Add a task that reports the artifact identifiers of the project's run…

…time classpath.

app/build.gradle.kts

@@ -10,4 +10,5 @@ repositories {
 dependencies {
     implementation(project(":util"))
     implementation("test.libs:lib1:1.0")
+    implementation("org.apache.commons:commons-collections4:4.4")
 }

app/src/main/java/App.java

@@ -1,6 +1,9 @@
+import org.apache.commons.collections4.map.LinkedMap;
+
 public class App {
     public static void main(String[] args) {
         new Util();
         new Lib1();
+        new LinkedMap<String, Long>();
     }
 }

gradle.properties

@@ -1 +1 @@
-org.gradle.unsafe.configuration-cache=true
+org.gradle.unsafe.configuration-cache=false

plugins/src/main/java/ReportArtifactMetadataTask.java

@@ -0,0 +1,31 @@
+import org.gradle.api.DefaultTask;
+import org.gradle.api.artifacts.component.ComponentArtifactIdentifier;
+import org.gradle.api.file.RegularFileProperty;
+import org.gradle.api.provider.ListProperty;
+import org.gradle.api.tasks.Input;
+import org.gradle.api.tasks.OutputFile;
+import org.gradle.api.tasks.TaskAction;
+
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+public abstract class ReportArtifactMetadataTask extends DefaultTask {
+    @Input
+    public abstract ListProperty<ComponentArtifactIdentifier> getArtifacts();
+
+    @OutputFile
+    public abstract RegularFileProperty getOutputFile();
+
+    @TaskAction
+    public void report() throws IOException {
+        File outputFile = getOutputFile().getAsFile().get();
+        try (PrintWriter writer = new PrintWriter(new FileWriter(outputFile))) {
+            for (ComponentArtifactIdentifier id : getArtifacts().get()) {
+                writer.println(id.getDisplayName());
+            }
+        }
+        System.out.println("Wrote report to " + outputFile);
+    }
+}

plugins/src/main/java/TestPlugin.java

@@ -1,9 +1,21 @@
 import org.gradle.api.Plugin;
 import org.gradle.api.Project;
+import org.gradle.api.artifacts.result.ArtifactResult;
+import org.gradle.api.artifacts.result.ResolvedArtifactResult;
+import org.gradle.api.provider.Provider;
+
+import java.util.Set;
+import java.util.stream.Collectors;
 
 public class TestPlugin implements Plugin<Project> {
     @Override
     public void apply(Project target) {
         target.getPlugins().apply("java-library");
+
+        target.getTasks().register("artifacts-report", ReportArtifactMetadataTask.class, t -> {
+            Provider<Set<ResolvedArtifactResult>> artifacts = target.getConfigurations().getByName("runtimeClasspath").getIncoming().getArtifacts().getResolvedArtifacts();
+            t.getArtifacts().set(artifacts.map(s -> s.stream().map(ArtifactResult::getId).collect(Collectors.toList())));
+            t.getOutputFile().set(target.getLayout().getBuildDirectory().file("artifacts.txt"));
+        });
     }
 }