Issues related to socket channel for stream-oriented connecting sockets in Java
A socket channel represents a "selectable channel" for stream-oriented connecting sockets in Java. It is part of the Java NIO library.
Questions tagged [socketchannel]
249 questions
0
votes
2 answers
Java NIO: Read data from Channel which does not contain any data. How do I handle this situation?
Java code below:
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
public class Test {
public static void main(String[] args) throws IOException {
…
user471011
- 7,104
- 17
- 69
- 97
0
votes
2 answers
Java NIO. Why flip() method breaks my program?
Java code below:
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
public class Test {
public static void main(String args[]) throws IOException {
…
user471011
- 7,104
- 17
- 69
- 97
0
votes
1 answer
Java NIO ByteBuffer : read the message size on head before read the complete message
I'm making a java NIO server which receive messages, each message have its size on the head of the message, that why I'm reading first into a buffer which have default size(44), then get the complete size from this buffer, and then create a new…
Fozix
- 133
- 3
- 12
0
votes
2 answers
Java SocketChannel read the messages of unknown length
SocketChannel channel = (SocketChannel) key.channel();
ByteBuffer buffer = ByteBuffer.allocate(1024);
int numRead = -1;
try {
numRead = channel.read(buffer);
System.out.println("numRead: " + numRead);
}
catch…
user1221483
- 431
- 2
- 7
- 20
0
votes
1 answer
ConcurrentHashMap not inserting the non null key value pair upon calling the put method
I am using a ConcurrentHashMap to cache task that I am processing on a SocketChannel. The StreamTask is a Runnable that is use to reschedules itself if the round trip threshold is elapse during client server communication, therefore it will remove…
Robert Brooks
- 701
- 2
- 8
- 12
0
votes
1 answer
how to tell whether a connection is established in java?
I tried to build a socket channel between two emulators in android. I wrote the following code:
public SocketChannel connect2node(String ip, int port) {
SocketChannel client = null;
try {
client =…
stackunderflow
- 877
- 4
- 13
- 28
-1
votes
2 answers
Selector.select() is not blocking after a SelectionKey.isReadable is read
I have a Socket that connects to a ServerSocketChannel which passes off to another Selector. The client socket sends a one time message of 8 bytes, I successfully read it, but then selector which I call selectorIO should block on the select()…
Matthew
- 3,886
- 7
- 47
- 84
-1
votes
1 answer
SocketChannel.write() throwing OutOfMemoryError when attempting to write large buffer
My code throws an OutOfMemoryError when running the following line:
int numBytes = socketChannel.write(_send_buffer);
where socketChannel is an instance of java.nio.channels.SocketChannel
and _send_buffer is an instance of java.nio.ByteBuffer
The…
topher217
- 1,188
- 12
- 35
-1
votes
1 answer
How to read more than 1024 bytes to x bytes in Netty
I am new here. I have this issue with netty. Data is getting truncated when it exceeds 1024 bytes.
this issue arose when i ported from norm io Socket to Netty, using io i can read any data of x bytes like this TheClient is a separate thread that…
milo7
- 1
- 1
-1
votes
1 answer
ServerSocketChannel.socket() is still bound after close()
I Used java.nio for server programming and it works fine.
When I try to close socket:
serverChannel.socket().close();
serverChannel.close();
boolean b1 = serverChannel.socket().isBound();
boolean b2 =
…
GauravRatnawat
- 717
- 1
- 11
- 25
-1
votes
2 answers
Paramiko channel send request to start trace remotely
I am new to this concept so please help!
I am using Paramiko Channel to execute a command and start a trace. I want the trace to continue running until I send a stop request to trace. If I use channel.send(cmd) it starts and stops the trace whereas…
Prabhleen Kaur
- 13
- 3
-1
votes
1 answer
How do you transfer a socket connection from one socketchannel to another?
I have a ServerSocketChannel and once this channel accepts a connection I want to "transfer" or "pass" it to a SocketChannel. I have tried, once I have accepted the connection, to simply do a…
DirtbagJohnny
- 7
- 2
-1
votes
1 answer
Java NIO Socketchannel only sends data after shutting down output. Why is this?
I am trying to write a program which accepts java nio SocketChannel Connections but also keeps them open. So lets say the Client sends a message, then should the Server immediately send the same message back (Simple Echo Server), but the answering…
user10170559
-1
votes
1 answer
Java NIO Socket Channel mismatch in size of sent and received bytes
I have the server and the client.
Server sends data using this:
private int writeMessage(AgentHandler agentHandler, Msg message) {
SocketChannel sc = agentHandler.getSocketChannel();
byte[] encodedMessage =…
-1
votes
2 answers
SocketChannelImpl.write(ByteBuffer[] srcs, int offset, int length) appends ByteBuffer of size 0
I have a client-server application communicating over Java NIO sockets which makes use of the SocketChannelImpl class underneath. When from the senders side, I send a ByteBuffer array of length n elements, the client always receives ByteBuffer array…
jaywalker
- 1,116
- 4
- 26
- 44