Setting <stubsDirectory> causes generateStubs goal to fail

[dmfrey]

Describe the bug
When setting the configuration property <stubsDirectory>, the contracts and mappings get moved to the appropriate directory and in the correct directory structure. However, when the generateStubs goal executes, it fails and indicates it's looking for the stubs in the original location. See the following configuration:

Maven Plugin Configuration:

<plugin>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-contract-maven-plugin</artifactId>
    <extensions>true</extensions>
    <configuration>
        <testFramework>JUNIT5</testFramework>
        <baseClassMappings>
            <baseClassMapping>
                <contractPackageRegex>.*orders-by-customer-id.*</contractPackageRegex>
                <baseClassFQN>com.vmware.tanzulabs.app.adapter.in.endpoint.OrdersByCustomerIdBase</baseClassFQN>
            </baseClassMapping>
        </baseClassMappings>
        <stubsDirectory>${maven.multiModuleProjectDirectory}/stubs</stubsDirectory>
    </configuration>
</plugin>

Error Output:

[ERROR] Failed to execute goal org.springframework.cloud:spring-cloud-contract-maven-plugin:3.1.3:generateStubs (default-generateStubs) on project order-app: Stubs could not be found: [/Users/dfrey/Development/git/spaceforce/daniel-frey-ctr/demo-parent/app-parent/order-app/target/stubs] .

Note the path in the exception is the original target folder and does not match up the actual project directory defined in the property.

As a workaround, setting the configuration property <outputDirectory> instead of <stubsDirectory> fixes the issue:

<outputDirectory>${maven.multiModuleProjectDirectory}/stubs</outputDirectory>