Calling a class in a .jar library from a system level service

[Drunczyk]

Hello,

I have a service added into the framework with the other standard services (services.jar). I want the service to be able to call some methods in a .jar library (extender.jar). When the platform builds, everything is fine, references to the library get resolved correctly, the library gets into /system/framework, but when the service tries to call a method in the library, it gets Error: 0xffffffe0 "Broken pipe" and logcat shows:

E/AndroidRuntime( 1104): *** FATAL EXCEPTION IN SYSTEM PROCESS: Binder_B

E/AndroidRuntime( 1104): java.lang.NoClassDefFoundError: Failed resolution of: Lcom/android/server/extender/TestExtender;

E/AndroidRuntime( 1104):  at com.android.server.newservice.NewService.onTransact(NewService.java:79)

E/AndroidRuntime( 1104):  at android.os.Binder.execTransact(Binder.java:446)

E/AndroidRuntime( 1104): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.android.server.extender.TestExtender" on path: DexPathList[[zip file "/system/framework/services.jar", zip file "/system/framework/ethernet-service.jar", zip file "/system/framework/wifi-service.jar"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]

E/AndroidRuntime( 1104):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)

E/AndroidRuntime( 1104):  at java.lang.ClassLoader.loadClass(ClassLoader.java:511)

E/AndroidRuntime( 1104):  at java.lang.ClassLoader.loadClass(ClassLoader.java:469)

E/AndroidRuntime( 1104):  ... 2 more

E/AndroidRuntime( 1104):  Suppressed: java.lang.ClassNotFoundException: Didn't find class "com.android.server.extender.TestExtender" on path: DexPathList[[directory "."],nativeLibraryDirectories=[/vendor/lib, /system/lib]]

E/AndroidRuntime( 1104):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)

E/AndroidRuntime( 1104):  at java.lang.ClassLoader.loadClass(ClassLoader.java:511)

E/AndroidRuntime( 1104):  at java.lang.ClassLoader.loadClass(ClassLoader.java:504)

E/AndroidRuntime( 1104):  ... 3 more

E/AndroidRuntime( 1104):  Suppressed: java.lang.ClassNotFoundException: com.android.server.extender.TestExtender

E/AndroidRuntime( 1104):  at java.lang.Class.classForName(Native Method)

E/AndroidRuntime( 1104):  at java.lang.BootClassLoader.findClass(ClassLoader.java:781)

E/AndroidRuntime( 1104):  at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)

E/AndroidRuntime( 1104):  at java.lang.ClassLoader.loadClass(ClassLoader.java:504)

E/AndroidRuntime( 1104):  ... 4 more

E/AndroidRuntime( 1104):  Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

Is there a way to fix it?

Thanks

[Christopher McClellan]

 Can you share the Android.mk (or Android.bp) for extender.jar and service.jar?

[Drunczyk]

I fixed that error by adding the extender.jar library to PRODUCT_SYSTEM_SERVER_JARS in the product .mk file.

Now I'm trying to understand the build problem: services.jar references my prebuilt static java library newservice, newservice uses prebuilt extender.jar. If I do a full product build, newservice gets compiled into services.jar, but extender.jar isn't installed into /system/frameworks and thus isn't found in the final FW image. Adding LOCAL_REQUIRED_MODULES doesn't seem to help.

I suspect the problem here is the the build doesn't think extender.jar is part of the built product.

Android.mk:

======================================================================

$ LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := newservice

LOCAL_MODULE_TAGS := eng optional

LOCAL_SRC_FILES := javalib.jar

LOCAL_REQUIRED_MODULES := extender

LOCAL_MODULE_CLASS := JAVA_LIBRARIES

LOCAL_MODULE_SUFFIX := $(COMMON_JAVA_PACKAGE_SUFFIX)

include $(BUILD_PREBUILT)

include $(CLEAR_VARS)

LOCAL_MODULE := extender

LOCAL_MODULE_TAGS := eng optional

LOCAL_SRC_FILES := extender.jar

LOCAL_MODULE_CLASS := JAVA_LIBRARIES

LOCAL_MODULE_SUFFIX := $(COMMON_JAVA_PACKAGE_SUFFIX)

include $(BUILD_PREBUILT)

======================================================================

Drunczyk 

[Igor Kalkov]

Did you solve this issue? I am having a similar one.

[Renjith Rajagopal]

Have you tried making it as PlatformLibrary ?

https://android.googlesource.com/platform/vendor/sample/+/acd7c6b02a14e8694d0dced56ea37e79707fba1e/frameworks/PlatformLibrary/README.txt