matrei opened a new issue, #16431:
URL: https://github.com/apache/grails-core/issues/16431
### Versions
- Grails 8.0.0-RC2
- Gradle 9.8.0
- Java 21
### Description
The Grails Gradle plugin registers the `configReport` task, and the other
application command tasks, in every Grails
project, including plugin projects
(`org.apache.grails.gradle.grails-plugin`) that have no application class.
These tasks run `GrailsApplicationContextCommandRunner`, which loads the
application class found by `findMainClass`
and uses it as the source of the application context the command runs in. In
a project without an application class
there is nothing to find, and the task fails with a generic Gradle provider
error that does not say what is missing:
```
Execution failed for task ':configReport' (registered by plugin class
'org.grails.gradle.plugin.commands.GrailsCliGradlePlugin').
> Cannot query the value of this provider because it has no value available.
```
```
Caused by: org.gradle.api.internal.provider.MissingValueException: Cannot
query the value of this provider because it has no value available.
at
org.gradle.api.internal.provider.AbstractMinimalProvider.get(AbstractMinimalProvider.java:100)
at
org.grails.gradle.plugin.commands.GrailsCliGradlePlugin$_configureApplicationCommands_closure12$_closure19$_closure20.doCall(GrailsCliGradlePlugin.groovy:401)
```
### Steps to reproduce
1. Take a Grails plugin project without an application class (no
`grails-app/init/.../Application.groovy`).
2. Run `./gradlew configReport`.
### Expected
Either the application command tasks are not registered for a project
without an application class, or they fail with
a message saying that they have to be run in a Grails application.
### Actual
The task fails with `Cannot query the value of this provider because it has
no value available.`
### Cause
`GrailsCliGradlePlugin.configureApplicationCommands` adds the main class to
the arguments in `doFirst` with
`appClassProvider.get()`. `GrailsGradlePlugin.getMainClassProvider` has no
value when `findMainClass` found no main
class, so `get()` throws `MissingValueException`.
### Possible fixes
- Register the application command tasks only for projects that have an
application class.
- Or check `appClassProvider.isPresent()` in `doFirst` and throw a
`GradleException` with a clear message, for example:
"The configReport task requires a Grails application with an Application
class."
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