Genericservlet on a socket

Hi,
Is it possible to deploy GenericServlets that would listen on TCP/IP socket messages (without the Http GET line)? I need to write a servlet which listens on Sockets. As am totally new to Sockets am little confused. Can anyone help me on this.
As in the API doc for GenericServlet:
Defines a generic, protocol-independent servlet.

Hi,
Thanks for the reply.My requirement here is Client sends ASCII messages over TCP/IP. I need to capture this message.
Here i have two approaches. One is using sockets. But using Sockets means we need to take complete care of Threads. And second method is using Generic Servlet, as Generic servlet can listen on TCP/IP since it is protocal Independent. But am not finding any example as how to start with this approach. Can u help on this. And other method is Use socket to get the TCP/IP messages and forward it to Generic Servlet. But not sure about the advantages and disadvantages of this approach.
The one i posted was quite misleading i think.. Sorry.. This is the deatailed explanation. Can you please help me with this.

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GenericServlet on raw socket

Hi,
          is ist possible to deploy GenericServlets that would listen on raw socket messages (without the Http GET line)?
          As in the API doc for GenericServlet:
          Defines a generic, protocol-independent servlet.
          Thanks,
          Juergen

That's a pity. No chance of it getting implemented in WLS? I found this paper discussing the problem:
          An Approach Paper for Listener Architecture using Web Server
          http://dev2dev.bea.com/pub/a/2004/06/Approachppr.html

GenericServlet on JDeveloper

Hi all,
how i can execute a GenericServlet on Jdeveloper, I test a servlet inherited from HttpServlet and I don't have problems but when a try to connect to GenericServlet my clients objects can't connect to it.
JDeveloper display me a java.io.FileNotFoundException error.
I use the same parameters (URL string, etc) for all test, the only thing that I change was that one is HttpServlet and other is GenericServlet.
thansk for advise

Hi,
Thanks for the reply.My requirement here is Client sends ASCII messages over TCP/IP. I need to capture this message.
Here i have two approaches. One is using sockets. But using Sockets means we need to take complete care of Threads. And second method is using Generic Servlet, as Generic servlet can listen on TCP/IP since it is protocal Independent. But am not finding any example as how to start with this approach. Can u help on this. And other method is Use socket to get the TCP/IP messages and forward it to Generic Servlet. But not sure about the advantages and disadvantages of this approach.
The one i posted was quite misleading i think.. Sorry.. This is the deatailed explanation. Can you please help me with this.

Reading from a non-HTTP socket in WL; same idea as WL.system.listenPort

Hi Fellow EJBers,
I have a system which must listen on a TCP port that is not the normal
WebLogic port nor the standard HTTP port for client connection
requests. Unfortunately, the protocol is low-level TCP/IP sockets and
as it's coming from a legacy system I cannot change. What I'd like to
do is create a startup class in the EJB server that listens to the
correct port and then hands off the socket ID to a bean for further
processing. Then when the response is ready I can use a simple socket
write() method.
I am hoping that this will allow me to use WebLogic's built-in threading
support in this class. I was hoping to find some way to imitate the
WebLogic properties file entry
weblogic.system.listenPort=7001
but I didn't see any references to it in the documentation. Can I use a
servlet or startup class to do this? I don't want to use events if I
can help it to maintain compatibility. Alternatively, I'm thinking
about using a separate Java process running in a different JVM which
would manage the threading issues. This is less desirable because it
complicates sending responses back and I don't know if I can pass the
socket reference into EJB.
Note that right now I'm only worrying about the listening portion, I
must also send requests out to different machines but here I control the
initiation.
Thanks for any and all help,
Terry ([email protected])

Rob,
Could you please explain why you should not create worker threads in the server.
I created a GenericServlet and installed it in the ServerClasses so it does not
ever get more than one instance - it listens on a server socket (in a thread) and
accepts connections and allows replies to the
connected socket. I use it for debugging where you connect to the port with Telnet and
each developer that wants to output a debug string from a JSP back to their Telnet can
do so. It works fine.
I don't want to screw the server up so please enlighten me.
Joe
Rob Woollen wrote:
If you have a legacy system that is sending data over TCP/IP sockets, you have
to have a socket for it somewhere. It's certainly not an ideal situation since
WebLogic already provides these basic services for you, just not for an arbitrary
protocol.
You definitely should not create worker threads in the server. Use WebLogic
events or JMS instead.
-- Rob
Rob Woollen
Software Engineer
BEA WebLogic
[email protected]
Russell Castagnaro wrote:
Rob,
Is it OK to start your own threads that listen on a particular port? I've been
informed over and over again that this is a recipe for disaster. If it is
acceptable to start up a port listener thread at some times, when is it
acceptable and when isn't it? (I know not to do it with Servlets or EJB's)
Thanks in advanced..
Russell
Rob Woollen wrote:
Hi.
Terence Davis wrote:
Hi Fellow EJBers,
I have a system which must listen on a TCP port that is not the normal
WebLogic port nor the standard HTTP port for client connection
requests. Unfortunately, the protocol is low-level TCP/IP sockets and
as it's coming from a legacy system I cannot change. What I'd like to
do is create a startup class in the EJB server that listens to the
correct port and then hands off the socket ID to a bean for further
processing. Then when the response is ready I can use a simple socket
write() method.
Okay, that seems reasonable. Note, that EJB 1.1 (the next version of
the spec) prohibits bean writers from directly reading or writing sockets.
I am hoping that this will allow me to use WebLogic's built-in threading
support in this class. I was hoping to find some way to imitate the
WebLogic properties file entry
weblogic.system.listenPort=7001
but I didn't see any references to it in the documentation.I'm not sure that I follow. You could use your own properties file if
you want to configure a listen port for your socket.
Can I use a
servlet or startup class to do this? I don't want to use events if I
can help it to maintain compatibility.JMS (available in 4.5.x) is a J2EE standard tha has a superset of the
events functionality.
Alternatively, I'm thinking
about using a separate Java process running in a different JVM which
would manage the threading issues. This is less desirable because it
complicates sending responses back and I don't know if I can pass the
socket reference into EJB.
Note that right now I'm only worrying about the listening portion, I
must also send requests out to different machines but here I control the
initiation.
Thanks for any and all help,
Terry ([email protected])
Russell Castagnaro
Chief Mentor
SyncTank Solutions
http://www.synctank.com
Earth is the cradle of mankind; one does not remain in the cradle forever
-Tsiolkovsky

Problem with socket and Threads

Hi,
I have coded a package that sends an sms via a gateway.
Here is what is happening:
* I create a singleton of my SMSModule.
* I create an sms object.
* I put the object in a Queue.
* I start a new Thread in my sms module that reads sms from queue.
* I connect to sms gateway.
* I send the sms.
* I disconnect from socket! This is where things go wrong and I get the following error (see below).
I have a zip file with the code so if you have time to take a look at it I would appreciate it.
Anyway all hints are appreciated!
//Mikael
GOT: !LogoffConf:
mSIP Kommando var: !LogoffConf
CoolFlix log: MSIPProtocolHandler;setLoggedin(false)
We got LogOffConf
Waiting ......for thread to die
java.net.SocketException: Socket operation on nonsocket: JVM_recv in
socket input stream read
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:116)
at
sun.nio.cs.StreamDecoder$CharsetSD.readBytes(StreamDecoder.java:405)

Off the top of my head, probably the garbage collector cleared your SMSModule coz all classes loaded through other classloaders will be unloaded when that classloader is unloaded.
mail in the code if you want me to look at it with greater detail.

Can i use the same socket to connect to more than one servers

hi,
I'm new to java. I want to know whether a socket created using Socket() constructor can be used to connect to multiple servers, not necessarily at a particular point of time. ie, i want to connect to various servers using a single socket and register some info abt them, possible using a loop, one by one. I use connect() method to connect to particular server.
In other words is Socket class is mutable.
Edited by: itsraja on Feb 25, 2008 5:50 AM

In short, I don't think so.
Setting the server name for a socket is in the constructor.
Socket s = new Socket("localhost", 501);I don't believe that there are any functions, such as:
s.setHost("localhost");
s.setPort(501);However, JavaDocs suggests that when you use the no-args constructor, your class becomes an automatic SocketImpl class, but you can't reach any of its variables unless you derive from the class, itself. But that's probably a bigger headache than it's worth.
Now TECHNICALY, if you didn't want to create a new variable, you could use:
Socket s = new Socket("localhost", 501);
s.close();
s = new Socket("remotehost", 502);
s.close();However, this is still creating a new instance and thus a new object in memory.
I hope this answers your question.
Let us know exactly what you're trying to do for a more exact answer.
~Derek

My iPod Touch will no longer charge from a wall socket, only my computer. HELP!

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Signed, a very frustrated iPod user in Ohio!
<Edited By Host>

All I can suggest is the standared fixes. It seems very strange
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Barton 3200 core proc.
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Quote from: freakytiki4u on 07-November-06, 23:42:33
Ok I tried to use relaxed FSB by -10 and relaxed mem timings but still unstable due to the motherboard trying to use dual channel memory. If you can modify the bios to where it will not have the capability of dual channel memory I truly believe it will work. Will u try this for me? I would greatly appreciate it as I am really not ready to spend all the money on new equipemtn when this suits my needs for now.
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MSI K7N2 Delta ILSR Experimental MOD E1(Disable Dual CH ability)
Procedure is automated in best possible safest way to BIOS update.
Prepare a blank diskette in a good condition(newest one etc.)
]execute file under XP will make bootdisk with automated BIOS update procedure. when diskette is ready, reboot PC and boot from FDD(floppy), wait a bit, then you will be asked for final confirmation about BIOS update process, press a key to proceed, after BIOS update is complete, ensure that you got successfully output message from flash program. then power down your PC, remove power cord from the PSU, hit power button several time to drain caps electrify, touch with hands some metal for ES discharge, and Clear CMOS.
pull back power cord, power up your PC, when you see CMOS checksum error,(expected msg) hit F1 to continue to re-build DMI pool data, then reboot and enter in BIOS, LOAD BIOS DEFAULT, and SAFE AND EXIT.
NOTE: Ensure your PC is stable before proceed with BIOS update.
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HI
I am in the process of developing a xml socket server application and have hit on a problem. I have managed to create a server that listens for connections and once a request is recieved creates a new client on a seperate thread with the reference being stored in a vector in the server.
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my apologies my question was poorly stated..
When i meant unique i mean that they will have already been prdefined i.e for example the following users
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oops...forgot link to bug description: http://flashmog.net/community/viewtopic.php?f=5&t=549

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Genericservlet on a socket

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