diff --git a/java/dexpreopt_config.go b/java/dexpreopt_config.go
index a1a9a76..f776b45 100644
--- a/java/dexpreopt_config.go
+++ b/java/dexpreopt_config.go
@@ -22,12 +22,56 @@
 	"android/soong/dexpreopt"
 )
 
+// dexpreoptGlobalConfig returns the global dexpreopt.config.  It is loaded once the first time it is called for any
+// ctx.Config(), and returns the same data for all future calls with the same ctx.Config().  A value can be inserted
+// for tests using setDexpreoptTestGlobalConfig.
+func dexpreoptGlobalConfig(ctx android.PathContext) dexpreopt.GlobalConfig {
+	return dexpreoptGlobalConfigRaw(ctx).global
+}
+
+type globalConfigAndRaw struct {
+	global dexpreopt.GlobalConfig
+	data   []byte
+}
+
+func dexpreoptGlobalConfigRaw(ctx android.PathContext) globalConfigAndRaw {
+	return ctx.Config().Once(dexpreoptGlobalConfigKey, func() interface{} {
+		if data, err := ctx.Config().DexpreoptGlobalConfig(ctx); err != nil {
+			panic(err)
+		} else if data != nil {
+			globalConfig, err := dexpreopt.LoadGlobalConfig(ctx, data)
+			if err != nil {
+				panic(err)
+			}
+			return globalConfigAndRaw{globalConfig, data}
+		}
+
+		// No global config filename set, see if there is a test config set
+		return ctx.Config().Once(dexpreoptTestGlobalConfigKey, func() interface{} {
+			// Nope, return a config with preopting disabled
+			return globalConfigAndRaw{dexpreopt.GlobalConfig{
+				DisablePreopt:          true,
+				DisableGenerateProfile: true,
+			}, nil}
+		})
+	}).(globalConfigAndRaw)
+}
+
+// setDexpreoptTestGlobalConfig sets a GlobalConfig that future calls to dexpreoptGlobalConfig will return.  It must
+// be called before the first call to dexpreoptGlobalConfig for the config.
+func setDexpreoptTestGlobalConfig(config android.Config, globalConfig dexpreopt.GlobalConfig) {
+	config.Once(dexpreoptTestGlobalConfigKey, func() interface{} { return globalConfigAndRaw{globalConfig, nil} })
+}
+
+var dexpreoptGlobalConfigKey = android.NewOnceKey("DexpreoptGlobalConfig")
+var dexpreoptTestGlobalConfigKey = android.NewOnceKey("TestDexpreoptGlobalConfig")
+
 // systemServerClasspath returns the on-device locations of the modules in the system server classpath.  It is computed
 // once the first time it is called for any ctx.Config(), and returns the same slice for all future calls with the same
 // ctx.Config().
 func systemServerClasspath(ctx android.PathContext) []string {
 	return ctx.Config().OnceStringSlice(systemServerClasspathKey, func() []string {
-		global := dexpreopt.GetGlobalConfig(ctx)
+		global := dexpreoptGlobalConfig(ctx)
 
 		var systemServerClasspathLocations []string
 		for _, m := range global.SystemServerJars {
@@ -88,7 +132,7 @@
 func genBootImageConfigs(ctx android.PathContext) map[string]*bootImageConfig {
 	return ctx.Config().Once(bootImageConfigKey, func() interface{} {
 
-		global := dexpreopt.GetGlobalConfig(ctx)
+		global := dexpreoptGlobalConfig(ctx)
 		targets := dexpreoptTargets(ctx)
 		deviceDir := android.PathForOutput(ctx, ctx.Config().DeviceName())
 
@@ -229,7 +273,7 @@
 
 func defaultBootclasspath(ctx android.PathContext) []string {
 	return ctx.Config().OnceStringSlice(defaultBootclasspathKey, func() []string {
-		global := dexpreopt.GetGlobalConfig(ctx)
+		global := dexpreoptGlobalConfig(ctx)
 		image := defaultBootImageConfig(ctx)
 
 		updatableBootclasspath := make([]string, len(global.UpdatableBootJars))