You should be able to create a file, but you can&#39;t create a directory.  You may need to check the directory `C:\Users\Administrator\Desktop\work` exists first.

You can do

    Path parentDir = project.getFilePath().getParent();
    if (!Files.exists(parentDir))
        Files.createDirectories(parentDir);

The file will be written if default OpenOptions parameter is used. If you specify CREATE, default parameters will not be used, but it is used just CREATE. Try to add WRITE in addition to CREATE, or just leave that parameter empty


I have an ad in my header and a fixed ad at the bottom of my page that is always there. I want the fixed ad to appear only if the user has scrolled under the header ad. I looked into the JQuery documentation, but I&#39;m not really sure what I should use.

JQuery window scrolling event?

I need to convert some xls files into xlsx files. I can successfully convert one xls file into xlsx by running this command into cmd prompt (windows):

    ssconvert inputFileName.xls outputFileName.xlsx

(ssconvert is a Gnumeric&#39;s command-line utility that can convert between different spreadsheet file formats)

I&#39;d like to write a batch file that FOR EACH file in a specified directory runs the command I wrote above, using the current file name both for input and for output filename.

For example, if I have this set of files:

    c:\directory\file1.xls
    c:\directory\file2.xls
    c:\directory\file3.xls


the output should be

    c:\directory\file1.xlsx
    c:\directory\file2.xlsx
    c:\directory\file3.xlsx

so the batch pseudo code should be something like

    directory = c:\directory\
    for (fileName in directory)
        ssconvert fileName.xls fileName.xlsx

Can anyone help me?

batch script - run command on each file in directory

I&#39;m trying to write some text to a file using `Files.write()` method.  
  
	byte[] contents = project.getCode().getBytes(StandardCharsets.UTF_8);
		
	try {
		Files.write(project.getFilePath(), contents, StandardOpenOption.CREATE);
	} catch (IOException ex) {
		ex.printStackTrace();
		return;
	}

According to the API, if the file doesn&#39;t exist, it will be created and then written to.  
  
However, I get this:  

    java.nio.file.NoSuchFileException: C:\Users\Administrator\Desktop\work\Default.txt
    	at sun.nio.fs.WindowsException.translateToIOException(Unknown Source)
    	at sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
    	at sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
    	at sun.nio.fs.WindowsFileSystemProvider.newByteChannel(Unknown Source)
    	at java.nio.file.spi.FileSystemProvider.newOutputStream(Unknown Source)
    	at java.nio.file.Files.newOutputStream(Unknown Source)
    	at java.nio.file.Files.write(Unknown Source)
  
Am I missing something?

Java Files.write NoSuchFileException

I'm trying to write some text to a file using <code>Files.write()</code> method.
<pre><code class="hljs language-ini">byte[] contents = project.getCode().getBytes(StandardCharsets.UTF_8);
	
try {
	Files.write(project.getFilePath(), contents, StandardOpenOption.CREATE);
} catch (IOException ex) {
	ex.printStackTrace();
	return;
}
</code></pre>
According to the API, if the file doesn't exist, it will be created and then written to.
However, I get this:
<pre><code class="hljs language-css">java.nio.file.NoSuchFileException: C:\Users\Administrator\Desktop\work\Default.txt
	at sun.nio.fs.WindowsException.translateToIOException(Unknown Source)
	at sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
	at sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
	at sun.nio.fs.WindowsFileSystemProvider.newByteChannel(Unknown Source)
	at java.nio.file.spi.FileSystemProvider.newOutputStream(Unknown Source)
	at java.nio.file.Files.newOutputStream(Unknown Source)
	at java.nio.file.Files.write(Unknown Source)
</code></pre>
Am I missing something?

Imagine there is a class:

    @Something(someProperty = &quot;some value&quot;)
    public class Foobar {
        //...
    }

Which is already compiled (I cannot control the source), and is part of the classpath when the jvm starts up.  I would like to be able to change &quot;some value&quot; to something else at runtime, such that any reflection thereafter would have my _new value_ instead of the default &quot;some value&quot;.

Is this possible?  If so, how?

Modify a class definition&#39;s annotation string parameter at runtime

There is XOR function in Java - `a^b`

For exemple: `5^3 = 6`

Can you tell me inverse function? If I have `6` and `3` can i get range of numbers which include number `5`?

What is inverse function to XOR?

I am seeking to run a common Java program in both Windows and Linux.

The program needs to do some things differently on each platform.

So how can / should my Java program detect it is running under Linux vs. Windows?

Detecting Windows or Linux?

How do you check if Java SDK is installed on a Mac?

Is there a command line for this?


How do I check if the Java JDK is installed on Mac?

I have a final class, something like this:


    public final class RainOnTrees{
    
       public void startRain(){
    
            // some code here
       }
    }

I am using this class in some other class like this:

    public class Seasons{
            
       RainOnTrees rain = new RainOnTrees();
            
       public void findSeasonAndRain(){
            
            rain.startRain();
            
        }
    }

and in my JUnit test class for `Seasons.java` I want to mock the `RainOnTrees` class. How can I do this with Mockito?





How to mock a final class with mockito

I have a method that will iterate through a folder and all of its subfolders and get a list of the file paths. However, I could only figure out how to create it and add the files to a public List&lt;string&gt;, but not how to return the list. Here&#39;s the method:

    public List&lt;String&gt; files = new List&lt;String&gt;();

    private void DirSearch(string sDir)
        {
            try
            {
                foreach (string f in Directory.GetFiles(sDir))
                {
                    files.Add(f);
                }
                foreach (string d in Directory.GetDirectories(sDir))
                {
                    DirSearch(d);
                }
            }
            catch (System.Exception excpt)
            {
                MessageBox.Show(excpt.Message);
            }
        }

So, i just call `DirSearch()` at some point in my code and it &#39;fills&#39; the list with the paths, but I want to be able to use it multiple times to create different lists with different directories, etc.

Method to get all files within folder and subfolders that will return a list

    for i in $(ls);do
        if [ $i = &#39;*.java&#39; ];then
            echo &quot;I do something with the file $i&quot;
        fi
    done

I want to loop through each file in the current folder and check if it matches a specific extension. The code above doesn&#39;t work, do you know why? 

Loop through all the files with a specific extension

`String` variable contains a file name, `C:\Hello\AnotherFolder\The File Name.PDF`. How do I only get the file name `The File Name.PDF` as a String?

I planned to split the string, but that is not the optimal solution.

How do I get the file name from a String containing the Absolute file path?

I am trying to create a folder for each username a user logs in as. Currently I have

    private String destination = &quot;C:/Users/Richard/printing~subversion/fileupload/web/WEB-INF/uploaded/&quot;; // main location for uploads
    File theFile = new File(destination + username); // will create a sub folder for each user 

but the `File theFile` bit does not create a new folder for the username. How would I do this ?

I have tried 

    private String destination;

    public void File() 
    {
        destination = &quot;C:/Users/Richard/printing~subversion/fileupload/web/WEB-INF/uploaded/&quot;; // main location for uploads
        File theFile = new File(destination + username); // will create a sub folder for each user (currently does not work, below hopefully is a solution) 
        theFile.mkdirs();
    }

but I need to use the destination later on in the program, how would I do that?

This is my whole code:


    /*
     * To change this template, choose Tools | Templates
     * and open the template in the editor.
     */
    package richard.fileupload;
    
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    import javax.annotation.PostConstruct;
    import javax.faces.application.FacesMessage;
    import javax.faces.context.FacesContext;
    import javax.faces.event.ActionEvent;
    import javax.faces.application.FacesMessage;
    import javax.faces.bean.ManagedBean;
    import javax.faces.bean.ViewScoped;
    import javax.faces.context.FacesContext;
    import java.io.File;
    import org.primefaces.event.FileUploadEvent;
    
    @ViewScoped
    @ManagedBean(name = &quot;fileUploadController&quot;)
    public class FileUploadController {
    
        /*
         public void handleFileUpload(FileUploadEvent event) {
         System.out.println(&quot;called&quot;);
         FacesMessage msg = new FacesMessage(&quot;Succesful&quot;, event.getFile().getFileName() + &quot; is uploaded.&quot;);
         FacesContext.getCurrentInstance().addMessage(null, msg);
         }
         }
         */
        private String username;
        private String destination;
    
        @PostConstruct
        public void init() {
            System.out.println(&quot;called get username&quot;);
            username = FacesContext.getCurrentInstance().getExternalContext().getRemoteUser();
        }
        
        public void File() {
        destination = &quot;C:/Users/Richard/printing~subversion/fileupload/web/WEB-INF/uploaded/&quot;; // main location for uploads
        File theFile = new File(destination + username); // will create a sub folder for each user (currently does not work, below hopefully is a solution) 
        theFile.mkdirs();
    }
    
        public File getDirectory(String destination, String username) {
            System.out.println(&quot;called get directory&quot;);
            // currently not working, is not calling the username or destination 
            //set the user directory from the destinarion and the logged user name
            File directory = new File(destination, username);
            //check if the location exists
            if (!directory.exists()) {
                //let&#39;s try to create it
                try {
                    directory.mkdir();
                } catch (SecurityException secEx) {
                    //handle the exception
                    secEx.printStackTrace(System.out);
                    directory = null;
                }
            }
            return directory;
        }
    
        public void handleFileUpload(FileUploadEvent event) {
            System.out.println(&quot;called handle file&quot;);
            FacesMessage msg = new FacesMessage(&quot;Succesful&quot;, event.getFile().getFileName() + &quot; is uploaded.&quot;); //Displays to user on the webpage
            FacesContext.getCurrentInstance().addMessage(null, msg);
            try {
                copyFile(event.getFile().getFileName(), event.getFile().getInputstream());
            } catch (IOException e) {
                //handle the exception
                e.printStackTrace();
            }
        }
    
        public void copyFile(String fileName, InputStream in) {
            try {
    
    
                // write the inputStream to a FileOutputStream
                OutputStream out = new FileOutputStream(new File(destination + fileName)); // cannot find path when adding username atm
                System.out.println(&quot;Called CopyFile&quot;); //testing 
                System.out.println(destination + fileName);
    
                int read = 0;
                byte[] bytes = new byte[1024];
    
                while ((read = in.read(bytes)) != -1) {
                    out.write(bytes, 0, read);
                }
    
                in.close();
                out.flush();
                out.close();
    //make sure new file is created, (displays in glassfish server console not to end user)
                System.out.println(&quot;New file created!&quot;);//testing
            } catch (IOException e) {
                e.printStackTrace();
    
                FacesMessage error = new FacesMessage(&quot;The files were not uploaded!&quot;);
                FacesContext.getCurrentInstance().addMessage(null, error);
            }
        }
    }


FINAL EDIT (Hopefully)

     public void copyFile(String fileName, InputStream in) {
            try {
    
                destination = &quot;C:/Users/Richard/printing~subversion/fileupload/web/WEB-INF/uploaded/&quot;; // main location for uploads
                File theFile = new File(destination + &quot;/&quot; + username); 
                theFile.mkdirs();// will create a sub folder for each user (currently does not work, below hopefully is a solution) (DOES NOW WORK)
                
                System.out.println(&quot;Completed File&quot;);
                // write the inputStream to a FileOutputStream
                OutputStream out = new FileOutputStream(new File(destination + fileName)); // cannot find path when adding username atm
                System.out.println(&quot;Called CopyFile&quot;); //testing 
                System.out.println(destination + fileName);
    
                int read = 0;
                byte[] bytes = new byte[1024];
    
                while ((read = in.read(bytes)) != -1) {
                    out.write(bytes, 0, read);
                }
    
                in.close();
                out.flush();
                out.close();
    //make sure new file is created, (displays in glassfish server console not to end user)
                System.out.println(&quot;New file created!&quot;);//testing
            } catch (IOException e) {
                e.printStackTrace();
    
                FacesMessage error = new FacesMessage(&quot;The files were not uploaded!&quot;);
                FacesContext.getCurrentInstance().addMessage(null, error);
            }
        }
    }

Just how can i print out the new destination and use this later on as currently it creates the new folder but does not select it to use


EDIT SOLVED THIS TOO :


        NewDestination = &quot;C:/Users/Richard/printing~subversion/fileupload/web/WEB-INF/uploaded/&quot; + username;

Added the above code and now it all works


Create intermediate folders if one doesn&#39;t exist

Currently i only RSync-ing the `Directories` as like:

    * * * * * rsync -avz /var/www/public_html/images root@&lt;remote-ip&gt;:/var/www/public_html

So how do i `rsync` one single file like, `/var/www/public_html/.htaccess` ?

How to RSYNC a single file?

I want to save a file to the internal storage by getting the text inputted from EditText. Then I want the same file to return the inputted text in String form and save it to another String which is to be used later.

Here&#39;s the code:

    package com.omm.easybalancerecharge;
    
    
    import android.app.Activity;
    import android.content.Context;
    import android.content.Intent;
    import android.net.Uri;
    import android.os.Bundle;
    import android.telephony.TelephonyManager;
    import android.view.Menu;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.TextView;
    
    public class MainActivity extends Activity {
    
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.activity_main);
    
    		final EditText num = (EditText) findViewById(R.id.sNum);
    		Button ch = (Button) findViewById(R.id.rButton);
    		TelephonyManager operator = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
    		String opname = operator.getNetworkOperatorName();
    		TextView status = (TextView) findViewById(R.id.setStatus);
    		final EditText ID = (EditText) findViewById(R.id.IQID);
    		Button save = (Button) findViewById(R.id.sButton);
    		
    		final String myID = &quot;&quot;; //When Reading The File Back, I Need To Store It In This String For Later Use
    
    		save.setOnClickListener(new OnClickListener() {
    
    			@Override
    			public void onClick(View v) {
    				// TODO Auto-generated method stub
    				
    				//Get Text From EditText &quot;ID&quot; And Save It To Internal Memory
    			}
    		});
    		if (opname.contentEquals(&quot;zain SA&quot;)) {
    			status.setText(&quot;Your Network Is: &quot; + opname);
    		} else {
    			status.setText(&quot;No Network&quot;);
    		}
    		ch.setOnClickListener(new OnClickListener() {
    
    			@Override
    			public void onClick(View v) {
    				// TODO Auto-generated method stub
    				
    				//Read From The Saved File Here And Append It To String &quot;myID&quot;
    			
    				
    				String hash = Uri.encode(&quot;#&quot;);
    				Intent intent = new Intent(Intent.ACTION_CALL);
    				intent.setData(Uri.parse(&quot;tel:*141*&quot; + /*Use The String With Data Retrieved Here*/ num.getText()
    						+ hash));
    				startActivity(intent);
    			}
    		});
    	}

I have included comments to help you further analyze my points as to where I want the operations to be done/variables to be used.

Read/Write String from/to a File in Android

I’m trying to write a simple text file reader by creating a function that takes in the file’s path and converts each line of text into a char array, but it’s not working.

    function readTextFile() {
      var rawFile = new XMLHttpRequest();
      rawFile.open(&quot;GET&quot;, &quot;testing.txt&quot;, true);
      rawFile.onreadystatechange = function() {
        if (rawFile.readyState === 4) {
          var allText = rawFile.responseText;
          document.getElementById(&quot;textSection&quot;).innerHTML = allText;
        }
      }
      rawFile.send();
    }

What is going wrong here?

This still doesn’t seem to work after changing the code a little bit from a [previous revision](https://stackoverflow.com/revisions/14446447/1) and now it’s giving me an `XMLHttpRequest` exception 101.

I’ve tested this on Firefox and it works, but in Google Chrome it just won’t work and it keeps giving me an Exception 101. How can I get this to work on not just Firefox, but also on other browsers (especially Chrome)?

How to read a local text file?

I&#39;ve got a log file directory that has 82000 files and directories in it (about half and half).

I need to delete all the file and directories which are older than 3 days.

In a directory that has 37000 files in it, I was able to do this with:

    find * -mtime +3 -exec rm {} \;

But with 82000 files/directories, I get the error:

&gt; /usr/bin/find: Argument list too long

**How can I get around this error so that I can delete all files/directories that are older than 3 days?**




How to delete all files older than 3 days when &quot;Argument list too long&quot;?

I have a REST service that reads a file and sends it to another console application after converting it to Byte array and then to Base64 string. This part works, but when the same stream is received at the application, it gets manipulated and is no longer a valid Base64 string. Some junk characters are getting introduced into the stream.

The exception received when converting the stream back to Byte is 

&gt; The input is not a valid Base-64 string as it contains a non-base 64
&gt; character, more than two padding characters, or a non-white space
&gt; character among the padding characters


**At Service:**

    [WebGet(UriTemplate = &quot;ReadFile/Convert&quot;, ResponseFormat = WebMessageFormat.Json)]  
    public string ExportToExcel()
      {
          string filetoexport = &quot;D:\\SomeFile.xls&quot;;
          byte[] data = File.ReadAllBytes(filetoexport);
          var s = Convert.ToBase64String(data);
          return s;
      }

**At Application:**

           var client = new RestClient(&quot;http://localhost:56877/User/&quot;);
           var request = new RestRequest(&quot;ReadFile/Convert&quot;, RestSharp.Method.GET);
           request.AddHeader(&quot;Accept&quot;, &quot;application/Json&quot;);
           request.AddHeader(&quot;Content-Type&quot;, &quot;application/Json&quot;);
           request.OnBeforeDeserialization = resp =&gt; {resp.ContentType =    &quot;application/Json&quot;;};
           var result = client.Execute(request);
           byte[] d = Convert.FromBase64String(result.Content); 


The input is not a valid Base-64 string as it contains a non-base 64 character

Lately I&#39;ve been asked to write a function that reads the binary file into the `std::vector&lt;BYTE&gt;` where `BYTE` is an `unsigned char`. Quite quickly I came with something like this:

    #include &lt;fstream&gt;
    #include &lt;vector&gt;
    typedef unsigned char BYTE;

    std::vector&lt;BYTE&gt; readFile(const char* filename)
    {
        // open the file:
        std::streampos fileSize;
        std::ifstream file(filename, std::ios::binary);

        // get its size:
        file.seekg(0, std::ios::end);
        fileSize = file.tellg();
        file.seekg(0, std::ios::beg);

        // read the data:
        std::vector&lt;BYTE&gt; fileData(fileSize);
        file.read((char*) &amp;fileData[0], fileSize);
        return fileData;
    }

which seems to be unnecessarily complicated and the explicit cast to `char*` that I was forced to use while calling `file.read` doesn&#39;t make me feel any better about it.  

---
Another option is to use [`std::istreambuf_iterator`](http://www.cplusplus.com/reference/iterator/istreambuf_iterator/):

    std::vector&lt;BYTE&gt; readFile(const char* filename)
    {
        // open the file:
        std::ifstream file(filename, std::ios::binary);

        // read the data:
        return std::vector&lt;BYTE&gt;((std::istreambuf_iterator&lt;char&gt;(file)),
                                  std::istreambuf_iterator&lt;char&gt;());
    }

which is pretty simple and short, but still I have to use the `std::istreambuf_iterator&lt;char&gt;` even when I&#39;m reading into `std::vector&lt;unsigned char&gt;`.

---
The last option that seems to be perfectly straightforward is to use [`std::basic_ifstream&lt;BYTE&gt;`](http://en.cppreference.com/w/cpp/io/basic_ifstream), which kinda expresses it explicitly that *&quot;I want an input file stream and I want to use it to read `BYTE`s&quot;*:

    std::vector&lt;BYTE&gt; readFile(const char* filename)
    {
        // open the file:
        std::basic_ifstream&lt;BYTE&gt; file(filename, std::ios::binary);

        // read the data:
        return std::vector&lt;BYTE&gt;((std::istreambuf_iterator&lt;BYTE&gt;(file)),
                                  std::istreambuf_iterator&lt;BYTE&gt;());
    }

but I&#39;m not sure whether [`basic_ifstream`](http://en.cppreference.com/w/cpp/io/basic_ifstream) is an appropriate choice in this case.

*What is the best way of reading a binary file into the `vector`?* I&#39;d also like to know what&#39;s happening *&quot;behind the scene&quot;* and what are the possible problems I might encounter (apart from stream not being opened properly which might be avoided by simple [`is_open`](http://www.cplusplus.com/reference/fstream/ifstream/is_open/) check).

Is there any good reason why one would prefer to use [`std::istreambuf_iterator`](http://www.cplusplus.com/reference/iterator/istreambuf_iterator/) here?  
(the only advantage that I can see is simplicity)

How to read a binary file into a vector of unsigned chars

I have the following code:

    List&lt;FileItem&gt; items = uploadHandler.parseRequest(request);
    for (FileItem item : items) {
        if (!item.isFormField()) {
            File file = new File(&quot;D:/Data&quot;);
        }
    }

When I am trying to save a file, I am getting the following error

&gt;     java.io.FileNotFoundException: D:\Data (Access is denied.)

What could be the reason and how can I resolve this? I do have read and write permission on this folder.







Java - Access is denied java.io.FileNotFoundException

I have a file named &quot;`word.txt`&quot;.

It is in the same directory as my `java` file.

But when I try to access it in the following code this _file not found_ error occurs:

    Exception in thread &quot;main&quot; java.io.FileNotFoundException: word.txt 
    (The system cannot find the file specified)
    	at java.io.FileInputStream.open(Native Method)
    	at java.io.FileInputStream.&lt;init&gt;(Unknown Source)
    	at java.util.Scanner.&lt;init&gt;(Unknown Source)
    	at Hangman1.main(Hangman1.java:6)

Here&#39;s my code:
    
    import java.io.File;
    import java.util.*;
    
    public class Hangman1 {
    	public static void main(String[] args) throws Exception {
    		Scanner input = new Scanner(new File(&quot;word.txt&quot;));   		
    		String in = &quot;&quot;;    		
    		in = input.nextLine();    		
    	}
    }

java.io.FileNotFoundException: the system cannot find the file specified

I am having a very weird problem with storage accessing on some devices. The app works on my testing devices (Nexus 4 &amp; 7, Samsung GS5). All my devices running Android 4.4.2. But I received many emails from users saying that the app can not write to the storage (neither the internal storage nor the sd card). From the log file received from user feedback, I can see the problem is the following code:

    try {
        if (fStream == null) {
        fStream = new FileOutputStream(filename, true);
    }
        fStream.write(data, 0, bytes);
        return;
    } catch (IOException ex) {
        ex.printStackTrace();
    }

It throws exception at the line fStream = new FileOutputStream(filename, true); when creating FileOutputStream.

The stack log is:

    W/System.err( 8147): Caused by: java.io.FileNotFoundException: /storage/emulated/0/my_folder/test_file_name.png: open failed: EACCES (Permission denied)
    w/System.err( 8147): 	at libcore.io.IoBridge.open(IoBridge.java:409)
    W/System.err( 8147): 	at java.io.FileOutputStream.&lt;init&gt;(FileOutputStream.java:88)
    W/System.err( 8147): 	at java.io.FileOutputStream.&lt;init&gt;(FileOutputStream.java:128)
    W/System.err( 8147): 	at myapp.save(SourceFile:515)
    W/System.err( 8147): 	... 8 more
    W/System.err( 8147): Caused by: libcore.io.ErrnoException: open failed: EACCES (Permission denied)
    W/System.err( 8147): 	at libcore.io.Posix.open(Native Method)
    W/System.err( 8147): 	at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
    W/System.err( 8147): 	at libcore.io.IoBridge.open(IoBridge.java:393)
    W/System.err( 8147): 	... 11 more

In the AndroidManifest.xml I have the following permissions declared:

     &lt;uses-sdk android:minSdkVersion=&quot;14&quot; android:targetSdkVersion=&quot;19&quot;/&gt;
        &lt;uses-permission android:name=&quot;android.permission.INTERNET&quot;/&gt;
	&lt;uses-permission android:name=&quot;android.permission.ACCESS_NETWORK_STATE&quot;/&gt;
	&lt;uses-permission android:name=&quot;android.permission.ACCESS_WIFI_STATE&quot;/&gt;
	&lt;uses-permission android:name=&quot;android.permission.READ_EXTERNAL_STORAGE&quot; /&gt;
	&lt;uses-permission android:name=&quot;android.permission.WRITE_EXTERNAL_STORAGE&quot;/&gt; 

I&#39;ve confirmed that the users are using the correct app&#39;s private on the SD card. And what&#39;s more weird is that it fails to write to internal storage as well. How can this happen if I have both read &amp; write permissions? The users say they are not connecting their devices to the PC at that time.

Update

It turns out I am calling open and close FileOutputStream too frequently, which throws the FileNotFoundException at some point. Sounds more like a threading issue.

Content Type	Original Author	Original Content on Stackoverflow
Question	ioreskovic	View Question on Stackoverflow
Solution 1 - Java	Peter Lawrey	View Answer on Stackoverflow
Solution 2 - Java	DeLac	View Answer on Stackoverflow

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