Allow exclusions to have no explicit artifact ID in POM

core/shared/src/main/scala/coursier/maven/Pom.scala

@@ -23,14 +23,20 @@ object Pom {
   }
 
   // TODO Allow no version in some contexts
-  private def module(node: Node, groupIdIsOptional: Boolean = false): String \/ Module = {
+  private def module(
+    node: Node,
+    defaultGroupId: Option[String] = None,
+    defaultArtifactId: Option[String] = None
+  ): String \/ Module = {
     for {
       organization <- {
         val e = text(node, "groupId", "Organization")
-        if (groupIdIsOptional) e.orElse(\/-(""))
-        else e
+        defaultGroupId.fold(e)(g => e.orElse(\/-(g)))
+      }
+      name <- {
+        val n = text(node, "artifactId", "Name")
+        defaultArtifactId.fold(n)(n0 => n.orElse(\/-(n0)))
       }
-      name <- text(node, "artifactId", "Name")
     } yield Module(organization, name, Map.empty).trim
   }
 
@@ -50,7 +56,7 @@ object Pom {
         .getOrElse(Seq.empty)
       exclusions <- {
         import Scalaz._
-        xmlExclusions.toList.traverseU(module(_))
+        xmlExclusions.toList.traverseU(module(_, defaultArtifactId = Some("*")))
       }
       optional = text(node, "optional", "").toOption.toSeq.contains("true")
     } yield scopeOpt.getOrElse("") -> Dependency(
@@ -152,7 +158,7 @@ object Pom {
     import Scalaz._
 
     for {
-      projModule <- module(pom, groupIdIsOptional = true)
+      projModule <- module(pom, defaultGroupId = Some(""))
       projVersion = readVersion(pom)
 
       parentOpt = pom.children

project/Mima.scala

@@ -44,7 +44,9 @@ object Mima {
         // was private, now removed
         ProblemFilters.exclude[MissingClassProblem]("coursier.ivy.PropertiesPattern$Parser$"),
         // made private so that the shaded fastparse stuff doesn't leak
-        ProblemFilters.exclude[DirectMissingMethodProblem]("coursier.ivy.PropertiesPattern.parser")
+        ProblemFilters.exclude[DirectMissingMethodProblem]("coursier.ivy.PropertiesPattern.parser"),
+        // corresponds to a default value of a private method, not sure why this error is raised
+        ProblemFilters.exclude[IncompatibleResultTypeProblem]("coursier.maven.Pom.coursier$maven$Pom$$module$default$2")
       )
     }
   }

tests/metadata

@@ -1 +1 @@
-Subproject commit 6b2578a25220930e60b505b90e636092757d6397
+Subproject commit 0fedae521fff572d8c3f2f931ac2e1709a026258

tests/shared/src/test/resources/resolutions/org.datavec/datavec-api/0.9.1

@@ -0,0 +1,27 @@
+com.clearspring.analytics:stream:2.7.0:compile
+com.github.stephenc.findbugs:findbugs-annotations:1.3.9-1:compile
+com.google.code.findbugs:annotations:2.0.1:compile
+com.google.guava:guava:18.0:compile
+commons-io:commons-io:2.4:compile
+it.unimi.dsi:fastutil:6.5.7:compile
+joda-time:joda-time:2.9.2:compile
+junit:junit:4.8.2:compile
+net.ericaro:neoitertools:1.0.0:compile
+net.sf.opencsv:opencsv:2.3:compile
+org.apache.commons:commons-compress:1.8.1:compile
+org.apache.commons:commons-lang3:3.3.1:compile
+org.apache.commons:commons-math3:3.4.1:compile
+org.bytedeco:javacpp:1.3.3:compile
+org.codehaus.woodstox:stax2-api:3.1.4:compile
+org.datavec:datavec-api:0.9.1:compile
+org.freemarker:freemarker:2.3.23:compile
+org.javassist:javassist:3.18.2-GA:compile
+org.nd4j:jackson:0.9.1:compile
+org.nd4j:nd4j-api:0.9.1:compile
+org.nd4j:nd4j-buffer:0.9.1:compile
+org.nd4j:nd4j-common:0.9.1:compile
+org.nd4j:nd4j-context:0.9.1:compile
+org.projectlombok:lombok:1.16.16:compile
+org.reflections:reflections:0.9.10:compile
+org.slf4j:slf4j-api:1.7.10:compile
+org.yaml:snakeyaml:1.12:compile

tests/shared/src/test/scala/coursier/test/CentralTests.scala

@@ -850,6 +850,13 @@ abstract class CentralTests extends TestSuite {
         assert(expectedUrls.forall(urls))
       }
     }
+
+    'noArtifactIdExclusion - {
+      val mod = Module("org.datavec", "datavec-api")
+      val ver = "0.9.1"
+
+      * - resolutionCheck(mod, ver)
+    }
   }
 
 }