In Quarkus, default h2 datasource configuration breaks dev services feature

This issue was imported from JIRA:

Field	Value
JIRA Link	CAM-14830
Reporter	@yanavasileva
Has restricted visibility comments	true

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Environment (Required on creation):

Quarkus extension

Description (Required on creation; please attach any relevant screenshots, stacktraces, log files, etc. to the ticket):

Quarkus offers a feature to create database with zero configuration <1> in dev mode that doesn’t work with Camunda implementation. The database cannot be created because of the h2 datasource configuration provided by default. Observed exception:

2022-08-24 10:57:06,677 ERROR <io.qua.run.Application> (Quarkus Main Thread) Failed to start application (with profile dev): java.sql.SQLException: Driver does not support the provided URL: jdbc:h2:./camunda-h2-dbs/process-engine;TRACE*LEVEL_FILE=0;DB_CLOSE_ON*EXIT=FALSE
        at io.agroal.pool.ConnectionFactory.connectionSetup(ConnectionFactory.java:220)
        at io.agroal.pool.ConnectionFactory.createConnection(ConnectionFactory.java:204)
        at io.agroal.pool.ConnectionPool$CreateConnectionTask.call(ConnectionPool.java:470)
        at io.agroal.pool.ConnectionPool$CreateConnectionTask.call(ConnectionPool.java:452)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        at io.agroal.pool.util.PriorityScheduledExecutor.beforeExecute(PriorityScheduledExecutor.java:68)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base/java.lang.Thread.run(Thread.java:832)

Steps to reproduce (Required on creation):

1. Use the Quarkus datasource example
2. Remove the h2 driver dependency and uncomment the postgresql dependency in the pom.xml file
3. Comment provided configuration in application.properties file and add the following line:

quarkus.datasource.db-kind = postgresql

1. Spin up the example in dev mode

mvn clean compile quarkus:dev

Observed Behavior (Required on creation):

The application fails with SQLException due to missing h2 driver.

Expected behavior (Required on creation):

The application starts in dev mode and creates out of the box postgresql database.

Root Cause (Required on prioritization):

Quarkus extension is provided with default h2 datasource configuration which prevents application from spin up a different database with no configuration provided by the user.

Solution Ideas (Optional):

Removed the default datasource properties so the users can get better use of Quarkus developer tool. Take care of providing datasource configuration for our test suite that relies on the default configuration at the moment.

Hints (optional):

<1>: https://quarkus.io/guides/datasource#dev-services

Links:

• is related to https://jira.camunda.com/browse/SUPPORT-14412

[yanavasileva]

Handover for testing.

Test with Quarkus datasource example. Requirement: running Docker and Portainer. Suggested scenarios:

1. Running the application in dev mode with config:

• quarkus.datasource.db-kind = pg, with only postgresql jdbc driver, expected a docker container is created
• quarkus.datasource.db-kind = h2, with only h2 jdbc driver, Edit: expected a docker container is created an in-memory database is used
• quarkus.datasource.db-kind = mysql, with only mysql jdbc driver, expected a docker container is created
• camunda h2 datasource config, with only h2 jdbc driver
• camunda postgresql config, with only postgresql jdbc driver
• camunda mysql config, with only mysql jdbc driver

1. Packaging and running the application with config:

• camunda h2 datasource config, with only h2 jdbc driver
• camunda postgresql config, with only postgresql jdbc driver
• camunda mysql config, with only mysql jdbc driver

[gbetances089]

Tested on the following config/versions:

DEV mode:

7.19.0-SNAPSHOT

• quarkus.datasource.db-kind = pg, with only postgresql jdbc driver

• Camunda h2 datasource config, with only h2 jdbc driver

7.18.1-SNAPSHOT

• quarkus.datasource.db-kind = mysql, with only mysql jdbc driver

• Camunda postgresql config, with only postgresql jdbc driver

7.17.7-SNAPSHOT

• quarkus.datasource.db-kind = h2, with only h2 jdbc driver

• Camunda mysql config, with only mysql jdbc driver

Packaging mode:

7.19.0-SNAPSHOT Camunda h2 datasource config, with only h2 jdbc driver

7.18.1-SNAPSHOT

7.17.7-SNAPSHOT

Test cases:

• https://camunda.testrail.com/index.php?/cases/view/10202
• https://camunda.testrail.com/index.php?/cases/view/10201