Gradle reactive project errors when the maven one doesn't.

[sixcorners]

Describe the bug

If I generate a reactive project the maven version works and the gradle one doesn't.
I made projects with the dependencies described here: https://quarkus.io/guides/getting-started-reactive
code-with-quarkus (5).zip
code-with-quarkus (4).zip

Expected behavior

App starts

Actual behavior

Gradle project gives me this:
Caused by: io.quarkus.runtime.configuration.ConfigurationException: Unable to find a JDBC driver corresponding to the database kind 'postgresql' for the default datasource. Either provide a suitable JDBC driver extension, define the driver manually, or disable the JDBC datasource by adding 'quarkus.datasource.jdbc=false' to your configuration if you don't need it.

How to Reproduce?

Run
./gradlew quarkusDev
and
./mvnw quarkus:dev

Output of uname -a or ver

ver : The term 'ver' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.

Output of java -version

openjdk version "11.0.12" 2021-07-20 OpenJDK Runtime Environment Temurin-11.0.12+7 (build 11.0.12+7) OpenJDK 64-Bit Server VM Temurin-11.0.12+7 (build 11.0.12+7, mixed mode)

GraalVM version (if different from Java)

No response

Quarkus version or git rev

2.3.0.Final

Build tool (ie. output of mvnw --version or gradlew --version)

------------------------------------------------------------ Gradle 7.2 ------------------------------------------------------------ Build time: 2021-08-17 09:59:03 UTC Revision: a773786b58bb28710e3dc96c4d1a7063628952ad Kotlin: 1.5.21 Groovy: 3.0.8 Ant: Apache Ant(TM) version 1.10.9 compiled on September 27 2020 JVM: 11.0.12 (Eclipse Foundation 11.0.12+7) OS: Windows 10 10.0 amd64

Additional information

No response

[quarkus-bot]

/cc @evanchooly, @glefloch, @quarkusio/devtools

[briancullen]

I have also just come across this, glad to see I'm not the only one. I don't know if it helps but adding quarkus.datasource.jdbc=false does let the application start and work as the error message suggests. There is, however, still a INFO message from Agroal saying it is there but it can't find any datasource to attach to.

[marcelkliemannel]

I encourage the same problem. After some debugging I think the difference between both projects is that the Gradle one has the Agrogal extension added by default, but the Maven one does not.

If I add the Agrogal extension to the Maven project:

<dependency>
    <groupId>io.quarkus</groupId>
    <artifactId>quarkus-agroal</artifactId>
</dependency>

the same exception occurs.

Excluding the Agroal dependency completely from the Gradle project didn't work (resulted in a ClassNotFoundException: io.quarkus.agroal.runtime.metrics.AgroalMetricsRecorder ). However, excluding the quarkus-agroal-deployment dependency worked as a work around:

configurations.all {
  exclude(group = "io.quarkus", module = "quarkus-agroal-deployment")
}

[glefloch]

Rigth, the way gradle handle dependency exclusion is different from what maven do.
I'm testing a fix that adds some exclusion in the reactive library. I should have a PR soon.