Spring TCP Socket Integration Implementation not passing gateway.send method - sockets

Question

So I am wrapping the Spring Integration TCP client to provide APIs for my application. Previous questions regarding this can be found here and here. The problem with this is that the gateway.send() doesn't end at all and the API response never comes back.
Here is my ServerConnection.java file:
package com.abc.xyz.serverconnection;
import org.springframework.context.support.GenericXmlApplicationContext;
public class ServerConnections {
private SimpleGateway gateway;
public ServerConnections() {
final GenericXmlApplicationContext context = setupContext();
this.setGateway(context.getBean(SimpleGateway.class));
}
public static GenericXmlApplicationContext setupContext() {
final GenericXmlApplicationContext context = new GenericXmlApplicationContext();
context.load("classpath:META-INF/spring/integration/tcpClientServerDemo-context.xml");
context.registerShutdownHook();
context.refresh();
return context;
}
public SimpleGateway getGateway() {
return gateway;
}
public void setGateway(SimpleGateway gateway) {
this.gateway = gateway;
}
public boolean sendData(String input) {
this.gateway.send(input);
return true;
}
public void recieveData(String output) {
System.out.println("Data from server:" + output);
}
}
In my controller, I do something like this:
#RequestMapping(value = "/logon", method = RequestMethod.GET)
#ResponseBody
public String logon() {
// logics go here and the result is stored like below and sent
String message = "0000005401F40000C1E3E304010000000020000000000000000000000000000000000000000000004040404040404040C1E3E300C1C2C3C4C5C6C7C8E8C5E2C8E6C1D540F1F7F24BF0F1F64BF0F0F34BF0F5F200";
if (serverConnections.sendData(message)) {
return "Data sent successfully!";
} else {
return "Data not sent!";
}
}
Here is how my config looks like:
<context:property-placeholder />
<int:channel id="input" />
<int:channel id="toSA" />
<int:service-activator input-channel="toSA"
ref="echoService"
method="recieveData"/>
<bean id="echoService" class="com.abc.xyz.serverconnection.ServerConnection" />
<bean id="CustomSerializerDeserializer" class="com.abc.xyz.serverconnection.CustomSerializerDeserializer" />
<int:object-to-string-transformer id="serverBytes2String"
input-channel="serverBytes2StringChannel"
output-channel="toSA"/>
<int:gateway id="gw"
service-interface="com.abc.xyz.serverconnection.SimpleGateway"
default-request-channel="input"/>
<int-ip:tcp-connection-factory id="client"
type="client"
host="<ip>"
serializer="CustomSerializerDeserializer"
deserializer="CustomSerializerDeserializer"
port="6100"
single-use="false" />
<int-ip:tcp-outbound-gateway id="outGateway"
request-channel="input"
reply-channel="serverBytes2StringChannel"
connection-factory="client" />
EDIT: Not able to get the DEBUG log of the application since I am using the TCP client implementation as a Maven Module inside a Maven Project. Another module uses this as a dependency and that is where the REST API end-points reside at.

Answer 1

I think your
<int:service-activator input-channel="toSA"
ref="echoService"
method="recieveData"/>
Doesn't return any result to be sent to the replyChannel header, meanwhile your gateway.send() isn't a void method. That's how it waits for the reply which never comes back.