Disconnect SensorTag will cause Java Runtime Enviroment fatal error. #66
Description
Hello. It's me again.
I Upgared my Edison's tinyB library to newest version of
https://github.com/intel-iot-devkit/tinyb/tree/6e580f494ced312ed8f56bcd3fc33499d91720e3
And Use Java Sample Notification code with a tiny little modification to test sensor.
Here is my java code
import tinyb.*;
import java.util.*;
import java.time.*;
import java.util.concurrent.locks.*;
class ValueNotification implements BluetoothNotification<byte[]> {
public void run(byte[] tempRaw) {
System.out.print("Temp raw = {");
for (byte b : tempRaw) {
System.out.print(String.format("%02x,", b));
}
System.out.print("}");
int objectTempRaw = (tempRaw[0] & 0xff) | (tempRaw[1] << 8);
int ambientTempRaw = (tempRaw[2] & 0xff) | (tempRaw[3] << 8);
float objectTempCelsius = Notification.convertCelsius(objectTempRaw);
float ambientTempCelsius = Notification.convertCelsius(ambientTempRaw);
System.out.println(
String.format(" Temp: Object = %fC, Ambient = %fC", objectTempCelsius, ambientTempCelsius));
}
}
class ConnectedNotification implements BluetoothNotification<Boolean> {
public void run(Boolean connected) {
System.out.println("Connected");
}
}
public class Notification {
private static final float SCALE_LSB = 0.03125f;
static boolean running = true;
static void printDevice(BluetoothDevice device) {
System.out.print("Address = " + device.getAddress());
System.out.print(" Name = " + device.getName());
System.out.print(" Connected = " + device.getConnected());
System.out.println();
}
static float convertCelsius(int raw) {
return raw / 128f;
}
public static void main(String[] args) throws InterruptedException {
if (args.length < 1) {
System.err.println("Run with <device_address> argument");
System.exit(-1);
}
BluetoothManager manager = BluetoothManager.getBluetoothManager();
boolean discoveryStarted = manager.startDiscovery();
System.out.println("The discovery started: " + (discoveryStarted ? "true" : "false"));
BluetoothDevice sensor = manager.find(null, args[0], null, Duration.ofSeconds(10));
if (sensor == null) {
System.err.println("No sensor found with the provided address.");
System.exit(-1);
}
sensor.enableConnectedNotifications(new ConnectedNotification());
System.out.print("Found device: ");
printDevice(sensor);
if (sensor.connect())
System.out.println("Sensor with the provided address connected");
else {
System.out.println("Could not connect device.");
System.exit(-1);
}
//manager.stopDiscovery();
Lock lock = new ReentrantLock();
Condition cv = lock.newCondition();
Runtime.getRuntime().addShutdownHook(new Thread() {
public void run() {
running = false;
lock.lock();
try {
cv.signalAll();
} finally {
lock.unlock();
}
}
});
BluetoothGattService tempService = sensor.find( "f000aa00-0451-4000-b000-000000000000");
if (tempService == null) {
System.err.println("This device does not have the temperature service we are looking for.");
sensor.disconnect();
System.exit(-1);
}
System.out.println("Found service " + tempService.getUUID());
BluetoothGattCharacteristic tempValue = tempService.find("f000aa01-0451-4000-b000-000000000000");
BluetoothGattCharacteristic tempConfig = tempService.find("f000aa02-0451-4000-b000-000000000000");
BluetoothGattCharacteristic tempPeriod = tempService.find("f000aa03-0451-4000-b000-000000000000");
if (tempValue == null || tempConfig == null || tempPeriod == null) {
System.err.println("Could not find the correct characteristics.");
sensor.disconnect();
System.exit(-1);
}
System.out.println("Found the temperature characteristics");
byte[] config = { 0x01 };
tempConfig.writeValue(config);
byte[] period = { 100 };
tempPeriod.writeValue(period);
tempValue.enableValueNotifications(new ValueNotification());
//// ////////////////////////I added stop code here////////////////////////
while(running){
if(!sensor.getConnected())
running = false;
}
//// ////////////////////////I added stop code here////////////////////////
lock.lock();
try {
while(running)
cv.await();
} finally {
lock.unlock();
}
sensor.disconnect();
}
}
And when sensor poweroff or out of bluetooth signal range program will end with some Error message
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0xb7163983, pid=1551, tid=0xb6cf5b40
#
# JRE version: Java(TM) SE Runtime Environment (8.0_101-b13) (build 1.8.0_101-b13)
# Java VM: Java HotSpot(TM) Client VM (25.101-b13 mixed mode linux-x86 )
# Problematic frame:
# V [libjvm.so+0x46d983] Monitor::ILock(Thread*)+0xa3
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /home/root/hs_err_pid1551.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#
Aborted
And log file recorded 2 erros.
Internal exceptions (2 events):
Event: 0.194 Thread 0xb6b09400 Exception <a 'java/lang/NoSuchMethodError': Method sun.misc.Unsafe.defineClass(Ljava/lang/String;[BII)Ljava/lang/Class; name or signature does not match> (0xa5806ea0) thrown at [/HUDSON/workspace/8-2-build-linux-i586/jdk8u101/7261/hotspot/src/share/vm/pri
Event: 0.194 Thread 0xb6b09400 Exception <a 'java/lang/NoSuchMethodError': Method sun.misc.Unsafe.prefetchRead(Ljava/lang/Object;J)V name or signature does not match> (0xa5807170) thrown at [/HUDSON/workspace/8-2-build-linux-i586/jdk8u101/7261/hotspot/src/share/vm/prims/jni.cpp, line 4
I'm using Oracle Jdk 1.8.0_101 and 5.43 Version of Bluez on Edison.
So. what should I do ? or how can I terminate my program without fatal error ??
Thank you.