tbroyer commented on a change in pull request #40:
URL: 
https://github.com/apache/maven-compiler-plugin/pull/40#discussion_r630410255



##########
File path: 
src/main/java/org/apache/maven/plugin/compiler/AbstractCompilerMojo.java
##########
@@ -1660,26 +1660,27 @@ private boolean hasNewFile( File classPathEntry, Date 
buildStartTime )
                 requiredArtifacts.add( artifact );
             }
 
-            ArtifactResolutionRequest request = new ArtifactResolutionRequest()
-                            .setArtifact( requiredArtifacts.iterator().next() )
-                            .setResolveRoot( true )
-                            .setResolveTransitively( true )
-                            .setArtifactDependencies( requiredArtifacts )
-                            .setLocalRepository( session.getLocalRepository() )
-                            .setRemoteRepositories( 
project.getRemoteArtifactRepositories() );
+            Set<String> elements = new HashSet<>(  );
 
-            ArtifactResolutionResult resolutionResult = 
repositorySystem.resolve( request );
+            for ( Artifact artifact : requiredArtifacts )
+            {
+                ArtifactResolutionRequest request = new 
ArtifactResolutionRequest()
+                                .setArtifact( artifact )
+                                .setResolveRoot( true )
+                                .setResolveTransitively( true )
+                                .setLocalRepository( 
session.getLocalRepository() )
+                                .setRemoteRepositories( 
project.getRemoteArtifactRepositories() );
 
-            resolutionErrorHandler.throwErrors( request, resolutionResult );
+                ArtifactResolutionResult resolutionResult = 
repositorySystem.resolve( request );

Review comment:
       There should probably be a single call to `resolve` with some synthetic 
artifact that depends on all the `requiredArtifacts`, such that dependency 
mediation can take place (e.g. two processors or compiler plugins have a 
dependency on Guava on different versions; you'll want a single Guava JAR in 
the processor path)




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