Netty4-HTTP - synchronous - No response received from remote server error

[Alex Soto]

Hello,

I am using Camel 2.17.4, I have a route initiating a request/response  
netty4-http call:

<to 
uri="netty4-http:{{oozie.service.url}}/jobs?action=start&amp;headerFilterStrategy=#headerFilter&amp;throwExceptionOnFailure=false&amp;synchronous=true"/>
<camel:convertBodyTo type="String"/>
<log message="Oozie Response: ${body}"/>

First problem is that the synchronous=true is passed as query parameter to the 
remote server, when it should be used to configure the endpoint.

2017-11-30 09:01:07,921 | DEBUG | yClientTCPWorker | 51 - 
org.apache.camel.camel-netty4 - 2.17.4 | Channel: [id: 0x5d15a2da, 
L:/192.168.56.1:56875 - R:quickstart.cloudera/192.168.56.101:11000] writing 
body: DefaultFullHttpRequest(decodeResult: success, version: HTTP/1.1, content: 
UnpooledUnsafeNoCleanerDirectByteBuf(ridx: 0, widx: 1714, cap: 1714))
POST 
http://quickstart.cloudera:11000/oozie/v2/jobs?action=start&synchronous=true 
HTTP/1.1
Content-Length: 1714
Content-Type: application/xml
Host: quickstart.cloudera:11000
Connection: keep-alive

Second problem is that even though the server is actually responding, I am 
getting asynchronous error:

2017-11-30 09:01:08,359 | DEBUG | yClientTCPWorker | 49 - 
org.apache.camel.camel-core - 2.17.4 | Http responseCode: 201
2017-11-30 09:01:08,361 | INFO  | pool-50-thread-1 | 49 - 
org.apache.camel.camel-core - 2.17.4 | 
ID-Alexs-Laptop-local-56143-1512049637396-7-2 >>> (submitSparkQueriesWF) 
convertBodyTo[String] --> log[Oozie Response: ${body}] <<<, 
Headers:{CamelHttpResponseCode=201, CamelHttpResponseText=Created, 
Content-Type=application/json;charset=UTF-8}, BodyType:String, 
Body:{"id":"0000002-171129163622279-oozie-oozi-W"}
2017-11-30 09:01:08,362 | INFO  | pool-50-thread-1 | 49 - 
org.apache.camel.camel-core - 2.17.4 | Oozie Response: 
{"id":"0000002-171129163622279-oozie-oozi-W”}

Some time later, I get error:

2017-11-30 09:02:08,375 | ERROR | pool-50-thread-1 | 49 - 
org.apache.camel.camel-core - 2.17.4 | Failed delivery for (MessageId: 
ID-Alexs-Laptop-local-56143-1512049637396-7-4 on ExchangeId: 
ID-Alexs-Laptop-local-56143-1512049637396-7-2). Exhausted after delivery 
attempt: 1 caught: org.apache.camel.CamelExchangeException: No response 
received from remote server: quickstart.cloudera:11000. 
Exchange[ID-Alexs-Laptop-local-56143-1512049637396-7-2]
...
Stacktrace
---------------------------------------------------------------------------------------------------------------------------------------
org.apache.camel.CamelExchangeException: No response received from remote 
server: quickstart.cloudera:11000. 
Exchange[ID-Alexs-Laptop-local-56143-1512049637396-7-2]
        at 
org.apache.camel.component.netty4.handlers.ClientChannelHandler.channelInactive(ClientChannelHandler.java:130)[51:org.apache.camel.camel-netty4:2.17.4]
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:241)[32:io.netty.transport:4.0.43.Final]

Notice the error occurs in a different thread.
I don’t know why this error is occurring because there is a response,  and why 
is it not handling the exchange synchronous ?


Best regards,
Alex soto