diff --git a/api/Android.bp b/api/Android.bp
index 6a04f0d..89a0c18 100644
--- a/api/Android.bp
+++ b/api/Android.bp
@@ -29,12 +29,14 @@
     pkgPath: "android/soong/api",
     deps: [
         "blueprint",
+        "blueprint-proptools",
         "soong",
         "soong-android",
         "soong-genrule",
         "soong-java",
     ],
     srcs: ["api.go"],
+    testSrcs: ["api_test.go"],
     pluginFor: ["soong_build"],
 }
 
diff --git a/api/api.go b/api/api.go
index d4db49e..f0d1f42 100644
--- a/api/api.go
+++ b/api/api.go
@@ -54,11 +54,11 @@
 // The properties of the combined_apis module type.
 type CombinedApisProperties struct {
 	// Module libraries in the bootclasspath
-	Bootclasspath []string
+	Bootclasspath proptools.Configurable[[]string]
 	// Module libraries on the bootclasspath if include_nonpublic_framework_api is true.
 	Conditional_bootclasspath []string
 	// Module libraries in system server
-	System_server_classpath []string
+	System_server_classpath proptools.Configurable[[]string]
 }
 
 type CombinedApis struct {
@@ -79,29 +79,37 @@
 
 var PrepareForCombinedApisTest = android.FixtureRegisterWithContext(registerBuildComponents)
 
-func (a *CombinedApis) apiFingerprintStubDeps() []string {
+func (a *CombinedApis) bootclasspath(ctx android.ConfigAndErrorContext) []string {
+	return a.properties.Bootclasspath.GetOrDefault(a.ConfigurableEvaluator(ctx), nil)
+}
+
+func (a *CombinedApis) systemServerClasspath(ctx android.ConfigAndErrorContext) []string {
+	return a.properties.System_server_classpath.GetOrDefault(a.ConfigurableEvaluator(ctx), nil)
+}
+
+func (a *CombinedApis) apiFingerprintStubDeps(ctx android.BottomUpMutatorContext) []string {
 	ret := []string{}
 	ret = append(
 		ret,
-		transformArray(a.properties.Bootclasspath, "", ".stubs")...,
+		transformArray(a.bootclasspath(ctx), "", ".stubs")...,
 	)
 	ret = append(
 		ret,
-		transformArray(a.properties.Bootclasspath, "", ".stubs.system")...,
+		transformArray(a.bootclasspath(ctx), "", ".stubs.system")...,
 	)
 	ret = append(
 		ret,
-		transformArray(a.properties.Bootclasspath, "", ".stubs.module_lib")...,
+		transformArray(a.bootclasspath(ctx), "", ".stubs.module_lib")...,
 	)
 	ret = append(
 		ret,
-		transformArray(a.properties.System_server_classpath, "", ".stubs.system_server")...,
+		transformArray(a.systemServerClasspath(ctx), "", ".stubs.system_server")...,
 	)
 	return ret
 }
 
 func (a *CombinedApis) DepsMutator(ctx android.BottomUpMutatorContext) {
-	ctx.AddDependency(ctx.Module(), nil, a.apiFingerprintStubDeps()...)
+	ctx.AddDependency(ctx.Module(), nil, a.apiFingerprintStubDeps(ctx)...)
 }
 
 func (a *CombinedApis) GenerateAndroidBuildActions(ctx android.ModuleContext) {
@@ -532,8 +540,8 @@
 }
 
 func (a *CombinedApis) createInternalModules(ctx android.LoadHookContext) {
-	bootclasspath := a.properties.Bootclasspath
-	system_server_classpath := a.properties.System_server_classpath
+	bootclasspath := a.bootclasspath(ctx)
+	system_server_classpath := a.systemServerClasspath(ctx)
 	if ctx.Config().VendorConfig("ANDROID").Bool("include_nonpublic_framework_api") {
 		bootclasspath = append(bootclasspath, a.properties.Conditional_bootclasspath...)
 		sort.Strings(bootclasspath)
diff --git a/api/api_test.go b/api/api_test.go
new file mode 100644
index 0000000..47d1670
--- /dev/null
+++ b/api/api_test.go
@@ -0,0 +1,254 @@
+// Copyright (C) 2024 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package api
+
+import (
+	"android/soong/android"
+	"android/soong/java"
+	"fmt"
+	"testing"
+
+	"github.com/google/blueprint/proptools"
+)
+
+var prepareForTestWithCombinedApis = android.GroupFixturePreparers(
+	android.FixtureRegisterWithContext(registerBuildComponents),
+	java.PrepareForTestWithJavaBuildComponents,
+	android.FixtureAddTextFile("a/Android.bp", gatherRequiredDepsForTest()),
+	java.PrepareForTestWithJavaSdkLibraryFiles,
+	android.FixtureMergeMockFs(android.MockFS{
+		"a/api/current.txt":            nil,
+		"a/api/removed.txt":            nil,
+		"a/api/system-current.txt":     nil,
+		"a/api/system-removed.txt":     nil,
+		"a/api/test-current.txt":       nil,
+		"a/api/test-removed.txt":       nil,
+		"a/api/module-lib-current.txt": nil,
+		"a/api/module-lib-removed.txt": nil,
+	}),
+	android.FixtureModifyProductVariables(func(variables android.FixtureProductVariables) {
+		variables.Allow_missing_dependencies = proptools.BoolPtr(true)
+	}),
+)
+
+func gatherRequiredDepsForTest() string {
+	var bp string
+
+	extraLibraryModules := []string{
+		"stable.core.platform.api.stubs",
+		"core-lambda-stubs",
+		"core.current.stubs",
+		"ext",
+		"framework",
+		"android_stubs_current.from-text",
+		"android_system_stubs_current.from-text",
+		"android_test_stubs_current.from-text",
+		"android_test_frameworks_core_stubs_current.from-text",
+		"android_module_lib_stubs_current.from-text",
+		"android_system_server_stubs_current.from-text",
+		"android_stubs_current.from-source",
+		"android_system_stubs_current.from-source",
+		"android_test_stubs_current.from-source",
+		"android_test_frameworks_core_stubs_current.from-source",
+		"android_module_lib_stubs_current.from-source",
+		"android_system_server_stubs_current.from-source",
+		"android_stubs_current_exportable.from-source",
+		"android_system_stubs_current_exportable.from-source",
+		"android_test_stubs_current_exportable.from-source",
+		"android_module_lib_stubs_current_exportable.from-source",
+		"android_system_server_stubs_current_exportable.from-source",
+		"stub-annotations",
+	}
+
+	extraSdkLibraryModules := []string{
+		"framework-virtualization",
+		"framework-location",
+	}
+
+	extraSystemModules := []string{
+		"core-public-stubs-system-modules",
+		"core-module-lib-stubs-system-modules",
+		"stable-core-platform-api-stubs-system-modules",
+	}
+
+	extraFilegroupModules := []string{
+		"non-updatable-current.txt",
+		"non-updatable-removed.txt",
+		"non-updatable-system-current.txt",
+		"non-updatable-system-removed.txt",
+		"non-updatable-test-current.txt",
+		"non-updatable-test-removed.txt",
+		"non-updatable-module-lib-current.txt",
+		"non-updatable-module-lib-removed.txt",
+		"non-updatable-system-server-current.txt",
+		"non-updatable-system-server-removed.txt",
+		"non-updatable-exportable-current.txt",
+		"non-updatable-exportable-removed.txt",
+		"non-updatable-exportable-system-current.txt",
+		"non-updatable-exportable-system-removed.txt",
+		"non-updatable-exportable-test-current.txt",
+		"non-updatable-exportable-test-removed.txt",
+		"non-updatable-exportable-module-lib-current.txt",
+		"non-updatable-exportable-module-lib-removed.txt",
+		"non-updatable-exportable-system-server-current.txt",
+		"non-updatable-exportable-system-server-removed.txt",
+	}
+
+	for _, extra := range extraLibraryModules {
+		bp += fmt.Sprintf(`
+			java_library {
+				name: "%s",
+				srcs: ["a.java"],
+				sdk_version: "none",
+				system_modules: "stable-core-platform-api-stubs-system-modules",
+				compile_dex: true,
+			}
+		`, extra)
+	}
+
+	for _, extra := range extraSdkLibraryModules {
+		bp += fmt.Sprintf(`
+			java_sdk_library {
+				name: "%s",
+				srcs: ["a.java"],
+				public: {
+					enabled: true,
+				},
+				system: {
+					enabled: true,
+				},
+				test: {
+					enabled: true,
+				},
+				module_lib: {
+					enabled: true,
+				},
+				api_packages: [
+					"foo",
+				],
+				sdk_version: "core_current",
+				compile_dex: true,
+				annotations_enabled: true,
+			}
+		`, extra)
+	}
+
+	for _, extra := range extraFilegroupModules {
+		bp += fmt.Sprintf(`
+			filegroup {
+				name: "%[1]s",
+			}
+		`, extra)
+	}
+
+	for _, extra := range extraSystemModules {
+		bp += fmt.Sprintf(`
+			java_system_modules {
+				name: "%[1]s",
+				libs: ["%[1]s-lib"],
+			}
+			java_library {
+				name: "%[1]s-lib",
+				sdk_version: "none",
+				system_modules: "none",
+			}
+		`, extra)
+	}
+
+	bp += fmt.Sprintf(`
+		java_defaults {
+			name: "android.jar_defaults",
+		}
+	`)
+
+	return bp
+}
+
+func TestCombinedApisDefaults(t *testing.T) {
+
+	result := android.GroupFixturePreparers(
+		prepareForTestWithCombinedApis,
+		java.FixtureWithLastReleaseApis(
+			"framework-location", "framework-virtualization", "framework-foo", "framework-bar"),
+		android.FixtureModifyProductVariables(func(variables android.FixtureProductVariables) {
+			variables.VendorVars = map[string]map[string]string{
+				"boolean_var": {
+					"for_testing": "true",
+				},
+			}
+		}),
+	).RunTestWithBp(t, `
+		java_sdk_library {
+			name: "framework-foo",
+			srcs: ["a.java"],
+			public: {
+				enabled: true,
+			},
+			system: {
+				enabled: true,
+			},
+			test: {
+				enabled: true,
+			},
+			module_lib: {
+				enabled: true,
+			},
+			api_packages: [
+				"foo",
+			],
+			sdk_version: "core_current",
+			annotations_enabled: true,
+		}
+
+		java_sdk_library {
+			name: "framework-bar",
+			srcs: ["a.java"],
+			public: {
+				enabled: true,
+			},
+			system: {
+				enabled: true,
+			},
+			test: {
+				enabled: true,
+			},
+			module_lib: {
+				enabled: true,
+			},
+			api_packages: [
+				"foo",
+			],
+			sdk_version: "core_current",
+			annotations_enabled: true,
+		}
+
+		combined_apis {
+			name: "foo",
+			bootclasspath: [
+				"framework-bar",
+			] + select(boolean_var_for_testing(), {
+				true: [
+					"framework-foo",
+				],
+				default: [],
+			}),
+		}
+	`)
+
+	subModuleDependsOnSelectAppendedModule := java.CheckModuleHasDependency(t,
+		result.TestContext, "foo-current.txt", "", "framework-foo")
+	android.AssertBoolEquals(t, "Submodule expected to depend on the select-appended module",
+		true, subModuleDependsOnSelectAppendedModule)
+}
diff --git a/api/go.work b/api/go.work
index edd002e..c09bee5 100644
--- a/api/go.work
+++ b/api/go.work
@@ -1,17 +1,17 @@
-go 1.18
+go 1.22
 
 use (
 	.
-	../../../build/soong
 	../../../build/blueprint
+	../../../build/soong
 	../../../external/go-cmp
 	../../../external/golang-protobuf
 )
 
 replace (
 	android/soong v0.0.0 => ../../../build/soong
-	google.golang.org/protobuf v0.0.0 => ../../../external/golang-protobuf
 	github.com/google/blueprint v0.0.0 => ../../../build/blueprint
 	github.com/google/go-cmp v0.0.0 => ../../../external/go-cmp
 	go.starlark.net v0.0.0 => ../../../external/starlark-go
+	google.golang.org/protobuf v0.0.0 => ../../../external/golang-protobuf
 )