Internal Server Error 500, when accessing Spring boot endpoint in Docker - mongodb

Question

I am trying to learn app deployment with Docker. My configurations are as below:
application.properties
####### Mongo Properties ###########
spring.data.mongodb.uri=mongodb://mongo/locationsdb
Dockerfile
FROM openjdk:14-alpine
ARG JAR_FILE=./target/*jar
COPY ${JAR_FILE} jarapp.jar
EXPOSE 8080
ENTRYPOINT ["java", "-Dspring.profiles.active=docker", "-jar", "jarapp.jar"]
docker-compose.yml
version: "3"
services:
mongodb-container:
image: mongo:latest
container_name: "mongodb-container"
restart: always
ports:
- 27017:27017
server-container:
image: server_side
container_name: "server-container"
restart: always
ports:
- 8080:8080
links:
- mongodb-container
depends_on:
- mongodb-container
After the above then I did the following:
docker-compose config
docker-compose up --build
But I was gething the below error:
server-container | 2021-09-02 09:44:41.253 INFO 1 --- [localhost:27017] org.mongodb.driver.cluster : ***Exception in monitor thread while connecting to server localhost:27017***
server-container |
server-container | com.mongodb.MongoSocketOpenException: **Exception opening socket**
server-container | at com.mongodb.internal.connection.SocketStream.open(SocketStream.java:70) ~[mongodb-driver-core-4.2.3.jar!/:na]
server-container | at com.mongodb.internal.connection.InternalStreamConnection.open(InternalStreamConnection.java:143) ~[mongodb-driver-core-4.2.3.jar!/:na]
server-container | at com.mongodb.internal.connection.DefaultServerMonitor$ServerMonitorRunnable.lookupServerDescription(DefaultServerMonitor.java:188) ~[mongodb-driver-core-4.2.3.jar!/:na]
server-container | at com.mongodb.internal.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:144) ~[mongodb-driver-core-4.2.3.jar!/:na]
server-container | at java.base/java.lang.Thread.run(Thread.java:832) ~[na:na]
server-container | Caused by: java.net.ConnectException: Connection refused
server-container | at java.base/sun.nio.ch.Net.pollConnect(Native Method) ~[na:na]
server-container | at java.base/sun.nio.ch.Net.pollConnectNow(Net.java:589) ~[na:na]
server-container | at java.base/sun.nio.ch.NioSocketImpl.timedFinishConnect(NioSocketImpl.java:542) ~[na:na]
server-container | at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:597) ~[na:na]
server-container | at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:333) ~[na:na]
server-container | at java.base/java.net.Socket.connect(Socket.java:648) ~[na:na]
server-container | at com.mongodb.internal.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:107) ~[mongodb-driver-core-4.2.3.jar!/:na]
server-container | at com.mongodb.internal.connection.SocketStream.initializeSocket(SocketStream.java:79) ~[mongodb-driver-core-4.2.3.jar!/:na]
server-container | at com.mongodb.internal.connection.SocketStream.open(SocketStream.java:65) ~[mongodb-driver-core-4.2.3.jar!/:na]
server-container | ... 4 common frames omitted
server-container |
server-container | 2021-09-02 09:44:43.395 INFO 1 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
server-container | 2021-09-02 09:44:43.429 INFO 1 --- [ main] c.f.virtuallab.VirtuallabApplication : Started VirtuallabApplication in 26.943 seconds (JVM running for 28.445)
mongodb-container | {"t":{"$date":"2021-09-02T09:45:13.967+00:00"},"s":"I", "c":"STORAGE", "id":22430, "ctx":"Checkpointer","msg":"WiredTiger message","attr":{"message":"[1630575913:967258][1:0x7fef40740700], WT_SESSION.checkpoint: [WT_VERB_CHECKPOINT_PROGRESS] saving checkpoint snapshot min: 34, snapshot max: 34 snapshot count: 0, oldest timestamp: (0, 0) , meta checkpoint timestamp: (0, 0) base write gen: 1"}}
As it shows in the log, There was a Exception opening socket problem and then it says this: server-container | 2021-09-02 09:44:43.429 INFO 1 --- [ main] c.f.virtuallab.VirtuallabApplication : Started VirtuallabApplication in 26.943 seconds (JVM running for 28.445) afterwards.
When i tried my end point: localhost:8080/api/v1/locations I was only getting Internal Server Error (500).
Could someone guide me on how to properly connect the mongodb and get the application started?

Answer 1

Try changing
####### Mongo Properties ###########
spring.data.mongodb.uri=mongodb://mongodb-container/locationsdb
You are using mongo as your mongodb host but you have declared mongodb container as mongodb-container in your docker-compose file. So your mongodb instance should be accessed by mongodb-container and not by mongo.

Answer 2

I think no need to expose mongodb port with host machine if in the frontend it's already programmed. But have to mention same username & password alogwith hostname I mean container name to the mongodb container.