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  • NullPointerException when linking to Service that uses ContentProvider

    - by Danny Chia
    H.i everyone, this is my first post here! Anyways, I'm trying to write a "todo list" application. It stores the data in a ContentProvider, which is accessed via a Service. However, my app crashes at launch. My code is below: Manifest file: <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.examples.todolist" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name" android:debuggable="True"> <activity android:name=".ToDoList" android:label="@string/app_name" android:theme="@style/ToDoTheme"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <service android:name="TodoService"/> <provider android:name="TodoProvider" android:authorities="com.examples.provider.todolist" /> </application> <uses-sdk android:minSdkVersion="7" /> </manifest> ToDoList.java: package com.examples.todolist; import com.examples.todolist.TodoService.LocalBinder; import java.util.ArrayList; import java.util.Date; import android.app.Activity; import android.content.SharedPreferences; import android.database.Cursor; import android.os.AsyncTask; import android.os.Bundle; import android.view.ContextMenu; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.ServiceConnection; import android.os.IBinder; import android.view.KeyEvent; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnKeyListener; import android.widget.AdapterView; import android.widget.EditText; import android.widget.ListView; import android.widget.Toast; public class ToDoList extends Activity { static final private int ADD_NEW_TODO = Menu.FIRST; static final private int REMOVE_TODO = Menu.FIRST + 1; private static final String TEXT_ENTRY_KEY = "TEXT_ENTRY_KEY"; private static final String ADDING_ITEM_KEY = "ADDING_ITEM_KEY"; private static final String SELECTED_INDEX_KEY = "SELECTED_INDEX_KEY"; private boolean addingNew = false; private ArrayList<ToDoItem> todoItems; private ListView myListView; private EditText myEditText; private ToDoItemAdapter aa; int entries = 0; int notifs = 0; //ToDoDBAdapter toDoDBAdapter; Cursor toDoListCursor; TodoService mService; boolean mBound = false; /** Called when the activity is first created. */ public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); myListView = (ListView)findViewById(R.id.myListView); myEditText = (EditText)findViewById(R.id.myEditText); todoItems = new ArrayList<ToDoItem>(); int resID = R.layout.todolist_item; aa = new ToDoItemAdapter(this, resID, todoItems); myListView.setAdapter(aa); myEditText.setOnKeyListener(new OnKeyListener() { public boolean onKey(View v, int keyCode, KeyEvent event) { if (event.getAction() == KeyEvent.ACTION_DOWN) if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) { ToDoItem newItem = new ToDoItem(myEditText.getText().toString(), 0); mService.insertTask(newItem); updateArray(); myEditText.setText(""); entries++; Toast.makeText(ToDoList.this, "Entry added", Toast.LENGTH_SHORT).show(); aa.notifyDataSetChanged(); cancelAdd(); return true; } return false; } }); registerForContextMenu(myListView); restoreUIState(); populateTodoList(); } private void populateTodoList() { // Get all the todo list items from the database. toDoListCursor = mService. getAllToDoItemsCursor(); startManagingCursor(toDoListCursor); // Update the array. updateArray(); Toast.makeText(this, "Todo list retrieved", Toast.LENGTH_SHORT).show(); } private void updateArray() { toDoListCursor.requery(); todoItems.clear(); if (toDoListCursor.moveToFirst()) do { String task = toDoListCursor.getString(toDoListCursor.getColumnIndex(ToDoDBAdapter.KEY_TASK)); long created = toDoListCursor.getLong(toDoListCursor.getColumnIndex(ToDoDBAdapter.KEY_CREATION_DATE)); int taskid = toDoListCursor.getInt(toDoListCursor.getColumnIndex(ToDoDBAdapter.KEY_ID)); ToDoItem newItem = new ToDoItem(task, new Date(created), taskid); todoItems.add(0, newItem); } while(toDoListCursor.moveToNext()); aa.notifyDataSetChanged(); } private void restoreUIState() { // Get the activity preferences object. SharedPreferences settings = getPreferences(0); // Read the UI state values, specifying default values. String text = settings.getString(TEXT_ENTRY_KEY, ""); Boolean adding = settings.getBoolean(ADDING_ITEM_KEY, false); // Restore the UI to the previous state. if (adding) { addNewItem(); myEditText.setText(text); } } @Override public void onSaveInstanceState(Bundle outState) { outState.putInt(SELECTED_INDEX_KEY, myListView.getSelectedItemPosition()); super.onSaveInstanceState(outState); } @Override public void onRestoreInstanceState(Bundle savedInstanceState) { int pos = -1; if (savedInstanceState != null) if (savedInstanceState.containsKey(SELECTED_INDEX_KEY)) pos = savedInstanceState.getInt(SELECTED_INDEX_KEY, -1); myListView.setSelection(pos); } @Override protected void onPause() { super.onPause(); // Get the activity preferences object. SharedPreferences uiState = getPreferences(0); // Get the preferences editor. SharedPreferences.Editor editor = uiState.edit(); // Add the UI state preference values. editor.putString(TEXT_ENTRY_KEY, myEditText.getText().toString()); editor.putBoolean(ADDING_ITEM_KEY, addingNew); // Commit the preferences. editor.commit(); } @Override public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); // Create and add new menu items. MenuItem itemAdd = menu.add(0, ADD_NEW_TODO, Menu.NONE, R.string.add_new); MenuItem itemRem = menu.add(0, REMOVE_TODO, Menu.NONE, R.string.remove); // Assign icons itemAdd.setIcon(R.drawable.add_new_item); itemRem.setIcon(R.drawable.remove_item); // Allocate shortcuts to each of them. itemAdd.setShortcut('0', 'a'); itemRem.setShortcut('1', 'r'); return true; } @Override public boolean onPrepareOptionsMenu(Menu menu) { super.onPrepareOptionsMenu(menu); int idx = myListView.getSelectedItemPosition(); String removeTitle = getString(addingNew ? R.string.cancel : R.string.remove); MenuItem removeItem = menu.findItem(REMOVE_TODO); removeItem.setTitle(removeTitle); removeItem.setVisible(addingNew || idx > -1); return true; } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); menu.setHeaderTitle("Selected To Do Item"); menu.add(0, REMOVE_TODO, Menu.NONE, R.string.remove); } @Override public boolean onOptionsItemSelected(MenuItem item) { super.onOptionsItemSelected(item); int index = myListView.getSelectedItemPosition(); switch (item.getItemId()) { case (REMOVE_TODO): { if (addingNew) { cancelAdd(); } else { removeItem(index); } return true; } case (ADD_NEW_TODO): { addNewItem(); return true; } } return false; } @Override public boolean onContextItemSelected(MenuItem item) { super.onContextItemSelected(item); switch (item.getItemId()) { case (REMOVE_TODO): { AdapterView.AdapterContextMenuInfo menuInfo; menuInfo =(AdapterView.AdapterContextMenuInfo)item.getMenuInfo(); int index = menuInfo.position; removeItem(index); return true; } } return false; } @Override public void onDestroy() { super.onDestroy(); } private void cancelAdd() { addingNew = false; myEditText.setVisibility(View.GONE); } private void addNewItem() { addingNew = true; myEditText.setVisibility(View.VISIBLE); myEditText.requestFocus(); } private void removeItem(int _index) { // Items are added to the listview in reverse order, so invert the index. //toDoDBAdapter.removeTask(todoItems.size()-_index); ToDoItem item = todoItems.get(_index); final long selectedId = item.getTaskId(); mService.removeTask(selectedId); entries--; Toast.makeText(this, "Entry deleted", Toast.LENGTH_SHORT).show(); updateArray(); } @Override protected void onStart() { super.onStart(); Intent intent = new Intent(this, TodoService.class); bindService(intent, mConnection, Context.BIND_AUTO_CREATE); } @Override protected void onStop() { super.onStop(); // Unbind from the service if (mBound) { unbindService(mConnection); mBound = false; } } private ServiceConnection mConnection = new ServiceConnection() { public void onServiceConnected(ComponentName className, IBinder service) { LocalBinder binder = (LocalBinder) service; mService = binder.getService(); mBound = true; } public void onServiceDisconnected(ComponentName arg0) { mBound = false; } }; public class TimedToast extends AsyncTask<Long, Integer, Integer> { @Override protected Integer doInBackground(Long... arg0) { if (notifs < 15) { try { Toast.makeText(ToDoList.this, entries + " entries left", Toast.LENGTH_SHORT).show(); notifs++; Thread.sleep(20000); } catch (InterruptedException e) { } } return 0; } } } TodoService.java: package com.examples.todolist; import android.app.Service; import android.content.ContentResolver; import android.content.ContentValues; import android.content.Intent; import android.database.Cursor; import android.os.Binder; import android.os.IBinder; public class TodoService extends Service { private final IBinder mBinder = new LocalBinder(); @Override public IBinder onBind(Intent arg0) { return mBinder; } public class LocalBinder extends Binder { TodoService getService() { return TodoService.this; } } public void insertTask(ToDoItem _task) { ContentResolver cr = getContentResolver(); ContentValues values = new ContentValues(); values.put(TodoProvider.KEY_CREATION_DATE, _task.getCreated().getTime()); values.put(TodoProvider.KEY_TASK, _task.getTask()); cr.insert(TodoProvider.CONTENT_URI, values); } public void updateTask(ToDoItem _task) { long tid = _task.getTaskId(); ContentResolver cr = getContentResolver(); ContentValues values = new ContentValues(); values.put(TodoProvider.KEY_TASK, _task.getTask()); cr.update(TodoProvider.CONTENT_URI, values, TodoProvider.KEY_ID + "=" + tid, null); } public void removeTask(long tid) { ContentResolver cr = getContentResolver(); cr.delete(TodoProvider.CONTENT_URI, TodoProvider.KEY_ID + "=" + tid, null); } public Cursor getAllToDoItemsCursor() { ContentResolver cr = getContentResolver(); return cr.query(TodoProvider.CONTENT_URI, null, null, null, null); } } TodoProvider.java: package com.examples.todolist; import android.content.*; import android.database.Cursor; import android.database.SQLException; import android.database.sqlite.SQLiteOpenHelper; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteQueryBuilder; import android.database.sqlite.SQLiteDatabase.CursorFactory; import android.net.Uri; import android.text.TextUtils; import android.util.Log; public class TodoProvider extends ContentProvider { public static final Uri CONTENT_URI = Uri.parse("content://com.examples.provider.todolist/todo"); @Override public boolean onCreate() { Context context = getContext(); todoHelper dbHelper = new todoHelper(context, DATABASE_NAME, null, DATABASE_VERSION); todoDB = dbHelper.getWritableDatabase(); return (todoDB == null) ? false : true; } @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sort) { SQLiteQueryBuilder tb = new SQLiteQueryBuilder(); tb.setTables(TODO_TABLE); // If this is a row query, limit the result set to the passed in row. switch (uriMatcher.match(uri)) { case TASK_ID: tb.appendWhere(KEY_ID + "=" + uri.getPathSegments().get(1)); break; default: break; } // If no sort order is specified sort by date / time String orderBy; if (TextUtils.isEmpty(sort)) { orderBy = KEY_ID; } else { orderBy = sort; } // Apply the query to the underlying database. Cursor c = tb.query(todoDB, projection, selection, selectionArgs, null, null, orderBy); // Register the contexts ContentResolver to be notified if // the cursor result set changes. c.setNotificationUri(getContext().getContentResolver(), uri); // Return a cursor to the query result. return c; } @Override public Uri insert(Uri _uri, ContentValues _initialValues) { // Insert the new row, will return the row number if // successful. long rowID = todoDB.insert(TODO_TABLE, "task", _initialValues); // Return a URI to the newly inserted row on success. if (rowID > 0) { Uri uri = ContentUris.withAppendedId(CONTENT_URI, rowID); getContext().getContentResolver().notifyChange(uri, null); return uri; } throw new SQLException("Failed to insert row into " + _uri); } @Override public int delete(Uri uri, String where, String[] whereArgs) { int count; switch (uriMatcher.match(uri)) { case TASKS: count = todoDB.delete(TODO_TABLE, where, whereArgs); break; case TASK_ID: String segment = uri.getPathSegments().get(1); count = todoDB.delete(TODO_TABLE, KEY_ID + "=" + segment + (!TextUtils.isEmpty(where) ? " AND (" + where + ')' : ""), whereArgs); break; default: throw new IllegalArgumentException("Unsupported URI: " + uri); } getContext().getContentResolver().notifyChange(uri, null); return count; } @Override public int update(Uri uri, ContentValues values, String where, String[] whereArgs) { int count; switch (uriMatcher.match(uri)) { case TASKS: count = todoDB.update(TODO_TABLE, values, where, whereArgs); break; case TASK_ID: String segment = uri.getPathSegments().get(1); count = todoDB.update(TODO_TABLE, values, KEY_ID + "=" + segment + (!TextUtils.isEmpty(where) ? " AND (" + where + ')' : ""), whereArgs); break; default: throw new IllegalArgumentException("Unknown URI " + uri); } getContext().getContentResolver().notifyChange(uri, null); return count; } @Override public String getType(Uri uri) { switch (uriMatcher.match(uri)) { case TASKS: return "vnd.android.cursor.dir/vnd.examples.task"; case TASK_ID: return "vnd.android.cursor.item/vnd.examples.task"; default: throw new IllegalArgumentException("Unsupported URI: " + uri); } } // Create the constants used to differentiate between the different URI // requests. private static final int TASKS = 1; private static final int TASK_ID = 2; private static final UriMatcher uriMatcher; // Allocate the UriMatcher object, where a URI ending in 'tasks' will // correspond to a request for all tasks, and 'tasks' with a // trailing '/[rowID]' will represent a single task row. static { uriMatcher = new UriMatcher(UriMatcher.NO_MATCH); uriMatcher.addURI("com.examples.provider.Todolist", "tasks", TASKS); uriMatcher.addURI("com.examples.provider.Todolist", "tasks/#", TASK_ID); } //The underlying database private SQLiteDatabase todoDB; private static final String TAG = "TodoProvider"; private static final String DATABASE_NAME = "todolist.db"; private static final int DATABASE_VERSION = 1; private static final String TODO_TABLE = "todolist"; // Column Names public static final String KEY_ID = "_id"; public static final String KEY_TASK = "task"; public static final String KEY_CREATION_DATE = "date"; public long insertTask(ToDoItem _task) { // Create a new row of values to insert. ContentValues newTaskValues = new ContentValues(); // Assign values for each row. newTaskValues.put(KEY_TASK, _task.getTask()); newTaskValues.put(KEY_CREATION_DATE, _task.getCreated().getTime()); // Insert the row. return todoDB.insert(TODO_TABLE, null, newTaskValues); } public boolean updateTask(long _rowIndex, String _task) { ContentValues newValue = new ContentValues(); newValue.put(KEY_TASK, _task); return todoDB.update(TODO_TABLE, newValue, KEY_ID + "=" + _rowIndex, null) > 0; } public boolean removeTask(long _rowIndex) { return todoDB.delete(TODO_TABLE, KEY_ID + "=" + _rowIndex, null) > 0; } // Helper class for opening, creating, and managing database version control private static class todoHelper extends SQLiteOpenHelper { private static final String DATABASE_CREATE = "create table " + TODO_TABLE + " (" + KEY_ID + " integer primary key autoincrement, " + KEY_TASK + " TEXT, " + KEY_CREATION_DATE + " INTEGER);"; public todoHelper(Context cn, String name, CursorFactory cf, int ver) { super(cn, name, cf, ver); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL(DATABASE_CREATE); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { Log.w(TAG, "Upgrading database from version " + oldVersion + " to " + newVersion + ", which will destroy all old data"); db.execSQL("DROP TABLE IF EXISTS " + TODO_TABLE); onCreate(db); } } } I've omitted the other files as I'm sure they are correct. When I run the program, LogCat shows that the NullPointerException occurs in populateTodoList(), at toDoListCursor = mService.getAllToDoItemsCursor(). mService is the Cursor object returned by TodoService. I've added the service to the Manifest file, but I still cannot find out why it's causing an exception. Thanks in advance.

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  • Exception from within a finally block

    - by schrödingers cat
    Consider the following code where LockDevice() could possibly fail and throw an exception on ist own. What happens in C# if an exception is raised from within a finally block? UnlockDevice(); try { DoSomethingWithDevice(); } finally { LockDevice(); // can fail with an exception }

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  • Zend Framework :: Ajax Requests

    - by dev-drupal
    Hi, I am looking out for any library that would facilitate Ajax in Zend (if any exist). Also can somebody throw some light on the built-in Ajax support that comes with ZF. I tried googling but was not satisfied with the results. -DevD

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  • Capturing Alt+PrintScreen hot key and clipboard contents

    - by kusanagi
    I setup catching hotkey on alt+printscreen. It catches perfectly but there is nothing in the buffer - no image. How can I get the image from Clipboard.GetImage() after catching hotkey? Here is the the code. using System; using System.Runtime.InteropServices; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; namespace Magic_Screenshot { public enum ModifierKey : uint { MOD_NULL = 0x0000, MOD_ALT = 0x0001, MOD_CONTROL = 0x0002, MOD_SHIFT = 0x0004, MOD_WIN = 0x0008, } public enum HotKey { PrintScreen, ALT_PrintScreen, CONTROL_PrintScreen } public class HotKeyHelper : IMessageFilter { const string MSG_REGISTERED = "??????? ??????? ??? ????????????????, ???????? UnRegister ??? ?????? ???????????."; const string MSG_UNREGISTERED = "??????? ??????? ?? ????????????????, ???????? Register ??? ???????????."; //?????? ?? ?????? ?????? singleton public HotKeyHelper() { } //public static readonly HotKeyHelper Instance = new HotKeyHelper(); public bool isRegistered; ushort atom; //ushort atom1; ModifierKey modifiers; Keys keyCode; public void Register(ModifierKey modifiers, Keys keyCode) { //??? ???????? ??? ????? ????? ? PreFilterMessage this.modifiers = modifiers; this.keyCode = keyCode; //?? ????????? ?? ??? ???????????? //if (isRegistered) // throw new InvalidOperationException(MSG_REGISTERED); //????????? atom, ??? ??????????? ?????? ??????????? atom = GlobalAddAtom(Guid.NewGuid().ToString()); //atom1 = GlobalAddAtom(Guid.NewGuid().ToString()); if (atom == 0) ThrowWin32Exception(); if (!RegisterHotKey(IntPtr.Zero, atom, modifiers, keyCode)) ThrowWin32Exception(); //if (!RegisterHotKey(IntPtr.Zero, atom1, ModifierKey.MOD_CONTROL, Keys.PrintScreen)) // ThrowWin32Exception(); //????????? ???? ? ??????? ???????? ????????? Application.AddMessageFilter(this); isRegistered = true; } public void UnRegister() { //?? ???????? ?? ??? ???????????? if (!isRegistered) throw new InvalidOperationException(MSG_UNREGISTERED); if (!UnregisterHotKey(IntPtr.Zero, atom)) ThrowWin32Exception(); GlobalDeleteAtom(atom); //??????? ???? ?? ??????? ???????? ????????? Application.RemoveMessageFilter(this); isRegistered = false; } //?????????? Win32Exception ? ????? ?? ????????? ????? ????????????? Win32 ??????? void ThrowWin32Exception() { throw new Win32Exception(Marshal.GetLastWin32Error()); } //???????, ???????????? ??? ??????????? ??????? HotKeys public event HotKeyHelperDelegate HotKeyPressed; public bool PreFilterMessage(ref Message m) { //???????? ?? ????????? WM_HOTKEY if (m.Msg == WM_HOTKEY && //???????? ?? ???? m.HWnd == IntPtr.Zero && //???????? virtual key code m.LParam.ToInt32() >> 16 == (int)keyCode && //???????? ?????? ????????????? (m.LParam.ToInt32() & 0x0000FFFF) == (int)modifiers && //???????? ?? ??????? ??????????? ????????? HotKeyPressed != null) { if ((m.LParam.ToInt32() & 0x0000FFFF) == (int)ModifierKey.MOD_CONTROL && (m.LParam.ToInt32() >> 16 == (int)Keys.PrintScreen)) { HotKeyPressed(this, EventArgs.Empty, HotKey.CONTROL_PrintScreen); } else if ((m.LParam.ToInt32() & 0x0000FFFF) == (int)ModifierKey.MOD_ALT && (m.LParam.ToInt32() >> 16 == (int)Keys.PrintScreen)) { HotKeyPressed(this, EventArgs.Empty, HotKey.ALT_PrintScreen); } else if (m.LParam.ToInt32() >> 16 == (int)Keys.PrintScreen) { HotKeyPressed(this, EventArgs.Empty, HotKey.PrintScreen); } } return false; } //??????????? Win32 ????????? ? ??????? const string USER32_DLL = "User32.dll"; const string KERNEL32_DLL = "Kernel32.dll"; const int WM_HOTKEY = 0x0312; [DllImport(USER32_DLL, SetLastError = true)] static extern bool RegisterHotKey(IntPtr hWnd, int id, ModifierKey fsModifiers, Keys vk); [DllImport(USER32_DLL, SetLastError = true)] static extern bool UnregisterHotKey(IntPtr hWnd, int id); [DllImport(KERNEL32_DLL, SetLastError = true)] static extern ushort GlobalAddAtom(string lpString); [DllImport(KERNEL32_DLL)] static extern ushort GlobalDeleteAtom(ushort nAtom); } } Where is the bug?

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  • Destructuring assignment in generator expressions and array comprehensions

    - by Eli Grey
    Why does for ([] in object); work fine but [void 0 for ([] in object)] or (void 0 for ([] in object)) throw a syntax error for invalid left-hand assignment? For example, I would expect the following code to work, but it doesn't (the assertion isn't even done due to the syntax error): let ( i = 0, arr = [1, 2, 3, 4], gen = (i for (i in arr) if (arr.hasOwnProperty(i)) ) { for ([] in gen) i++; console.assertEquals([void 0 for ([] in gen)].length, i); }

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  • Invalid parameter number: number of bound variables does not match number of tokens

    - by Alex
    I have a table: 'objects' with few columns: object_id:int, object_type:int, object_status:int, object_lati:float, object_long:float My query is : $stmt = $db->query('SELECT o.object_id, o.object_type, o.object_status, o.object_lati, o.object_long FROM objects o WHERE o.object_id = 1'); $res = $stmt->fetch(); Pdo throw error: SQLSTATE[HY093]: Invalid parameter number: number of bound variables does not match number of tokens When i remove column object_lati or object_long query is work fine.

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  • HttpClient response handler always returns closed stream

    - by Alex Ciminian
    I'm new to Java development so please bear with me. Also, I hope I'm not the champion of tl;dr :). I'm using HttpClient to make requests over Http (duh!) and I'd gotten it to work for a simple servlet that receives an URL as a query string parameter. I realized that my code could use some refactoring, so I decided to make my own HttpResponseHandler, to clean up the code, make it reusable and improve exception handling. I currently have something like this: public class HttpResponseHandler implements ResponseHandler<InputStream>{ public InputStream handleResponse(HttpResponse response) throws ClientProtocolException, IOException { int statusCode = response.getStatusLine().getStatusCode(); InputStream in = null; if (statusCode != HttpStatus.SC_OK) { throw new HttpResponseException(statusCode, null); } else { HttpEntity entity = response.getEntity(); if (entity != null) { in = entity.getContent(); // This works // for (int i;(i = in.read()) >= 0;) System.out.print((char)i); } } return in; } } And in the method where I make the actual request: HttpClient httpclient = new DefaultHttpClient(); HttpGet httpget = new HttpGet(target); ResponseHandler<InputStream> httpResponseHandler = new HttpResponseHandler(); try { InputStream in = httpclient.execute(httpget, httpResponseHandler); // This doesn't work // for (int i;(i = in.read()) >= 0;) System.out.print((char)i); return in; } catch (HttpResponseException e) { throw new HttpResponseException(e.getStatusCode(), null); } The problem is that the input stream returned from the handler is closed. I don't have any idea why, but I've checked it with the prints in my code (and no, I haven't used them both at the same time :). While the first print works, the other one gives a closed stream error. I need InputStreams, because all my other methods expect an InputStream and not a String. Also, I want to be able to retrieve images (or maybe other types of files), not just text files. I can work around this pretty easily by giving up on the response handler (I have a working implementation that doesn't use it), but I'm pretty curious about the following: Why does it do what it does? How do I open the stream, if something closes it? What's the right way to do this, anyway :)? I've checked the docs and I couldn't find anything useful regarding this issue. To save you a bit of Googling, here's the Javadoc and here's the HttpClient tutorial (Section 1.1.8 - Response handlers). Thanks, Alex

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  • Can I use Code Igniter with Concrete5?

    - by SkippyFire
    I am building a site that will (obvisouly) have a front end public portion that I want to drive with Concrete5, but then it will also have a members section that I would like to build with Code Igniter. Does anyone have any idea how I could do that? I guess I could just throw the Code Igniter code into a sub directory, but would I run into any issues with that?

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  • What is the difference between Sprint and Iteration in SCRUM and length of each Sprint?

    - by kurozakura
    1.Is there a difference between Sprint and an Iteration or one can have Iterations within a Sprint or Sprint is just the terminology used instead of Iteration in SCRUM? It will be helpful if someone can throw some light on this. 2.Suppose there are 4 sprints and you have decided the first sprint will go up to 10days is it required that other 3 sprints should have the same length of the 1st decided sprint's length??.

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  • Ambiguos class name

    - by Pedro Dias
    Hello If have a new project (ProjNew ) where i want to put several classes, that are on other project (ProjOld). The problem is i want to maintain the old classes marked with Obsolete to avoid running all my projects and check if they using it. But in that way this may throw a ambiguos class name error because i didn't explicity call by namespace.. There is an way to say in the obsolete what assymbly to use in ambiguity case=

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  • Entity Framework Update Entity along with child entities (add/update as necessary)

    - by Jorin
    I have a many-to-many relationship between Issues and Scopes in my EF Context. In ASP.NET MVC, I bring up an Edit form that allows the user to edit a particular Issue. At the bottom of the form, is a list of checkboxes that allow them to select which scopes apply to this issue. When editing an issue, it likely will always have some Scopes associated with it already--these boxes will be checked already. However, the user has the opportunity to check more scopes or remove some of the currently checked scopes. My code looked something like this to save just the Issue: using (var edmx = new MayflyEntities()) { Issue issue = new Issue { IssueID = id, TSColumn = formIssue.TSColumn }; edmx.Issues.Attach(issue); UpdateModel(issue); if (ModelState.IsValid) { //if (edmx.SaveChanges() != 1) throw new Exception("Unknown error. Please try again."); edmx.SaveChanges(); TempData["message"] = string.Format("Issue #{0} successfully modified.", id); } } So, when I try to add in the logic to save the associated scopes, I tried several things, but ultimately, this is what made the most sense to me: using (var edmx = new MayflyEntities()) { Issue issue = new Issue { IssueID = id, TSColumn = formIssue.TSColumn }; edmx.Issues.Attach(issue); UpdateModel(issue); foreach (int scopeID in formIssue.ScopeIDs) { var thisScope = new Scope { ID = scopeID }; edmx.Scopes.Attach(thisScope); thisScope.ProjectID = formIssue.ProjectID; if (issue.Scopes.Contains(thisScope)) { issue.Scopes.Attach(thisScope); //the scope already exists } else { issue.Scopes.Add(thisScope); // the scope needs to be added } } if (ModelState.IsValid) { //if (edmx.SaveChanges() != 1) throw new Exception("Unknown error. Please try again."); edmx.SaveChanges(); TempData["message"] = string.Format("Issue #{0} successfully modified.", id); } } But, unfortunately, that just throws the following exception: An object with the same key already exists in the ObjectStateManager. The ObjectStateManager cannot track multiple objects with the same key. What am I doing wrong?

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  • In Java What is the guaranteed way to get a FileLock from FileChannel while accessing a RandomAcces

    - by narasimha.bhat
    I am trying to use FileLock lock(long position, long size,boolean shared) in FileChannel object As per the javadoc it can throw OverlappingFileLockException. When I create a test program with 2 threads lock method seems to be waiting to acquire the lock (both exclusive and non exclusive) But when the number threads increases in the acutal scenario over lapping file lock exception is thrown and processing slows down due the block at File lock table. What is the best way to acquire lock avoiding the OverlappingFileLockException ?

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  • Java map / nio / NFS issue causing a VM fault: "a fault occurred in a recent unsafe memory access op

    - by Matthew Bloch
    I have written a parser class for a particular binary format (nfdump if anyone is interested) which uses java.nio's MappedByteBuffer to read through files of a few GB each. The binary format is just a series of headers and mostly fixed-size binary records, which are fed out to the called by calling nextRecord(), which pushes on the state machine, returning null when it's done. It performs well. It works on a development machine. On my production host, it can run for a few minutes or hours, but always seems to throw "java.lang.InternalError: a fault occurred in a recent unsafe memory access operation in compiled Java code", fingering one of the Map.getInt, getShort methods, i.e. a read operation in the map. The uncontroversial (?) code that sets up the map is this: /** Set up the map from the given filename and position */ protected void open() throws IOException { // Set up buffer, is this all the flexibility we'll need? channel = new FileInputStream(file).getChannel(); MappedByteBuffer map1 = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size()); map1.load(); // we want the whole thing, plus seems to reduce frequency of crashes? map = map1; // assumes the host writing the files is little-endian (x86), ought to be configurable map.order(java.nio.ByteOrder.LITTLE_ENDIAN); map.position(position); } and then I use the various map.get* methods to read shorts, ints, longs and other sequences of bytes, before hitting the end of the file and closing the map. I've never seen the exception thrown on my development host. But the significant point of difference between my production host and development is that on the former, I am reading sequences of these files over NFS (probably 6-8TB eventually, still growing). On my dev machine, I have a smaller selection of these files locally (60GB), but when it blows up on the production host it's usually well before it gets to 60GB of data. Both machines are running java 1.6.0_20-b02, though the production host is running Debian/lenny, the dev host is Ubuntu/karmic. I'm not convinced that will make any difference. Both machines have 16GB RAM, and are running with the same java heap settings. I take the view that if there is a bug in my code, there is enough of a bug in the JVM not to throw me a proper exception! But I think it is just a particular JVM implementation bug due to interactions between NFS and mmap, possibly a recurrence of 6244515 which is officially fixed. I already tried adding in a "load" call to force the MappedByteBuffer to load its contents into RAM - this seemed to delay the error in the one test run I've done, but not prevent it. Or it could be coincidence that was the longest it had gone before crashing! If you've read this far and have done this kind of thing with java.nio before, what would your instinct be? Right now mine is to rewrite it without nio :)

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  • WCF Troubleshooting from ASP.NET Client -- Help!

    - by Kobojunkie
    I am trying to call a method in my service that is as below, from an ASP.NET application. public bool ValidateUser(string username, string password) { try { // String CurrentLoggedInWindowsUserName = WindowsIdentity.GetCurrent().Name; // //primary identity of the call // String CurrentServiceSecurityContextPrimaryIdentityName = // ServiceSecurityContext.Current.PrimaryIdentity.Name; // } catch (Exception ex) { FaultExceptionFactory fct = new FaultExceptionFactory(); throw new FaultException<CustomFaultException>(fct.CreateFaultException(ex)); } return false; } The Config for the client end of my service is as below <binding name="WSHttpBinding_IMembershipService" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard" maxBufferPoolSize="524288" maxReceivedMessageSize="65536" messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="false" allowCookies="false"> <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /> <reliableSession ordered="true" inactivityTimeout="00:10:00" enabled="false" /> <security mode="Message"> <transport clientCredentialType="Windows" proxyCredentialType="None" realm="" /> <message clientCredentialType="Windows" negotiateServiceCredential="true" algorithmSuite="Default" establishSecurityContext="true" /> </security> </binding> Problem I keep having is when I call it; I get the following exception message. Server Error in '/' Application. The communication object, System.ServiceModel.Channels.ServiceChannel, cannot be used for communication because it is in the Faulted state. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.ServiceModel.CommunicationObjectFaultedException: The communication object, System.ServiceModel.Channels.ServiceChannel, cannot be used for communication because it is in the Faulted state. Stack Trace: [CommunicationObjectFaultedException: The communication object, System.ServiceModel.Channels.ServiceChannel, cannot be used for communication because it is in the Faulted state.] System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) +7596735 System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) +275 System.ServiceModel.ICommunicationObject.Close(TimeSpan timeout) +0 System.ServiceModel.ClientBase`1.System.ServiceModel.ICommunicationObject. Close(TimeSpan timeout) +142 System.ServiceModel.ClientBase`1.Close() +38 System.ServiceModel.ClientBase`1.System.IDisposable.Dispose() +4 Controls.Membership.accountLogin.ValidateUserCredentials(String UserName, String Password) in C:\ Petition.WebClient\Controls\ Membership\accountLogin.ascx.cs:49 Controls.Membership.accountLogin.Login1_Authenticate(Object sender, AuthenticateEventArgs e) in C:\ WebClient\ Controls\Membership \accountLogin.ascx.cs:55 I am not entirely sure why I keep getting this. Just in case, here is how I call my service from the client private bool ValidateUserCredentials(string UserName, string Password) { bool boolReturnValue = false; using(Members.MembershipServiceClient client = new Controls.Members.MembershipServiceClient()) { try { boolReturnValue = client.ValidateUser(UserName, Password); } catch (FaultException<CustomFaultException> ex) { throw ex; } } return boolReturnValue; } Anyone have any idea what I need to do in this case?

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  • Create an Xml file from an object (c#)

    - by remi bourgarel
    Hi All, I work as a web developer with a web designer and we usually do like this : - I create the system , I generate some Xml files - the designer display the xml files with xslt Nothing new. My problem is that I use Xml Serialization to create my xml files, but I never use Deserialization. So I'd like to know if there is a way to avoid fix like these : empty setter for my property empty parameter-less constructor implement IXmlSerializable and throw "notimplementedexception" on deserialization do a copy of the class with public fields thanks.

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  • GUI development in JAVA

    - by user309281
    Hi All To build a java-based GUI using jsp and servlets, what are the different factors that go into selection of frameworks like AJAX, JSF, Struts 1/Struts 2 etc. Also for each of the above pls throw some light on, what are the libraries, toolkits and IDE which are available? Thanks.

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  • dotnetopenauth pending request lost

    - by Graham
    I have dotnetopenauth working fine as a provider except when a user clicks the submit button multible times. Then the following error occurs: Throw New InvalidOperationException("There's no pending authentication request!") What is the best way to prevent this happening?

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  • JavaDB/Derby Error 08006

    - by Tom Brito
    In the article Using Java DB in Desktop Applications the Address Book demo have a method disconnect which have a try-catch block that catch and ignores the exception. If you add a printStackTrace you can see that the exception always occur. What's wrong here? The JavaDB should not throw this exception, or they should fix something in the example program?

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  • How do Relational Databases Work Under the Hood?

    - by Pierreten
    I've always been interested in how you can throw some SQL at at database, and it nearly instantaneously returns your results in an orderly manner without thinking about it as anything other than a black box. What is really going on? I'm pretty sure it has something to do with how values are laid out regularly in memory, similar to an array; but aside from that, I don't know much else. How is SQL parsed in a manner to facilitate all of this?

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  • Dynamically add a field to an object in matlab

    - by Marc
    Say I have a MATLAB object defined in a class file classdef foo properties bar end end And I create a foo object myfoo = foo(); Now I want to add another field to foo dynamically. What I want is foo.newfield = 42; but this will throw an error. I know there is a way to dynamically add a field/property to a MATLAB object but I can't remember it or find it easily in the help. Anyone know the syntax?

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  • How to request Transponder list from a TV satellite

    - by Muhammad alaa
    I have a DTV-DVB Mantis BDA satellite card and I was wondering if i can use it programmatically to request a satellite transponder list throw some library or if i should create one Where should i start? I saw applications do that such as ProgDVB, but i didn't know what is the idea behind that. Another question: is there any standard that define how to communicate with Satellite TV, and if there is where i can get/read it. thank you

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