The `didFinish` makes it look like you may have a race condition on this line:

    6  CFNetwork                      0x00000001851475a4 __49-[__NSCFLocalSessionTask _task_onqueue_didFinish]_block_invoke + 300

Try to emulate slow hardware to reproduce the end user’s state.

In JDK8, how many threads are spawned when i&#39;m using parallelStream? For instance, in the code:

    list.parallelStream().forEach(/** Do Something */);

If this list has 100000 items, how many threads will be spawned?

Also, do each of the threads get the same number of items to work on or is it randomly allotted?

How many threads are spawned in parallelStream in Java 8?

Why does:

    JSON.parse(&#39;&#39;);

produce an error?
 
    Uncaught SyntaxError: Unexpected end of input

Wouldn&#39;t it be more logical if it just returned `null`?

EDIT: This is not a duplicate of the linked question. While the topic of minimal valid json is related to this question it does not get at the &quot;why&quot;.

Why does JSON.parse fail with the empty string?

I&#39;m working on an app that&#39;s in the app store, which uses `FMDB` for interacting with its sqlite database. We&#39;ve received some crash reports with stack traces like this:

    Thread : Crashed: NSOperationQueue 0x170239c20 :: NSOperation 0x17024d7d0 (QOS: LEGACY)
    0  libobjc.A.dylib                0x000000019701c0b4 objc_retain + 20
    1  MyApp                          0x00000001002bdff4 FMDBBlockSQLiteCallBackFunction
    2  MyApp                          0x00000001002bdb1c FMDBBlockSQLiteCallBackFunction
    3  MyApp                          0x00000001002b66b4 FMDBBlockSQLiteCallBackFunction
    4  MyApp                          0x00000001002980fc FMDBBlockSQLiteCallBackFunction
    5  MyApp                          0x000000010029f20c FMDBBlockSQLiteCallBackFunction
    6  CFNetwork                      0x00000001851475a4 __49-[__NSCFLocalSessionTask _task_onqueue_didFinish]_block_invoke + 300
    7  Foundation                     0x00000001866bf1c4 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 16
    8  Foundation                     0x0000000186610604 -[NSBlockOperation main] + 96
    9  Foundation                     0x00000001866001cc -[__NSOperationInternal _start:] + 636
    10 Foundation                     0x00000001866c1f28 __NSOQSchedule_f + 228
    11 libdispatch.dylib              0x0000000197655954 _dispatch_client_callout + 16
    12 libdispatch.dylib              0x00000001976600a4 _dispatch_queue_drain + 1448
    13 libdispatch.dylib              0x0000000197658a5c _dispatch_queue_invoke + 132
    14 libdispatch.dylib              0x0000000197662318 _dispatch_root_queue_drain + 720
    15 libdispatch.dylib              0x0000000197663c4c _dispatch_worker_thread3 + 108
    16 libsystem_pthread.dylib        0x000000019783522c _pthread_wqthread + 816

However, from reading the `FMDB` code it looks like `FMDBBlockSQLiteCallBackFunction` is only called as the callback for `SQLite` functions created using `FMDatabase`&#39;s `makeFunctionNamed:maximumArguments:withBlock:` method, which we&#39;re not using at all.

Any ideas what could be causing crashes like this?

FMDBBlockSQLiteCallBackFunction Crash in app that&#39;s not using makeFunctionNamed

I'm working on an app that's in the app store, which uses <code>FMDB</code> for interacting with its sqlite database. We've received some crash reports with stack traces like this:
<pre><code class="hljs language-objectivec">Thread : Crashed: NSOperationQueue 0x170239c20 :: NSOperation 0x17024d7d0 (QOS: LEGACY)
0 libobjc.A.dylib 0x000000019701c0b4 objc_retain + 20
1 MyApp 0x00000001002bdff4 FMDBBlockSQLiteCallBackFunction
2 MyApp 0x00000001002bdb1c FMDBBlockSQLiteCallBackFunction
3 MyApp 0x00000001002b66b4 FMDBBlockSQLiteCallBackFunction
4 MyApp 0x00000001002980fc FMDBBlockSQLiteCallBackFunction
5 MyApp 0x000000010029f20c FMDBBlockSQLiteCallBackFunction
6 CFNetwork 0x00000001851475a4 __49-[__NSCFLocalSessionTask _task_onqueue_didFinish]_block_invoke + 300
7 Foundation 0x00000001866bf1c4 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 16
8 Foundation 0x0000000186610604 -[NSBlockOperation main] + 96
9 Foundation 0x00000001866001cc -[__NSOperationInternal _start:] + 636
10 Foundation 0x00000001866c1f28 __NSOQSchedule_f + 228
11 libdispatch.dylib 0x0000000197655954 _dispatch_client_callout + 16
12 libdispatch.dylib 0x00000001976600a4 _dispatch_queue_drain + 1448
13 libdispatch.dylib 0x0000000197658a5c _dispatch_queue_invoke + 132
14 libdispatch.dylib 0x0000000197662318 _dispatch_root_queue_drain + 720
15 libdispatch.dylib 0x0000000197663c4c _dispatch_worker_thread3 + 108
16 libsystem_pthread.dylib 0x000000019783522c _pthread_wqthread + 816
</code></pre>
However, from reading the <code>FMDB</code> code it looks like <code>FMDBBlockSQLiteCallBackFunction</code> is only called as the callback for <code>SQLite</code> functions created using <code>FMDatabase</code>'s <code>makeFunctionNamed:maximumArguments:withBlock:</code> method, which we're not using at all.
Any ideas what could be causing crashes like this?

has anyone with the iOS 9 beta 1 had this issue?  

I use standard NSURLConnection to connect to a webservice and as soon as a call is made to the webservice i get the below error.  This is currently working in iOS 8.3

Possible beta bug? any ideas or thoughts would be great ! I know its very early in iOS 9 development

Here is the full error:

&gt;CFNetwork SSLHandshake failed (-9824)
NSURLSession/NSURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9824)

 

      
   

     NSURLRequest * urlRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:@&quot;https://mywebserviceurl&quot;]];
            NSURLResponse * response = nil;
            NSError * error = nil;
            NSData * data = [NSURLConnection sendSynchronousRequest:urlRequest
                                                      returningResponse:&amp;response
                                                                  error:&amp;error];

CFNetwork SSLHandshake failed iOS 9

I have a problem with the embedded bitcode term.  
What is embedded bitcode?  
When to enable, `ENABLE_BITCODE` in new Xcode?  
What happens to the binary when enabled, `ENABLE_BITCODE` in Xcode 7?  

What does ENABLE_BITCODE do in xcode 7?

This is not a duplicate of [Untrusted App Developer][1]. Since iOS9 there is no option to trust an enterprise build. Has anyone found a workaround? 


![enter image description here][2]


  [1]: https://stackoverflow.com/questions/25719713/untrusted-app-developer-message-when-installing-enterprise-ios-application
  [2]: http://i.stack.imgur.com/YKTGq.png

iOS9 Untrusted Enterprise Developer with no option to trust

I&#39;m trying to add views in UIStackView programmatically. 
For now My code is:

    UIView *view1 = [[UIView alloc]init];
    view1.backgroundColor = [UIColor blackColor];
    [view1 setFrame:CGRectMake(0, 0, 100, 100)];

    UIView *view2 =  [[UIView alloc]init];
    view2.backgroundColor = [UIColor greenColor];
    [view2 setFrame:CGRectMake(0, 100, 100, 100)];

    [self.stack1 addArrangedSubview:view1];
    [self.stack1 addArrangedSubview:view2];

When i deploy the app, there is only 1 view and it is with black colour.(view1 get the parameters for view2 too)

Add views in UIStackView programmatically

So, the new beta SDK of iOS released last night has &quot;App Transport Security&quot; which encourages developers to use https instead of http. In principle, this is a great idea, and I already use https in our staging/production environments. However, I don&#39;t have https set up in my local development environment, when the iOS app is connecting to a web service I&#39;m running on my laptop.

From a bit of playing around this morning, it appears that the URL loading system will, even if you hand it an http URL, decide to use https instead. Does anyone know how to disable this behaviour -- even just for particular URLs?

How do I load an HTTP URL with App Transport Security enabled in iOS 9?

We can use the `-cmd` option with `sqlite3` to run a query, but then `sqlite3` opens the database and waits in there for interactive input. How can we run a query on `sqlite3` from the command line and exit?


Run command-line SQLite 3 query and exit

I want to develop desktop app using [electron][1] that uses sqlite3 package installed via npm with the command

    npm install --save sqlite3

but it gives the following error in electron browser console

    Uncaught Error: Cannot find module &#39;E:\allcode\eapp\node_modules\sqlite3\lib\binding\node-v45-win32-x64\node_sqlite3.node&#39;

My development environment is windows 8.1 x64
node version 12.7


my **package.json** file looks like this:

    {
      &quot;name&quot;: &quot;eapp&quot;,
      &quot;version&quot;: &quot;1.0.0&quot;,
      &quot;description&quot;: &quot;&quot;,
      &quot;main&quot;: &quot;index.js&quot;,
      &quot;scripts&quot;: {
        &quot;start&quot;: &quot;electron .&quot;
      },
      &quot;author&quot;: &quot;&quot;,
      &quot;license&quot;: &quot;ISC&quot;,
      &quot;devDependencies&quot;: {
        &quot;electron-prebuilt&quot;: &quot;^0.32.1&quot;
      },
      &quot;dependencies&quot;: {
        &quot;angular&quot;: &quot;^1.3.5&quot;,   
        &quot;sqlite3&quot;: &quot;^3.1.0&quot;
      }
    }

**index.js file**

    var app = require(&#39;app&#39;);
    var BrowserWindow = require(&#39;browser-window&#39;); 
    require(&#39;crash-reporter&#39;).start();
    var mainWindow = null;
    
    
    app.on(&#39;window-all-closed&#39;, function() {  
        if (process.platform != &#39;darwin&#39;) {
            app.quit();
        }
    });
    
    app.on(&#39;ready&#39;, function() {
        // Create the browser window.
        mainWindow = new BrowserWindow({width: 800, height: 600}); 
        mainWindow.loadUrl(&#39;file://&#39; + __dirname + &#39;/index.html&#39;);   
        mainWindow.openDevTools();  
        mainWindow.on(&#39;closed&#39;, function() {       
            mainWindow = null;
        });
    });

**my.js file** 

    var sqlite3 = require(&#39;sqlite3&#39;).verbose();
    var db = new sqlite3.Database(&#39;mydb.db&#39;);
    
    db.serialize(function() {
        db.run(&quot;CREATE TABLE if not exists lorem (info TEXT)&quot;);
    
        var stmt = db.prepare(&quot;INSERT INTO lorem VALUES (?)&quot;);
        for (var i = 0; i &lt; 10; i++) {
            stmt.run(&quot;Ipsum &quot; + i);
        }
        stmt.finalize();
    
        db.each(&quot;SELECT rowid AS id, info FROM lorem&quot;, function(err, row) {
            console.log(row.id + &quot;: &quot; + row.info);
        });
    });
    
    db.close();

**index.html file**

    &lt;!DOCTYPE html&gt;
    &lt;html&gt;
    &lt;head lang=&quot;en&quot;&gt;
        &lt;meta charset=&quot;UTF-8&quot;&gt;
        &lt;title&gt;&lt;/title&gt;
    &lt;/head&gt;
    &lt;body&gt;
    &lt;div &gt;
        &lt;div&gt;
            &lt;h2&gt;Hello&lt;/h2&gt;
        &lt;/div&gt;
    
    &lt;/div&gt;
    &lt;!--&lt;script src=&quot;js/jquery-1.11.3.min.js&quot;&gt;&lt;/script&gt;--&gt;
    &lt;script src=&quot;js/my.js&quot;&gt;&lt;/script&gt;
    &lt;/body&gt;
    &lt;/html&gt;


  [1]: http://electron.atom.io/

How to use sqlite3 module with electron?

I have an SQLite 3 database in SUSE Linux.

It&#39;s stuck at the command prompt like so:

    sqlite&gt; q
       ...&gt; exit
       ...&gt; .exit
       ...&gt; quit
       ...&gt; .quit

How do I exit out of the database?


Exit a SQLite 3 database

I am trying to insert values in table. But there is only one value inserted. I am getting an error in log cat when I am trying to insert new values. 

Log cat shows :

    abort at 13 in [INSERT INTO event(totalminutesfrom,dayofweek,title,location,totalminutesto,id) VALUES (?,?,?,?,?,?)]: UNIQUE constraint failed: event.id
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase: Error inserting totalminutesfrom=694 dayofweek=null title=qxs location=Eded &amp; Mariz totalminutesto=0 id=0
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase: android.database.sqlite.SQLiteConstraintException: UNIQUE constraint failed: event.id (code 1555)
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteConnection.nativeExecuteForLastInsertedRowId(Native Method)
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteConnection.executeForLastInsertedRowId(SQLiteConnection.java:782)
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteSession.executeForLastInsertedRowId(SQLiteSession.java:788)
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteStatement.executeInsert(SQLiteStatement.java:86)
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1471)
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1341)
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at com.example.siddhi.timetablelayout.EventTableHelper.addEvent(EventTableHelper.java:76)
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at com.example.siddhi.timetablelayout.AddEventActivity$5.onClick(AddEventActivity.java:217)


Its showing error on these two lines while inserting row.

    db.insert(TABLE, null, values);

       db.addEvent(new EventData(eventTitle,dayOfWeek,totalMinutesFrom, totalMinutesTo,location));



EventTableHelper


        
    public class EventTableHelper extends SQLiteOpenHelper {
    
    
        private static final String TABLE = &quot;event&quot;;
        private static final String KEY_ID = &quot;id&quot;;
        private static final String KEY_TITLE = &quot;title&quot;;
        private static final String KEY_LOCATION = &quot;location&quot;;
        private static final String KEY_DAY_OF_WEEK = &quot;dayofweek&quot;;
        private static final String KEY_TOTAL_MINUTES_FROM = &quot;totalminutesfrom&quot;;
        private static final String KEY_TOTAL_MINUTES_TO = &quot;totalminutesto&quot;;
    
    
    
        public EventTableHelper(Context context) {
            super(context, Constants.DATABASE_NAME, null, Constants.DATABASE_VERSION);
            //3rd argument to be passed is CursorFactory instance
        }
    
        // Creating Tables
        @Override
        public void onCreate(SQLiteDatabase db) {
            //createTable(db);
        }
    
        public void createTable(SQLiteDatabase db){
            String CREATE_EVENTS_TABLE = &quot;CREATE TABLE &quot; + TABLE + &quot;(&quot;
                    + KEY_ID + &quot; INTEGER PRIMARY KEY,&quot; + KEY_TITLE + &quot; TEXT,&quot;
                    + KEY_DAY_OF_WEEK +&quot;TEXT&quot; + KEY_TOTAL_MINUTES_FROM +&quot;INTEGER&quot;
                    + KEY_TOTAL_MINUTES_TO + &quot;INTEGER&quot; +  KEY_LOCATION + &quot;TEXT&quot; +  &quot;)&quot;;
    
            db.execSQL(CREATE_EVENTS_TABLE);
    
        }
        // Upgrading database
        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            // Drop older table if existed
           // db.execSQL(&quot;DROP TABLE IF EXISTS &quot; + TABLE);
    
          //  createTable(db);
    
            // Create tables again
            //onCreate(db);
        }
    
        // code to add the new contact
        public void addEvent(EventData event) {
            SQLiteDatabase db = this.getWritableDatabase();
    
            ContentValues values = new ContentValues();
            values.put(KEY_ID, event.getId());
            values.put(KEY_TITLE,event.getTitle()); // Contact Name
            values.put(KEY_DAY_OF_WEEK,event.getDayofWeek());
            values.put(KEY_TOTAL_MINUTES_FROM,event.getFromMinutes());
            values.put(KEY_TOTAL_MINUTES_TO,event.getToMinutes());
            values.put(KEY_LOCATION,event.getLocation());
            // Inserting Row
            db.insert(TABLE, null, values);
            //2nd argument is String containing nullColumnHack
            db.close(); // Closing database connection
        }
    
        // code to get the single contact
       EventData getEvent(int id) {
            SQLiteDatabase db = this.getReadableDatabase();
    
            Cursor cursor = db.query(TABLE, new String[] { KEY_ID,
                            KEY_TITLE, KEY_DAY_OF_WEEK, KEY_TOTAL_MINUTES_FROM,KEY_TOTAL_MINUTES_TO,KEY_LOCATION }, KEY_ID + &quot;=?&quot;,
                    new String[] { String.valueOf(id) }, null, null, null, null);
            if (cursor != null)
                cursor.moveToFirst();
           EventData eventData = new EventData(Integer.parseInt(cursor.getString(0)),cursor.getString(1), cursor.getString(2),
                   cursor.getInt(3),cursor.getInt(4),cursor.getString(5));
    
            return eventData;
        }
    
    
    
        // code to get all contacts in a list view
        public List&lt;EventData&gt; getAllEvents() {
            List&lt;EventData&gt; conList = new ArrayList&lt;EventData&gt;();
            // Select All Query
            String selectQuery = &quot;SELECT  * FROM &quot; + TABLE;
    
            SQLiteDatabase db = this.getWritableDatabase();
            Cursor cursor = db.rawQuery(selectQuery, null);
    
            // looping through all rows and adding to list
            if (cursor.moveToFirst()) {
                do {
    
                    EventData event = new EventData();
    
                    event.setId(Integer.parseInt(cursor.getString(0)));
                    event.setTitle(cursor.getString(1));
                    event.setDayofWeek(cursor.getString(2));
                    event.setFromMinutes(cursor.getInt(3));
                    event.setToMinutes(cursor.getInt(4));
                    event.setLocation(cursor.getString(5));
                    // Adding contact to list
                    conList.add(event);
                } while (cursor.moveToNext());
            }
    
            // return contact list
            return conList;
        }
    }

How to solve this??

UNIQUE constraint failed: sqlite database : android

I have two major questions. 

 1. Database won&#39;t delete when uninstall app.
 2. Downloaded files won&#39;t delete while unstable the app.
 
There is a database in my android application. I create it by java

    class as follows.

    public DataBaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    public DataBaseHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version, DatabaseErrorHandler errorHandler) {
        super(context, name, factory, version, errorHandler);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // creating required tables
        db.execSQL(CREATE_TABLE_QUOTES);
        db.execSQL(CREATE_TABLE_FILTERS);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // on upgrade drop older tables
        db.execSQL(&quot;DROP TABLE IF EXISTS &quot; + TABLE_QUOTES);
        db.execSQL(&quot;DROP TABLE IF EXISTS &quot; + TABLE_QUOTES);
        // create new tables
        onCreate(db);
    }

There is no specific path defined  at the code for database.

This is the code how I download files. And there is specific path, But it is not allowed to create folder in Android&gt;data&gt;com.myapp as well. 

    public String downloadImage(String img_url, int i) {
            File sdCard = Environment.getExternalStorageDirectory();
            File dir = new File (sdCard.getAbsolutePath() + &quot;/fog/images/filters&quot;);
            // Make sure the Pictures directory exists.
            dir.mkdirs();
            File destinationFile = new File(dir, &quot;filter&quot;+i);
            String filepath = null;
            try{
                URL url = new URL(&quot;http://fog.wrapper.io/uploads/category/&quot;+img_url+&quot;.png&quot;);

                HttpURLConnection conection = (HttpURLConnection)url.openConnection();
                conection.setRequestMethod(&quot;GET&quot;);
                conection.setRequestProperty(&quot;Content-length&quot;, &quot;0&quot;);
                conection.setUseCaches(false);
                conection.setAllowUserInteraction(false);
                conection.connect();

                int status = conection.getResponseCode();

                switch (status) {
                    case 200:
                    case 201:
                        FileOutputStream fileOutput = new FileOutputStream(destinationFile);
                        InputStream inputStream = conection.getInputStream();
                        int totalSize = conection.getContentLength();
                        int downloadedSize = 0;
                        byte[] buffer = new byte[1024];
                        int bufferLength = 0;
                        while ( (bufferLength = inputStream.read(buffer)) &gt; 0 )
                        {
                            fileOutput.write(buffer, 0, bufferLength);
                            downloadedSize += bufferLength;                            Log.i(&quot;Progress:&quot;,&quot;downloadedSize:&quot;+downloadedSize+&quot;totalSize:&quot;+ totalSize) ;
                        }
                        fileOutput.close();
                        if(downloadedSize==totalSize) filepath = destinationFile.getPath();
                       Log.i(&quot;filepath:&quot;,&quot; &quot;+filepath) ;
                        return filepath;
                }

            } catch (IOException e) {
                Log.d(&quot;ImageManager&quot;, &quot;Error: &quot; + e);
            }
            return null;
        }
    } // Get filters

Please help me. Sorry for bad English.

Content Type	Original Author	Original Content on Stackoverflow
Question	Greg	View Question on Stackoverflow
Solution 1 - Ios	Kirk Strobeck	View Answer on Stackoverflow

FMDBBlockSQLiteCallBackFunction Crash in app that's not using makeFunctionNamed

Ios Problem Overview

Ios Solutions

Solution 1 - Ios

Why does JSON.parse fail with the empty string?

How many threads are spawned in parallelStream in Java 8?

Attributions