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• How to populate a drop down list in Spring MVC

  - by GigaPr

  Hi, would like to populate a drop down list on a jsp page i have my page that looks like <form:form method="POST" action="addRss.htm" commandName="addNewRss" cssClass="addUserForm"> <div class="floatL"> <div class="padding5"> <div class="fieldContainer"> <strong>Title:</strong>&nbsp; </div> <form:errors path="title" cssClass="error"/> <form:input path="title" cssClass="textArea" /> </div> <div class="padding5"> <div class="fieldContainer"> <strong>Description:</strong>&nbsp; </div> <form:errors path="description" cssClass="error"/> <form:input path="description" cssClass="textArea" /> </div> <div class="padding5"> <div class="fieldContainer"> <strong>Language:</strong>&nbsp; </div> <form:errors path="language" cssClass="error"/> <form:select path="language" cssClass="textArea" /> </div> </div> <div class="floatR"> <div class="padding5"> <div class="fieldContainer"> <strong>Link:</strong>&nbsp; </div> <form:errors path="link" cssClass="error"/> <form:input path="link" cssClass="textArea" /> </div> <div class="padding5"> <div class="fieldContainer"> <strong>Url:</strong>&nbsp; </div> <form:errors path="url" cssClass="error"/> <form:input path="url" cssClass="textArea" /> </div> <div class="padding5"> <div class="fieldContainer"> <strong>Url</strong>&nbsp; </div> <form:errors path="url" cssClass="error"/> <form:input path="url" cssClass="textArea" /> </div> </div> <input type="submit" class="floatR" value="Add New Rss"> </form:form> and my controller public class AddRssController extends BaseController { private static final String[] LANGUAGES = { "AL", "AK", "AZ", "AR", "CA", "CO", "CT", "DE", "DC", "FL", "GA", "HI", "ID", "IL", "IN", "IA", "KS", "KY", "LA", "ME", "MD", "MA", "MI", "MN", "MS", "MO", "MT", "NE", "NV", "NH", "NJ", "NM", "NY", "NC", "ND", "OH", "OK", "OR", "PA", "RI", "SC", "SD", "TN", "TX", "UT", "VA", "VT", "WA", "WV", "WI", "WY" }; public AddRssController() { setCommandClass(RSS.class); setCommandName("addNewRss"); } @Override protected Object formBackingObject(HttpServletRequest request) throws Exception { RSS rantForm = (RSS) super.formBackingObject(request); // rantForm.setVehicle(new Vehicle()); return rantForm; } @Override protected Map referenceData(HttpServletRequest request) throws Exception { Map referenceData = new HashMap(); referenceData.put("language", LANGUAGES); return referenceData; } @Override protected ModelAndView onSubmit(Object command, BindException bindException) throws Exception { RSS rss = (RSS) command; rssServiceImplementation.add(rss); return new ModelAndView(getSuccessView()); } } and my BaseController public class BaseController extends SimpleFormController implements Controller { public UserServiceImplementation userServiceImplementation; public UserServiceImplementation getUserServiceImplementation() { return userServiceImplementation; } public void setUserServiceImplementation(UserServiceImplementation userServiceImplementation) { this.userServiceImplementation = userServiceImplementation; } public RssServiceImplementation rssServiceImplementation; public RssServiceImplementation getRssServiceImplementation() { return rssServiceImplementation; } public void setRssServiceImplementation(RssServiceImplementation rssServiceImplementation) { this.rssServiceImplementation = rssServiceImplementation; } } But it doesn t work Any suggestion?

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• Cannot convert the value in attribute '[attr]' to object of type 'System.Windows.TemplateBindingExte

  - by Krimson

  Hi, I get this error when I define my attached dependency properties in a class outside the class hierarchy and set the owner to a common parent class. Attached dependency property in WindowBase class (outside class hierarchy = generated error): public static readonly DependencyProperty AreaColorProperty = DependencyProperty.RegisterAttached("AreaColor", typeof(AreaColor), typeof(Window)); TemplateBinding that fails {TemplateBinding local:WindowBase.AreaColor} If I instead define the attached dependency property in a class within the class heirarchy and set the owner to this class, then I don't get any errors, why is this? Attached dependency property in WindowBase (within class hierarchy = no errors): public static readonly DependencyProperty AreaColorProperty = DependencyProperty.RegisterAttached("AreaColor", typeof(AreaColor), typeof(WindowBase)); Best Regards, Jesper

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• ASP.NET Cache Class - Are there differences between ASP.NET 3.5 and ASP.NET 4.0?

  - by hamlin11

  Are there any major differences between the ASP.NET Cache Class from ASP.NET 3.5 to 4.0?

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• In what case does IE8 block Javascript and how to avoid it ?

  - by e-satis

  I got a web site using jQuery, jQuery Tools and some handcrafted JS running performing graphical enhancements. While it's running smooth on FF, Safari and Chrome, IE blocks the script execution : There is nothing particularly more dangerous on this code than, let's say, on Netvibes. Why is even talking about activeX ? I'm using JS. And how can I prevent that ? I don't want my user to click on "I allow this website" to work. It would be like putting a big red absolute DIV reading "Live quick and never come back".

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• Is xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" a special case in XML?

  - by Bytecode Ninja

  When we use a namespace, we should also indicate where its associated XSD is located at, as can be seen in the following example: <?xml version="1.0"?> <Artist BirthYear="1958" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.webucator.com/Artist" xsi:schemaLocation="http://www.webucator.com/Artist Artist.xsd"> <Name> <Title>Mr.</Title> <FirstName>Michael</FirstName> <LastName>Jackson</LastName> </Name> </Artist> Here, we have indicated that Artist.xsd should be used for validating the http://www.webucator.com/Artist namespace. However, we are also using the http://www.w3.org/2001/XMLSchema-instance namespace, but we have not specified where its XSD is located at. How do XML parsers know how to handle this namespace? Thanks in advance.

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• Overloading *(iterator + n) and *(n + iterator) in a C++ iterator class?

  - by exscape

  (Note: I'm writing this project for learning only; comments about it being redundant are... uh, redundant. ;) I'm trying to implement a random access iterator, but I've found very little literature on the subject, so I'm going by trial and error combined with Wikpedias list of operator overload prototypes. It's worked well enough so far, but I've hit a snag. Code such as exscape::string::iterator i = string_instance.begin(); std::cout << *i << std::endl; works, and prints the first character of the string. However, *(i + 1) doesn't work, and neither does *(1 + i). My full implementation would obviously be a bit too much, but here's the gist of it: namespace exscape { class string { friend class iterator; ... public: class iterator : public std::iterator<std::random_access_iterator_tag, char> { ... char &operator*(void) { return *p; // After some bounds checking } char *operator->(void) { return p; } char &operator[](const int offset) { return *(p + offset); // After some bounds checking } iterator &operator+=(const int offset) { p += offset; return *this; } const iterator operator+(const int offset) { iterator out (*this); out += offset; return out; } }; }; } int main() { exscape::string s = "ABCDEF"; exscape::string::iterator i = s.begin(); std::cout << *(i + 2) << std::endl; } The above fails with (line 632 is, of course, the *(i + 2) line): string.cpp: In function ‘int main()’: string.cpp:632: error: no match for ‘operator*’ in ‘*exscape::string::iterator::operator+(int)(2)’ string.cpp:105: note: candidates are: char& exscape::string::iterator::operator*() *(2 + i) fails with: string.cpp: In function ‘int main()’: string.cpp:632: error: no match for ‘operator+’ in ‘2 + i’ string.cpp:434: note: candidates are: exscape::string exscape::operator+(const char*, const exscape::string&) My guess is that I need to do some more overloading, but I'm not sure what operator I'm missing.

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• What will with signed JWS application in case if certificate expires?

  - by Vladimir Bezugliy

  We have JWS application with signed jars. Certificate have some expiration day. What will happen after expiration day? Will it be possible to start application? If yes - what should be configured?

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• Why isnt the copy constructor of member class called?

  - by sandeep

  class member { public: member() { cout<<"Calling member constr"<<'\n'; } member(const member&) { cout<<"Calling member copy constr"<<'\n'; } }; class fred { public: fred() { cout<<"calling fred constr"<<'\n'; } fred(const fred &) { cout<<"Calling fred copy constr"<<'\n'; } protected: member member_; }; int main() { fred a; fred b=a; } Output: Calling member constr calling fred constr **Calling member constr** Calling fred copy constr

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• In WPF how to define a Data template in case of enum?

  - by Ashish Ashu

  I have a Enum defined as Type public Enum Type { OneType, TwoType, ThreeType }; Now I bind Type to a drop down Ribbon Control Drop Down Menu in a Ribbon Control that displays each menu with a MenuName with corresponding Image. ( I am using Syncfusion Ribbon Control ). I want that each enum type like ( OneType ) has data template defined that has Name of the menu and corrospending image. How can I define the data template of enum ? Please suggest me the solution, if this is possible !! Please also tell me if its not possible or I am thinking in the wrong direction !!

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• problems with infinite loop

  - by Tom

  function addAds($n) { for ($i=0;$i<=$n;$i++) { while($row=mysql_fetch_array(mysql_query("SELECT * FROM users"))) { $aut[]=$row['name']; } $author=$aut[rand(0,mysql_num_rows(mysql_query("SELECT * FROM users")))]; $name="pavadinimas".rand(0,3600); $rnd=rand(0,1); if($rnd==0) { $type="siulo"; } else { $type="iesko"; } $text="tekstas".md5("tekstas".rand(0,8000)); $time=time()-rand(3600,86400); $catid=rand(1,9); switch ($catid) { case 1: $subid=rand(1,8); break; case 2: $subid=rand(9,16); break; case 3: $subid=rand(17,24); break; case 4: $subid=rand(25,32); break; case 5: $subid=rand(33,41); break; case 6: $subid=rand(42,49); break; case 7: $subid=rand(50,56); break; case 8: $subid=rand(57,64); break; case 9: $subid=rand(65,70); break; } mysql_query("INSERT INTO advert(author,name,type,text,time,catid,subid) VALUES('$author','$name','$type','$text','$time','$catid','$subid')") or die(mysql_error()); } echo "$n adverts successfully added."; } The problem with this function, is that it never loads. As I noticed, my while loop causes it. If i comment it, everything is ok. It has to get random user from my db and set it to variable $author.

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• Fields of class, are they stored in the stack or heap?

  - by Mirek

  I saw a question yesterday which raised (for me) another question. Please look at the following code: public class Class1 { int A; //as I uderstand, int is value type and therefore lives in the stack } class Class2 { Run() { Class1 instance1 = new Class1(); instance1.A = 10; //it points to value type, but isnt this reference (on heap)? } } Or while creating the instance of Class1, its field types are created on the heap as well? But then I do not understand when it would really be on the stack as almost always you need to create an instance of object in order to use it fields.

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• Casting a object to a base class , return the extented object??

  - by CrazyJoe

  My Code: public class Contact { public string id{ get; set; } public string contact_type_id { get; set; } public string value{ get; set; } public string person_id { get; set; } public Contact() { } } public class Contact:Base.Contact { public ContactType ContactType { get; set; } public Person Person {get; set;} public Contact() { ContactType = new ContactType(); Person = new Person(); } } And: Contact c = new Contact(); Base.Contact cb = (Base.Contact)c; The Problem: The **cb** is set to **Contac** and not to **Base.Contact**. Have any trick to do that????

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• FindBugs: "may fail to close stream" - is this valid in case of InputStream?

  - by thSoft

  In my Java code, I start a new process, then obtain its input stream to read it: BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream())); FindBugs reports an error here: may fail to close stream Pattern id: OS_OPEN_STREAM, type: OS, category: BAD_PRACTICE Must I close the InputStream of another process? And what's more, according to its Javadoc, InputStream#close() does nothing. So is this a false positive, or should I really close the input stream of the process when I'm done?

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• What does JSLint's "Bad Escapement" mean in this case?

  - by karlthorwald

  I thougth "bad escapement" stands for wrong use escaping with slash. Why does JSLint bring up the message in this function on the 3d line (for...) ? function splitTags(commaSeparated) { var tagArray = commaSeparated.split(','); for (var i=tagArray.length - 1; i>=0; --i ){ tagArray[i] = f.trim(tagArray[i]); } return tagArray; }

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• How to build Android for Samsung Galaxy Note

  - by Tr?n Ð?i

  I'd like to modify and build my own Android for my Samsung Galaxy Note I've downloaded Android 4.1.2 from http://source.android.com and Samsung open source for my Samsung Galaxy Note. After extract Samsung open source, I get 2 folders: Kernel and Platform, and 2 README text file README_Kernel.txt 1. How to Build - get Toolchain From android git server , codesourcery and etc .. - arm-eabi-4.6 - edit build_kernel.sh edit "CROSS_COMPILE" to right toolchain path(You downloaded). EX) CROSS_COMPILE= $(android platform directory you download)/android/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi- Ex) CROSS_COMPILE=/usr/local/toolchain/arm-eabi-4.6/bin/arm-eabi- // check the location of toolchain - execute Kernel script $ ./build_kernel.sh 2. Output files - Kernel : arch/arm/boot/zImage - module : drivers/*/*.ko 3. How to Clean $ make clean README_Platform.txt [Step to build] 1. Get android open source. : version info - Android 4.1 ( Download site : http://source.android.com ) 2. Copy module that you want to build - to original android open source If same module exist in android open source, you should replace it. (no overwrite) # It is possible to build all modules at once. 3. You should add module name to 'PRODUCT_PACKAGES' in 'build\target\product\core.mk' as following case. case 1) bluetooth : should add 'audio.a2dp.default' to PRODUCT_PACKAGES case 2) e2fsprog : should add 'e2fsck' to PRODUCT_PACKAGES case 3) libexifa : should add 'libexifa' to PRODUCT_PACKAGES case 4) libjpega : should add 'libjpega' to PRODUCT_PACKAGES case 5) KeyUtils : should add 'libkeyutils' to PRODUCT_PACKAGES case 6) bluetoothtest\bcm_dut : should add 'bcm_dut' to PRODUCT_PACKAGES ex.) [build\target\product\core.mk] - add all module name for case 1 ~ 6 at once PRODUCT_PACKAGES += \ e2fsck \ libexifa \ libjpega \ libkeyutils \ bcm_dut \ audio.a2dp.default 4. In case of 'bluetooth', you should add following text in 'build\target\board\generic\BoardConfig.mk' BOARD_HAVE_BLUETOOTH := true BOARD_HAVE_BLUETOOTH_BCM := true 5. excute build command ./build.sh user What I need to do after followed 2 above files

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• How do I create an instance of this class in Android?

  - by Lloyd Banks

  I was wondering if it is possible to create an instance of this class (from the link, which creates a listview) from another class so that I can call on either lazyadapter.java or customizedlistview.java (not sure which one) to inflate that same listview. Is this possible? This is what I tried (obviously incorrect): CustomizedListView clv = new CustomizedListView(); clv.onCreate(...); source: http://www.androidhive.info/2012/02/android-custom-listview-with-image-and-text/ LazyAdapter.java import java.util.ArrayList; import java.util.HashMap; import android.app.Activity; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; public class LazyAdapter extends BaseAdapter { private Activity activity; private ArrayList&lt;HashMap&lt;String, String&gt;&gt; data; private static LayoutInflater inflater=null; public ImageLoader imageLoader; public LazyAdapter(Activity a, ArrayList&lt;HashMap&lt;String, String&gt;&gt; d) { activity = a; data=d; inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); imageLoader=new ImageLoader(activity.getApplicationContext()); } public int getCount() { return data.size(); } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { View vi=convertView; if(convertView==null) vi = inflater.inflate(R.layout.list_row, null); TextView title = (TextView)vi.findViewById(R.id.title); // title TextView artist = (TextView)vi.findViewById(R.id.artist); // artist name TextView duration = (TextView)vi.findViewById(R.id.duration); // duration ImageView thumb_image=(ImageView)vi.findViewById(R.id.list_image); // thumb image HashMap&lt;String, String&gt; song = new HashMap&lt;String, String&gt;(); song = data.get(position); // Setting all values in listview title.setText(song.get(CustomizedListView.KEY_TITLE)); artist.setText(song.get(CustomizedListView.KEY_ARTIST)); duration.setText(song.get(CustomizedListView.KEY_DURATION)); imageLoader.DisplayImage(song.get(CustomizedListView.KEY_THUMB_URL), thumb_image); return vi; } } CustomizedListView.java import java.util.ArrayList; import java.util.HashMap; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NodeList; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ListView; public class CustomizedListView extends Activity { // All static variables static final String URL = "http://api.androidhive.info/music/music.xml"; // XML node keys static final String KEY_SONG = "song"; // parent node static final String KEY_ID = "id"; static final String KEY_TITLE = "title"; static final String KEY_ARTIST = "artist"; static final String KEY_DURATION = "duration"; static final String KEY_THUMB_URL = "thumb_url"; ListView list; LazyAdapter adapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ArrayList&lt;HashMap&lt;String, String&gt;&gt; songsList = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;(); XMLParser parser = new XMLParser(); String xml = parser.getXmlFromUrl(URL); // getting XML from URL Document doc = parser.getDomElement(xml); // getting DOM element NodeList nl = doc.getElementsByTagName(KEY_SONG); // looping through all song nodes &lt;song&gt; for (int i = 0; i &lt; nl.getLength(); i++) { // creating new HashMap HashMap&lt;String, String&gt; map = new HashMap&lt;String, String&gt;(); Element e = (Element) nl.item(i); // adding each child node to HashMap key =&gt; value map.put(KEY_ID, parser.getValue(e, KEY_ID)); map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE)); map.put(KEY_ARTIST, parser.getValue(e, KEY_ARTIST)); map.put(KEY_DURATION, parser.getValue(e, KEY_DURATION)); map.put(KEY_THUMB_URL, parser.getValue(e, KEY_THUMB_URL)); // adding HashList to ArrayList songsList.add(map); } list=(ListView)findViewById(R.id.list); // Getting adapter by passing xml data ArrayList adapter=new LazyAdapter(this, songsList); list.setAdapter(adapter); // Click event for single list row list.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView&lt;?&gt; parent, View view, int position, long id) { } }); } }

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• Should we develop a custom membership provider in this case?

  - by Allen

  I'll be adding a bounty to this, probably 200, more if you guys think its appropriate. I wont accept an answer until I can add a bounty so feel free to go ahead and answer now Summary Long story short, we've been tasked with gutting the authentication and authorization parts of a fairly old and bloated asp.net application that previously had all of these components written from scratch. Since our application isn't a typical one, and none of us have experience in asp.net's built in membership provider stuff, we're not sure if we should roll our own authentication and authorization again or if we should try to work within the asp.net membership provider mindset and develop our own membership provider. Our Application We have a fairly old asp.net application that gets installed at customer locations to service clients on a LAN. Admins create users (users do not sign up) and depending on the install, we may have the software integrated with LDAP. Currently, the LDAP integration bulk-imports the users to our database and when they login, it authenticates against LDAP so we dont have to manage their passwords. Nothing amazing there. Admins can assign users to 1 group and they can change the authorization of that group to manage access to various parts of the software. Groups are maintained by Admins (web based UI) and as said earlier, granted / denied permissions to certain functionality within the application. All this was completely written from the ground up without using any of the built in .net authorization or authentication. We literally have IsLoggedIn() methods that check for login and redirect to our login page if they aren't. Our Rewrite We've been tasked to integrate more tightly with LDAP, they want us to tie groups in our application to groups (or whatever types of containers that LDAP uses) in LDAP so that when a customer opt's to use our LDAP integration, they dont have to manage their users in LDAP AND in our application. The new way, they will simply create users in LDAP, add them to Groups in LDAP and our application will see that they belong to the appropriate LDAP group and authenticate and authorize them. In addition, we've been granted the go ahead to completely rip out the User authentication and authorization code and completely re-do it. Our Problem The problem is that none of us have any experience with asp.net membership provider functionality. The little bit of exposure I have to it makes me worry that it was not intended to be used for an application such as ours. Though, developing our own ASP.NET Membership Provider and Role Manager sounds like it would be a great experience and most likely the appropriate thing to do. Basically, I'm looking for advice, should we be using the ASP.NET Membership provider & Role Management API or should we continue to roll our own? I know this decision will be influenced by our requirements so I'm going over them below Our Requirements Just a quick n dirty list Maintain the ability to have a db of users and authenticate them and give admins (only, not users) the ability to CRUD users Allow the site to integrate with LDAP, when this is chosen, they don't want any users stored in the DB, only the relationship between Groups as they exist in our app / db and the Groups/Containers as they exist in LDAP. .net 3.5 is being used (mix of asp.net webforms and asp.net mvc) Has to work in ASP.NET and ASP.NET MVC (shouldn't be a problem I'm guessing) This can't be user centric, administrators need to be the only ones that CRUD (or import via ldap) users and groups We have to be able to Auth via LDAP when its configured to do so I always try to monitor my questions closely so feel free to ask for more info. Also, as a general summary of what I'm looking for in an answer is just. "You should/shouldn't use xyz, here's why". Links regarding asp.net membership provider and role management stuff are very welcome, most of the stuff I'm finding is 5+ years old. Edit: Added some stuff to "Our Rewrite"

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• Niewbie OutOfMemory problem

  - by Nick

  So I am trying to create a producer/consumer type scala app. The LoopControl just sends a message to the MessageReceiver continoually. The MessageReceiver then delegates work to the MessageCreatorActor (whose work is to check a map for an object, and if not found create one and start it up). Each MessageActor created by this MessageCreatorActor is associated with an Id. Eventually this is where I want to do business logic. But I run out of memory after 15 minutes. Any help is appreciated import scala.actors.Actor import java.util.HashMap; import scala.actors.Actor._ case object LoopControl case object MessageReceiver case object MessageActor case object MessageActorCreator class MessageReceiver(msg: String) extends Actor { var messageActorMap = new HashMap[String, MessageActor] val messageCreatorActor = new MessageActorCreator(null, null) def act() { messageCreatorActor.start loop { react { case MessageActor(messageId) = if (msg.length() 0) { var messageActor = messageActorMap.get(messageId); if(messageActor == null) { messageCreatorActor ! MessageActorCreator(messageId, messageActorMap) }else { messageActor ! MessageActor } } } } } } case class MessageActorCreator(msg:String, messageActorMap: HashMap[String, MessageActor]) extends Actor { def act() { loop { react { case MessageActorCreator(messageId, messageActorMap) = if(messageId != null ) { var messageActor = new MessageActor(messageId); messageActorMap.put(messageId, messageActor) println(messageActorMap) messageActor.start messageActor ! MessageActor } } } } } class LoopControl(messageReceiver:MessageReceiver) extends Actor { var count : Int = 0; def act() { while (true) { messageReceiver ! MessageActor ("00-122-0X95-FEC0" + count) //Thread.sleep(100) count = count +1; if(count 5) { count = 0; } } } } case class MessageActor(msg: String) extends Actor { def act() { loop { react { case MessageActor = println() println("MessageActor: Got something- " + msg) } } } } object messages extends Application { val messageReceiver = new MessageReceiver("bootstrap") val loopControl = new LoopControl(messageReceiver) messageReceiver.start loopControl.start }

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• How do I enumerate a list of interfaces that are directly defined on an inheriting class/interface?

  - by Jordan

  Given the following C# class: public class Foo : IEnumerable<int> { // implementation of Foo and all its inherited interfaces } I want a method like the following that doesn't fail on the assertions: public void SomeMethod() { // This doesn't work Type[] interfaces = typeof(Foo).GetInterfaces(); Debug.Assert(interfaces != null); Debug.Assert(interfaces.Length == 1); Debug.Assert(interfaces[0] == typeof(IEnumerable<int>)); } Can someone help by fixing this method so the assertions don't fail? Calling typeof(Foo).GetInterfaces() doesn't work because it returns the entire interface hierarchy (i.e. interfaces variable contains IEnumerable<int> and IEnumerable), not just the top level.

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• Java: "Could not find the main class. Program will exit"

  - by AJ

  I'm trying to run SQuirreL SQL. I've downloaded it and installed it, but when I try to run it I get this error message: Java Virtual Machine Launcher. Could not find the main class. Program will exit. I get the gist of this, but I have not idea how to fix it. Any help? more info: I'm on Windows XP pro. I have java 1.6 installed, and other apps are running OK. The install ran OK. I believe I've followed the installation instructions correctly. To run it, I'm invoking the squirrel-sql.bat file. Update This question: http://stackoverflow.com/questions/1417328/could-not-find-the-main-class gives some background on this error from the point of view of a java developer.

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• MS Dynamics CRM trapping .NET error before I can handle it

  - by clifgriffin

  This is a fun one. I have written a custom search page that provides faster, more user friendly searches than the default Contacts view and also allows searching of Leads and Contacts simultaneously. It uses GridViews bound to SqlDataSources that query filtered views. I'm sure someone will complain that I'm not using the web services for this, but this is just the design decision we made. These GridViews live in UpdatePanels to enable very slick AJAX updates upon search. It's all working great. Nearly ready to be deployed, except for one thing: Some long running searches are triggering an uncatchable SQL timeout exception. [SqlException: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.] at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) at System.Data.SqlClient.SqlDataReader.ConsumeMetaData() at System.Data.SqlClient.SqlDataReader.get_MetaData() at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior) at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable) at System.Web.UI.WebControls.SqlDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) at System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) at System.Web.UI.WebControls.DataBoundControl.PerformSelect() at System.Web.UI.WebControls.BaseDataBoundControl.DataBind() at System.Web.UI.WebControls.GridView.DataBind() at System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() at System.Web.UI.WebControls.CompositeDataBoundControl.CreateChildControls() at System.Web.UI.Control.EnsureChildControls() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) I found that CRM is doing a server.transfer to capture this error because my UpdatePanels started throwing JavaSript errors when this error would occur. I was only able to get the full error message by using the JavaScript debugger in IE. Having found this error, I thought the solution would be simple. I just needed to wrap my databind calls in try/catch blocks to capture any errors. Unfortunately it seems CRM's IIS configuration has the magic ability to capture this error before it ever gets back to my code. Using the debugger I never see it. It never gets to my catch blocks, but it's clearly happening in the SQL Data Source which is clearly (by the stack trace) being triggered by my GridView bind. Any ideas on this? It's driving me crazy. Code Behind (with some irrelevant functions omitted): protected void Page_Load(object sender, EventArgs e) { //Initialize some stuff this.bannerOracle = new OdbcConnection(ConfigurationManager.ConnectionStrings["OracleConnectionString"].ConnectionString); //Prospect default HideProspects(); HideProspectAddressColumn(); //Contacts default HideContactAddressColumn(); //Default error messages gvContacts.EmptyDataText = "Sad day. Your search returned no contacts."; gvProspects.EmptyDataText = "Sad day. Your search returned no prospects."; //New search try { SearchContact(null, -1); } catch { gvContacts.EmptyDataText = "Oops! An error occured. This may have been a timeout. Please try your search again."; gvContacts.DataSource = null; gvContacts.DataBind(); } } protected void txtSearchString_TextChanged(object sender, EventArgs e) { if(!String.IsNullOrEmpty(txtSearchString.Text)) { try { SearchContact(txtSearchString.Text, Convert.ToInt16(lstSearchType.SelectedValue)); } catch { gvContacts.EmptyDataText = "Oops! An error occured. This may have been a timeout. Please try your search again."; gvContacts.DataSource = null; gvContacts.DataBind(); } if (chkProspects.Checked == true) { try { SearchProspect(txtSearchString.Text, Convert.ToInt16(lstSearchType.SelectedValue)); } catch { gvProspects.EmptyDataText = "Oops! An error occured. This may have been a timeout. Please try your search again."; gvProspects.DataSource = null; gvProspects.DataBind(); } finally { ShowProspects(); } } else { HideProspects(); } } } protected void SearchContact(string search, int type) { SqlCRM_Contact.ConnectionString = ConfigurationManager.ConnectionStrings["MSSQLConnectionString"].ConnectionString; gvContacts.DataSourceID = "SqlCRM_Contact"; string strQuery = ""; string baseQuery = @"SELECT filteredcontact.contactid, filteredcontact.new_libertyid, filteredcontact.fullname, 'none' AS line1, filteredcontact.emailaddress1, filteredcontact.telephone1, filteredcontact.birthdateutc AS birthdate, filteredcontact.gendercodename FROM filteredcontact "; switch(type) { case LASTFIRST: strQuery = baseQuery + "WHERE fullname LIKE @value AND filteredcontact.statecode = 0"; SqlCRM_Contact.SelectCommand = strQuery; SqlCRM_Contact.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case LAST: strQuery = baseQuery + "WHERE lastname LIKE @value AND filteredcontact.statecode = 0"; SqlCRM_Contact.SelectCommand = strQuery; SqlCRM_Contact.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case FIRST: strQuery = baseQuery + "WHERE firstname LIKE @value AND filteredcontact.statecode = 0"; SqlCRM_Contact.SelectCommand = strQuery; SqlCRM_Contact.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case LIBERTYID: strQuery = baseQuery + "WHERE new_libertyid LIKE @value AND filteredcontact.statecode = 0"; SqlCRM_Contact.SelectCommand = strQuery; SqlCRM_Contact.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case EMAIL: strQuery = baseQuery + "WHERE emailaddress1 LIKE @value AND filteredcontact.statecode = 0"; SqlCRM_Contact.SelectCommand = strQuery; SqlCRM_Contact.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case TELEPHONE: strQuery = baseQuery + "WHERE telephone1 LIKE @value AND filteredcontact.statecode = 0"; SqlCRM_Contact.SelectCommand = strQuery; SqlCRM_Contact.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case BIRTHDAY: strQuery = baseQuery + "WHERE filteredcontact.birthdateutc BETWEEN @dateStart AND @dateEnd AND filteredcontact.statecode = 0"; try { DateTime temp = DateTime.Parse(search); if (temp.Year < 1753 || temp.Year > 9999) { search = string.Empty; } else { search = temp.ToString("yyyy-MM-dd"); } } catch { search = string.Empty; } SqlCRM_Contact.SelectCommand = strQuery; SqlCRM_Contact.SelectParameters.Add("dateStart", DbType.String, search.Trim() + " 00:00:00.000"); SqlCRM_Contact.SelectParameters.Add("dateEnd", DbType.String, search.Trim() + " 23:59:59.999"); break; case SSN: //Do something break; case ADDRESS: strQuery = @"SELECT contactid, new_libertyid, fullname, line1, emailaddress1, telephone1, birthdate, gendercodename FROM (SELECT FC.contactid, FC.new_libertyid, FC.fullname, FA.line1, FC.emailaddress1, FC.telephone1, FC.birthdateutc AS birthdate, FC.gendercodename, ROW_NUMBER() OVER(PARTITION BY FC.contactid ORDER BY FC.contactid DESC) AS rn FROM filteredcontact FC INNER JOIN FilteredCustomerAddress FA ON FC.contactid = FA.parentid WHERE FA.line1 LIKE @value AND FA.addressnumber <> 1 AND FC.statecode = 0 ) AS RESULTS WHERE rn = 1"; SqlCRM_Contact.SelectCommand = strQuery; SqlCRM_Contact.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); ShowContactAddressColumn(); break; default: strQuery = @"SELECT TOP 500 filteredcontact.contactid, filteredcontact.new_libertyid, filteredcontact.fullname, 'none' AS line1, filteredcontact.emailaddress1, filteredcontact.telephone1, filteredcontact.birthdateutc AS birthdate, filteredcontact.gendercodename FROM filteredcontact WHERE filteredcontact.statecode = 0"; SqlCRM_Contact.SelectCommand = strQuery; break; } if (type != ADDRESS) { HideContactAddressColumn(); } gvContacts.PageIndex = 0; //try //{ // SqlCRM_Contact.DataBind(); //} //catch //{ // SqlCRM_Contact.DataBind(); //} gvContacts.DataBind(); } protected void SearchProspect(string search, int type) { SqlCRM_Prospect.ConnectionString = ConfigurationManager.ConnectionStrings["MSSQLConnectionString"].ConnectionString; gvProspects.DataSourceID = "SqlCRM_Prospect"; string strQuery = ""; string baseQuery = @"SELECT filteredlead.leadid, filteredlead.fullname, 'none' AS address1_line1, filteredlead.emailaddress1, filteredlead.telephone1, filteredlead.lu_dateofbirthutc AS lu_dateofbirth, filteredlead.lu_gendername FROM filteredlead "; switch (type) { case LASTFIRST: strQuery = baseQuery + "WHERE fullname LIKE @value AND filteredlead.statecode = 0"; SqlCRM_Prospect.SelectCommand = strQuery; SqlCRM_Prospect.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case LAST: strQuery = baseQuery + "WHERE lastname LIKE @value AND filteredlead.statecode = 0"; SqlCRM_Prospect.SelectCommand = strQuery; SqlCRM_Prospect.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case FIRST: strQuery = baseQuery + "WHERE firstname LIKE @value AND filteredlead.statecode = 0"; SqlCRM_Prospect.SelectCommand = strQuery; SqlCRM_Prospect.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case LIBERTYID: strQuery = baseQuery + "WHERE new_libertyid LIKE @value AND filteredlead.statecode = 0"; SqlCRM_Prospect.SelectCommand = strQuery; SqlCRM_Prospect.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case EMAIL: strQuery = baseQuery + "WHERE emailaddress1 LIKE @value AND filteredlead.statecode = 0"; SqlCRM_Prospect.SelectCommand = strQuery; SqlCRM_Prospect.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case TELEPHONE: strQuery = baseQuery + "WHERE telephone1 LIKE @value AND filteredlead.statecode = 0"; SqlCRM_Prospect.SelectCommand = strQuery; SqlCRM_Prospect.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); break; case BIRTHDAY: strQuery = baseQuery + "WHERE filteredlead.lu_dateofbirth BETWEEN @dateStart AND @dateEnd AND filteredlead.statecode = 0"; try { DateTime temp = DateTime.Parse(search); if (temp.Year < 1753 || temp.Year > 9999) { search = string.Empty; } else { search = temp.ToString("yyyy-MM-dd"); } } catch { search = string.Empty; } SqlCRM_Prospect.SelectCommand = strQuery; SqlCRM_Prospect.SelectParameters.Add("dateStart", DbType.String, search.Trim() + " 00:00:00.000"); SqlCRM_Prospect.SelectParameters.Add("dateEnd", DbType.String, search.Trim() + " 23:59:59.999"); break; case SSN: //Do nothing break; case ADDRESS: strQuery = @"SELECT filteredlead.leadid, filteredlead.fullname, filteredlead.address1_line1, filteredlead.emailaddress1, filteredlead.telephone1, filteredlead.lu_dateofbirthutc AS lu_dateofbirth, filteredlead.lu_gendername FROM filteredlead WHERE address1_line1 LIKE @value AND filteredlead.statecode = 0"; SqlCRM_Prospect.SelectCommand = strQuery; SqlCRM_Prospect.SelectParameters.Add("value", DbType.String, search.Trim() + "%"); ShowProspectAddressColumn(); break; default: strQuery = @"SELECT TOP 500 filteredlead.leadid, filteredlead.fullname, 'none' AS address1_line1 filteredlead.emailaddress1, filteredlead.telephone1, filteredlead.lu_dateofbirthutc AS lu_dateofbirth, filteredlead.lu_gendername FROM filteredlead WHERE filteredlead.statecode = 0"; SqlCRM_Prospect.SelectCommand = strQuery; break; } if (type != ADDRESS) { HideProspectAddressColumn(); } gvProspects.PageIndex = 0; //try //{ // SqlCRM_Prospect.DataBind(); //} //catch (Exception ex) //{ // SqlCRM_Prospect.DataBind(); //} gvProspects.DataBind(); }

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• Java: how does isDirectory and isFile work in File-class?

  - by HH

  $ javac GetAllDirs.java GetAllDirs.java:16: cannot find symbol symbol : variable checkFile location: class GetAllDirs System.out.println(checkFile.getName()); ^ 1 error $ cat GetAllDirs.java import java.util.*; import java.io.*; public class GetAllDirs { public void getAllDirs(File file) { if(file.isDirectory()){ System.out.println(file.getName()); File checkFile = new File(file.getCanonicalPath()); }else if(file.isFile()){ System.out.println(file.getName()); File checkFile = new File(file.getParent()); }else{ // checkFile should get Initialized at least HERE! File checkFile = file; } System.out.println(file.getName()); // WHY ERROR HERE: checkfile not found System.out.println(checkFile.getName()); } public static void main(String[] args) { GetAllDirs dirs = new GetAllDirs(); File current = new File("."); dirs.getAllDirs(current); } }

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• Java, filling arrays, and inheritance

  - by Arvanem

  Hi folks, I think I'm running into an inheritance conceptual wall with my Java arrays. I'm kind of new to Java so please tell me if I have things upside down. In essence, I want to do three things: Create a runnersArray with the attributes of my Runners class. Fill my runnersArray using my GenerateObjects method of my GenerateObjects class. Access the contents of my filled runnersArray in my Evaluating method of my Evaluating class. The problem seems to be that runnersArray is not visible to the methods in steps 2 and 3 above, but their classes (due to design reasons) cannot inherit or extend Runners class. Thanks in advance for any suggestions. Here are some code snippets showing what I'm trying to do: public class Runners extends Party { Runners[] runnersArray = new Runners[5]; } and public class GenerateObject extends /* certain parent class */ { public GenerateObject (int arrayNum) { runnersArray[arrayNum] = /* certain Runners attributes */; } } and public class Evaluating extends /*certain parent class*/ { public Evaluating (int arrayNum) { System.out.println(/* String cast attribute of runnersArray[arrayNum]*/; } }

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• Is the Scala 2.8 collections library a case of "the longest suicide note in history" ?

  - by oxbow_lakes

  First note the inflammatory subject title is a quotation made about the manifesto of a UK political party in the early 1980s. This question is subjective but it is a genuine question, I've made it CW and I'd like some opinions on the matter. Despite whatever my wife and coworkers keep telling me, I don't think I'm an idiot: I have a good degree in mathematics from the University of Oxford and I've been programming commercially for almost 12 years and in Scala for about a year (also commercially). I have just started to look at the Scala collections library re-implementation which is coming in the imminent 2.8 release. Those familiar with the library from 2.7 will notice that the library, from a usage perspective, has changed little. For example... > List("Paris", "London").map(_.length) res0: List[Int] List(5, 6) ...would work in either versions. The library is eminently useable: in fact it's fantastic. However, those previously unfamiliar with Scala and poking around to get a feel for the language now have to make sense of method signatures like: def map[B, That](f: A => B)(implicit bf: CanBuildFrom[Repr, B, That]): That For such simple functionality, this is a daunting signature and one which I find myself struggling to understand. Not that I think Scala was ever likely to be the next Java (or /C/C++/C#) - I don't believe its creators were aiming it at that market - but I think it is/was certainly feasible for Scala to become the next Ruby or Python (i.e. to gain a significant commercial user-base) Is this going to put people off coming to Scala? Is this going to give Scala a bad name in the commercial world as an academic plaything that only dedicated PhD students can understand? Are CTOs and heads of software going to get scared off? Was the library re-design a sensible idea? If you're using Scala commercially, are you worried about this? Are you planning to adopt 2.8 immediately or wait to see what happens? Steve Yegge once attacked Scala (mistakenly in my opinion) for what he saw as its overcomplicated type-system. I worry that someone is going to have a field day spreading fud with this API (similarly to how Josh Bloch scared the JCP out of adding closures to Java). Note - I should be clear that, whilst I believe that Josh Bloch was influential in the rejection of the BGGA closures proposal, I don't ascribe this to anything other than his honestly-held beliefs that the proposal represented a mistake.

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• How to add event listners / signals to a simple superman class?

  - by Kabumbus

  I can and would love to use boost or std for this. Sorry - I am new to C++. So I created a really simple program like: #include <iostream> #include <string> using namespace std; class superman { public: string punch(){return cout << "superman: I hit the bad guy!" << endl;}; }; int main() { superman clark; clark.punch(); cin.get(); } I want to add an event listner that would tell me when clark punched and cout something like "superman punched!". How to add such event listner and event function to my class?

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