Android memory leak with java code

[maddthad]

Good day I have java code thats called with a string that returns a string. I based everything on the androidToastJava example I found online. I include here what I believe to be the relevent parts.

The c++:
QString get_CA( QString channel_name)
{
QAndroidJniObject tstMsg = QAndroidJniObject::fromString(channel_name);

QAndroidJniObject RcvMsg = QAndroidJniObject::callStaticObjectMethod
("com/amin/QtAndroidToastJava/QtAndroidToastJava"
, "get_CA"
, "(Ljava/lang/String;)Ljava/lang/String;"
, tstMsg.object<jstring>());
return RcvMsg.toString();
}

In MainWindow::timerEvent( QTimerEvent *event ){
...
// call the java code that gets altitude data
altitude_pv = get_CA("altitude");
altitude = altitude_pv.toFloat();
qDebug() << "altitude = " << get_CA( "altitude");
}

The java, gets a data from an EPICS ioc via channel access:
public static String get_CA(String pv) {
// execute
System.setProperty("CA_DISABLE_REPEATER", "false");
System.setProperty("jca.use_env", "false");
System.setProperty("com.cosylab.epics.caj.CAJContext.addr_list", "192.168.36.10");
//String value = new QtAndroidToastJava().execute(pv);
String value = thisInstance.execute(pv);
return ( value );
}

Application output I see memory usage constantly going up but it is reading data
D libqfi_example.so: altitude = "61017.47"
I art : Background sticky concurrent mark sweep GC freed 18976(962KB) AllocSpace objects, 8(160KB) LOS objects, 11% free, 37MB/42MB, paused 16.653ms total 97.180ms
D libqfi_example.so: altitude = "61017.47"
D libqfi_example.so: altitude = "61017.47"
I art : Background partial concurrent mark sweep GC freed 9173(472KB) AllocSpace objects, 6(120KB) LOS objects, 29% free, 38MB/54MB, paused 13.333ms total 88.519ms
D libqfi_example.so: altitude = "61017.47"
D libqfi_example.so: altitude = "61017.47"

finally:
I art : Background partial concurrent mark sweep GC freed 23039(1164KB) AllocSpace objects, 8(160KB) LOS objects, 19% free, 64MB/80MB, paused 17.837ms total 163.092ms
D libqfi_example.so: altitude = "61017.47"
D libqfi_example.so: altitude = "61017.47"
W art : Large object allocation failed: ashmem_create_region failed for 'large object space allocation': Too many open files
I art : Starting a blocking GC Alloc
I art : Starting a blocking GC Alloc
I art : Alloc sticky concurrent mark sweep GC freed 63819(3MB) AllocSpace objects, 19(380KB) LOS objects, 15% free, 68MB/80MB, paused 22.973ms total 154.361ms
W art : Large object allocation failed: ashmem_create_region failed for 'large object space allocation': Too many open files
W art : Throwing OutOfMemoryError "Failed to allocate a 65563 byte allocation with 16777216 free bytes and 187MB until OOM"
I art : WaitForGcToComplete blocked for 384.454ms for cause HeapTrim
E art : ashmem_create_region failed for 'indirect ref table': Too many open files
W art : Throwing OutOfMemoryError "Could not allocate JNI Env"
System.err: java.lang.OutOfMemoryError: Could not allocate JNI Env

Im not sure whats causing this other then the multiple calls to java to get the data.
What can I do to free up the memory?

thx
0

[maddthad]

The java code had a memory leak in the code:
public String execute(String channelName) {
// String [] value = new String[50];
double [] pv_data = new double[50];
try {
// initialize context
//initialize();
Context context = null;
JCALibrary jca = JCALibrary.getInstance();
context = jca.createContext(JCALibrary.CHANNEL_ACCESS_JAVA);
// Create the Channel to connect to the PV.
Channel channel = context.createChannel(channelName);
....
....
....
// calling this before returning solved issue
context.destroy();