spring-boot-devtools java.net.SocketException: Unexpected end of file from server

[evgeniycheban]

I have an issue to reload my app running inside docker container using
spring-boot-devtools:1.5.6.RELEASE
When I connect to the remote app withorg.springframework.boot.devtools.RemoteSpringApplication and do some changes then after my changes were uploaded I'm getting:
java.net.SocketException: Unexpected end of file from server
I tried to get it work on my Mac and Linux laptop but the result is always the same. Here is my log:

2017-09-16 22:20:29.693  INFO 54043 --- [   File Watcher] o.s.b.d.r.c.ClassPathChangeUploader      : Uploaded 1 class resource
Exception in thread "File Watcher" java.lang.IllegalStateException: java.net.SocketException: Unexpected end of file from server
	at org.springframework.boot.devtools.remote.client.ClassPathChangeUploader.onApplicationEvent(ClassPathChangeUploader.java:100)
	at org.springframework.boot.devtools.remote.client.ClassPathChangeUploader.onApplicationEvent(ClassPathChangeUploader.java:58)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:167)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:393)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:347)
	at org.springframework.boot.devtools.classpath.ClassPathFileChangeListener.publishEvent(ClassPathFileChangeListener.java:68)
	at org.springframework.boot.devtools.classpath.ClassPathFileChangeListener.onChange(ClassPathFileChangeListener.java:64)
	at org.springframework.boot.devtools.filewatch.FileSystemWatcher$Watcher.fireListeners(FileSystemWatcher.java:306)
	at org.springframework.boot.devtools.filewatch.FileSystemWatcher$Watcher.updateSnapshots(FileSystemWatcher.java:299)
	at org.springframework.boot.devtools.filewatch.FileSystemWatcher$Watcher.scan(FileSystemWatcher.java:259)
	at org.springframework.boot.devtools.filewatch.FileSystemWatcher$Watcher.run(FileSystemWatcher.java:239)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.net.SocketException: Unexpected end of file from server
	at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:792)
	at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:647)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1569)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474)
	at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
	at org.springframework.http.client.SimpleClientHttpResponse.getRawStatusCode(SimpleClientHttpResponse.java:52)
	at org.springframework.http.client.AbstractClientHttpResponse.getStatusCode(AbstractClientHttpResponse.java:33)
	at org.springframework.boot.devtools.remote.client.ClassPathChangeUploader.performUpload(ClassPathChangeUploader.java:116)
	at org.springframework.boot.devtools.remote.client.ClassPathChangeUploader.onApplicationEvent(ClassPathChangeUploader.java:97)
	... 12 more
2017-09-16 22:20:37.719  INFO 54043 --- [pool-1-thread-1] o.s.b.d.r.c.DelayedLiveReloadTrigger     : Remote server has changed, triggering LiveReload
2017-09-16 22:20:38.734  INFO 54043 --- [pool-1-thread-1] o.s.b.d.r.c.DelayedLiveReloadTrigger     : Remote server has changed, triggering LiveReload

Maybe it related to #1106

[eddumelendez]

@evgeniycheban I did the same using version 1.5.7.RELEASE and everything works well. Can you confirm this?

[snicoll]

@evgeniycheban I second Eddu here. For a start, it would be nice to see if you can reproduce this outside of Docker.

[evgeniycheban]

@snicoll outside of Docker everything works fine. @eddumelendez using 1.5.7.RELEASE I'm getting the same result.

[wilkinsona]

@evgeniycheban Spring Boot doesn't do anything special in a Docker environment and it expects the network to function as it would elsewhere. Can you please explain why you think this is a problem with Spring Boot rather than Docker?

[evgeniycheban]

@wilkinsona I tried to run org.springframework.boot.devtools.RemoteSpringApplication in debug mode and put breakpoint on ClassPathChangeUploader.performUpload and if I wait 3-5 seconds it will be successfully complete, it seem I need some sort of delay. For now I'm not sure it is a Docker network issue or Spring. @eddumelendez can you please provide your Dockerfile so I can compare it with mine?

[eddumelendez]

@evgeniycheban I put the Dockerfile at the root of my project

FROM java:8

COPY target/*.jar /opt/demo.jar

ENTRYPOINT ["java", "-jar", "/opt/demo.jar"]

Then, perform the following commands to build the image and run the container. Ensure you are exposing the port 8080 or whatever you are using

docker build -t bootdemo .

docker run -p 8080:8080 bootdemo

[evgeniycheban]

It seems that this error occurs only if I running it from Intellij IDEA I tried to run it from Eclipse and everything works well now.