I have asked the writer of the article in mention - and he as
generously answered it on stack overflow. So I will direct any one who
needs an answer for the issue there:
http://stackoverflow.com/questions/8911776/androids-checkjni-how-to-turn-it-off-on-on-an-emulator-documentation-seems
On Jan 19, 12:05 pm, Jon Bonbon Jovi
wrote:
> I have spent some time examining the checkjni mode using an Android
> emulator with my app.
> Altough it is written
> (inhttp://android-developers.blogspot.com/2011/11/jni-local-reference-ch...)
> that CheckJNI is on by default if debuggable="true" & targetSdkVersion
> is at least Ice Cream Sandwich (in the AndroidManifest.xml file) - The
> debug output dump of the CheckJNI (warning and errors) is still
> printed in the DDMS, even if i use a Gingerbread values and install it
> on a Gingerbread emulator.
>
> The only difference that i have found is that CheckJNI warnings on an
> Ice Cream Sandwich emulator (no matter what were the values in my
> AndroidManifest.xml file) will cause the app to crash with the
> respected warning - while they would only be printed in a Gingerbread
> emulator (I have tested a DeleteGlobalRef used on local reference to
> induce this warning).
>
> There are two non-informational logs that are printed in accordance to
> the AndroidManifest.xml - But the logs of the of the CheckJNI mode are
> not affected.
>
> Here are the logs -
>
> #On ICS emulator
> After Installing the app:
> 01-19 08:43:01.491: D/AndroidRuntime(32): CheckJNI is ON
>
> Loading the app:
> 01-19 08:32:26.617: D/dalvikvm(590): Not late-enabling CheckJNI
> (already on)
> (The last line is printed only when debuggable="true")
> 01-19 08:32:27.066: I/dalvikvm(590): Turning on JNI app bug
> workarounds for target SDK version 10...
> (The last line is printed only when targetSdkVersion=10)
>
> On error code (crash):
> 01-19 08:37:56.176: W/dalvikvm(651): JNI WARNING: DeleteGlobalRef on
> non-global 0x41339550 (type=1)
> ...
> 01-19 08:37:56.187: E/dalvikvm(651): VM aborting
> 01-19 08:37:56.187: A/libc(651): Fatal signal 11 (SIGSEGV) at
> 0xdeadd00d (code=1)
>
> #On Gingerbread:
>
> After Installing the app:
> 01-19 08:43:01.491: D/AndroidRuntime(32): CheckJNI is ON
>
> Loading the app:
> No important logs
>
> On error code (no crash):
> 01-19 08:45:20.079: W/dalvikvm(304): JNI: DeleteGlobalRef(0x40608718)
> failed to find entry (valid=1)
>
> So my question is how should i turn it on/off - and how should it
> affect the application (or the logs) differently when on?
>
> Thanks.
>
>
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