desruisseaux opened a new pull request, #987:
URL: https://github.com/apache/maven-compiler-plugin/pull/987
In Maven 4, the recommended way to add a JAR on the annotation processor
classpath is like below:
```xml
<project>
<dependencies>
<dependency>
<groupId>org.apache.maven.plugins.compiler.it</groupId>
<artifactId>annotation-processor</artifactId>
<version>1.0-SNAPSHOT</version>
<type>processor</type>
</dependency>
</dependencies>
</project>
```
However, Maven Compiler Plugin 4.0.0-beta-3 does not automatically detects
the processor if it is declared only as above. This commit fixes that issue and
adds an integration test, together with opportunistic cleaning in other
integration tests.
In the main time, as a workaround, adding the following configuration seems
to work, where `org.foo.MyAnnotationProcessor` is the value declared in the
`META-INF/services/javax.annotation.processing.Processor` file. Note that only
the processor class is declared, not the artifact coordinates:
```xml
<project>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<annotationProcessors>
<annotationProcessor>org.foo.MyAnnotationProcessor</annotationProcessor>
</annotationProcessors>
</configuration>
</plugin>
</plugins>
</build>
</project>
```
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