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• Securely store a password in program code?

  - by Nick

  My application makes use of the RijndaelManaged class to encrypt data. As a part of this encryption, I use a SecureString object loaded with a password which get's get converted to a byte array and loaded into the RajindaelManaged object's Key at runtime. The question I have is the storage of this SecureString. A user entered password can be entered at run-time, and that can be "securely" loaded into a SecureString object, but if no user entered password is given, then I need to default to something. So ultimately the quesiton comes down to: If I have to have some known string or byte array to load into a SecureString object each time my application runs, how do I do that? The "encrypted" data ultimately gets decrypted by another application, so even if no user entered password is specified, I still need the data to be encrypted while it goes from one app to another. This means I can't have the default password be random, because the other app wouldn't be able to properly decrypt it. One possible solution I'm thinking is to create a dll which only spits out a single passphrase, then I use that passphrase and run it through a couple of different hashing/reorganizing functions at runtime before I ultimately feed it into the secureString object. Would this be secure enough?

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• Handling Unknown JSON Properties with Jackson

  - by henrik_lundgren

  Hi, For deserializing json with unknown field into an object there's @JsonAnySetter. But what if I read such json into my object, modify some known fields and write it back to json? The unknown properties will be lost. How do I handle such cases? Is it possible to map an object or do I have to read the data into a JsonNode or Map?

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• How to convert string HH:MM to Joda Duration?

  - by Lucas T

  I have a field in a form to state the time duration of an event. Say, the event is to last 15 mins. So the field will have the following value: 00:15 If it is to last 1 hour: 01:00, etc. How can I create a Joda Duration object with the string "HH:MM"? Looking at Joda Time home page, it mentions that it is possible to create a Duration object from specified object using ConverterManager and DurationConverter respectively. My question is, how can I implement the above interfaces so that I can create a Duration object by passing the a "4:30" parameter? Thanks in advance, Lucas

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• how to debug ExceptionInInitializationError?

  - by grmn.bob

  I am getting an exception in a very simple 'study' application, so I expect the problem to be in my project setup, but I don't know how to debug ... What is the context of the exception, "ExceptionInInitializationError"? Where is it documented? A: Search Android Developers Guide Stack trace from within Eclipse Debugger with: select thread - right-click - copy stack Thread [<3> main] (Suspended (exception ExceptionInInitializerError)) Class.newInstance() line: 1479 Instrumentation.newActivity(ClassLoader, String, Intent) line: 1021 ActivityThread.performLaunchActivity(ActivityThread$ActivityRecord, Intent) line: 2367 ActivityThread.handleLaunchActivity(ActivityThread$ActivityRecord, Intent) line: 2470 ActivityThread.access$2200(ActivityThread, ActivityThread$ActivityRecord, Intent) line: 119 ActivityThread$H.handleMessage(Message) line: 1821 ActivityThread$H(Handler).dispatchMessage(Message) line: 99 Looper.loop() line: 123 ActivityThread.main(String[]) line: 4310 Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method] Method.invoke(Object, Object...) line: 521 ZygoteInit$MethodAndArgsCaller.run() line: 860 ZygoteInit.main(String[]) line: 618 NativeStart.main(String[]) line: not available [native method]

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• How to make a model instance read-only after saving it once?

  - by Ryszard Szopa

  One of the functionalities in a Django project I am writing is sending a newsletter. I have a model, Newsletter and a function, send_newsletter, which I have registered to listen to Newsletter's post_save signal. When the newsletter object is saved via the admin interface, send_newsletter checks if created is True, and if yes it actually sends the mail. However, it doesn't make much sense to edit a newsletter that has already been sent, for the obvious reasons. Is there a way of making the Newsletter object read-only once it has been saved? Edit: I know I can override the save method of the object to raise an error or do nothin if the object existed. However, I don't see the point of doing that. As for the former, I don't know where to catch that error and how to communicate the user the fact that the object wasn't saved. As for the latter, giving the user false feedback (the admin interface saying that the save succeded) doesn't seem like a Good Thing. What I really want is allow the user to use the Admin interface to write the newsletter and send it, and then browse the newsletters that have already been sent. I would like the admin interface to show the data for sent newsletters in an non-editable input box, without the "Save" button. Alternatively I would like the "Save" button to be inactive.

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• How to customize pickle for django model objects

  - by muudscope

  I need to pickle a complex object that refers to django model objects. The standard pickling process stores a denormalized object in the pickle. So if the object changes on the database between pickling and unpickling, the model is now out of date. (I know this is true with in-memory objects too, but the pickling is a convenient time to address it.) So what I'd like is a way to not pickle the full django model object. Instead just store its class and id, and re-fetch the contents from the database on load. Can I specify a custom pickle method for this class? I'm happy to write a wrapper class around the django model to handle the lazy fetching from db, if there's a way to do the pickling.

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• png image store in database and retrieve in android 1.5

  - by hany

  hai, I am new to android. I have problem. This is my code but it will not work, the problem is in view binder. Please correct it. // this is my activity package com.android.Fruits2; import java.util.ArrayList; import java.util.HashMap; import android.app.ListActivity; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Bundle; import android.widget.SimpleAdapter; import android.widget.SimpleCursorAdapter; import android.widget.SimpleAdapter.ViewBinder; public class Fruits2 extends ListActivity { private DBhelper mDB; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // setContentView(R.layout.main); mDB = new DBhelper(this); mDB.Reset(); Bitmap img = BitmapFactory.decodeResource(getResources(), R.drawable.icon); mDB.createPersonEntry(new PersonData(img, "Harsha", 24,"mca")); String[] columns = {mDB.KEY_ID, mDB.KEY_IMG, mDB.KEY_NAME, mDB.KEY_AGE, mDB.KEY_STUDY}; String table = mDB.PERSON_TABLE; Cursor c = mDB.getHandle().query(table, columns, null, null, null, null, null); startManagingCursor(c); SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.data, c, new String[] {mDB.KEY_IMG, mDB.KEY_NAME, mDB.KEY_AGE, mDB.KEY_STUDY}, new int[] {R.id.img, R.id.name, R.id.age,R.id.study}); adapter.setViewBinder( new MyViewBinder()); setListAdapter(adapter); } } //my viewbinder package com.android.Fruits2; import android.database.Cursor; import android.graphics.BitmapFactory; import android.view.View; import android.widget.ImageView; import android.widget.SimpleCursorAdapter; public class MyViewBinder implements SimpleCursorAdapter.ViewBinder { public boolean setViewValue(View view, Cursor cursor, int columnIndex) { if( (view instanceof ImageView) ) { ImageView iv = (ImageView) view; byte[] img = cursor.getBlob(columnIndex); iv.setImageBitmap(BitmapFactory.decodeByteArray(img, 0, img.length)); return true; } return false; } } // data package com.android.Fruits2; import android.graphics.Bitmap; public class PersonData { private Bitmap bmp; private String name; private int age; private String study; public PersonData(Bitmap b, String n, int k, String v) { bmp = b; name = n; age = k; study = v; } public Bitmap getBitmap() { return bmp; } public String getName() { return name; } public int getAge() { return age; } public String getStudy() { return study; } } //dbhelper package com.android.Fruits2; import java.io.ByteArrayOutputStream; import android.content.ContentValues; import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import android.graphics.Bitmap; import android.provider.BaseColumns; public class DBhelper { public static final String KEY_ID = BaseColumns._ID; public static final String KEY_NAME = "name"; public static final String KEY_AGE = "age"; public static final String KEY_STUDY = "study"; public static final String KEY_IMG = "image"; private DatabaseHelper mDbHelper; private SQLiteDatabase mDb; private static final String DATABASE_NAME = "PersonalDB"; private static final int DATABASE_VERSION = 1; public static final String PERSON_TABLE = "Person"; private static final String CREATE_PERSON_TABLE = "create table "+PERSON_TABLE+" (" +KEY_ID+" integer primary key autoincrement, " +KEY_IMG+" blob not null, " +KEY_NAME+" text not null , " +KEY_AGE+" integer not null, " +KEY_STUDY+" text not null);"; private final Context mCtx; private boolean opened = false; private static class DatabaseHelper extends SQLiteOpenHelper { DatabaseHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } public void onCreate(SQLiteDatabase db) { db.execSQL(CREATE_PERSON_TABLE); } public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { db.execSQL("DROP TABLE IF EXISTS "+PERSON_TABLE); onCreate(db); } } public void Reset() { openDB(); mDbHelper.onUpgrade(this.mDb, 1, 1); closeDB(); } public DBhelper(Context ctx) { mCtx = ctx; mDbHelper = new DatabaseHelper(mCtx); } private SQLiteDatabase openDB() { if(!opened) mDb = mDbHelper.getWritableDatabase(); opened = true; return mDb; } public SQLiteDatabase getHandle() { return openDB(); } private void closeDB() { if(opened) mDbHelper.close(); opened = false; } public void createPersonEntry(PersonData about) { openDB(); ByteArrayOutputStream out = new ByteArrayOutputStream(); about.getBitmap().compress(Bitmap.CompressFormat.PNG, 100, out); ContentValues cv = new ContentValues(); cv.put(KEY_IMG, out.toByteArray()); cv.put(KEY_NAME, about.getName()); cv.put(KEY_AGE, about.getAge()); cv.put(KEY_STUDY, about.getStudy()); mDb.insert(PERSON_TABLE, null, cv); closeDB(); } } //data.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="wrap_content"> <ImageView android:id = "@+id/img" android:layout_width = "wrap_content" android:layout_height = "wrap_content" > </ImageView> <TextView android:id = "@+id/name" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:textSize="15dp" android:textColor="#ff0000" > </TextView> <TextView android:id = "@+id/age" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:textSize="15dp" android:textColor="#ff0000" /> <TextView android:id = "@+id/study" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:textSize="15dp" android:textColor="#ff0000" /> </LinearLayout> When I run this in android 1.6 and 2.1, it works. But when I run in android 1.5, not work. My application is android 1.5. Please correct and send code to me. Thank you.

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• Move to next item or position in List view on button click

  - by praveenb

  Hi, im new to Android programing I build a listview showing station names, that grabs its data from a URL. I used ArrayAdapter to accomplish listview with data. I need to navigate through station names in listview, using previous, next buttons click. I google for this task and tried in different ways to workout bt im not able to solve. shall any one pls help me out for this issue. Thanks in advance...... I tried like this ` private ListView stationList; . . public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.playscreen); // move up event handler preButton= (ImageButton) findViewById(R.id.prevButton); preButton.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { movePre(); } }); // move down event handler nxtButton= (ImageButton) findViewById(R.id.nextButton); nxtButton.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { moveNxt(); } }); stationList.setAdapter(new StationAdapter(this, android.R.layout.simple_list_item_1, _stationList)); } else { Log.d(TAG, "No Stations"); } } private void movePre(){ stationList.setSelection(stationList.getSelectedItemPosition() + 1); } // Move selected item "down" in the ViewList. private void moveNxt(){ stationList.setSelection(stationList.getSelectedItemPosition() + 1); } private class StationAdapter extends ArrayAdapter { private Vector<Station> items; public StationAdapter(Context context, int textViewResourceId, Vector<Station> items) { super(context, textViewResourceId, items); this.items = items; } public void setSelectedPosition(int pos){ selectedPos = pos; // inform the view of this change notifyDataSetChanged(); } public int getSelectedPosition(){ return selectedPos; } @Override public View getView(int position, View convertView, ViewGroup parent) { View v = convertView; if (v == null) { LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); v = vi.inflate(R.layout.row, null); } Station st = items.get(position); if (st != null) { TextView tt = (TextView) v.findViewById(R.id.toptext); TextView bt = (TextView) v.findViewById(R.id.bottomtext); if (tt != null) { tt.setText(st.getStationName()); } if (bt != null) { bt.setText(st.getCT()); } } return v; } } `

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• Java SortedMap to Scala TreeMap

  - by Dave

  I'm having trouble converting a java SortedMap into a scala TreeMap. The SortedMap comes from deserialization and needs to be converted into a scala structure before being used. Some background, for the curious, is that the serialized structure is written through XStream and on desializing I register a converter that says anything that can be assigned to SortedMap[Comparable[_],_] should be given to me. So my convert method gets called and is given an Object that I can safely cast because I know it's of type SortedMap[Comparable[_],_]. That's where it gets interesting. Here's some sample code that might help explain it. // a conversion from comparable to ordering scala> implicit def comparable2ordering[A <: Comparable[A]](x: A): Ordering[A] = new Ordering[A] { | def compare(x: A, y: A) = x.compareTo(y) | } comparable2ordering: [A <: java.lang.Comparable[A]](x: A)Ordering[A] // jm is how I see the map in the converter. Just as an object. I know the key // is of type Comparable[_] scala> val jm : Object = new java.util.TreeMap[Comparable[_], String]() jm: java.lang.Object = {} // It's safe to cast as the converter only gets called for SortedMap[Comparable[_],_] scala> val b = jm.asInstanceOf[java.util.SortedMap[Comparable[_],_]] b: java.util.SortedMap[java.lang.Comparable[_], _] = {} // Now I want to convert this to a tree map scala> collection.immutable.TreeMap() ++ (for(k <- b.keySet) yield { (k, b.get(k)) }) <console>:15: error: diverging implicit expansion for type Ordering[A] starting with method Tuple9 in object Ordering collection.immutable.TreeMap() ++ (for(k <- b.keySet) yield { (k, b.get(k)) })

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• jQuery parent element inner HTML

  - by Anton

  I am getting inner HTML of element by next way: $(this).context.innerHTML Then I am getting parent inner HTML: $(this).parent().context.innerHTML But this code returns same values. Any ideas what is wrong?

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• Reflection and changing a variables type at runtime?

  - by james-west

  Hi I'm trying to create an object Of a specific type. I've got the following code, but it fails because it can't cast the new table object to the one that is already defined. I need table to start of an IEnumerable type so I can't declare is an object. Public sub getTable(ByVal t as Type) Dim table As Table(Of Object) Dim tableType As Type = GetType(Table(Of )).MakeGenericType(t) table = FormatterServices.GetUninitializedObject(tableType) End sub So in short - is there a way of changing a variable type at runtime? (or a better way of doing what I'm doing) Thanks in advance. James

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• How to avoid null pointer error

  - by Jessy

  I trying to find whether the elements of 2 arrayLists are match or not. But this code give me error Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException since some of the elements are null. How can I solved this problem? String level []={"High","High","High","High","High","High"}; ArrayList<Object> n = new ArrayList<Object>(Arrays.asList(level)); String choice []={null,"High","Low","High",null,"Medium"}; ArrayList<Object> m = new ArrayList<Object>(Arrays.asList(choice)); //Check if the two arrayList are identical for(int i=0; i<m.size(); i++){ if(!(m.get(i).equals(n.get(i)))){ result= true; break; } } return result; }

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• Xcodebuild throws assert failures after successful build?

  - by Derek Clarkson

  Hi all, I'me getting the following after building from he command line using xcodebuild, ay ideas what might be wrong? ** BUILD SUCCEEDED ** 2010-06-06 20:20:12.916 xcodebuild[8267:80b] [MT] ASSERTION FAILURE in /SourceCache/DevToolsBase/DevToolsBase-1648/pbxcore/Target.subproj/PBXTarget.m:597 Details: Assertion failed: (nil == _buildContext) || (nil == [_buildContext target]) Object: <PBXLegacyTarget:0x104b97370> Method: -dealloc Thread: <NSThread: 0x100b141a0>{name = (null), num = 1} Backtrace: 0 0x000000010035feaf -[XCAssertionHandler handleFailureInMethod:object:fileName:lineNumber:messageFormat:arguments:] (in DevToolsCore) 1 0x000000010035fc1a _XCAssertionFailureHandler (in DevToolsCore) 2 0x00000001002790d1 -[PBXTarget dealloc] (in DevToolsCore) 3 0x00000001002911e8 -[PBXLegacyTarget dealloc] (in DevToolsCore) 4 0x00000001002c5b16 -[PBXTargetBookmark dealloc] (in DevToolsCore) 5 0x00007fff8224ff71 __CFBasicHashStandardCallback (in CoreFoundation) 6 0x00007fff82250931 __CFBasicHashDrain (in CoreFoundation) 7 0x00007fff822396b3 _CFRelease (in CoreFoundation) 8 0x0000000100254171 -[PBXProject dealloc] (in DevToolsCore) 9 0x00007fff82262d56 _CFAutoreleasePoolPop (in CoreFoundation) 10 0x00007fff841b530c -[NSAutoreleasePool drain] (in Foundation) 11 0x000000010000c60d 12 0x00000001000014f4 ** INTERNAL ERROR: Uncaught Exception ** Exception: ASSERTION FAILURE in /SourceCache/DevToolsBase/DevToolsBase-1648/pbxcore/Target.subproj/PBXTarget.m:597 Details: Assertion failed: (nil == _buildContext) || (nil == [_buildContext target]) Object: <PBXLegacyTarget:0x104b97370> Method: -dealloc Thread: <NSThread: 0x100b141a0>{name = (null), num = 1} Backtrace: 0 0x000000010035feaf -[XCAssertionHandler handleFailureInMethod:object:fileName:lineNumber:messageFormat:arguments:] (in DevToolsCore) 1 0x000000010035fc1a _XCAssertionFailureHandler (in DevToolsCore) 2 0x00000001002790d1 -[PBXTarget dealloc] (in DevToolsCore) 3 0x00000001002911e8 -[PBXLegacyTarget dealloc] (in DevToolsCore) 4 0x00000001002c5b16 -[PBXTargetBookmark dealloc] (in DevToolsCore) 5 0x00007fff8224ff71 __CFBasicHashStandardCallback (in CoreFoundation) 6 0x00007fff82250931 __CFBasicHashDrain (in CoreFoundation) 7 0x00007fff822396b3 _CFRelease (in CoreFoundation) 8 0x0000000100254171 -[PBXProject dealloc] (in DevToolsCore) 9 0x00007fff82262d56 _CFAutoreleasePoolPop (in CoreFoundation) 10 0x00007fff841b530c -[NSAutoreleasePool drain] (in Foundation) 11 0x000000010000c60d 12 0x00000001000014f4 Stack: 0 0x00007fff822ded06 __exceptionPreprocess (in CoreFoundation) 1 0x00007fff832470f3 objc_exception_throw (in libobjc.A.dylib) 2 0x00007fff823369b9 -[NSException raise] (in CoreFoundation) 3 0x000000010035ff6a -[XCAssertionHandler handleFailureInMethod:object:fileName:lineNumber:messageFormat:arguments:] (in DevToolsCore) 4 0x000000010035fc1a _XCAssertionFailureHandler (in DevToolsCore) 5 0x00000001002790d1 -[PBXTarget dealloc] (in DevToolsCore) 6 0x00000001002911e8 -[PBXLegacyTarget dealloc] (in DevToolsCore) 7 0x00000001002c5b16 -[PBXTargetBookmark dealloc] (in DevToolsCore) 8 0x00007fff8224ff71 __CFBasicHashStandardCallback (in CoreFoundation) 9 0x00007fff82250931 __CFBasicHashDrain (in CoreFoundation) 10 0x00007fff822396b3 _CFRelease (in CoreFoundation) 11 0x0000000100254171 -[PBXProject dealloc] (in DevToolsCore) 12 0x00007fff82262d56 _CFAutoreleasePoolPop (in CoreFoundation) 13 0x00007fff841b530c -[NSAutoreleasePool drain] (in Foundation) 14 0x000000010000c60d 15 0x00000001000014f4 Abort trap

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• Grails bean-fields plugin

  - by Don

  Hi, I'm having problems using the Grails bean-fields plugin with a class this is annotated Validateable, but is not a domain/command class. The root cause of the problem appears to be in this method of BeanTagLib.groovy private def getBeanConstraints(bean) { if (bean?.metaClass?.hasProperty(bean, 'constraints')) { def cons = bean.constraints if (cons != null) { if (log.debugEnabled) { log.debug "Bean is of type ${bean.class} - the constraints property was a [${cons.class}]" } // Safety check for the case where bean is no a proper domain/command object // This avoids confusing errors where constraints comes back as a Closure if (!(cons instanceof Map)) { if (log.warnEnabled) { log.warn "Bean of type ${bean.class} is not a domain class, command object or other validateable object - the constraints property was a [${cons.class}]" } } } else { if (log.warnEnabled) { log.warn "Bean of type ${bean.class} has no constraints" } } return cons } else return null } I tested out this method above in the grails console and when I pass an instance of MyBean into this method, it logs: Bean of type ${bean.class} is not a domain class, command object or other validateable object - the constraints property was a [${cons.class}] Because the constraints are returned as an instance of Closure instead of a Map. If I could figue out how to get a Map reference to the constraints of a @Validateable class (that is not a domain/command class), I guess I could resolve the problem. Thanks, Don

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• Which Django 1.2.x multilingual application to use?

  - by mawimawi

  There are a couple of different applications for internationalized content in Django. As of now I only have used http://code.google.com/p/django-multilingual/ in my production environments, but I wonder if there are "better" solutions for my wishes. What my staff users need is the following: An object is being created by a staff user in any language (e.g. "de") This object should be displayed in the german version of the website. When a staff user translates the object into a different language (e.g. "fr"), then the page must be visible in the french version as well. If an object is not translated in the visitor's currently selected language (e.g. "en"), then calling the objects url shall raise a 404 Error (or even better a notice that the object is only available in the languages "de" and "fr", and the visitor might be able to select one of the languages) My staff users are working in the admin interface, so the multilingual application must support this as well. I don't really care whether the multilingual app uses a single table with many fields (like title_en, title_de, title_fr) or a foreign key to a related table (as it is implemented in django-multlingual). I only want it to have a good admin interface and no "default" language, because some content might be available just in "de", and some other just in "fr" and "en". And the most important issue of course is compatibility with Django 1.2.x. What are your experiences and preferred apps, and why?

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• forward declare typedef'd struct

  - by Steve

  I can't figure out how to forward declare a windows struct. The definition is typedef struct _CONTEXT { .... } CONTEXT, *PCONTEXT I really don't want to pull into this header, as it gets included everywhere. I've tried struct CONTEXT and struct _CONTEXT with no luck (redefinition of basic types with the actuall struct in winnt.h.

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• Does JSON.js cause conflicts with Sys.Serialization.JavaScriptSerializer.serialize

  - by David Robbins

  I am using Telerik controls in my webforms and want to serialize object on the client. Since I am getting a stackoverflow error with Sys.Serialization.JavaScriptSerializer.deserialize I wanted to try JSON. With both JSON and and the MS library I get "Sys.Application is undefined." Has anyone encountered this what did you do as a work around? EDIT I am serializing my object on a parent page and passing them via an argument to a child window. The child window is in an IFRAME tag. The object can be used in the child page, but I receive the stackoverflow error when I serialize it. The object is an Array of objects.

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• Efficiently Determine if EF 4 POCO Already in ObjectSet

  - by Eric J.

  I'm trying EF 4 with POCO's on a small project for the first time. In my Repository implementation, I want to provide a method AddOrUpdate that will add a passed-in POCO to the repository if it's new, else do nothing (as the updated POCO will be saved when SaveChanges is called). My first thought was to do this: public void AddOrUpdate(Poco p) { if (!Ctx.Pocos.Contains<Poco>(p)) { Ctx.Pocos.AddObject(p); } } However that results in a NotSupportedException as documented under Referencing Non-Scalar Variables Not Supported (bonus question: why would that not be supported?) Just removing the Contains part and always calling AddObject results in an InvalidStateException: An object with the same key already exists in the ObjectStateManager. The existing object is in the Unchanged state. An object can only be added to the ObjectStateManager again if it is in the added state. So clearly EF 4 knows somewhere that this is a duplicate based on the key. What's a clean, efficient way for the Repository to update Pocos for either a new or pre-existing object when AddOrUpdate is called so that the subsequent call to SaveChanges() will do the right thing? I did consider carrying an isNew flag on the object itself, but I'm trying to take persistence ignorance as far as practical.

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• UIViewController rotate methods

  - by Corey Floyd

  What object is responsible for dipatching the UIViewController rotation method calls, i.e: – shouldAutorotateToInterfaceOrientation: – willRotateToInterfaceOrientation:duration: – willAnimateFirstHalfOfRotationToInterfaceOrientation:duration: – willAnimateSecondHalfOfRotationFromInterfaceOrientation:duration: – didRotateFromInterfaceOrientation: I imagine it is UIApplication (but maybe the AppDelegate or UIWindow). The next question, is how does the object know which UIViewController to talk to? How does it know which UIViewController has its view as the subview of the window? Is there a message you can send or a property you can set (of some object) that sets the "Active" UIViewController for the app?

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• Simulating pass by reference for an array reference (i.e. a reference to a reference) in Java

  - by Leif Andersen

  I was wondering, in java, is it possible to in anyway, simulate pass by reference for an array? Yes, I know the language doesn't support it, but is there anyway I can do it. Say, for example, I want to create a method that reverses the order of all the elements in an array. (I know that this code snippet isn't the best example, as there is a better algorithms to do this, but this is a good example of the type of thing I want to do for more complex problems). Currently, I need to make a class like this: public static void reverse(Object[] arr) { Object[] tmpArr = new Object[arr.length]; count = arr.length - 1; for(Object i : arr) tmpArr[count--] = i; // I would like to do arr = tmpArr, but that will only make the shallow // reference tmpArr, I would like to actually change the pointer they passed in // Not just the values in the array, so I have to do this: count = arr.length - 1; for(Object i : tmpArr) arr[count--] = i; return; } Yes, I know that I could just swap the values until I get to the middle, and it would be much more efficient, but for other, more complex purposes, is there anyway that I can manipulate the actual pointer? Again, thank you.

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• How to make efficient code emerge through unit testing

  - by Jean

  Hi, I participate in a TDD Coding Dojo, where we try to practice pure TDD on simple problems. It occured to me however that the code which emerges from the unit tests isn't the most efficient. Now this is fine most of the time, but what if the code usage grows so that efficiency becomes a problem. I love the way the code emerges from unit testing, but is it possible to make the efficiency property emerge through further tests ? Here is a trivial example in ruby: prime factorization. I followed a pure TDD approach making the tests pass one after the other validating my original acceptance test (commented at the bottom). What further steps could I take, if I wanted to make one of the generic prime factorization algorithms emerge ? To reduce the problem domain, let's say I want to get a quadratic sieve implementation ... Now in this precise case I know the "optimal algorithm, but in most cases, the client will simply add a requirement that the feature runs in less than "x" time for a given environment. require 'shoulda' require 'lib/prime' class MathTest < Test::Unit::TestCase context "The math module" do should "have a method to get primes" do assert Math.respond_to? 'primes' end end context "The primes method of Math" do should "return [] for 0" do assert_equal [], Math.primes(0) end should "return [1] for 1 " do assert_equal [1], Math.primes(1) end should "return [1,2] for 2" do assert_equal [1,2], Math.primes(2) end should "return [1,3] for 3" do assert_equal [1,3], Math.primes(3) end should "return [1,2] for 4" do assert_equal [1,2,2], Math.primes(4) end should "return [1,5] for 5" do assert_equal [1,5], Math.primes(5) end should "return [1,2,3] for 6" do assert_equal [1,2,3], Math.primes(6) end should "return [1,3] for 9" do assert_equal [1,3,3], Math.primes(9) end should "return [1,2,5] for 10" do assert_equal [1,2,5], Math.primes(10) end end # context "Functionnal Acceptance test 1" do # context "the prime factors of 14101980 are 1,2,2,3,5,61,3853"do # should "return [1,2,3,5,61,3853] for ${14101980*14101980}" do # assert_equal [1,2,2,3,5,61,3853], Math.primes(14101980*14101980) # end # end # end end and the naive algorithm I created by this approach module Math def self.primes(n) if n==0 return [] else primes=[1] for i in 2..n do if n%i==0 while(n%i==0) primes<<i n=n/i end end end primes end end end

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• How do I solve this error, "error while trying to deserialize parameter"

  - by Paul Rowland

  I have a web service that is working fine in one environment but not in another. The web service gets document meta data from SharePoint, it running on a server where I cant debug but with logging I confirmed that the method enters and exits successfully. What could be the reason for the errors? The error message is, The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter http://CompanyName.com.au/ProjectName:GetDocumentMetaDataResponse. The InnerException message was 'Error in line 1 position 388. 'Element' 'CustomFields' from namespace 'http://CompanyName.com.au/ProjectName' is not expected. Expecting element 'Id'.'. Please see InnerException for more details. The InnerException was System.ServiceModel.Dispatcher.NetDispatcherFaultException was caught Message="The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter http://CompanyName.com.au/ProjectName:GetDocumentMetaDataResponse. The InnerException message was 'Error in line 1 position 388. 'Element' 'CustomFields' from namespace 'http://CompanyName.com.au/ProjectName' is not expected. Expecting element 'Id'.'. Please see InnerException for more details." Source="mscorlib" Action="http://schemas.microsoft.com/net/2005/12/windowscommunicationfoundation/dispatcher/fault" StackTrace: Server stack trace: at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameterPart(XmlDictionaryReader reader, PartInfo part, Boolean isRequest) at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameter(XmlDictionaryReader reader, PartInfo part, Boolean isRequest) at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameters(XmlDictionaryReader reader, PartInfo[] parts, Object[] parameters, Boolean isRequest) at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeBody(XmlDictionaryReader reader, MessageVersion version, String action, MessageDescription messageDescription, Object[] parameters, Boolean isRequest) at System.ServiceModel.Dispatcher.OperationFormatter.DeserializeBodyContents(Message message, Object[] parameters, Boolean isRequest) at System.ServiceModel.Dispatcher.OperationFormatter.DeserializeReply(Message message, Object[] parameters) at System.ServiceModel.Dispatcher.ProxyOperationRuntime.AfterReply(ProxyRpc& rpc) at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc) at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout) at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs) at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation) at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message) Exception rethrown at [0]: at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) at CompanyName.ProjectName.External.Sharepoint.WebServiceProxies.SharepointProjectNameSiteService.ProjectNameSiteSoap.GetDocumentMetaData(GetDocumentMetaDataRequest request) at CompanyName.ProjectName.External.Sharepoint.WebServiceProxies.SharepointProjectNameSiteService.ProjectNameSiteSoapClient.CompanyName.ProjectName.External.Sharepoint.WebServiceProxies.SharepointProjectNameSiteService.ProjectNameSiteSoap.GetDocumentMetaData(GetDocumentMetaDataRequest request) in D:\Source\TFSRoot\ProjectName\trunk\CodeBase\External\CompanyName.ProjectName.External.Sharepoint.WebServiceProxies\Service References\SharepointProjectNameSiteService\Reference.cs:line 2141 at CompanyName.ProjectName.External.Sharepoint.WebServiceProxies.SharepointProjectNameSiteService.ProjectNameSiteSoapClient.GetDocumentMetaData(ListSummaryDto listSummary, FileCriteriaDto criteria, List`1 customFields) in D:\Source\TFSRoot\ProjectName\trunk\CodeBase\External\CompanyName.ProjectName.External.Sharepoint.WebServiceProxies\Service References\SharepointProjectNameSiteService\Reference.cs:line 2150 at CompanyName.ProjectName.Services.Shared.SharepointAdapter.GetDocumentMetaData(ListSummaryDto listSummary, FileCriteriaDto criteria, List`1 customFields) in D:\Source\TFSRoot\ProjectName\trunk\CodeBase\Services\CompanyName.ProjectName.Services\Shared\SharepointAdapter.cs:line 260 at CompanyName.ProjectName.Services.Project.ProjectDocumentService.SetSharepointDocumentData(List`1 sourceDocuments) in D:\Source\TFSRoot\ProjectName\trunk\CodeBase\Services\CompanyName.ProjectName.Services\Project\ProjectDocumentService.cs:line 1963 at CompanyName.ProjectName.Services.Project.ProjectDocumentService.GetProjectConversionDocumentsImplementation(Int32 projectId) in D:\Source\TFSRoot\ProjectName\trunk\CodeBase\Services\CompanyName.ProjectName.Services\Project\ProjectDocumentService.cs:line 3212 InnerException: System.Runtime.Serialization.SerializationException Message="Error in line 1 position 388. 'Element' 'CustomFields' from namespace 'http://CompanyName.com.au/ProjectName' is not expected. Expecting element 'Id'." Source="System.Runtime.Serialization" StackTrace: at System.Runtime.Serialization.XmlObjectSerializerReadContext.ThrowRequiredMemberMissingException(XmlReaderDelegator xmlReader, Int32 memberIndex, Int32 requiredIndex, XmlDictionaryString[] memberNames) at System.Runtime.Serialization.XmlObjectSerializerReadContext.GetMemberIndexWithRequiredMembers(XmlReaderDelegator xmlReader, XmlDictionaryString[] memberNames, XmlDictionaryString[] memberNamespaces, Int32 memberIndex, Int32 requiredIndex, ExtensionDataObject extensionData) at ReadFileMetaDataDtoFromXml(XmlReaderDelegator , XmlObjectSerializerReadContext , XmlDictionaryString[] , XmlDictionaryString[] ) at System.Runtime.Serialization.ClassDataContract.ReadXmlValue(XmlReaderDelegator xmlReader, XmlObjectSerializerReadContext context) at System.Runtime.Serialization.XmlObjectSerializerReadContext.ReadDataContractValue(DataContract dataContract, XmlReaderDelegator reader) at System.Runtime.Serialization.XmlObjectSerializerReadContext.InternalDeserialize(XmlReaderDelegator reader, String name, String ns, DataContract& dataContract) at System.Runtime.Serialization.XmlObjectSerializerReadContext.InternalDeserialize(XmlReaderDelegator xmlReader, Int32 id, RuntimeTypeHandle declaredTypeHandle, String name, String ns) at ReadArrayOfFileMetaDataDtoFromXml(XmlReaderDelegator , XmlObjectSerializerReadContext , XmlDictionaryString , XmlDictionaryString , CollectionDataContract ) at System.Runtime.Serialization.CollectionDataContract.ReadXmlValue(XmlReaderDelegator xmlReader, XmlObjectSerializerReadContext context) at System.Runtime.Serialization.XmlObjectSerializerReadContext.ReadDataContractValue(DataContract dataContract, XmlReaderDelegator reader) at System.Runtime.Serialization.XmlObjectSerializerReadContext.InternalDeserialize(XmlReaderDelegator reader, String name, String ns, DataContract& dataContract) at System.Runtime.Serialization.XmlObjectSerializerReadContext.InternalDeserialize(XmlReaderDelegator xmlReader, Int32 id, RuntimeTypeHandle declaredTypeHandle, String name, String ns) at ReadMetaDataSearchResultsDtoFromXml(XmlReaderDelegator , XmlObjectSerializerReadContext , XmlDictionaryString[] , XmlDictionaryString[] ) at System.Runtime.Serialization.ClassDataContract.ReadXmlValue(XmlReaderDelegator xmlReader, XmlObjectSerializerReadContext context) at System.Runtime.Serialization.XmlObjectSerializerReadContext.ReadDataContractValue(DataContract dataContract, XmlReaderDelegator reader) at System.Runtime.Serialization.XmlObjectSerializerReadContext.InternalDeserialize(XmlReaderDelegator reader, String name, String ns, DataContract& dataContract) at System.Runtime.Serialization.XmlObjectSerializerReadContext.InternalDeserialize(XmlReaderDelegator xmlReader, Int32 id, RuntimeTypeHandle declaredTypeHandle, String name, String ns) at ReadGetDocumentMetaDataResponseBodyFromXml(XmlReaderDelegator , XmlObjectSerializerReadContext , XmlDictionaryString[] , XmlDictionaryString[] ) at System.Runtime.Serialization.ClassDataContract.ReadXmlValue(XmlReaderDelegator xmlReader, XmlObjectSerializerReadContext context) at System.Runtime.Serialization.XmlObjectSerializerReadContext.ReadDataContractValue(DataContract dataContract, XmlReaderDelegator reader) at System.Runtime.Serialization.XmlObjectSerializerReadContext.InternalDeserialize(XmlReaderDelegator reader, String name, String ns, DataContract& dataContract) at System.Runtime.Serialization.XmlObjectSerializerReadContext.InternalDeserialize(XmlReaderDelegator xmlReader, Type declaredType, DataContract dataContract, String name, String ns) at System.Runtime.Serialization.DataContractSerializer.InternalReadObject(XmlReaderDelegator xmlReader, Boolean verifyObjectName) at System.Runtime.Serialization.XmlObjectSerializer.ReadObjectHandleExceptions(XmlReaderDelegator reader, Boolean verifyObjectName) at System.Runtime.Serialization.DataContractSerializer.ReadObject(XmlDictionaryReader reader, Boolean verifyObjectName) at System.ServiceModel.Dispatcher.DataContractSerializerOperationFormatter.DeserializeParameterPart(XmlDictionaryReader reader, PartInfo part, Boolean isRequest) InnerException:

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• Spring transaction demarcation causes new Hibernate session despite use of OSIV

  - by Kelly Ellis

  I'm using Hibernate with OpenSessionInViewInterceptor so that a single Hibernate session will be used for the entire HTTP request (or so I wish). The problem is that Spring-configured transaction boundaries are causing a new session to be created, so I'm running into the following problem (pseudocode): Start in method marked @Transactional(propagation = Propagation.SUPPORTS, readOnly = false) Hibernate session #1 starts Call DAO method to update object foo; foo gets loaded into session cache for session #1 Call another method to update foo.bar, this one is marked @Transactional(propagation = Propagation.REQUIRED, readOnly = false) Transaction demarcation causes suspension of current transaction synchronization, which temporarily unbinds the current Hibernate session Hibernate session #2 starts since there's no currently-existing session Update field bar on foo (loading foo into session cache #2); persist to DB Transaction completes and method returns, session #1 resumes Call yet another method to update another field on foo Load foo from session cache #1, with old, incorrect value of bar Update field foo.baz, persist foo to DB foo.bar's old value overwrites the change we made in the previous step Configuration looks like: <bean name="openSessionInViewInterceptor" class="org.springframework.orm.hibernate3.support.OpenSessionInViewInterceptor" autowire="byName"> <property name="flushModeName"> <value>FLUSH_AUTO</value> </property> </bean> <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="myDataSource" /> </bean> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <property name="useTransactionAwareDataSource" value="true" /> <property name="mappingLocations"> <list> <value>/WEB-INF/xml/hibernate/content.hbm.xml</value> </list> </property> <property name="lobHandler"> <ref local="oracleLobHandler" /> </property> <!--property name="entityInterceptor" ref="auditLogInterceptor" /--> <property name="hibernateProperties" ref="HibernateProperties" /> <property name="dataSource" ref="myDataSource" /> </bean> I've done some debugging and figured out exactly where this is happening, here is the stack trace: Daemon Thread [http-8080-1] (Suspended (entry into method doUnbindResource in TransactionSynchronizationManager)) TransactionSynchronizationManager.doUnbindResource(Object) line: 222 TransactionSynchronizationManager.unbindResource(Object) line: 200 SpringSessionSynchronization.suspend() line: 115 DataSourceTransactionManager(AbstractPlatformTransactionManager).doSuspendSynchronization() line: 620 DataSourceTransactionManager(AbstractPlatformTransactionManager).suspend(Object) line: 549 DataSourceTransactionManager(AbstractPlatformTransactionManager).getTransaction(TransactionDefinition) line: 372 TransactionInterceptor(TransactionAspectSupport).createTransactionIfNecessary(TransactionAttribute, String) line: 263 TransactionInterceptor.invoke(MethodInvocation) line: 101 ReflectiveMethodInvocation.proceed() line: 171 JdkDynamicAopProxy.invoke(Object, Method, Object[]) line: 204 $Proxy14.changeVisibility(Long, ContentStatusVO, ContentAuditData) line: not available I can't figure out why transaction boundaries (even "nested" ones - though here we're just moving from SUPPORTS to REQUIRED) would cause the Hibernate session to be suspended, even though OpenSessionInViewInterceptor is in use. When the session is unbound, I see the following in my logs: [2010-02-16 18:20:59,150] DEBUG org.springframework.transaction.support.TransactionSynchronizationManager Removed value [org.springframework.orm.hibernate3.SessionHolder@7def534e] for key [org.hibernate.impl.SessionFactoryImpl@693f23a2] from thread [http-8080-1]

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• Problem with the DataTable and DataGridView objects

  - by Karol

  Hello everyone, I have the following problem In my aplication I doing some calculations and after it put them into DataTable object (6 columns, data in the latest one is most important). To view the results I put them into DataGridView object and there is my problem. Depending on the data contained in the last column I want to mark the cells on the appropriate colors. And I don't know if I should do this on the DataGridView object because this is user interfaces? Where I can do this? DataTable object doesn't have a style properties? Thanks a lot...

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• Trying to populate ListView in Android using objects from Parse

  - by mrwienerdog

  I am pretty darned new to android, and VERY new to Parse. I have created a class, StudentInformation, that includes columns for name, address, phone, etc. I would like to create a listview that contains the names of all students added to the class. How do I do this? I have got it to the point that I can Toast out the objectIDs of all of my entries, but can't figure out how to extract and add just the names to the ListView. Here is a snippet of the code: //Set up the listview studentListView = (ListView)findViewById(R.id.listViewStudents); //Create and populate an ArrayList of objects from parse ParseQuery query = new ParseQuery("StudentInformation"); final ArrayList<Object> studentList = new ArrayList<Object>(); query.findInBackground(new FindCallback() { public void done(List<ParseObject> objects, ParseException e) { if (e == null) { Toast.makeText(getApplicationContext(), objects.toString(), Toast.LENGTH_LONG).show(); for(int i = 0;i < objects.size(); i++){ objects.get(i); studentList.add("name".toString()); } } else { Toast.makeText(getApplicationContext(), "Error", Toast.LENGTH_LONG).show(); } } }); //studentList.addAll(Arrays.asList(students)); listAdapter = new ArrayAdapter<Object>(this,android.R.layout.simple_list_item_1,studentList); studentListView.setAdapter(listAdapter); } I have left the toast in where I toatst out the objectIDs in the public void done.... method. Any help would be, as always, greatly appreciated. Should be mentioned (possibly), no errors are thrown, the listview just never gets populated after the toast disappears. Don't know if this will help anyone, but I took a bit from both posts below, and came up with this: //Set up the listview studentList = new ArrayList<String>(); //Create and populate an ArrayList of objects from parse listAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1); studentListView = (ListView)findViewById(R.id.listViewStudents); studentListView.setAdapter(listAdapter); final ParseQuery query = new ParseQuery("StudentInformation"); query.findInBackground(new FindCallback() { public void done(List<ParseObject> objects, ParseException e) { if (e == null) { //Toast.makeText(getApplicationContext(), objects.toString(), Toast.LENGTH_LONG).show(); for (int i = 0; i < objects.size(); i++) { Object object = objects.get(i); String name = ((ParseObject) object).getString("name").toString(); listAdapter.add(name); } } else { Toast.makeText(getApplicationContext(), "Error", Toast.LENGTH_LONG).show(); } } });

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