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Android NDK Shared Libraries

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This morning, I got stumped by the Java/NDK integration. I was trying to add another shared library (Lua) to a project, and kept getting these dynamic linker error messages:

I/ActivityManager( 1386): Start proc org.libsdl.app for activity org.libsdl.app/.SDLActivity: pid=25826 uid=10087 gids={1015}
W/dalvikvm(25826): Exception Ljava/lang/UnsatisfiedLinkError; thrown during Lorg/libsdl/app/SDLActivity;.<clinit>
W/dalvikvm(25826): Class init failed in newInstance call (Lorg/libsdl/app/SDLActivity;)
W/dalvikvm(25826): threadid=1: thread exiting with uncaught exception (group=0x40020ac0)
E/AndroidRuntime(25826): FATAL EXCEPTION: main
E/AndroidRuntime(25826): java.lang.ExceptionInInitializerError
E/AndroidRuntime(25826):        at java.lang.Class.newInstanceImpl(Native Method)
E/AndroidRuntime(25826):        at java.lang.Class.newInstance(Class.java:1429)
E/AndroidRuntime(25826):        at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
E/AndroidRuntime(25826):        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
E/AndroidRuntime(25826):        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
E/AndroidRuntime(25826):        at android.app.ActivityThread.access$2300(ActivityThread.java:125)
E/AndroidRuntime(25826):        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
E/AndroidRuntime(25826):        at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(25826):        at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime(25826):        at android.app.ActivityThread.main(ActivityThread.java:4627)
E/AndroidRuntime(25826):        at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(25826):        at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime(25826):        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
E/AndroidRuntime(25826):        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
E/AndroidRuntime(25826):        at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(25826): Caused by: java.lang.UnsatisfiedLinkError: Library main not found
E/AndroidRuntime(25826):        at java.lang.Runtime.loadLibrary(Runtime.java:461)
E/AndroidRuntime(25826):        at java.lang.System.loadLibrary(System.java:557)
E/AndroidRuntime(25826):        at org.libsdl.app.SDLActivity.<clinit>(SDLActivity.java:53)
E/AndroidRuntime(25826):        ... 15 more
W/ActivityManager( 1386):   Force finishing activity org.libsdl.app/.SDLActivity

What it was was that my Activity (which is a small java stub) needed to call System.loadLibrary(“Lua”); to load that new library. How is that related to the error message? I have no idea.

Sigh. Sometimes missing a single line will cost you half a day.

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