Docker container running Spring Boot application not answering requests

Question

I am running a Docker container on my system with a Spring Boot application, but I am getting "empty reply from server" messages when trying to curl to localhost:8080 , 0.0.0.0:8080 or myipaddress:8080 . I am new to Docker and I don't know why the server isn't responding. docker ps shows the following:

CONTAINER ID   IMAGE                  COMMAND                CREATED         STATUS         PORTS                    NAMES
5ff52ba449fd   springio/test          "java -jar /app.jar"   2 hours ago     Up 2 hours     0.0.0.0:8080->8080/tcp   eloquent_hertz

Docker command to run:

docker run -p 8080:8080 springio/test

My Dockerfile :

FROM openjdk:8-jdk-alpine
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} app.jar
ENTRYPOINT ["java","-jar","/app.jar"]

Answer 1

Your Dockerfile seems to be correct. I quickly tested it out with a simple springboot application, and it worked fine. I would assume this problem comes from the application itself. Have you defined a mapping inside your application for the endpoint your curling to? so @GetMapping("/") or something similar?

Answer 2

What does your browser say when you open localhost:8080?