diff --git a/java/base.go b/java/base.go
index 8a4c64d..5b7e1df 100644
--- a/java/base.go
+++ b/java/base.go
@@ -222,6 +222,13 @@
 	// the stubs via libs, but should be set to true when the module depends on
 	// the stubs via static libs.
 	Is_stubs_module *bool
+
+	// If true, enable the "Ravenizer" tool on the output jar.
+	// "Ravenizer" is a tool for Ravenwood tests, but it can also be enabled on other kinds
+	// of java targets.
+	Ravenizer struct {
+		Enabled *bool
+	}
 }
 
 // Properties that are specific to device modules. Host module factories should not add these when
@@ -558,6 +565,10 @@
 	// List of soong module dependencies required to compile the current module.
 	// This information is printed out to `Dependencies` field in module_bp_java_deps.json
 	compileDepNames []string
+
+	ravenizer struct {
+		enabled bool
+	}
 }
 
 var _ android.InstallableModule = (*Module)(nil)
@@ -1113,7 +1124,6 @@
 }
 
 func (j *Module) compile(ctx android.ModuleContext, extraSrcJars, extraClasspathJars, extraCombinedJars android.Paths) {
-
 	// Auto-propagating jarjar rules
 	jarjarProviderData := j.collectJarJarRules(ctx)
 	if jarjarProviderData != nil {
@@ -1130,6 +1140,10 @@
 
 	j.exportAidlIncludeDirs = android.PathsForModuleSrc(ctx, j.deviceProperties.Aidl.Export_include_dirs)
 
+	if re := proptools.Bool(j.properties.Ravenizer.Enabled); re {
+		j.ravenizer.enabled = re
+	}
+
 	deps := j.collectDeps(ctx)
 	flags := j.collectBuilderFlags(ctx, deps)
 
@@ -1568,6 +1582,18 @@
 		return
 	}
 
+	if j.ravenizer.enabled {
+		ravenizerInput := outputFile
+		ravenizerOutput := android.PathForModuleOut(ctx, "ravenizer", jarName)
+		ctx.Build(pctx, android.BuildParams{
+			Rule:        ravenizer,
+			Description: "ravenizer",
+			Input:       ravenizerInput,
+			Output:      ravenizerOutput,
+		})
+		outputFile = ravenizerOutput
+	}
+
 	// Check package restrictions if necessary.
 	if len(j.properties.Permitted_packages) > 0 {
 		// Time stamp file created by the package check rule.
diff --git a/java/builder.go b/java/builder.go
index 5d84d0b..02928df 100644
--- a/java/builder.go
+++ b/java/builder.go
@@ -258,6 +258,13 @@
 		},
 	)
 
+	ravenizer = pctx.AndroidStaticRule("ravenizer",
+		blueprint.RuleParams{
+			Command:     "rm -f $out && ${ravenizer} --in-jar $in --out-jar $out",
+			CommandDeps: []string{"${ravenizer}"},
+		},
+	)
+
 	zipalign = pctx.AndroidStaticRule("zipalign",
 		blueprint.RuleParams{
 			Command: "if ! ${config.ZipAlign} -c -p 4 $in > /dev/null; then " +
@@ -307,6 +314,7 @@
 	pctx.Import("android/soong/java/config")
 
 	pctx.HostBinToolVariable("aconfig", "aconfig")
+	pctx.HostBinToolVariable("ravenizer", "ravenizer")
 	pctx.HostBinToolVariable("keep-flagged-apis", "keep-flagged-apis")
 }
 
@@ -746,6 +754,16 @@
 	})
 }
 
+func TransformRavenizer(ctx android.ModuleContext, outputFile android.WritablePath,
+	inputFile android.Path) {
+	ctx.Build(pctx, android.BuildParams{
+		Rule:        ravenizer,
+		Description: "ravenizer",
+		Output:      outputFile,
+		Input:       inputFile,
+	})
+}
+
 func GenerateMainClassManifest(ctx android.ModuleContext, outputFile android.WritablePath, mainClass string) {
 	android.WriteFileRule(ctx, outputFile, "Main-Class: "+mainClass+"\n")
 }
diff --git a/java/ravenwood.go b/java/ravenwood.go
index d65be52..307199a 100644
--- a/java/ravenwood.go
+++ b/java/ravenwood.go
@@ -143,6 +143,9 @@
 		HostTemplate:           "${RavenwoodTestConfigTemplate}",
 	})
 
+	// Always enable Ravenizer for ravenwood tests.
+	r.Library.ravenizer.enabled = true
+
 	r.Library.GenerateAndroidBuildActions(ctx)
 
 	// Start by depending on all files installed by dependencies