Exceptions tracing webClient calls, causes request to hang about java-spring-jaeger

[geoand]

Could you provide (a lot) more information about the problem please and possible a reproducer project?

[shurdsfield]

Steps to create issue

• I add tracing to an existing webflux project
• that project uses WebClient to call another service
• That response contains invalid headers (or anything that causes an exception)

The result is that there is an exception, but there is no response written and the request hangs without ever terminating

If i remove the tracing dependancy everything works ok and i get a response
I have attached a sample.

just go to http://localhost:8080/hello

spring-cloud-tracing-bug-2.tar.gz

[geoand]

I see that you are using a milestone version of Spring Boot. We certainly haven't tested with any such version so it is no surprise that it doesn't work.
Do you see the same behevior if you use the latest release version of Spring Boot?

[shurdsfield]

yes, i only tried that to make sure it wasnt a defect that had been fixed but yes changing version makes no difference

[geoand]

OK, thanks. I will take a look hopefully soon.

[geoand]

@shurdsfield I just tried your reproducer (albeit with Spring Boot 2.1.6.RELEASE) and the /hello endpoint worked without issues.
Can you confirm or is there something missing?

[shurdsfield]

i am using jdk : openjdk 11.0.2
and running
./gradlew bootRun

Just tried now and get the exception

[geoand]

It worked perfectly for me, here is the last part of the output:

2019-06-21 14:07:22.680  INFO 9373 --- [or-http-epoll-2] i.j.internal.reporters.LoggingReporter   : Span reported: b2a4f8c7b7b087ec:b2a4f8c7b7b087ec:0:1 - hello

The output of ./gradlew -version for me is:

------------------------------------------------------------
Gradle 5.4.1
------------------------------------------------------------

Build time:   2019-04-26 08:14:42 UTC
Revision:     261d171646b36a6a28d5a19a69676cd098a4c19d

Kotlin:       1.3.21
Groovy:       2.5.4
Ant:          Apache Ant(TM) version 1.9.13 compiled on July 10 2018
JVM:          11.0.2 (Oracle Corporation 11.0.2+9)
OS:           Linux 4.18.0-22-generic amd64

[geoand]

I also tried with java -jar .... after building with ./gradlew build and same result, the endpoint responsed properly

[shurdsfield]

Ok, so it just when using the 2.2 milestone releases i have the issue. I thought id tried with 2.1 release versions but maybe i was mistaken. something to keep an eye on with the next release

[geoand]

Awesome, thanks @shurdsfield for inverstigating.

I will go ahead and close this issue for the time being and we can reopen if there is a problem with the released of version of 2.2.x

[shurdsfield]

Just to add i am blocked since #50 means i cant upgrade to 2.1.6. if i downgrade to io.projectreactor.netty:reactor-netty:0.8.6.RELEASE to fix #50 i get the exception again

[geoand]

So it looks like reactor-netty is doing something weird... I guess we just have to wait and see what happens