6 files changed, 60 insertions, 0 deletions
diff --git a/java/aar.go b/java/aar.go
index f61fc8374..a26b5e18c 100644
--- a/java/aar.go
+++ b/java/aar.go
@@ -808,6 +808,9 @@ func (a *AndroidLibrary) DepsMutator(ctx android.BottomUpMutatorContext) {
 func (a *AndroidLibrary) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	a.aapt.isLibrary = true
 	a.classLoaderContexts = a.usesLibrary.classLoaderContextForUsesLibDeps(ctx)
+	if a.usesLibrary.shouldDisableDexpreopt {
+		a.dexpreopter.disableDexpreopt()
+	}
 	a.aapt.buildActions(ctx,
 		aaptBuildActionOptions{
 			sdkContext:                     android.SdkContext(a),
diff --git a/java/app.go b/java/app.go
index 0c56d81fc..32c69a173 100755
--- a/java/app.go
+++ b/java/app.go
@@ -777,6 +777,9 @@ func (a *AndroidApp) generateAndroidBuildActions(ctx android.ModuleContext) {
 	a.onDeviceDir = android.InstallPathToOnDevicePath(ctx, a.installDir)
 
 	a.classLoaderContexts = a.usesLibrary.classLoaderContextForUsesLibDeps(ctx)
+	if a.usesLibrary.shouldDisableDexpreopt {
+		a.dexpreopter.disableDexpreopt()
+	}
 
 	var noticeAssetPath android.WritablePath
 	if Bool(a.appProperties.Embed_notices) || ctx.Config().IsEnvTrue("ALWAYS_EMBED_NOTICES") {
@@ -1547,6 +1550,9 @@ type usesLibrary struct {
 
 	// Whether to enforce verify_uses_library check.
 	enforce bool
+
+	// Whether dexpreopt should be disabled
+	shouldDisableDexpreopt bool
 }
 
 func (u *usesLibrary) addLib(lib string, optional bool) {
@@ -1628,6 +1634,15 @@ func (u *usesLibrary) classLoaderContextForUsesLibDeps(ctx android.ModuleContext
 			}
 		}
 
+		// Skip java_sdk_library dependencies that provide stubs, but not an implementation.
+		// This will be restricted to optional_uses_libs
+		if sdklib, ok := m.(SdkLibraryDependency); ok {
+			if tag == usesLibOptTag && sdklib.DexJarBuildPath(ctx).PathOrNil() == nil {
+				u.shouldDisableDexpreopt = true
+				return
+			}
+		}
+
 		if lib, ok := m.(UsesLibraryDependency); ok {
 			libName := dep
 			if ulib, ok := m.(ProvidesUsesLib); ok && ulib.ProvidesUsesLib() != nil {
diff --git a/java/app_import.go b/java/app_import.go
index 12ead0aa2..74255b787 100644
--- a/java/app_import.go
+++ b/java/app_import.go
@@ -319,6 +319,9 @@ func (a *AndroidAppImport) generateAndroidBuildActions(ctx android.ModuleContext
 
 	a.dexpreopter.enforceUsesLibs = a.usesLibrary.enforceUsesLibraries()
 	a.dexpreopter.classLoaderContexts = a.usesLibrary.classLoaderContextForUsesLibDeps(ctx)
+	if a.usesLibrary.shouldDisableDexpreopt {
+		a.dexpreopter.disableDexpreopt()
+	}
 
 	if a.usesLibrary.enforceUsesLibraries() {
 		a.usesLibrary.verifyUsesLibrariesAPK(ctx, srcApk)
diff --git a/java/app_test.go b/java/app_test.go
index 362bef922..125c9716c 100644
--- a/java/app_test.go
+++ b/java/app_test.go
@@ -4378,3 +4378,26 @@ func TestAppFlagsPackages(t *testing.T) {
 		"--feature-flags @out/soong/.intermediates/bar/intermediate.txt --feature-flags @out/soong/.intermediates/baz/intermediate.txt",
 	)
 }
+
+// Test that dexpreopt is disabled if an optional_uses_libs exists, but does not provide an implementation.
+func TestNoDexpreoptOptionalUsesLibDoesNotHaveImpl(t *testing.T) {
+	bp := `
+		java_sdk_library_import {
+			name: "sdklib_noimpl",
+			public: {
+				jars: ["stub.jar"],
+			},
+		}
+		android_app {
+			name: "app",
+			srcs: ["a.java"],
+			sdk_version: "current",
+			optional_uses_libs: [
+				"sdklib_noimpl",
+			],
+		}
+	`
+	result := prepareForJavaTest.RunTestWithBp(t, bp)
+	dexpreopt := result.ModuleForTests("app", "android_common").MaybeRule("dexpreopt").Rule
+	android.AssertBoolEquals(t, "dexpreopt should be disabled if optional_uses_libs does not have an implementation", true, dexpreopt == nil)
+}
diff --git a/java/dexpreopt.go b/java/dexpreopt.go
index 9db9b1b46..1cfa64245 100644
--- a/java/dexpreopt.go
+++ b/java/dexpreopt.go
@@ -102,6 +102,11 @@ type dexpreopter struct {
 	dexpreoptProperties       DexpreoptProperties
 	importDexpreoptProperties ImportDexpreoptProperties
 
+	// If true, the dexpreopt rules will not be generated
+	// Unlike Dex_preopt.Enabled which is user-facing,
+	// shouldDisableDexpreopt is a mutated propery.
+	shouldDisableDexpreopt bool
+
 	installPath         android.InstallPath
 	uncompressedDex     bool
 	isSDKLibrary        bool
@@ -197,6 +202,10 @@ func (d *dexpreopter) dexpreoptDisabled(ctx android.BaseModuleContext, libName s
 		return true
 	}
 
+	if d.shouldDisableDexpreopt {
+		return true
+	}
+
 	// If the module is from a prebuilt APEX, it shouldn't be installable, but it can still be
 	// dexpreopted.
 	if !ctx.Module().(DexpreopterInterface).IsInstallable() && !forPrebuiltApex(ctx) {
@@ -528,3 +537,7 @@ func (d *dexpreopter) AndroidMkEntriesForApex() []android.AndroidMkEntries {
 func (d *dexpreopter) OutputProfilePathOnHost() android.Path {
 	return d.outputProfilePathOnHost
 }
+
+func (d *dexpreopter) disableDexpreopt() {
+	d.shouldDisableDexpreopt = true
+}
diff --git a/java/java.go b/java/java.go
index d7d271cca..576b73b68 100644
--- a/java/java.go
+++ b/java/java.go
@@ -719,6 +719,9 @@ func (j *Library) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 		setUncompressDex(ctx, &j.dexpreopter, &j.dexer)
 		j.dexpreopter.uncompressedDex = *j.dexProperties.Uncompress_dex
 		j.classLoaderContexts = j.usesLibrary.classLoaderContextForUsesLibDeps(ctx)
+		if j.usesLibrary.shouldDisableDexpreopt {
+			j.dexpreopter.disableDexpreopt()
+		}
 	}
 	j.compile(ctx, nil, nil, nil)