diff --git a/core/base_rules.mk b/core/base_rules.mk
index 883f330..8e423e4 100644
--- a/core/base_rules.mk
+++ b/core/base_rules.mk
@@ -409,6 +409,7 @@
 $(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_RESOURCE_DIR := $(LOCAL_RESOURCE_DIR)
 $(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_ASSET_DIR := $(LOCAL_ASSET_DIR)
 $(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_STATIC_JAVA_LIBRARIES := $(full_static_java_libs)
+$(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_STATIC_JACK_LIBRARIES := $(full_static_jack_libs)
 
 # full_java_libs: The list of files that should be used as the classpath.
 #                 Using this list as a dependency list WILL NOT WORK.
@@ -681,7 +682,7 @@
 ###########################################################
 # JACK
 ###########################################################
-ifeq ($(LOCAL_USE_JACK),true)
+ifeq ($(strip $(LOCAL_USE_JACK)),true)
 ifdef need_compile_java
 
 full_static_jack_libs := \
diff --git a/core/definitions.mk b/core/definitions.mk
index f7b6b95..e38e36d 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -1702,7 +1702,6 @@
         jar -cfm $@ $(dir $@)/manifest.mf \
             -C $(PRIVATE_CLASS_INTERMEDIATES_DIR) ., \
     $(hide) jar -cf $@ -C $(PRIVATE_CLASS_INTERMEDIATES_DIR) .)
-$(if $(PRIVATE_EXTRA_JAR_ARGS),$(call add-java-resources-to,$@))
 endef
 
 define transform-java-to-classes.jar
@@ -1734,12 +1733,6 @@
     $(hide) echo -basedirectory $(CURDIR) > $@.flags; \
     echo $(PRIVATE_JACK_PROGUARD_FLAGS) >> $@.flags; \
 )
-$(if $(PRIVATE_EXTRA_JAR_ARGS),
-    $(hide) mkdir -p $@.res.tmp
-    $(hide) $(call create-empty-package-at,$@.res.tmp.zip)
-    $(hide) $(call add-java-resources-to,$@.res.tmp.zip)
-    $(hide) $(call unzip-jar-files,$@.res.tmp.zip,$@.res.tmp)
-    $(hide) rm $@.res.tmp.zip)
 $(hide) if [ -s $(PRIVATE_JACK_INTERMEDIATES_DIR)/java-source-list-uniq ] ; then \
     export tmpEcjArg="@$(PRIVATE_JACK_INTERMEDIATES_DIR)/java-source-list-uniq"; \
 else \
@@ -1753,7 +1746,6 @@
     $(addprefix --classpath ,$(strip \
         $(call normalize-path-list,$(PRIVATE_BOOTCLASSPATH_JAVA_LIBRARIES) $(PRIVATE_ALL_JACK_LIBRARIES)))) \
     $(addprefix --import ,$(call reverse-list,$(PRIVATE_STATIC_JACK_LIBRARIES))) \
-    $(if $(PRIVATE_EXTRA_JAR_ARGS),--import-resource $@.res.tmp) \
     -D jack.import.resource.policy=keep-first \
     -D jack.import.type.policy=keep-first \
     --output-jack $(PRIVATE_CLASSES_JACK) \
@@ -1765,7 +1757,6 @@
     || ( rm -rf $(PRIVATE_CLASSES_JACK); rm -rf $(PRIVATE_JACK_INTERMEDIATES_DIR); exit 41 )
 $(hide) mv $(PRIVATE_JACK_INTERMEDIATES_DIR)/classes*.dex $(dir $@)
 $(hide) rm -f $(PRIVATE_JACK_INTERMEDIATES_DIR)/java-source-list
-$(if $(PRIVATE_EXTRA_JAR_ARGS),$(hide) rm -rf $@.res.tmp)
 $(hide) mv $(PRIVATE_JACK_INTERMEDIATES_DIR)/java-source-list-uniq $(PRIVATE_JACK_INTERMEDIATES_DIR).java-source-list
 $(if $(PRIVATE_JAR_PACKAGES), $(hide) echo unsupported options PRIVATE_JAR_PACKAGES in $@; exit 53)
 $(if $(PRIVATE_JAR_EXCLUDE_PACKAGES), $(hide) echo unsupported options JAR_EXCLUDE_PACKAGES in $@; exit 53)
@@ -1899,7 +1890,6 @@
         jar -cfm $@ $(dir $@)/manifest.mf \
             -C $(PRIVATE_CLASS_INTERMEDIATES_DIR) ., \
     $(hide) jar -cf $@ -C $(PRIVATE_CLASS_INTERMEDIATES_DIR) .)
-$(if $(PRIVATE_EXTRA_JAR_ARGS),$(call add-java-resources-to,$@))
 $(hide) mv $(PRIVATE_CLASS_INTERMEDIATES_DIR)/newstamp $(PRIVATE_CLASS_INTERMEDIATES_DIR)/stamp
 endef
 
@@ -1955,15 +1945,6 @@
 $(call create-empty-package-at,$@)
 endef
 
-# Copy an arhchive file and delete any class files and empty folders inside.
-# $(1): the source archive file.
-# $(2): the destination archive file.
-define initialize-package-file
-@mkdir -p $(dir $(2))
-$(hide) cp -f $(1) $(2)
-$(hide) zip -qd $(2) "*.class" && zip -qd $(2) "*/"
-endef
-
 #TODO: we kinda want to build different asset packages for
 #      different configurations, then combine them later (or something).
 #      Per-locale, etc.
@@ -2023,6 +2004,25 @@
 @rm -f $(1).jar-arg-list
 endef
 
+# Add java resources added by the current module.
+#
+define add-java-resources-to-package
+$(call add-java-resources-to,$@)
+endef
+
+# Add java resources carried by static Java libraries.
+#
+define add-carried-java-resources
+$(hide) if [ -d $(PRIVATE_CLASS_INTERMEDIATES_DIR) ] ; then \
+    java_res_jar_flags=$$(find $(PRIVATE_CLASS_INTERMEDIATES_DIR) -type f -a -not -name "*.class" \
+        | sed -e "s?^$(PRIVATE_CLASS_INTERMEDIATES_DIR)/? -C $(PRIVATE_CLASS_INTERMEDIATES_DIR) ?"); \
+    if [ -n "$$java_res_jar_flags" ] ; then \
+        echo $$java_res_jar_flags >$(dir $@)java_res_jar_flags; \
+        jar uf $@ $$java_res_jar_flags; \
+    fi; \
+fi
+endef
+
 # Add resources carried by static Jack libraries.
 #
 define add-carried-jack-resources
@@ -2036,6 +2036,7 @@
 fi
 endef
 
+
 # Sign a package using the specified key/cert.
 #
 define sign-package
@@ -2077,6 +2078,7 @@
 define transform-host-java-to-package
 @echo "host Java: $(PRIVATE_MODULE) ($(PRIVATE_CLASS_INTERMEDIATES_DIR))"
 $(call compile-java,$(HOST_JAVAC),$(PRIVATE_BOOTCLASSPATH))
+$(if $(PRIVATE_EXTRA_JAR_ARGS), $(call add-java-resources-to-package))
 endef
 
 ###########################################################
diff --git a/core/dpi_specific_apk.mk b/core/dpi_specific_apk.mk
index 11c7c84..aad4713 100644
--- a/core/dpi_specific_apk.mk
+++ b/core/dpi_specific_apk.mk
@@ -25,31 +25,24 @@
 $(built_dpi_apk): PRIVATE_MANIFEST_INSTRUMENTATION_FOR := $(LOCAL_INSTRUMENTATION_FOR)
 $(built_dpi_apk): PRIVATE_JNI_SHARED_LIBRARIES := $(jni_shared_libraries_with_abis)
 $(built_dpi_apk): PRIVATE_JNI_SHARED_LIBRARIES_ABI := $(jni_shared_libraries_abis)
+$(built_dpi_apk): PRIVATE_DEX_FILE := $(built_dex)
+# Note that PRIVATE_CLASS_INTERMEDIATES_DIR points to the base apk's intermediate dir.
+$(built_dpi_apk): PRIVATE_CLASS_INTERMEDIATES_DIR := $(intermediates)/classes
+$(built_dpi_apk): PRIVATE_EXTRA_JAR_ARGS := $(extra_jar_args)
 $(built_dpi_apk): PRIVATE_PRIVATE_KEY := $(private_key)
 $(built_dpi_apk): PRIVATE_CERTIFICATE := $(certificate)
 $(built_dpi_apk): PRIVATE_ADDITIONAL_CERTIFICATES := $(foreach c,\
     $(LOCAL_ADDITIONAL_CERTIFICATES), $(c).x509.pem $(c).pk8)
 
-ifneq ($(full_classes_jar),)
-$(built_dpi_apk): PRIVATE_DEX_FILE := $(built_dex)
-# Use the jarjar processed arhive as the initial package file.
-$(built_dpi_apk): PRIVATE_SOURCE_ARCHIVE := $(full_classes_jarjar_jar)
-$(built_dpi_apk): $(built_dex)
-else
-$(built_dpi_apk): PRIVATE_DEX_FILE :=
-$(built_dpi_apk): PRIVATE_SOURCE_ARCHIVE :=
-endif # full_classes_jar
-
 # Set up dependenncies and the build recipe.
 $(built_dpi_apk) : $(R_file_stamp)
 $(built_dpi_apk) : $(all_library_res_package_export_deps)
+$(built_dpi_apk) : $(built_dex)
 $(built_dpi_apk) : $(private_key) $(certificate) $(SIGNAPK_JAR)
 $(built_dpi_apk) : $(AAPT) | $(ZIPALIGN)
 $(built_dpi_apk) : $(all_res_assets) $(jni_shared_libraries) $(full_android_manifest)
 	@echo "target Package: $(PRIVATE_MODULE) ($@)"
-	$(if $(PRIVATE_SOURCE_ARCHIVE),\
-	  $(call initialize-package-file,$(PRIVATE_SOURCE_ARCHIVE),$@),\
-	  $(create-empty-package))
+	$(create-empty-package)
 	$(add-assets-to-package)
 ifneq ($(jni_shared_libraries),)
 	$(add-jni-shared-libs-to-package)
@@ -57,6 +50,10 @@
 ifneq ($(full_classes_jar),)
 	$(add-dex-to-package)
 endif
+	$(add-carried-java-resources)
+ifneq ($(extra_jar_args),)
+	$(add-java-resources-to-package)
+endif
 	$(sign-package)
 	$(align-package)
 
diff --git a/core/host_dalvik_java_library.mk b/core/host_dalvik_java_library.mk
index c13784c..dc8be5e 100644
--- a/core/host_dalvik_java_library.mk
+++ b/core/host_dalvik_java_library.mk
@@ -101,18 +101,21 @@
 	@echo Copying: $@
 	$(hide) $(ACP) -fp $< $@
 
-ifneq ($(LOCAL_USE_JACK),true)
+ifneq ($(strip $(LOCAL_USE_JACK)),true)
 $(built_dex): PRIVATE_INTERMEDIATES_DIR := $(intermediates.COMMON)
 $(built_dex): PRIVATE_DX_FLAGS := $(LOCAL_DX_FLAGS)
 $(built_dex): $(full_classes_jar) $(DX)
 	$(transform-classes.jar-to-dex)
 
 $(LOCAL_BUILT_MODULE): PRIVATE_DEX_FILE := $(built_dex)
-$(LOCAL_BUILT_MODULE): PRIVATE_SOURCE_ARCHIVE := $(full_classes_jarjar_jar)
 $(LOCAL_BUILT_MODULE): $(built_dex) $(java_resource_sources)
 	@echo "Host Jar: $(PRIVATE_MODULE) ($@)"
-	$(call initialize-package-file,$(PRIVATE_SOURCE_ARCHIVE),$@)
+	$(create-empty-package)
 	$(add-dex-to-package)
+	$(add-carried-java-resources)
+ifneq ($(extra_jar_args),)
+	$(add-java-resources-to-package)
+endif
 
 else # LOCAL_USE_JACK
 $(LOCAL_INTERMEDIATE_TARGETS): \
@@ -135,6 +138,9 @@
 	$(create-empty-package)
 	$(add-dex-to-package)
 	$(add-carried-jack-resources)
+ifneq ($(extra_jar_args),)
+	$(add-java-resources-to-package)
+endif
 
 endif # LOCAL_USE_JACK
 
diff --git a/core/java.mk b/core/java.mk
index e0864ae..a2bd00b 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -474,7 +474,7 @@
     -verbose \
     $(legacy_proguard_flags)
 # not supported with jack
-ifeq ($(LOCAL_USE_JACK),true)
+ifeq ($(strip $(LOCAL_USE_JACK)),true)
     $(error $(LOCAL_MODULE): Build with jack of instrumentation when obfuscating is not yet supported)
 endif
 
@@ -565,7 +565,7 @@
 
 endif  # full_classes_jar is defined
 
-ifeq ($(LOCAL_USE_JACK),true)
+ifeq ($(strip $(LOCAL_USE_JACK)),true)
 $(LOCAL_INTERMEDIATE_TARGETS): \
 	PRIVATE_JACK_INTERMEDIATES_DIR := $(intermediates.COMMON)/jack
 
diff --git a/core/java_library.mk b/core/java_library.mk
index 586172b..0930234 100644
--- a/core/java_library.mk
+++ b/core/java_library.mk
@@ -58,6 +58,9 @@
 endif
 	@echo "target Static Jar: $(PRIVATE_MODULE) ($@)"
 	$(copy-file-to-target)
+ifneq ($(extra_jar_args),)
+	$(add-java-resources-to-package)
+endif
 
 $(LOCAL_BUILT_MODULE): $(common_javalib.jar)
 	$(copy-file-to-target)
@@ -65,18 +68,18 @@
 else # !LOCAL_IS_STATIC_JAVA_LIBRARY
 
 $(common_javalib.jar): PRIVATE_DEX_FILE := $(built_dex)
-$(common_javalib.jar): PRIVATE_SOURCE_ARCHIVE := $(full_classes_jarjar_jar)
 $(common_javalib.jar) : $(built_dex) $(java_resource_sources)
 	@echo "target Jar: $(PRIVATE_MODULE) ($@)"
-ifeq ($(LOCAL_USE_JACK),true)
 	$(create-empty-package)
-else
-	$(call initialize-package-file,$(PRIVATE_SOURCE_ARCHIVE),$@)
-endif
 	$(add-dex-to-package)
-ifeq ($(LOCAL_USE_JACK),true)
+ifneq ($(strip $(LOCAL_USE_JACK)),true)
+	$(add-carried-java-resources)
+else
 	$(add-carried-jack-resources)
 endif
+ifneq ($(extra_jar_args),)
+	$(add-java-resources-to-package)
+endif
 
 ifdef LOCAL_DEX_PREOPT
 ifneq ($(dexpreopt_boot_jar_module),) # boot jar
diff --git a/core/package_internal.mk b/core/package_internal.mk
index 059f121..898a8df 100644
--- a/core/package_internal.mk
+++ b/core/package_internal.mk
@@ -162,7 +162,7 @@
 endif # !custom
 LOCAL_PROGUARD_FLAGS := $(addprefix -include ,$(proguard_options_file)) $(LOCAL_PROGUARD_FLAGS)
 
-ifeq ($(LOCAL_USE_JACK),true)
+ifeq ($(strip $(LOCAL_USE_JACK)),true)
 ifndef LOCAL_JACK_PROGUARD_FLAGS
     LOCAL_JACK_PROGUARD_FLAGS := $(LOCAL_PROGUARD_FLAGS)
 endif
@@ -278,7 +278,7 @@
 # they want to use this module's R.java file.
 $(LOCAL_BUILT_MODULE): $(R_file_stamp)
 
-ifeq ($(LOCAL_USE_JACK),true)
+ifeq ($(strip $(LOCAL_USE_JACK)),true)
 ifneq ($(built_dex_intermediate),)
 $(built_dex_intermediate): $(R_file_stamp)
 endif
@@ -339,12 +339,7 @@
 
 ifneq ($(full_classes_jar),)
 $(LOCAL_BUILT_MODULE): PRIVATE_DEX_FILE := $(built_dex)
-# Use the jarjar processed arhive as the initial package file.
-$(LOCAL_BUILT_MODULE): PRIVATE_SOURCE_ARCHIVE := $(full_classes_jarjar_jar)
 $(LOCAL_BUILT_MODULE): $(built_dex)
-else
-$(LOCAL_BUILT_MODULE): PRIVATE_DEX_FILE :=
-$(LOCAL_BUILT_MODULE): PRIVATE_SOURCE_ARCHIVE :=
 endif # full_classes_jar
 
 include $(BUILD_SYSTEM)/install_jni_libs.mk
@@ -405,13 +400,7 @@
 endif
 $(LOCAL_BUILT_MODULE): $(all_res_assets) $(jni_shared_libraries) $(full_android_manifest)
 	@echo "target Package: $(PRIVATE_MODULE) ($@)"
-ifeq ($(LOCAL_USE_JACK),true)
 	$(create-empty-package)
-else
-	$(if $(PRIVATE_SOURCE_ARCHIVE),\
-	  $(call initialize-package-file,$(PRIVATE_SOURCE_ARCHIVE),$@),\
-	  $(create-empty-package))
-endif
 	$(add-assets-to-package)
 ifneq ($(jni_shared_libraries),)
 	$(add-jni-shared-libs-to-package)
@@ -419,9 +408,14 @@
 ifneq ($(full_classes_jar),)
 	$(add-dex-to-package)
 endif
-ifeq ($(LOCAL_USE_JACK),true)
+ifneq ($(strip $(LOCAL_USE_JACK)),true)
+	$(add-carried-java-resources)
+else
 	$(add-carried-jack-resources)
 endif
+ifneq ($(extra_jar_args),)
+	$(add-java-resources-to-package)
+endif
 	$(sign-package)
 ifdef LOCAL_DEX_PREOPT
 ifneq (nostripping,$(LOCAL_DEX_PREOPT))
diff --git a/core/static_java_library.mk b/core/static_java_library.mk
index c692f9f..e1b9dd0 100644
--- a/core/static_java_library.mk
+++ b/core/static_java_library.mk
@@ -59,7 +59,7 @@
 
 LOCAL_PROGUARD_FLAGS := $(addprefix -include ,$(proguard_options_file)) $(LOCAL_PROGUARD_FLAGS)
 
-ifeq ($(LOCAL_USE_JACK),true)
+ifeq ($(strip $(LOCAL_USE_JACK)),true)
 ifndef LOCAL_JACK_PROGUARD_FLAGS
     LOCAL_JACK_PROGUARD_FLAGS := $(LOCAL_PROGUARD_FLAGS)
 endif
@@ -123,7 +123,7 @@
 	$(hide) find $(PRIVATE_SOURCE_INTERMEDIATES_DIR) -name R.java | xargs cat > $@
 
 $(LOCAL_BUILT_MODULE): $(R_file_stamp)
-ifeq ($(LOCAL_USE_JACK),true)
+ifeq ($(strip $(LOCAL_USE_JACK)),true)
 $(noshrob_classes_jack): $(R_file_stamp)
 $(full_classes_jack): $(R_file_stamp)
 endif # LOCAL_USE_JACK