Hi, I have finally had time to look this issue. The problem clearly is that JNI_OnLoad is running on different thread thanJavaVM instance. I Tried quick fix with <br>int status = m_jvm->AttachCurrentThread(&env, NULL) but it does not solve problem because code is running on different thread agan.<br>
<br>It looks that only fix is to add JNIEnv* env to all Bluetooth private classes like class QBluetoothLocalDevicePrivate and then use >AttachCurrentThread to get environment<br>because it is still possible to run bluetooth in different thread than QApplication .<br>
<br><br>Kate<br><br><div class="gmail_quote">On Thu, Nov 8, 2012 at 1:52 PM, Lauri Laanmets <span dir="ltr"><<a href="mailto:lauri.laanmets@proekspert.ee" target="_blank">lauri.laanmets@proekspert.ee</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<div>Hi<br>
<br>
I'm quite sure you are on the right track. I remember I used to do
quite a lot of things in "JNI_OnLoad " because only in that case
it was possible to access the Necessitas Java classes. I remember
an e-mail about redesigning that part, to be able to access
Necessitas Java classes also from other threads. I would suspect
something has changed in this field. I started working on it but
since my "/local/data" is inaccessible, I kind of a "lost a little
motivation".<br>
<br>
Can anybody comment, are Necessitas Java classes now available
also in the other threads?<span><font color="#888888"><br>
<br>
Lauri</font></span><div><div><br>
<br>
<br>
On 8.11.2012 13:39, Kate Alhola wrote:<br>
</div></div></div><div><div>
<blockquote type="cite">Hi, I have been doing little bit research about this
issue. I just under investigation one simple function
QBluetoothLocaldevice::name().<br>
The function crashes if vm->GetEnv() is done in JINI_OnLoad() .
When I moved that code inside of QBluetoothLocaldevice constructor<br>
code works. I have not yet made any patches, this was just result
of simple experiment. <br>
<br>
I tried in some other code do same allocations in JINI_OnLoad and
got errors that VM was allocated for wrong thread.<br>
It looks that JINI_OnLoad is too early phase to allocate<br>
<br>
Before going forward with fix, I just like hear opinion am I at
right track. The bthost is my experimental class<br>
just to test code. initJini is called from constructor. Name()
duplicates function from QBluetoothLocalDevice<br>
<br>
Then other related question, if I do patched libQtConnectivity,
what is best way to use it ? Necessitas always <br>
installs it's own and it can't be copied over without rooting the
device.<br>
<br>
<br>
Kate<br>
<br>
void BtHost::initJini()<br>
{<br>
void* venv = NULL;<br>
<br>
qDebug() << "BtHost:JNI_OnLoad()";<br>
if (m_jvm->GetEnv(&venv, JNI_VERSION_1_4) != JNI_OK)<br>
{<br>
qDebug() << "Qt:GetEnv failed";<br>
return;<br>
}<br>
jclass qtApplicationC;<br>
env = reinterpret_cast<JNIEnv*>(venv);<br>
btAdapterClass =
env->FindClass("android/bluetooth/BluetoothAdapter");<br>
if (btAdapterClass == NULL)<br>
{<br>
qDebug() << "Qt:Native registration unable to find
class android/bluetooth/BluetoothAdapter";<br>
}<br>
<br>
jmethodID getDefaultAdapterID
=env->GetStaticMethodID(btAdapterClass, "getDefaultAdapter",
"()Landroid/bluetooth/BluetoothAdapter;");<br>
if(getDefaultAdapterID == NULL){<br>
qDebug() << "Qt:Native registration unable to get
method ID: getDefaultAdapter of
android/bluetooth/BluetoothAdapter";<br>
}<br>
<br>
btAdapterObject =
env->CallStaticObjectMethod(btAdapterClass,
getDefaultAdapterID);<br>
if(btAdapterObject == NULL){<br>
qDebug() << "Qt:Device does not support Bluetooth";<br>
}<br>
btAdapterObject = env->NewGlobalRef(btAdapterObject);<br>
}<br>
<br>
QString BtHost::name() const<br>
{<br>
qDebug() << " BtHost::name()";<br>
static jmethodID getNameID =
env->GetMethodID(btAdapterClass, "getName",
"()Ljava/lang/String;");<br>
qDebug() << " QBluetoothLocalDevice::name()
env->GetMethodID";<br>
jstring peerName = (jstring)
env->CallObjectMethod(btAdapterObject, getNameID);<br>
qDebug() << " QBluetoothLocalDevice::name()
env->CallObjectMethod";<br>
jboolean isCopy;<br>
const jchar* name = env->GetStringChars(peerName,
&isCopy);<br>
QString qtName = QString::fromUtf16(name,
env->GetStringLength(peerName));<br>
qDebug() << " QBluetoothLocalDevice::name() name="
<< qtName;<br>
env->ReleaseStringChars(peerName, name);<br>
qDebug() <<" QBluetoothLocalDevice::name() exit";<br>
return qtName;<br>
<br>
<br>
}<br>
<br>
<br>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">
On Thu, Nov 1, 2012 at 7:29 PM, Kate Alhola <span dir="ltr"><<a href="mailto:kate.alhola@gmail.com" target="_blank">kate.alhola@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>On Mon, Oct 29, 2012 at 10:59 PM, Micke Prag
<span dir="ltr"><<a href="mailto:micke.prag@telldus.se" target="_blank">micke.prag@telldus.se</a>></span>
wrote:<br>
</div>
<div class="gmail_extra">
<div class="gmail_quote">
<div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<div>Hi,</div>
<div><br>
</div>
<div>It only happens after I call start(). Only
creating the object works fine.</div>
<div>Thank you for looking into this.</div>
</div>
</blockquote>
</div>
<div><br>
I noticed that exactly same thing happens with
QBluetoothSocket and QBluetoothLocalDevice, in both
cases they happen If I try use some member functions.
Creation of object goes OK in both of cases. I posted
report to android-qt list but may be this is better
forum.<br>
<br>
Here is two cases where I got same bug<br>
<br>
Code:<br>
qDebug() << "Turning bluetooth on";<br>
localDevice->powerOn();<br>
<br>
<p style="margin:0px;text-indent:0px"><span style="font-family:'Monospace';font-size:9pt;color:rgb(60,60,60)">D/Qt
( 4746): Turning bluetooth on </span></p>
<p style="margin:0px;text-indent:0px"><span style="font-family:'Monospace';font-size:9pt;color:rgb(190,20,20)">E/dalvikvm(
4746): JNI ERROR (app bug): accessed stale local
reference 0x9f50001d (index 7 in a table of size
4)</span></p>
<p style="margin:0px;text-indent:0px"><span style="font-family:'Monospace';font-size:9pt;color:rgb(190,20,20)">E/dalvikvm(
4746): VM aborting</span></p>
<br>
Or<br>
<br>
from:<br>
wmSocket = new QBluetoothSocket(
<div>
QBluetoothSocket::RfcommSocket);<br>
<br>
qDebug() << "btHost::tryConnect()"
<< wmPulse.address().toString() << ":"
<< PORT;<br>
wmSocket->connectToService(wmPulse.address(),
PORT);<br>
<br>
<p style="margin:0px;text-indent:0px"><span style="font-family:'Monospace';font-size:9pt;color:rgb(60,60,60)">D/Qt
( 6195): btHost::tryConnect()
"83:7C:82:00:39:31" : 5 </span></p>
<p style="margin:0px;text-indent:0px"><span style="font-family:'Monospace';font-size:9pt;color:rgb(190,20,20)">E/dalvikvm(
6195): JNI ERROR (app bug): accessed stale local
reference 0xb3b0001d (index 7 in a table of size
0)</span></p>
<p style="margin:0px;text-indent:0px"><span style="font-family:'Monospace';font-size:9pt;color:rgb(190,20,20)">E/dalvikvm(
6195): VM aborting</span></p>
<span><font color="#888888">
<p style="margin:0px;text-indent:0px">
<br>
<span style="font-family:'Monospace';font-size:9pt;color:rgb(190,20,20)"></span></p>
<p style="margin:0px;text-indent:0px"><span style="font-family:'Monospace';font-size:9pt;color:rgb(190,20,20)">Kate<br>
</span></p>
</font></span></div>
<br>
</div>
<div>
<div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<div><br>
</div>
<div>Regards</div>
<span><font color="#888888">
<div>Micke</div>
</font></span></div>
<div>
<div>
<p style="color:rgb(160,160,168)">On Monday 29
October 2012 at 21:54, Lauri Laanmets wrote:</p>
<blockquote type="cite" style="border-left-style:solid;border-width:1px;margin-left:0px;padding-left:10px">
<span>
<div>
<div>
<div>Hi<br>
<br>
I guess that is addressed to me :).
Crash is definitely a bug,
regardless of Android permissions or
missing Java files. Can you verify
if it crashes on creating the
DiscoveryAgent object or when
starting the discovery?<br>
<br>
I have lost my old devel set-up, It
takes me a few days to get on that
issue.<br>
<br>
Regards<br>
Lauri<br>
<br>
<br>
On 29.10.2012 22:31, Micke Prag
wrote:<br>
</div>
<blockquote type="cite">
<div>
<div> Hello, </div>
<div><br>
</div>
<div>I know that the Bluetooth
support in Necessitas is not
complete but I wanted to try it
out anyway. I am only trying to
discover bluetooth devices but
my application crashes. I don't
know if I am doing something
wrong or if it is not supported
yet?</div>
<div><br>
</div>
<div>The output from logcat can be
found here: <a href="http://pastebin.com/khcj28Xy" target="_blank">http://pastebin.com/khcj28Xy</a></div>
<div>This is what I am doing:</div>
<div>QtMobility::QBluetoothDeviceDiscoveryAgent
agent;</div>
<div>agent.start();</div>
<div><br>
</div>
<div>libs.xml:</div>
<div>
<div><?xml version='1.0'
encoding='utf-8'?></div>
<div> <resources></div>
<div> <array
name="qt_libs"></div>
<div>
<item>QtCore</item></div>
<div>
<item>QtGui</item></div>
<div>
<item>QtNetwork</item></div>
<div>
<item>QtDeclarative</item></div>
<div>
<item>QtXml</item></div>
<div>
<item>QtOpenGL</item></div>
<div>
<item>QtSystemInfo</item></div>
<div>
<item>QtConnectivity</item></div>
<div> </array></div>
<div> <array
name="bundled_libs"/></div>
<div></resources></div>
<div><br>
</div>
<div>I also have this in
AndroidManifest.xml:</div>
<div><uses-permission
android:name="android.permission.BLUETOOTH"
/></div>
<div><br>
</div>
<div>Bluetooth is activated on
the device.</div>
<div><br>
</div>
<div>The device is a Cube
U30GT-H running Android 4.1.1</div>
</div>
<div>
<div><br>
</div>
<div>-- </div>
<div>Micke Prag</div>
</div>
<br>
<fieldset></fieldset>
<br>
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</blockquote>
<br>
</div>
</div>
</span> </blockquote>
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</div>
</div>
</div>
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</blockquote>
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