Exact match for groupId excludes

Previous to this commit, any groupId starting with one of the
configured exclude would be excluded as well. This potentially
leads to unintentional dependency filtering: for example the
GroupIdFilter with an exclusion of "org.springframework"
also removes "org.springframework.boot" dependencies.

Add MatchingGroupIdFilter that uses an exact match instead.

See #649

spring-boot-tools/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/AbstractDependencyFilterMojo.java

@@ -28,7 +28,6 @@ import org.apache.maven.shared.artifact.filter.collection.ArtifactFilterExceptio
 import org.apache.maven.shared.artifact.filter.collection.ArtifactIdFilter;
 import org.apache.maven.shared.artifact.filter.collection.ArtifactsFilter;
 import org.apache.maven.shared.artifact.filter.collection.FilterArtifacts;
-import org.apache.maven.shared.artifact.filter.collection.GroupIdFilter;
 
 /**
  * A base mojo filtering the dependencies of the project.
@@ -48,14 +47,14 @@ public abstract class AbstractDependencyFilterMojo extends AbstractMojo {
 	private List<Exclude> excludes;
 
 	/**
-	 * Comma separated list of groupId names to exclude.
+	 * Comma separated list of groupId names to exclude (exact match).
 	 * @since 1.1
 	 */
 	@Parameter(property = "excludeGroupIds", defaultValue = "")
 	private String excludeGroupIds;
 
 	/**
-	 * Comma separated list of artifact names to exclude.
+	 * Comma separated list of artifact names to exclude (exact match).
 	 * @since 1.1
 	 */
 	@Parameter(property = "excludeArtifactIds", defaultValue = "")
@@ -96,7 +95,7 @@ public abstract class AbstractDependencyFilterMojo extends AbstractMojo {
 		}
 		filters.addFilter(new ArtifactIdFilter("",
 				cleanFilterConfig(this.excludeArtifactIds)));
-		filters.addFilter(new GroupIdFilter("", cleanFilterConfig(this.excludeGroupIds)));
+		filters.addFilter(new MatchingGroupIdFilter(cleanFilterConfig(this.excludeGroupIds)));
 		if (this.excludes != null) {
 			filters.addFilter(new ExcludeFilter(this.excludes));
 		}

spring-boot-tools/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/MatchingGroupIdFilter.java

@@ -0,0 +1,28 @@
+package org.springframework.boot.maven;
+
+import org.apache.maven.artifact.Artifact;
+import org.apache.maven.shared.artifact.filter.collection.AbstractArtifactFeatureFilter;
+
+/**
+ * An {@link org.apache.maven.shared.artifact.filter.collection.ArtifactsFilter
+ * ArtifactsFilter} that filters by matching groupId.
+ *
+ * Preferred over the {@link org.apache.maven.shared.artifact.filter.collection.GroupIdFilter} due
+ * to that classes use of {@link String#startsWith} to match on prefix.
+ *
+ * @author Mark Ingram
+ * @since 1.1
+ */
+public class MatchingGroupIdFilter extends AbstractArtifactFeatureFilter {
+
+	/**
+	 * Create a new instance with the CSV groupId values that should be excluded.
+	 */
+	public MatchingGroupIdFilter(String exclude) {
+		super("", exclude);
+	}
+
+	protected String getArtifactFeature(Artifact artifact) {
+		return artifact.getGroupId();
+	}
+}

spring-boot-tools/spring-boot-maven-plugin/src/test/java/org/springframework/boot/maven/DependencyFilterMojoTests.java

@@ -51,6 +51,19 @@ public class DependencyFilterMojoTests {
 		assertSame("Wrong filtered artifact", artifact, artifacts.iterator().next());
 	}
 
+	@Test
+	public void filterGroupIdExactMatch() throws MojoExecutionException {
+		TestableDependencyFilterMojo mojo = new TestableDependencyFilterMojo(
+				Collections.<Exclude>emptyList(), "com.foo", "");
+
+		Artifact artifact = createArtifact("com.foo.bar", "one");
+		Set<Artifact> artifacts = mojo.filterDependencies(
+				createArtifact("com.foo", "one"), createArtifact("com.foo", "two"),
+				artifact);
+		assertEquals("wrong filtering of artifacts", 1, artifacts.size());
+		assertSame("Wrong filtered artifact", artifact, artifacts.iterator().next());
+	}
+
 	private Artifact createArtifact(String groupId, String artifactId) {
 		Artifact a = mock(Artifact.class);
 		given(a.getGroupId()).willReturn(groupId);