Connect the Cassandra container to application web container failed - Error: 202 Connecting to Node - docker

Question

So, I created two docker's images and I want to connect one to which other with the docker composer. The first image is Cassandra 3.11.11 (from the official hub docker) and the other I created by myself with the tomcat version 9.0.54 and my application spring boot.
I ran the docker-compose.ylm below to connect the two container, where cassandra:latest is the cassandra's image and centos7-tomcat9-myapp is my app web's image.
version: '3'
services:
casandra:
image: cassandra:latest
myapp:
image: centos7-tomcat9-myapp
depends_on:
- casandra
environment:
- CASSANDRA_HOST=cassandra
I ran the command line to start the app web's image : docker run -it --rm --name fe3c2f120e01 -p 8888:8080 centos7-tomcat9-app .
In the console log the spring boot show me the error below. It happened, because the myapp's container could not connect to the Cassandra's container.
2021-10-15 15:12:14.240 WARN 1 --- [ s0-admin-1]
c.d.o.d.i.c.control.ControlConnection : [s0] Error connecting to
Node(endPoint=127.0.0.1:9042, hostId=null, hashCode=47889c49), trying
next node (ConnectionInitException: [s0|control|connecting...]
Protocol initialization request, step 1 (OPTIONS): failed to send
request (io.netty.channel.StacklessClosedChannelException))
What am I doing wrong?
EDIT
This is the nodetool status about the cassandra's image:
[root#GDBDEV04 cassandradb]# docker exec 552d359d177e nodetool status
Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns (effective) Host ID Rack
UN 172.18.0.3 84.76 KiB 16 100.0% 685b6e0a-13c2-4d41-ba99-f3b0fa94477c rack1
EDIT 2
I need to connect the Cassandra's DB image with the web application image. It is different to connect microservices. I tried to change the 127.0.0.0 (inside the cassandra.yaml) to 0.0.0.0 (only to test) and the error persist. I think something missing in my docker-compose.yml for sure. However, I did not know what.

Answer 1

Finally I found the error. In my case, I need to fixed the docker-compose.yml file adding the Cassandra and Tomcat's ports. And in my application.properties (spring boot config file), I changed the cluster's name.
Docker-compose.yml:
version: '3'
services:
cassandra:
image: cassandra:latest
ports:
- "9044:9042"
myapp:
image: centos7-tomcat9-myapp
ports:
-"8086:8080"
depends_on:
- cassandra
environment:
- CASSANDRA_HOST=cassandra
Application.config :
# CASSANDRA (CassandraProperties)
cassandra.cluster = Test Cluster
cassandra.contactpoints=${CASSANDRA_HOST}
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