Android_JNI_FileRead crashes on android4

SDL Development
1

Hi,

I opened file with SDL_RWFromFile from APK and tried to get it size with:

SDL_RWseek(fh, 0, RW_SEEK_END);

It’s working everywhere except android 4

03-23 12:19:54.464: E/dalvikvm(563): JNI ERROR (app bug): accessed stale
local reference 0x1d200029 (index 10 in a table of size 3)

03-23 12:19:54.464: W/dalvikvm(563): JNI WARNING: 0x1d200029 is not a valid
JNI reference

03-23 12:19:54.464: W/dalvikvm(563): in
Lorg/libsdl/app/SDLActivity;.nativeInit:()V (CallIntMethodV)

I added some traces and found out that app crashes in Android_JNI_FileRead
at this line:

int result = mEnv->CallIntMethod(readableByteChannel, readMethod,
byteBuffer);

I don’t understand all this JNI magic code, but found this article:

<http://android-developers.blogspot.com/2011/11/jni-local-reference-changes-
in-ics.html>
http://android-developers.blogspot.com/2011/11/jni-local-reference-changes-i
n-ics.html

Who may fix this bug?

2

2012/3/25 Dennis Muratshin

Hi,****

I opened file with SDL_RWFromFile from APK and tried to get it size with:*

SDL_RWseek(fh, 0, RW_SEEK_END); ****

It?s working everywhere except android 4****

03-23 12:19:54.464: E/dalvikvm(563): JNI ERROR (app bug): accessed stale
local reference 0x1d200029 (index 10 in a table of size 3)****

03-23 12:19:54.464: W/dalvikvm(563): JNI WARNING: 0x1d200029 is not a
valid JNI reference****

03-23 12:19:54.464: W/dalvikvm(563): in
Lorg/libsdl/app/SDLActivity;.nativeInit:()V (CallIntMethodV)****

I added some traces and found out that app crashes in Android_JNI_FileRead
at this line:****

int result = mEnv->CallIntMethod(readableByteChannel, readMethod,
byteBuffer);****

I don?t understand all this JNI magic code, but found this article:****

http://android-developers.blogspot.com/2011/11/jni-local-reference-changes-in-ics.html

Who may fix this bug?****

I believe the minimum supported API level is android-5, and I’m fairly
certain there was at least a feature that required android-7 and up, though
I can’t recall what was it.–
Gabriel.

3

I meant latest Android 4.0.3 ice cream sandwich

(Android 15 api)From: sdl-bounces@lists.libsdl.org [mailto:sdl-bounces at lists.libsdl.org] On
Behalf Of Gabriel Jacobo
Sent: Monday, March 26, 2012 7:57 PM
To: SDL Development List
Subject: Re: [SDL] Android_JNI_FileRead crashes on android4

2012/3/25 Dennis Muratshin <@Dennis_Muratshin>

Hi,

I opened file with SDL_RWFromFile from APK and tried to get it size with:

SDL_RWseek(fh, 0, RW_SEEK_END);

It’s working everywhere except android 4

03-23 12:19:54.464: E/dalvikvm(563): JNI ERROR (app bug): accessed stale
local reference 0x1d200029 (index 10 in a table of size 3)

03-23 12:19:54.464: W/dalvikvm(563): JNI WARNING: 0x1d200029 is not a valid
JNI reference

03-23 12:19:54.464: W/dalvikvm(563): in
Lorg/libsdl/app/SDLActivity;.nativeInit:()V (CallIntMethodV)

I added some traces and found out that app crashes in Android_JNI_FileRead
at this line:

int result = mEnv->CallIntMethod(readableByteChannel, readMethod,
byteBuffer);

I don’t understand all this JNI magic code, but found this article:

<http://android-developers.blogspot.com/2011/11/jni-local-reference-changes-
in-ics.html>
http://android-developers.blogspot.com/2011/11/jni-local-reference-changes-i
n-ics.html

Who may fix this bug?

I believe the minimum supported API level is android-5, and I’m fairly
certain there was at least a feature that required android-7 and up, though
I can’t recall what was it.

–
Gabriel.

4

Anyone answer?

Also I see that this api is not thread safe on AndroidFrom: Dennis Muratshin [mailto:@Dennis_Muratshin]
Sent: Monday, March 26, 2012 9:26 PM
To: 'SDL Development List’
Subject: RE: [SDL] Android_JNI_FileRead crashes on android4

I meant latest Android 4.0.3 ice cream sandwich

(Android 15 api)

From: sdl-bounces@lists.libsdl.org [mailto:sdl-bounces at lists.libsdl.org] On
Behalf Of Gabriel Jacobo
Sent: Monday, March 26, 2012 7:57 PM
To: SDL Development List
Subject: Re: [SDL] Android_JNI_FileRead crashes on android4

2012/3/25 Dennis Muratshin <@Dennis_Muratshin>

Hi,

I opened file with SDL_RWFromFile from APK and tried to get it size with:

SDL_RWseek(fh, 0, RW_SEEK_END);

It’s working everywhere except android 4

03-23 12:19:54.464: E/dalvikvm(563): JNI ERROR (app bug): accessed stale
local reference 0x1d200029 (index 10 in a table of size 3)

03-23 12:19:54.464: W/dalvikvm(563): JNI WARNING: 0x1d200029 is not a valid
JNI reference

03-23 12:19:54.464: W/dalvikvm(563): in
Lorg/libsdl/app/SDLActivity;.nativeInit:()V (CallIntMethodV)

I added some traces and found out that app crashes in Android_JNI_FileRead
at this line:

int result = mEnv->CallIntMethod(readableByteChannel, readMethod,
byteBuffer);

I don’t understand all this JNI magic code, but found this article:

<http://android-developers.blogspot.com/2011/11/jni-local-reference-changes-
in-ics.html>
http://android-developers.blogspot.com/2011/11/jni-local-reference-changes-i
n-ics.html

Who may fix this bug?

I believe the minimum supported API level is android-5, and I’m fairly
certain there was at least a feature that required android-7 and up, though
I can’t recall what was it.

–
Gabriel.