diff --git a/Android.bp b/Android.bp
index ba7178955..91e73aab4 100644
--- a/Android.bp
+++ b/Android.bp
@@ -219,6 +219,7 @@ bootstrap_go_package {
         "java/app_builder.go",
         "java/app.go",
         "java/builder.go",
+        "java/dex.go",
         "java/gen.go",
         "java/genrule.go",
         "java/jacoco.go",
diff --git a/java/builder.go b/java/builder.go
index 56c7b3300..dae655d75 100644
--- a/java/builder.go
+++ b/java/builder.go
@@ -135,46 +135,6 @@ var (
 		},
 		"jarArgs")
 
-	desugar = pctx.AndroidStaticRule("desugar",
-		blueprint.RuleParams{
-			Command: `rm -rf $dumpDir && mkdir -p $dumpDir && ` +
-				`${config.JavaCmd} ` +
-				`-Djdk.internal.lambda.dumpProxyClasses=$$(cd $dumpDir && pwd) ` +
-				`$javaFlags ` +
-				`-jar ${config.DesugarJar} $classpathFlags $desugarFlags ` +
-				`-i $in -o $out`,
-			CommandDeps: []string{"${config.DesugarJar}", "${config.JavaCmd}"},
-		},
-		"javaFlags", "classpathFlags", "desugarFlags", "dumpDir")
-
-	dx = pctx.AndroidStaticRule("dx",
-		blueprint.RuleParams{
-			Command: `rm -rf "$outDir" && mkdir -p "$outDir" && ` +
-				`${config.DxCmd} --dex --output=$outDir $dxFlags $in && ` +
-				`${config.SoongZipCmd} -o $outDir/classes.dex.jar -C $outDir -D $outDir && ` +
-				`${config.MergeZipsCmd} -D -stripFile "*.class" $out $outDir/classes.dex.jar $in`,
-			CommandDeps: []string{
-				"${config.DxCmd}",
-				"${config.SoongZipCmd}",
-				"${config.MergeZipsCmd}",
-			},
-		},
-		"outDir", "dxFlags")
-
-	d8 = pctx.AndroidStaticRule("d8",
-		blueprint.RuleParams{
-			Command: `rm -rf "$outDir" && mkdir -p "$outDir" && ` +
-				`${config.D8Cmd} --output $outDir $dxFlags $in && ` +
-				`${config.SoongZipCmd} -o $outDir/classes.dex.jar -C $outDir -D $outDir && ` +
-				`${config.MergeZipsCmd} -D -stripFile "*.class" $out $outDir/classes.dex.jar $in`,
-			CommandDeps: []string{
-				"${config.DxCmd}",
-				"${config.SoongZipCmd}",
-				"${config.MergeZipsCmd}",
-			},
-		},
-		"outDir", "dxFlags")
-
 	jarjar = pctx.AndroidStaticRule("jarjar",
 		blueprint.RuleParams{
 			Command:     "${config.JavaCmd} -jar ${config.JarjarCmd} process $rulesFile $in $out",
@@ -193,7 +153,6 @@ type javaBuilderFlags struct {
 	bootClasspath classpath
 	classpath     classpath
 	systemModules classpath
-	desugarFlags  string
 	aidlFlags     string
 	javaVersion   string
 
@@ -403,64 +362,6 @@ func TransformJarsToJar(ctx android.ModuleContext, outputFile android.WritablePa
 	})
 }
 
-func TransformDesugar(ctx android.ModuleContext, outputFile android.WritablePath,
-	classesJar android.Path, flags javaBuilderFlags) {
-
-	dumpDir := android.PathForModuleOut(ctx, "desugar", "classes")
-
-	javaFlags := ""
-	if ctx.Config().UseOpenJDK9() {
-		javaFlags = "--add-opens java.base/java.lang.invoke=ALL-UNNAMED"
-	}
-
-	var desugarFlags []string
-	desugarFlags = append(desugarFlags, flags.bootClasspath.FormDesugarClasspath("--bootclasspath_entry")...)
-	desugarFlags = append(desugarFlags, flags.classpath.FormDesugarClasspath("--classpath_entry")...)
-
-	var deps android.Paths
-	deps = append(deps, flags.bootClasspath...)
-	deps = append(deps, flags.classpath...)
-
-	ctx.Build(pctx, android.BuildParams{
-		Rule:        desugar,
-		Description: "desugar",
-		Output:      outputFile,
-		Input:       classesJar,
-		Implicits:   deps,
-		Args: map[string]string{
-			"dumpDir":        dumpDir.String(),
-			"javaFlags":      javaFlags,
-			"classpathFlags": strings.Join(desugarFlags, " "),
-			"desugarFlags":   flags.desugarFlags,
-		},
-	})
-}
-
-// Converts a classes.jar file to classes*.dex, then combines the dex files with any resources
-// in the classes.jar file into a dex jar.
-func TransformClassesJarToDexJar(ctx android.ModuleContext, outputFile android.WritablePath,
-	classesJar android.Path, flags javaBuilderFlags) {
-
-	outDir := android.PathForModuleOut(ctx, "dex")
-
-	rule := dx
-	desc := "dx"
-	if ctx.Config().UseD8Desugar() {
-		rule = d8
-		desc = "d8"
-	}
-	ctx.Build(pctx, android.BuildParams{
-		Rule:        rule,
-		Description: desc,
-		Output:      outputFile,
-		Input:       classesJar,
-		Args: map[string]string{
-			"dxFlags": flags.dxFlags,
-			"outDir":  outDir.String(),
-		},
-	})
-}
-
 func TransformJarJar(ctx android.ModuleContext, outputFile android.WritablePath,
 	classesJar android.Path, rulesFile android.Path) {
 	ctx.Build(pctx, android.BuildParams{
diff --git a/java/config/config.go b/java/config/config.go
index c43f9a38a..930e65e42 100644
--- a/java/config/config.go
+++ b/java/config/config.go
@@ -106,13 +106,9 @@ func init() {
 			return path.String(), nil
 		}
 	})
-	pctx.VariableFunc("D8Cmd", func(config android.Config) (string, error) {
-		path, err := pctx.HostBinToolPath(config, "d8")
-		if err != nil {
-			return "", err
-		}
-		return path.String(), nil
-	})
+
+	pctx.HostBinToolVariable("D8Cmd", "d8")
+
 	pctx.VariableFunc("TurbineJar", func(config android.Config) (string, error) {
 		turbine := "turbine.jar"
 		if config.UnbundledBuild() {
diff --git a/java/dex.go b/java/dex.go
new file mode 100644
index 000000000..fa5c2eea2
--- /dev/null
+++ b/java/dex.go
@@ -0,0 +1,181 @@
+// Copyright 2017 Google Inc. All rights reserved.
+//
+// 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 java
+
+import (
+	"strings"
+
+	"github.com/google/blueprint"
+
+	"android/soong/android"
+)
+
+var desugar = pctx.AndroidStaticRule("desugar",
+	blueprint.RuleParams{
+		Command: `rm -rf $dumpDir && mkdir -p $dumpDir && ` +
+			`${config.JavaCmd} ` +
+			`-Djdk.internal.lambda.dumpProxyClasses=$$(cd $dumpDir && pwd) ` +
+			`$javaFlags ` +
+			`-jar ${config.DesugarJar} $classpathFlags $desugarFlags ` +
+			`-i $in -o $out`,
+		CommandDeps: []string{"${config.DesugarJar}", "${config.JavaCmd}"},
+	},
+	"javaFlags", "classpathFlags", "desugarFlags", "dumpDir")
+
+func (j *Module) desugar(ctx android.ModuleContext, flags javaBuilderFlags,
+	classesJar android.Path, jarName string) android.Path {
+
+	desugarFlags := []string{
+		"--min_sdk_version " + j.minSdkVersionNumber(ctx),
+		"--desugar_try_with_resources_if_needed=false",
+		"--allow_empty_bootclasspath",
+	}
+
+	if inList("--core-library", j.deviceProperties.Dxflags) {
+		desugarFlags = append(desugarFlags, "--core_library")
+	}
+
+	desugarJar := android.PathForModuleOut(ctx, "desugar", jarName)
+	dumpDir := android.PathForModuleOut(ctx, "desugar", "classes")
+
+	javaFlags := ""
+	if ctx.Config().UseOpenJDK9() {
+		javaFlags = "--add-opens java.base/java.lang.invoke=ALL-UNNAMED"
+	}
+
+	var classpathFlags []string
+	classpathFlags = append(classpathFlags, flags.bootClasspath.FormDesugarClasspath("--bootclasspath_entry")...)
+	classpathFlags = append(classpathFlags, flags.classpath.FormDesugarClasspath("--classpath_entry")...)
+
+	var deps android.Paths
+	deps = append(deps, flags.bootClasspath...)
+	deps = append(deps, flags.classpath...)
+
+	ctx.Build(pctx, android.BuildParams{
+		Rule:        desugar,
+		Description: "desugar",
+		Output:      desugarJar,
+		Input:       classesJar,
+		Implicits:   deps,
+		Args: map[string]string{
+			"dumpDir":        dumpDir.String(),
+			"javaFlags":      javaFlags,
+			"classpathFlags": strings.Join(classpathFlags, " "),
+			"desugarFlags":   strings.Join(desugarFlags, " "),
+		},
+	})
+
+	return desugarJar
+}
+
+var dx = pctx.AndroidStaticRule("dx",
+	blueprint.RuleParams{
+		Command: `rm -rf "$outDir" && mkdir -p "$outDir" && ` +
+			`${config.DxCmd} --dex --output=$outDir $dxFlags $in && ` +
+			`${config.SoongZipCmd} -o $outDir/classes.dex.jar -C $outDir -D $outDir && ` +
+			`${config.MergeZipsCmd} -D -stripFile "*.class" $out $outDir/classes.dex.jar $in`,
+		CommandDeps: []string{
+			"${config.DxCmd}",
+			"${config.SoongZipCmd}",
+			"${config.MergeZipsCmd}",
+		},
+	},
+	"outDir", "dxFlags")
+
+var d8 = pctx.AndroidStaticRule("d8",
+	blueprint.RuleParams{
+		Command: `rm -rf "$outDir" && mkdir -p "$outDir" && ` +
+			`${config.D8Cmd} --output $outDir $dxFlags $in && ` +
+			`${config.SoongZipCmd} -o $outDir/classes.dex.jar -C $outDir -D $outDir && ` +
+			`${config.MergeZipsCmd} -D -stripFile "*.class" $out $outDir/classes.dex.jar $in`,
+		CommandDeps: []string{
+			"${config.D8Cmd}",
+			"${config.SoongZipCmd}",
+			"${config.MergeZipsCmd}",
+		},
+	},
+	"outDir", "dxFlags")
+
+func (j *Module) dxFlags(ctx android.ModuleContext, fullD8 bool) []string {
+	flags := j.deviceProperties.Dxflags
+	if fullD8 {
+		// Translate all the DX flags to D8 ones until all the build files have been migrated
+		// to D8 flags. See: b/69377755
+		flags = android.RemoveListFromList(flags,
+			[]string{"--core-library", "--dex", "--multi-dex"})
+	}
+
+	if ctx.Config().Getenv("NO_OPTIMIZE_DX") != "" {
+		if fullD8 {
+			flags = append(flags, "--debug")
+		} else {
+			flags = append(flags, "--no-optimize")
+		}
+	}
+
+	if ctx.Config().Getenv("GENERATE_DEX_DEBUG") != "" {
+		flags = append(flags,
+			"--debug",
+			"--verbose")
+		if !fullD8 {
+			flags = append(flags,
+				"--dump-to="+android.PathForModuleOut(ctx, "classes.lst").String(),
+				"--dump-width=1000")
+		}
+	}
+
+	if fullD8 {
+		flags = append(flags, "--min-api "+j.minSdkVersionNumber(ctx))
+	} else {
+		flags = append(flags, "--min-sdk-version="+j.minSdkVersionNumber(ctx))
+	}
+	return flags
+}
+
+func (j *Module) compileDex(ctx android.ModuleContext, flags javaBuilderFlags,
+	classesJar android.Path, jarName string) android.Path {
+
+	fullD8 := ctx.Config().UseD8Desugar()
+
+	if !fullD8 {
+		classesJar = j.desugar(ctx, flags, classesJar, jarName)
+	}
+
+	dxFlags := j.dxFlags(ctx, fullD8)
+
+	// Compile classes.jar into classes.dex and then javalib.jar
+	javalibJar := android.PathForModuleOut(ctx, "dex", jarName)
+	outDir := android.PathForModuleOut(ctx, "dex")
+
+	rule := dx
+	desc := "dx"
+	if fullD8 {
+		rule = d8
+		desc = "d8"
+	}
+	ctx.Build(pctx, android.BuildParams{
+		Rule:        rule,
+		Description: desc,
+		Output:      javalibJar,
+		Input:       classesJar,
+		Args: map[string]string{
+			"dxFlags": strings.Join(dxFlags, " "),
+			"outDir":  outDir.String(),
+		},
+	})
+
+	j.dexJarFile = javalibJar
+	return javalibJar
+}
diff --git a/java/java.go b/java/java.go
index 7daa8f2ef..f06d81d7a 100644
--- a/java/java.go
+++ b/java/java.go
@@ -700,7 +700,6 @@ func (j *Module) compile(ctx android.ModuleContext, extraSrcJars ...android.Path
 	// Store the list of .java files that was passed to javac
 	j.compiledJavaSrcs = uniqueSrcFiles
 	j.compiledSrcJars = srcJars
-	fullD8 := ctx.Config().UseD8Desugar()
 
 	enable_sharding := false
 	if ctx.Device() && !ctx.Config().IsEnvFalse("TURBINE_ENABLED") {
@@ -840,12 +839,7 @@ func (j *Module) compile(ctx android.ModuleContext, extraSrcJars ...android.Path
 	}
 
 	if ctx.Device() && j.installable() {
-		if fullD8 {
-			outputFile = j.compileDexFullD8(ctx, flags, outputFile, jarName)
-		} else {
-			outputFile = j.desugar(ctx, flags, outputFile, jarName)
-			outputFile = j.compileDex(ctx, flags, outputFile, jarName)
-		}
+		outputFile = j.compileDex(ctx, flags, outputFile, jarName)
 		if ctx.Failed() {
 			return
 		}
@@ -893,27 +887,6 @@ func (j *Module) compileJavaHeader(ctx android.ModuleContext, srcFiles, srcJars
 	return headerJar
 }
 
-func (j *Module) desugar(ctx android.ModuleContext, flags javaBuilderFlags,
-	classesJar android.Path, jarName string) android.Path {
-
-	desugarFlags := []string{
-		"--min_sdk_version " + j.minSdkVersionNumber(ctx),
-		"--desugar_try_with_resources_if_needed=false",
-		"--allow_empty_bootclasspath",
-	}
-
-	if inList("--core-library", j.deviceProperties.Dxflags) {
-		desugarFlags = append(desugarFlags, "--core_library")
-	}
-
-	flags.desugarFlags = strings.Join(desugarFlags, " ")
-
-	desugarJar := android.PathForModuleOut(ctx, "desugar", jarName)
-	TransformDesugar(ctx, desugarJar, classesJar, flags)
-
-	return desugarJar
-}
-
 func (j *Module) instrument(ctx android.ModuleContext, flags javaBuilderFlags,
 	classesJar android.Path, jarName string) android.Path {
 
@@ -929,72 +902,6 @@ func (j *Module) instrument(ctx android.ModuleContext, flags javaBuilderFlags,
 	return instrumentedJar
 }
 
-func (j *Module) compileDex(ctx android.ModuleContext, flags javaBuilderFlags,
-	classesJar android.Path, jarName string) android.Path {
-
-	dxFlags := j.deviceProperties.Dxflags
-
-	if ctx.Config().Getenv("NO_OPTIMIZE_DX") != "" {
-		dxFlags = append(dxFlags, "--no-optimize")
-	}
-
-	if ctx.Config().Getenv("GENERATE_DEX_DEBUG") != "" {
-		dxFlags = append(dxFlags,
-			"--debug",
-			"--verbose",
-			"--dump-to="+android.PathForModuleOut(ctx, "classes.lst").String(),
-			"--dump-width=1000")
-	}
-
-	dxFlags = append(dxFlags, "--min-sdk-version="+j.minSdkVersionNumber(ctx))
-
-	flags.dxFlags = strings.Join(dxFlags, " ")
-
-	// Compile classes.jar into classes.dex and then javalib.jar
-	javalibJar := android.PathForModuleOut(ctx, "dex", jarName)
-	TransformClassesJarToDexJar(ctx, javalibJar, classesJar, flags)
-
-	j.dexJarFile = javalibJar
-	return javalibJar
-}
-
-func (j *Module) compileDexFullD8(ctx android.ModuleContext, flags javaBuilderFlags,
-	classesJar android.Path, jarName string) android.Path {
-
-	// Translate all the DX flags to D8 ones until all the build files have been migrated
-	// to D8 flags. See: b/69377755
-	var dxFlags []string
-	for _, x := range j.deviceProperties.Dxflags {
-		switch x {
-		case "--core-library", "--dex", "--multi-dex":
-			continue
-		default:
-			dxFlags = append(dxFlags, x)
-		}
-	}
-
-	if ctx.AConfig().Getenv("NO_OPTIMIZE_DX") != "" {
-		dxFlags = append(dxFlags, "--debug")
-	}
-
-	if ctx.AConfig().Getenv("GENERATE_DEX_DEBUG") != "" {
-		dxFlags = append(dxFlags,
-			"--debug",
-			"--verbose")
-	}
-
-	dxFlags = append(dxFlags, "--min-api "+j.minSdkVersionNumber(ctx))
-
-	flags.dxFlags = strings.Join(dxFlags, " ")
-
-	// Compile classes.jar into classes.dex and then javalib.jar
-	javalibJar := android.PathForModuleOut(ctx, "dex", jarName)
-	TransformClassesJarToDexJar(ctx, javalibJar, classesJar, flags)
-
-	j.dexJarFile = javalibJar
-	return javalibJar
-}
-
 // Returns a sdk version as a string that is guaranteed to be a parseable as a number.  For
 // modules targeting an unreleased SDK (meaning it does not yet have a number) it returns "10000".
 func (j *Module) minSdkVersionNumber(ctx android.ModuleContext) string {