wso2 API Endpoint creation failed: 404 ressource not found - postgresql

Question

I am trying to create a REST API with wso2 API_Manager to gather data from a Postgres database (learning purpose). I struggle doing so and I would like to know whether:
I did not understand wso2 components' roles properly (new techno and subject for me)
or there is an error in the way I configured the manager.
System setup
I used this official docker image, added postgres jdbc jar in /repository/components/lib/ and added the following in /repository/conf/datasources/master-datasources.xml:
<datasource>
<name>s0m3dAtabas3</name>
<description>The db used for testing purposes</description>
<definition type="RDBMS">
<configuration>
<url>jdbc:postgresql://sandor_postgres:5432/s0m3dAtabas3</url>
<driverClassName>org.postgresql.Driver</driverClassName>
<username>s0m3us3rfr0mdAtAMaj0r</username>
<password>N0t5uchAs1mple1</password>
<maxActive>80</maxActive>
<minIdle>5</minIdle>
<maxWait>60000</maxWait>
<defaultAutoCommit>false</defaultAutoCommit>
<testOnBorrow>true</testOnBorrow>
<validationInterval>30000</validationInterval>
</configuration>
</definition>
</datasource>
I made sure than the postgres' container named sandor_postgres is accessible from wso2's with these credentials. In this database, I have a table called something. The image comes with the following UIs:
admin
publisher
store
Graphical API creation
I first followed the WorldBank tutorial which seemed crystal clear (though I am not quite sure where the data came from). I then tried to adapt it.
Step 1: Design
I used the database name as context (s0m3dAtabas3) v.1.0.0. Since the table is called something, the url pattern I end up with is /s0m3dAtabas3/1.0.0/something
Step 2: Implement
This is where things start to be confusing. No matter the resource path I use in the Endpoint (end point type REST), I get a 404 and the logs are not very helpful
http://192.168.8.111:8280 -> 404
http://192.168.8.111:8280/something -> 404
http://192.168.8.111:9443/tried_several -> Invalid - Error connecting to backend
http://192.168.8.111:8243/tried_several -> Invalid - Error connecting to backend
INFO - InboundDBSyncRequestEvent Running DB sync task.
INFO - LogMediator STATUS = Message dispatched to the main sequence. Invalid URL., RESOURCE = /s0m3dAtabas3/1.0.0
INFO - CarbonAuthenticationUtil 'admin#carbon.super [-1234]' logged in at [2019-10-29 11:42:31,030+0000]
INFO - CarbonAuthenticationUtil 'admin#carbon.super [-1234]' logged in at [2019-10-29 11:42:31,197+0000]
INFO - LogMediator STATUS = Message dispatched to the main sequence. Invalid URL., RESOURCE = /s0m3dAtabas3/bullshit
INFO - CarbonAuthenticationUtil 'admin#carbon.super [-1234]' logged in at [2019-10-29 11:48:30,649+0000]
INFO - CarbonAuthenticationUtil 'admin#carbon.super [-1234]' logged in at [2019-10-29 11:48:30,790+0000]
INFO - LogMediator STATUS = Message dispatched to the main sequence. Invalid URL., RESOURCE = /
INFO - InboundDBSyncRequestEvent Running DB sync task.
INFO - LogMediator STATUS = Message dispatched to the main sequence. Invalid URL., RESOURCE = /
Did I miss some important configuration step or wso2 API Manager is not the standalone component I thought it was and requires another component to achieve what I am looking for?

Answer 1

It seems there is a misunderstanding in the concept-wise.
Here is the basic idea of a typical API Management solution.
You have a web service (REST, SOAP, etc...) which you need to expose as a managed API. Now, you can front your service with API Manager and expose it as a managed API with security, rate limiting, managed life cycle etc.
In your case, it seems you don't have such a service, but only have a database table. So, before using API Manager to front your service, you first need to expose your table as a service. For that purpose, I'd suggest you use the data service component of WSO2 EI 7.0.0. See [1] for how to do that. Once you have your service ready, you can use API Manager to expose it as a managed API.
[1] https://ei.docs.wso2.com/en/latest/micro-integrator/use-cases/tutorials/sending-a-simple-message-to-a-datasource/