问题
Exception Information
cannot open file at line 30176 of [00bb9c9ce4]
(14) os_unix.c:30176: (24) open(/data/data/c/databases/pos-db-journal) -
(14) cannot open file at line 30176 of [00bb9c9ce4]
(14) os_unix.c:30176: (24) open(/data/data/c/pos-db-journal) -
(14) statement aborts at 14: [SELECT T."_id",T."PRINTDATA",T."POSITION",T."DOUBLEFORMAT",
T."PRINTERMODE",T."INSERTTIME" FROM "PRINT_DATA_ITEM" T] unable to open database file
E/SQLiteQuery: exception: unable to open database file (code 14); query: SELECT T."_id",T.
"PRINTDATA",T."POSITION",T."DOUBLEFORMAT",T."PRINTERMODE",T."INSERTTIME" FROM "PRINT_DATA_ITEM" T
part code：
private PrinterTask(Context context) {
this.mContext = context;
helper = new DaoMaster.DevOpenHelper(context, "pos-db", null);
db = helper.getWritableDatabase();
mDaoMaster = new DaoMaster(db);
mDaoSession = mDaoMaster.newSession();
mPrintDataItemDao = mDaoSession.getPrintDataItemDao();
mRequestDataItemDao = mDaoSession.getRequestDataItemDao();
}
//
public void startPrintThread() {
dataIsExist = true;
//
if (!threadIsRuning) {
thread = new Thread() {
@Override
public void run() {
super.run();
threadIsRuning = true;
List<PrintDataItem> list;
while (dataIsExist) {
list = mPrintDataItemDao.loadAll();
if (list != null && list.size() > 0) {
KLog.d("startPrintThread", String.valueOf(++count) + " " + String.valueOf(list.size()));
}
threadIsRuning = false;
}
};
thread.start();
}
when the count is added to about 600000 ,app will exist without any omen. then logcat output these info.
log output：
（1）Could not create epoll instance. errno=24
（2）CursorWindow(26673): Could not allocate CursorWindow of size 2097152 due to error -24
（3）F/Looper (26673): Could not create wake pipe. errno=24
I/qtaguid (20825): Failed write_ctrl(s 0 10051) res=-1 errno=1
FATAL EXCEPTION: Thread-118`enter code here`
what i can do so solve this problem? I will appreciate it!
回答1:
These code is Ok. I find other code load these Exception. I use intentservice and AlarmManager to make a cyclic service. I give up the AlarmManager. Then change code like this: It works. Exception no longer appear.
new Thread(new Runnable() {
@Override
public void run() {
mRequestDataItem = DBHelper.getInstance(getApplicationContext()).getTopFailedNetRequestInDataBase();
while (isRunning) {
CommonUtilLog.d("reRequestTask Loop", String.valueOf(countLoop++));
if (!isPosting) {
if (reRequestTask == null) {
if (mRequestDataItem != null) {
CommonUtilLog.d("reRequestTask", String.valueOf(count++));
reRequestTask = new ReRequestTask(mRequestDataItem);
}
}
}
try {
Thread.sleep(CommonConstant.THREAD_SLEEP_RETRY_REQUEST_SERVICE);
} catch (InterruptedException e) {
e.printStackTrace();
}
mRequestDataItem = DBHelper.getInstance(getApplicationContext()).getTopFailedNetRequestInDataBase();
}
}
}).start();
the way to find the problem: 来自这篇博客的博主：http://ju.outofmemory.cn/entry/247095 “差异法”，逐步注释代码，找出出错的真凶.
回答2:
"Could not allocate CursorWindow of size 2097152 due to error ...."
occurs when a cursor is not closed and is called in loop.
Cursor error is not shown to avoid data leak logging.
To know error in my code, I added these lines.
when activity opens, and it exactly pointed to the line that was causing the error.
if (BuildConfig.DEBUG) {
StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
.detectLeakedSqlLiteObjects()
.detectLeakedClosableObjects()
.penaltyLog()
.penaltyDeath()
.build());
}
来源：https://stackoverflow.com/questions/36300821/could-not-allocate-cursorwindow-pos-db-of-size-2097152-due-to-error-24