at javax.naming.ldap.InitialLdapContext.<init>(InitialLdapContext.java:1
+34)+
at oracle.security.idm.providers.stdldap.TestConnectionPool.run(LDIdenti
tyStoreFactory.java:998)
+>+
line 3:12 mismatched character '<EOF>' expecting '"'
SOA Platform is running and accepting requests -
Connectivity problem with MS BizTalk Server 2010
Hi colleagues,
I have a connectivity problem between MS BizTalk Server 2010 and SAP.
There are two virtual machines (VMs on VMWare), the first one is SAP ERP6 Ehp6 (IDES), and second one is MS BizTalk Server 2010 (BT). On BT side I have deployed a package which sends ORDERS05 document to SAP and has to receive a reverse call. The bottom line is that SAP can receive a call from BT but cannot send a reverse call. Gateway monotor shows the connection:
In the trace file I can't see anything suspicious:
trc file: "dev_rd", trc level: 1, release: "721"
Tue Apr 01 20:14:28 2014
***LOG S00=> GwInitReader, gateway started ( 5060) [gwxxrd.c 1759]
systemid 562 (PC with Windows NT)
relno 7210
patchlevel 0
patchno 136
intno 20020600
make multithreaded, Unicode, 64 bit, optimized
pid 5060
gateway runs with dp version 138000(ext=120000) (@(#) DPLIB-INT-VERSION-138000-UC)
gateway (version=721.2013.09.02)
gw/reg_no_conn_info = 1
gw/local_addr : 0.0.0.0
gw/sim_mode : set to 0
***LOG S1I=> GwSetSimMode, Simulation Mode deactivated () [gwxxprf.c 4020]
* SWITCH TRC-RESOLUTION from 1 TO 1
CCMS: initialize CCMS Monitoring for ABAP instance with J2EE addin.
CCMS: SemInMgt: Semaphore Management initialized by AlAttachShm_Doublestack.
CCMS: SemInit: Semaphore 38 initialized by AlAttachShm_Doublestack.
Tue Apr 01 20:14:29 2014
Bind service sapgw00 (socket) to port 3300
GwIInitSecInfo: secinfo version = 2
GwIRegInitRegInfo: reginfo version = 2
Tue Apr 01 20:14:30 2014
GwPrintMyHostAddr: my host addresses are :
1 : [192.168.1.127] WIN2008R2 (HOSTNAME)
2 : [127.0.0.1] WIN2008R2 (LOCALHOST)
Full qualified hostname = WIN2008R2
DpSysAdmExtCreate: ABAP is active
DpSysAdmExtCreate: VMC (JAVA VM in WP) is not active
DpIPCInit2: read dp-profile-values from sys_adm_ext
DpShMCreate: sizeof(wp_adm) 42864 (2256)
DpShMCreate: sizeof(tm_adm) 5517056 (27448)
DpShMCreate: sizeof(wp_ca_adm) 64000 (64)
DpShMCreate: sizeof(appc_ca_adm) 64000 (64)
DpCommTableSize: max/headSize/ftSize/tableSize=500/16/1384064/1384080
DpShMCreate: sizeof(comm_adm) 1384080 (2744)
DpSlockTableSize: max/headSize/ftSize/fiSize/tableSize=0/0/0/0/0
DpShMCreate: sizeof(slock_adm) 0 (296)
DpFileTableSize: max/headSize/ftSize/tableSize=0/0/0/0
DpShMCreate: sizeof(file_adm) 0 (80)
DpShMCreate: sizeof(vmc_adm) 0 (2160)
DpShMCreate: sizeof(wall_adm) (41664/42896/64/192)
DpShMCreate: sizeof(gw_adm) 48
DpShMCreate: sizeof(j2ee_adm) 3952
DpShMCreate: SHM_DP_ADM_KEY (addr: 0000000011A40050, size: 7174832)
DpShMCreate: allocated sys_adm at 0000000011A40060
DpShMCreate: allocated wp_adm_list at 0000000011A430B0
DpShMCreate: allocated wp_adm at 0000000011A432A0
DpShMCreate: allocated tm_adm_list at 0000000011A4DA20
DpShMCreate: allocated tm_adm at 0000000011A4DA70
DpShMCreate: allocated appc_ca_adm at 0000000011FA0390
DpShMCreate: allocated comm_adm at 0000000011FAFDA0
DpShMCreate: system runs without slock table
DpShMCreate: system runs without file table
DpShMCreate: allocated vmc_adm_list at 0000000012101C40
DpShMCreate: system runs without vmc_adm
DpShMCreate: allocated gw_adm at 0000000012101CF0
DpShMCreate: allocated j2ee_adm at 0000000012101D30
DpShMCreate: allocated ca_info at 0000000012102CB0
DpCommAttachTable: attached comm table (header=0000000011FAFDA0/ft=0000000011FAFDB0)
MtxInit: -2 0 0
DpRqQInit: use protect_queue / slots_per_queue 0 / 2001 from sys_adm
Tue Apr 01 20:14:45 2014
GwDpInit: attached to gw_adm at 0000000012101CF0
Tue Apr 01 20:16:21 2014
Prxy Trace = 0Hi Deepak,
Thanks for the answer, but this is not the case I'm afraid. I've received an error message for BizTalk instance:
"Microsoft.ServiceModel.Channels.Common.XmlReaderParsingException: The segment name is not valid for the IDOCTYP, Release, or CIMTYP. Segment name: E2EDP01006GRP IDOCTYP: ORDERS05 Release: 620 CIMTYP: . Ensure that your message xml validates against the operation schema.
Don't really understood what does it want from me... -
I have a Mac Mini (early 2009) running OSX 10.8.1 on a Windows network that is driving me nuts.
Background
Typically, 6 or 7 computers are running (Windows 7, OSX 10.8.1 and Linux) on the network at any given point in time. Network printers and hand helds (iphones, PlayBooks, etc.) are also connected.
The problem
If one specific Windows 7 desktop is running, a pop-up error message comes up frequently. The eror message is:
There was a problem connecting to the server "[Server name or IP]". You do not have permission to access this server.
The pop-up sometimes refers to the device name and sometimes refers to the IP address of the desktop.
Oddities:
This does not occur on a MacBook Pro also running 10.8.1
The error message does not occur for other Windows computers on the network. I have laptops running Windows 7 Professional that have never shown up on the error message..
Files on the problem desktop are easily accessible through [Finder].
Things I've tried to resolve the problem:
Ran software update - multiple times
Changed the destination drive for [Time Machine] and completed a backup
Cleared the "Recent Server" list from the [Finder][Go][Connect to Server] screen
Attempted to demount the desktop in [Finder]. The option was not available
Disconnected from the desktop in [Finder]. This did not resolve the problem and the desktop was automatically showing on the [Shared] list in [Finder] after the next reboot.
Booted in SAFE mode to see if the problem re-occurred in SAFE mode. It did not.
Any suggestions would be appreciated.Thank you. It wasn't in there directly, but CISCO's "Network Magic" was there. Removing it appears to have solved the problem.
Thanks again and have a good weekend.
Bob -
Problems with AOL IMAP server connection on my BlackBerry Z10 STL100-3, and BB PlayBook 64GB WiFi
Problems with AOL IMAP server connection on my BlackBerry Z10 STL100-3, and BB PlayBook 64GB WiFi
Thursday 4:20am EST, 02-19-2015
Hi, My connection to the AOL IMAP server has suddenly failed - Says "Not Connected" on Accounts page
I haven't changed anything and this just started failing this morning.
I've saw same issue on my Blackberry PlayBook 64GB.
Is anyone else recently experiencing AOL IMAP Errors?
Solved!
Go to Solution.Yes! Same thing happened suddenly to my Z10 this morning. No AOL.
-
I can send but cannot recieve email
This is the messege I am gewtting:
There may be a problem with the mail server or network. Verify the settings for account “MobileMe” or try again.
The server returned the error: Mail was unable to log in to the IMAP server “p02-imap.mail.me.com” using “Password” authentication. Verify that your account settings are correct.
The server returned the error: Service temporarily unavailableAlso if I go to system preferences accounts and re-enter the password it fixes the glitch sometimes.
-
I just bought a 3rd generation ipod touch. It was professionally refurbished. I'm trying to set it up, and everything seems to be working fine, until we get to the wifi. I live on campus and our wifi is username and password protected. I signed in and everything seemed to work fine, and in the top left hand corner I have all the bars for wifi. However, when I go to sign in with an apple ID it says 'Could no sign in: there was a problem connecting to the server'. I've tried turning it on and off again, tried signing on to our wifi again, but it all isn't working. What can I do?
I also encountered the same problem. Try using a different email address or try signing in later.
-
Problem with the new server UCS C220 for set IP to CIMC
Hi
We’ve a problem with the new server UCS C220.
We bought two servers UCS C220 M3 for CallManager 8.6 with High Availability.
When we turn on the server during the boot and when it tells us, oppress F8 to enter at the CIMC and set the IP. But it never enters at the CIMC.
Then, we configure our DHCP server and our switch, we connect the three gigabyte ports to our switch to give him an IP to the CIMC, so and then can enter via browser, but neither works.
Note. The dedicated management NIC does not link, the other two ports do make link.
What do you suggest to put an IP to CIMC and start installing our applications?
regardsYou may have noticed that there is no DVD rom on the c220. What you need to do is:
Login into the CIMC from your browser
Luanch the KVM
Insert the VMware DVD in your machines drive
On the KVM pop up there should be a tab to mount the drive, after mounting it click on Macros and choose ctrl_alt+delete to restart.
After the VMware OS installs press F2 to enter IP.
Browse to the VMware ip to download the Vsphere client
Open the Vsphere client, enter the ip of the vmware and the username will be root and no password if you did not set one.
You can now upload OVA templates or manually create virtua machine from this enviroment.
Hope this help
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