Under Gradle, return to having guava automatically pull in the empt…

…y `listenablefuture-9999....jar` instead of making Gradle report a conflict that users need to [resolve](https://github.com/google/guava/releases/tag/v32.1.0#user-content-overlap).

See discussion in #6642: The Gradle module metadata does multiple things, most of which bring clear benefits but one of which (the `listenablefuture` part) may bring more costs than benefits at this point. (Accordingly, this CL rolls back one tiny fragment of the larger cl/544108700.)

Fixes #6642

RELNOTES=Removed the section of our Gradle metadata that caused Gradle to report conflicts with `listenablefuture`.
PiperOrigin-RevId: 551959012

guava/module.json

@@ -43,6 +43,13 @@
             "requires": "1.0.1"
           }
         },
+        {
+          "group": "com.google.guava",
+          "module": "listenablefuture",
+          "version": {
+            "requires": "9999.0-empty-to-avoid-conflict-with-guava"
+          }
+        },
         {
           "group": "com.google.code.findbugs",
           "module": "jsr305"
@@ -76,11 +83,6 @@
           "group": "com.google.collections",
           "name": "google-collections",
           "version": "${pom.version}"
-        },
-        {
-          "group": "com.google.guava",
-          "name": "listenablefuture",
-          "version": "1.0"
         }
       ]
     },
@@ -112,6 +114,13 @@
             "requires": "1.0.1"
           }
         },
+        {
+          "group": "com.google.guava",
+          "module": "listenablefuture",
+          "version": {
+            "requires": "9999.0-empty-to-avoid-conflict-with-guava"
+          }
+        },
         {
           "group": "com.google.code.findbugs",
           "module": "jsr305"
@@ -141,11 +150,6 @@
           "group": "com.google.collections",
           "name": "google-collections",
           "version": "${pom.version}"
-        },
-        {
-          "group": "com.google.guava",
-          "name": "listenablefuture",
-          "version": "1.0"
         }
       ]
     },
@@ -177,6 +181,13 @@
             "requires": "1.0.1"
           }
         },
+        {
+          "group": "com.google.guava",
+          "module": "listenablefuture",
+          "version": {
+            "requires": "9999.0-empty-to-avoid-conflict-with-guava"
+          }
+        },
         {
           "group": "com.google.code.findbugs",
           "module": "jsr305"
@@ -210,11 +221,6 @@
           "group": "com.google.collections",
           "name": "google-collections",
           "version": "${pom.version}"
-        },
-        {
-          "group": "com.google.guava",
-          "name": "listenablefuture",
-          "version": "1.0"
         }
       ]
     },
@@ -246,6 +252,13 @@
             "requires": "1.0.1"
           }
         },
+        {
+          "group": "com.google.guava",
+          "module": "listenablefuture",
+          "version": {
+            "requires": "9999.0-empty-to-avoid-conflict-with-guava"
+          }
+        },
         {
           "group": "com.google.code.findbugs",
           "module": "jsr305"
@@ -275,11 +288,6 @@
           "group": "com.google.collections",
           "name": "google-collections",
           "version": "${pom.version}"
-        },
-        {
-          "group": "com.google.guava",
-          "name": "listenablefuture",
-          "version": "1.0"
         }
       ]
     }

integration-tests/gradle/build.gradle.kts

@@ -10,15 +10,17 @@ val expectedReducedRuntimeClasspathAndroidVersion =
     "failureaccess-1.0.1.jar",
     "jsr305-3.0.2.jar",
     "checker-qual-3.33.0.jar",
-    "error_prone_annotations-2.18.0.jar"
+    "error_prone_annotations-2.18.0.jar",
+    "listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar"
   )
 val expectedReducedRuntimeClasspathJreVersion =
   setOf(
     "guava-$guavaVersionJre.jar",
     "failureaccess-1.0.1.jar",
     "jsr305-3.0.2.jar",
     "checker-qual-3.33.0.jar",
-    "error_prone_annotations-2.18.0.jar"
+    "error_prone_annotations-2.18.0.jar",
+    "listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar"
   )
 val expectedCompileClasspathAndroidVersion =
   expectedReducedRuntimeClasspathAndroidVersion + setOf("j2objc-annotations-2.8.jar")
@@ -27,7 +29,6 @@ val expectedCompileClasspathJreVersion =
 
 val extraLegacyDependencies =
   setOf(
-    "listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar",
     "google-collections-1.0.jar"
   )
 
@@ -60,7 +61,7 @@ subprojects {
       // - variant decision is made based on version suffix (android/jre) and not on the actual
       // environment
       // - runtime classpath equals the compile classpath
-      // - dependency conflict with Google Collections is not detected and '9999.0' hack is present
+      // - dependency conflict with Google Collections is not detected
       if (name.startsWith("android")) {
         expectedCompileClasspathAndroidVersion + extraLegacyDependencies
       } else {
@@ -70,7 +71,7 @@ subprojects {
       // with Gradle Module Metadata
       // - variant is chosen based on the actual environment, independent of version suffix
       // - reduced runtime classpath is used (w/o annotation libraries)
-      // - capability conflicts are detected between Google Collections and listenablefuture
+      // - capability conflicts are detected with Google Collections
       if (name.contains("Android") && !name.contains("JreConstraint")) {
         when {
           name.contains("RuntimeClasspath") -> {
@@ -127,17 +128,6 @@ subprojects {
             }
             ?.apply { select(this) }
         }
-        withCapability("com.google.guava:listenablefuture") {
-          candidates
-            .find {
-              val idField =
-                it.javaClass.getDeclaredMethod(
-                  "getId"
-                ) // reflective access to make this compile with Gradle 5
-              (idField.invoke(it) as ModuleComponentIdentifier).module == "guava"
-            }
-            ?.apply { select(this) }
-        }
       }
     }