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jpa-cockroachdb's Introduction

Example project: kafka-driven accounting

Prerequisites

Database

To run the application you need a postgres or cockroachDB database running. There must be a database lotto available. The user/server information is located in the src/main/docker/postbootcommands.asadmin file.

Kafka

A kafka cluster is required (local dev cluster is sufficient).

Getting started

Path to jar:
target/payara-micro.jar

Specify the correct location of the cockroachDB or postgres db in the file:
postbootcommands.asadmin

VM options (define the kafka server... in this case just the local dev cluster):
-Dkafka.servers=localhost:9092

Program arguments:
--deploy kafka-rar.rar --addJars postgresql.jar --deploy ROOT.war --port 8080 --postbootcommandfile ../src/main/docker/postbootcommands.asadmin

Set the working directory to the maven target folder

Do a maven install before running it.

Create a player

Execute the request defined in the register.http file to register the user 'John Doe'

Send some accounting events

The kafka message body has to be in JSON format with the following content:
{"id": "YOUR_TRANSACTION_ID", "playerId": "jdo", "payable": 0, "nonPayable": 250, "description": "just a test"}

Responses

The responses are delivered in 2 different topics:

  • accountUpdates for successful transactions
  • transactionFailures for failures during processing

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