Hi Tim, "someResource" going out of scope and getting GC-ed was exactly what I thought would be the case, but I made sure that it isn't. I tried making my OcResource.OnGetListener an object that I know for sure is not going out of scope, and the issue is still presenting itself. Even forced my program to wait until onGetCompleted was executed (using a flag and a while loop with a Thread.sleep) but it's still happening.
Any other suggestions please? On Wed, Feb 3, 2016 at 9:37 PM, Kourt, Tim A <tim.a.kourt at intel.com> wrote: > Hi Salvatore, > > The sleep command is there for the log readability purposes only and should > not be used in a real life application. > > The symptoms that you described are likely caused by the resource object > (someResource) going out of scope and GC-ed sometime later. Keeping a global > reference to the resource should help. > > Tim Kourt > Intel Open Source Technology Center > > > -----Original Message----- > From: iotivity-dev-bounces at lists.iotivity.org [mailto:iotivity-dev-bounces > at lists.iotivity.org] On Behalf Of Salvatore Iovene > Sent: Wednesday, February 3, 2016 11:12 AM > To: iotivity-dev at lists.iotivity.org > Subject: [dev] Crash when JNI layer removes OnGetEventListener > > >> On 03 Feb 2016, at 14:06, Salvatore Iovene <salvatore at iovene.com> wrote: >> >> Hi, >> I?m working on a project on top of the Iotivity Java API, and when I try do >> the following, the Iotivity stack crashes: >> >> someResource.get(new HashMap<String, String>(), this); >> >> Here?s the backtrack but it?s probably not very useful. >> >> I/DEBUG ( 2763): pid: 19871, tid: 19928, name: JavaBridge >>> >> com.example.CordovaPluginOicDemo <<< >> I/DEBUG ( 2763): signal 6 (SIGABRT), code -6 (SI_TKILL), fault addr >> -------- >> I/DEBUG ( 2763): eax 00000000 ebx 00004d9f ecx 00004dd8 edx 00000006 >> I/DEBUG ( 2763): esi db11edb8 edi 00000000 >> I/DEBUG ( 2763): xcs 00000023 xds 0000002b xes 0000002b xfs >> 00000117 xss 0000002b >> I/DEBUG ( 2763): eip f772aec6 ebp 00004dd8 esp db11ec00 flags >> 00200206 >> I/DEBUG ( 2763): >> I/DEBUG ( 2763): backtrace: >> I/DEBUG ( 2763): #00 pc 00085ec6 /system/lib/libc.so (tgkill+22) >> I/DEBUG ( 2763): #01 pc 00031223 /system/lib/libc.so >> (pthread_kill+163) >> I/DEBUG ( 2763): #02 pc 00032af5 /system/lib/libc.so (raise+37) >> I/DEBUG ( 2763): #03 pc 0002ac75 /system/lib/libc.so (abort+85) >> I/DEBUG ( 2763): #04 pc 00050934 >> /data/app/com.example.CordovaPluginOicDemo-1/lib/x86/libgnustl_shared.so >> (__gnu_cxx::__verbose_terminate_handler()+452) >> I/DEBUG ( 2763): #05 pc 0004e3f7 >> /data/app/com.example.CordovaPluginOicDemo-1/lib/x86/libgnustl_shared.so >> (__cxxabiv1::__terminate(void (*)())+23) >> I/DEBUG ( 2763): #06 pc 0004e48f >> /data/app/com.example.CordovaPluginOicDemo-1/lib/x86/libgnustl_shared.so >> (std::terminate()+31) >> I/DEBUG ( 2763): #07 pc 000bcdfd >> /data/app/com.example.CordovaPluginOicDemo-1/lib/x86/libgnustl_shared.so >> (execute_native_thread_routine+141) >> I/DEBUG ( 2763): #08 pc 000301f9 /system/lib/libc.so >> (__pthread_start(void*)+57) >> I/DEBUG ( 2763): #09 pc 0002b3da /system/lib/libc.so >> (__start_thread+26) >> I/DEBUG ( 2763): #10 pc 00012c56 /system/lib/libc.so >> (__bionic_clone+70) >> >> >> However, it looks like a threading problem, and I looked at >> /android/examples/simpleclient/?/SimpleClient.java and right before calling >> ?get? on a resource, it does ?sleep(1)?. >> >> Might the two things be related? ?sleep(1)? just doesn?t sound right? can >> anyone explain what?s going on and how to address it properly? > > Hi again, > I?ve done some more experimenting, and I?ve come to the conclusion that the > stack is systematically crashing when the JNI layer removes the OnGetListener. > > This can always be seen in my logs before the crash: > > D/OIC-JNI ( 8643): ~JniOnGetListener > I/OIC-JNI ( 8643): OnEventListener is removed > > Unfortunately there are no more debug logs in that Java file, but given the > fact that the backtrace mentions ?pthread_kill?, maybe this is related to > g_jvm->DetachCurrentThread()? > > I?m using the Iotivity Java stack in a Cordova plugin for Android, if it > helps. > > Please let me know if you can help! > Thanks! > Salvatore > > _______________________________________________ > iotivity-dev mailing list > iotivity-dev at lists.iotivity.org > https://lists.iotivity.org/mailman/listinfo/iotivity-dev -- Salvatore Iovene Personal website: http://iovene.com/ Founder of AstroBin: http://astrobin.com/
