diff --git a/tests/expression/1.0/Android.bp b/tests/expression/1.0/Android.bp
index bbb6f33..6209549 100644
--- a/tests/expression/1.0/Android.bp
+++ b/tests/expression/1.0/Android.bp
@@ -66,6 +66,33 @@
 }
 
 genrule {
+    name: "android.hardware.tests.expression-V1.0-java_gen_java",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Ljava -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport android.hardware.tests.expression@1.0",
+    srcs: [
+        ":android.hardware.tests.expression@1.0_hal",
+    ],
+    out: [
+        "android/hardware/tests/expression/V1_0/IExpression.java",
+        "android/hardware/tests/expression/V1_0/IExpressionExt.java",
+    ],
+}
+
+java_library {
+    name: "android.hardware.tests.expression-V1.0-java",
+    no_framework_libs: true,
+    defaults: ["hidl-java-module-defaults"],
+    srcs: [":android.hardware.tests.expression-V1.0-java_gen_java"],
+    libs: [
+        "hwbinder",
+        "android.hidl.base-V1.0-java",
+    ]
+}
+
+// This package does not export any types. Not creating java constants export.
+
+
+genrule {
     name: "android.hardware.tests.expression@1.0-adapter-helper_genc++",
     tools: ["hidl-gen"],
     cmd: "$(location hidl-gen) -o $(genDir) -Lc++-adapter-sources -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport android.hardware.tests.expression@1.0",
@@ -91,7 +118,6 @@
     ],
 }
 
-
 cc_library {
     name: "android.hardware.tests.expression@1.0-adapter-helper",
     defaults: ["hidl-module-defaults"],
diff --git a/tests/expression/1.0/Android.mk b/tests/expression/1.0/Android.mk
deleted file mode 100644
index 7f716fd..0000000
--- a/tests/expression/1.0/Android.mk
+++ /dev/null
@@ -1,64 +0,0 @@
-# This file is autogenerated by hidl-gen. Do not edit manually.
-
-LOCAL_PATH := $(call my-dir)
-
-################################################################################
-
-include $(CLEAR_VARS)
-LOCAL_MODULE := android.hardware.tests.expression-V1.0-java
-LOCAL_MODULE_CLASS := JAVA_LIBRARIES
-
-intermediates := $(call local-generated-sources-dir, COMMON)
-
-HIDL := $(HOST_OUT_EXECUTABLES)/hidl-gen$(HOST_EXECUTABLE_SUFFIX)
-
-LOCAL_JAVA_LIBRARIES := \
-    android.hidl.base-V1.0-java \
-
-LOCAL_NO_STANDARD_LIBRARIES := true
-LOCAL_JAVA_LIBRARIES += core-oj hwbinder
-
-#
-# Build IExpression.hal
-#
-GEN := $(intermediates)/android/hardware/tests/expression/V1_0/IExpression.java
-$(GEN): $(HIDL)
-$(GEN): PRIVATE_HIDL := $(HIDL)
-$(GEN): PRIVATE_DEPS := $(LOCAL_PATH)/IExpression.hal
-$(GEN): PRIVATE_OUTPUT_DIR := $(intermediates)
-$(GEN): PRIVATE_CUSTOM_TOOL = \
-        $(PRIVATE_HIDL) -o $(PRIVATE_OUTPUT_DIR) \
-        -Ljava \
-        -randroid.hardware:hardware/interfaces \
-        -randroid.hidl:system/libhidl/transport \
-        android.hardware.tests.expression@1.0::IExpression
-
-$(GEN): $(LOCAL_PATH)/IExpression.hal
-	$(transform-generated-source)
-LOCAL_GENERATED_SOURCES += $(GEN)
-
-#
-# Build IExpressionExt.hal
-#
-GEN := $(intermediates)/android/hardware/tests/expression/V1_0/IExpressionExt.java
-$(GEN): $(HIDL)
-$(GEN): PRIVATE_HIDL := $(HIDL)
-$(GEN): PRIVATE_DEPS := $(LOCAL_PATH)/IExpressionExt.hal
-$(GEN): PRIVATE_DEPS += $(LOCAL_PATH)/IExpression.hal
-$(GEN): $(LOCAL_PATH)/IExpression.hal
-$(GEN): PRIVATE_OUTPUT_DIR := $(intermediates)
-$(GEN): PRIVATE_CUSTOM_TOOL = \
-        $(PRIVATE_HIDL) -o $(PRIVATE_OUTPUT_DIR) \
-        -Ljava \
-        -randroid.hardware:hardware/interfaces \
-        -randroid.hidl:system/libhidl/transport \
-        android.hardware.tests.expression@1.0::IExpressionExt
-
-$(GEN): $(LOCAL_PATH)/IExpressionExt.hal
-	$(transform-generated-source)
-LOCAL_GENERATED_SOURCES += $(GEN)
-include $(BUILD_JAVA_LIBRARY)
-
-
-
-include $(call all-makefiles-under,$(LOCAL_PATH))