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• @OneToOne and @JoinColumn, auto delete null entity , doable?

  - by smallufo

  I have two Entities , with the following JPA annotations : @Entity @Table(name = "Owner") public class Owner implements Serializable { @Id @GeneratedValue(strategy = GenerationType.AUTO) @Column(name = "id") private long id; @OneToOne(fetch=FetchType.EAGER , cascade=CascadeType.ALL) @JoinColumn(name="Data_id") private Data Data; } @Entity @Table(name = "Data") public class Data implements Serializable { @Id private long id; } Owner and Data has one-to-one mapping , the owning side is Owner. The problem occurs when I execute : owner.setData(null) ; ownerDao.update(owner) ; The "Owner" table's Data_id becomes null , that's correct. But the "Data" row is not deleted automatically. I have to write another DataDao , and another service layer to wrap the two actions ( ownerDao.update(owner) ; dataDao.delete(data); ) Is it possible to make a data row automatically deleted when the owning Owner set it to null ?

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• concatenating results from SQL query and NULL columns

  - by Curtis

  I need to concatenate several columns of a table into a single value, then show that value in an asp dropdownlist. The SQL code I'm issuing is as follows: SELECT UserID, CustomerNum, UserName + ' - ' + UserAddress + ',' + UserCity + ' ' + UserState AS UserInfo FROM Users WHERE (CustomerNum = @CustomerNum) ORDER BY UserName I then set 'UserInfo' as the text field in the dropdownlist. This generally works, except occasionally one of the columns in the database is null (for example, UserState). When that happens, the entire concatenation is null, and I get an empty entry in the dropdownlist. Is there something in SQLServer that will allow me to ignore those NULL results, or will I have to code something up in the DataBind event? Thanks

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• nullable type and a ReSharper warning

  - by Sarah Vessels

  I have the following code: private static LogLevel? _logLevel = null; public static LogLevel LogLevel { get { if (!_logLevel.HasValue) { _logLevel = readLogLevelFromFile(); } return _logLevel.Value; } } private static LogLevel readLogLevelFromFile() { ... } I get a ReSharper warning on the return statement about a possible System.InvalidOperationException and it suggests I check _logLevel to see if it is null first. However, readLogLevelFromFile returns LogLevel, not LogLevel?, so there is no way the return statement could be reached when _logLevel is null. Is this just an oversight by ReSharper, or am I missing something?

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• IEnumerable not null but calling Count() results in Exception

  - by Draak

  I have code that's working beautifully on my development machine, but when deployed to the server is throwing null reference exception. So, I can't step through the code, but I've pinned down the culprit. But now I am puzzled. Here's the code. The question is below. Dim certs = From p In persons _ Select New Certificate( _ p.Value, _ New CertificateData.Seminar(thisEvent.Seminar.Name, _ thisEvent.StartDate.Value, _ thisEvent.EndDate.Value, _ thisEvent.Venue.City, _ thisEvent.Venue.State, _ New CertificateData.Instructor( _ staffMember.Name, _ staffMember.Titles, _ instrSignatPath))) _ With {.CertificateId = p.Key} lblMessage.Text = CStr(certs Is Nothing) lblMessage.Text = lblMessage.Text + "<br />" + CStr(certs.Count()) In the code above persons is a dictionary of custom class, and certs is of IEnumerable type. Now here's the quandary.. The first line that sets the label returns False, so certs is not null. But the second line throws an null reference exception. How is this possible?

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• When can argv[0] have null ?

  - by andrew-dufresne

  What I have understand about passing arguments to main() from command line is that argc has a minimum value of 1 and argv[0] will always have the program name with its path in it. If arguments are provided at the command line, then argc will have a value greater than one and argv1 to argv[argc-1] will have those arguments. Now a paragraph at this link says that argv[0] will be a string containing the program's name or a null string if that is not available. Now, how and when can argv[0] have null string? I mean program name with its path will always be available so when can it be null? Writer says that "if that is not available" but when and how it is possible that program name will not be available? Thanks for your time and support. Regards

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• (this == null) in C#!

  - by SLaks

  Due to a bug that was fixed in C# 4, the following program prints true. (Try it in LINQPad) void Main() { new Derived(); } class Base { public Base(Func<string> valueMaker) { Console.WriteLine(valueMaker()); } } class Derived : Base { string CheckNull() { return "Am I null? " + (this == null); } public Derived() : base(() => CheckNull()) { } } In VS2008 in Release mode, in throws an InvalidProgramException. (In Debug mode, it works fine) In VS2010 Beta 2, it doesn't compile (I didn't try Beta 1); I learned that the hard way Is there any other way to make this == null in pure C#?

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• Nested for loop error with !null checking an element that doesn't exist

  - by Programatt

  I am currently using nested for loops in a 2D array of size 4,2. When I run my program, I get index out of bounds Exception on the following line else if (state[i][j+1] != null && state[i][j].getFlash() <= state[i][j].getCycleLength() && state[i][j+1].getCycleLength() == state[i][j].getCycleLength()){ } It says the index out of bounds is 2. I would understand the error if I wasn't checking to see if [i][j+1] wasn't null, but I don't understand the exception with the check? I tried moving around the !null check but the program still fails on this line. Any help would be greatly appreciated. Stack trace: Exception in thread "Timer-0" java.lang.ArrayIndexOutOfBoundsException: 2 at NatComp.data$1.run(data.java:67) at java.util.TimerThread.mainLoop(Timer.java:512) at java.util.TimerThread.run(Timer.java:462)

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• typeof === "undefined" vs. != null

  - by Thor Thurn

  I often see JavaScript code which checks for undefined parameters etc. this way: if (typeof input !== "undefined") { // do stuff } This seems kind of wasteful, since it involves both a type lookup and a string comparison, not to mention its verbosity. It's needed because 'undefined' could be renamed, though. My question is: How is that code any better than this approach: if (input != null) { // do stuff } As far as I know, you can't redefine null, so it's not going to break unexpectedly. And, because of the type-coercion of the != operator, this checks for both undefined and null... which is often exactly what you want (e.g. for optional function parameters). Yet this form does not seem widespread, and it even causes JSLint to yell at you for using the evil != operator. Why is this considered bad style?

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• C# Events and Lambdas, alternative to null check?

  - by Eugarps

  Does anybody see any drawbacks? It should be noted that you can't remove anonymous methods from an event delegate list, I'm aware of that (actually that was the conceptual motivation for this). The goal here is an alternative to: if (onFoo != null) onFoo.Invoke(this, null); And the code: public delegate void FooDelegate(object sender, EventArgs e); public class EventTest { public EventTest() { onFoo += (p,q) => { }; } public FireFoo() { onFoo.Invoke(this, null); } public event FooDelegate onFoo; }

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• JSP doPost getAtribute null value

  - by newbie123

  I want to pass value to servlet but I keep get null value. <jsp:useBean id="Helper" class="model.Registration" scope="request"/> <form action="/Project/Registration" method="post" enctype="multipart/form-data"> <input type="text" size="20" name="name" value="<%=Helper.getName()%>"> <input type="submit"> </form> protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Registrationh2 = (Registration) request.getAttribute("Helper"); if(h2!=null){ System. out.println(h2.getName()); } else System. out.println("NULL"); } Is there anything wrong with my code?

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• routing paramenter returns null when only supplying first paramenter in MVC

  - by Ray ForRespect

  My issue is that I customer Map Route in MVC which takes three parameters. When I supply all three or just two, the parameters are passed from the URL to my controller. However, when I only supply the first parameter, it is not passed and returns null. Not sure what causes this behavior. Route: routes.MapRoute( name: "Details", // Route name url: "{controller}/{action}/{param1}/{param2}/{param3}", // URL with parameters defaults: new { controller = "Details", action = "Index", param1 = UrlParameter.Optional, param2 = UrlParameter.Optional, param3 = UrlParameter.Optional } // Parameter defaults ); Controller: public ActionResult Map(string param1, string param2, string param3) { StoreMap makeMap = new StoreMap(); var storemap = makeMap.makeStoreMap(param1, param2, param3); var model = storemap; return View(model); } string param1 returns null when I navigate to: /StoreMap/Map/PARAM1NAME but it doesn't return null when I navigate to: /StoreMap/Map/PARAM1NAME/PARAM2NAME

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• Cannot output json from MySQL - getting null value

  - by sky

  I'm using following code but cannot return data from MySQL. This is the output: <script type="text/javascript"> var somethings= [null,null,null]; </script> It does have three post, but I couldn't get the title(message) output. EDIT: this is the code I'm using: <?php $session = mysql_connect('localhost','name','pass'); mysql_select_db('dbname', $session); $result= mysql_query('SELECT * FROM posts', $session); $somethings= array(); while ($row= mysql_fetch_assoc($result)) { $somethings[]= $row['something']; } ?> <script type="text/javascript"> var somethings= <?php echo json_encode($somethings); ?>; </script>

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• MVVM Binding To Property == Null

  - by LnDCobra

  I want to show some elements when a property is not null. What is the best way of achieving this? The following is my ViewModel: class ViewModel : ViewModelBase { public Trade Trade { get { return _trade; } set { SetField(ref _trade, value, () => Trade); } } private Trade _trade; } ViewModelBase inherits INotifyPropertyChanged and contains SetField() The Following is the Trade class: public class Trade : INotifyPropertyChaged { public virtual Company Company { get { return _company; } set { SetField(ref _company, value, () => Company); } } private Company _company; ...... } This is part of my View.xaml <GroupBox Visibility="{Binding Path=Trade.Company, Converter={StaticResource boolToVisConverter}}" /> I would like this groupbox to show only if Trade.Company is not null (so when a user selects a company). Would I need to create a custom converter to check for null and return the correct visibility or is there one in .NET?

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• custom ListView --Null pointer exception

  - by raghs

  this code throws a Null pointer exception. It was thrown by getChildAt(i). The getCount() returns the number of items in listView. But getChildAt(i) returns only if item is present in current list view. For example in a scrollable list view assume that there are 20 items. The getCount() returns 20. But getChildAt(20) returns null. Because it doesnot fit in listview. How to solve this problem?? int i,j=object.getCount(); View v=getListView(); CheckBox chk=null; for(i=0;i<j;i++) { chk=((CheckBox)((ViewGroup) v).getChildAt(i).findViewById(R.id.checkBox1)); if(chk.isChecked()) { //download the contents to specific folder in sd card } }

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• Java - Does null variable require space in memory

  - by Yatendra Goel

  class CheckStore { private String displayText; private boolean state; private String meaningfulText; private URL url; public CheckStore(String text, boolean state) { this.displayText = text; this.state = state; } : : } As I am initializing only two variables (displayText and state) in the constructor, Will the rest two variables (meaningfulText and url which will have the value null) will require space in memory to store null value. Q1. I think they will require space. If they will, then how much memory does a null value takes in the memory (like int takes 4 bytes). Q2. How much space a string takes in memory. I guess it will depend on the length of the string. So how much space a string takes of how much length?

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• null pointer exception on list.add

  - by Eric

  I've been working on this one error for a few hours so I thought I'd pick the brains of some pros. I am getting a null pointer exception at the modelData.add(i, es) method. I know from debugging that es isn't null. I'm really confused, thanks. public class EventTableModel extends AbstractTableModel { //private int rowCount = 0; protected List<EventSeat> modelData; private static final int COLUMN_COUNT = 3; private Event e; Event j = GUIpos.m; int i = 1; public EventTableModel(Event e) { this.e = e; try { System.out.println(modelData); for (EventSeat es : e.getEventSeats()) { modelData.add(i, es); i++; } } catch (DataException ex) { Logger.getLogger(EventTableModel.class.getName()).log(Level.SEVERE, null, ex); } }

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• if specific row = null, execute query

  - by fusion

  how do i check if the value of a column is null, and only then execute the query? for example: col1 col2 col3 01 abc i run a query which first checks if the record exists or not; if it exists, it should execute the update query and if it doesn't exist, it executes the insert query. how do i check if col3 is null and if it is null, it should execute the update query. . $sql = "SELECT uid FROM `users` WHERE uid = '" . $user_id . "'"; $result = mysql_query($sql,$conn) or die('Error:' .mysql_error()); $totalrows = mysql_num_rows($result); if($totalrows < 1) { insertUser($user_id,$sk, $conn); } else { updateSessionKey($user_id,$sk,$conn); }

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• SQL Select between two fields depending on the value of one field

  - by Filip

  Hi. I am using a PostgreSQL database, and in a table representing some measurements I've two columns: measurement, and interpolated. In the first I've the observation (measurement), and b is the interpolated value depending on nearby values. Every record with an original value has also an interpolated value. However, there are a lot of records without "original" observations (NULL), hence the values are interpolated and stored in the second column. So basically there are just two cases in the database: Value Value NULL Value Of course, it is preferable to use the value from the first column if available, hence I need to build a query to select the data from the first column, and if not available (NULL), then the database returns the value from the second column for the record in question. I have no idea how to build the SQL query. Please help. Thanks.

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• GWT : NULL Session

  - by jidma

  I'm using spring4gwt in my project. I have the following login service implementation: @Service("loginService") public class LoginServiceImpl extends RemoteServiceServlet implements LoginService { @Override @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class) public UserBean checkUser(String userName, String password) throws Exception { HttpSession httpSession = getThreadLocalRequest().getSession(); } } When i call the loginService.checkUser("test","test") (In hosted mode), I get a null pointer exception, as getThreadLocalRequest() returns NULL instead of the actual session. I didn't try in web mode yet. Why would I get a null session ? Does it have something to do with spring4gwt ? Thank you

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• Activiti Engine: Task Event - User is null

  - by sockeqwe

  I have a problem, which should be simple to solve, but i can't find the method to call to solve this problem: My problem is, that every Task Event (org.activiti.engine.task.Event) returnes null by calling Event.getUserId(); If I take a look into the database I see that the database table ACT_HI_COMMENT has null as value for the column USER_ID_ for every row. I generate these TaskEvents programmatically by calling (for example) processEngine.getTaskService().addComment(task.getId(), null, commentMessage); processEngine.getTaskService().addUserIdentityLink(task.getId(), user.getId(), IDENTITY_LINK_OBSERVER); I guess there is a simple method that I must call to solve this problem, something like processEngine.setCurrentUser(authenticatedUser.getId()); Any suggestions?

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• C++ - Creating folder method

  - by Matthew

  I have the following method in C++: void create_folder(LPCWSTR full_folder) //Method to create folder in case it does not exist { if(!CreateDirectory(full_folder,attr)) //Checking whether the folder already exists { switch (GetLastError()) { case ERROR_ALREADY_EXISTS: printf("The folder already exists!\n\n"); break; case NULL: printf("The folder does not exist!\n\n"); printf("The folder was created successfully!\n\n"); break; } } } In case the folder already exists, the correct message is displayed on the screen. However, if the folder does NOT exist, nothing is displayed on the screen, that is, the part identified by case NULL is not executed. How can I solve this problem? In other words, how can I get the code after the case NULL to run if the folder does not exist?

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• Handling null values with PowerShell dates

  - by Tim Ferrill

  I'm working on a module to pull data from Oracle into a PowerShell data table, so I can automate some analysis and perform various actions based on the results. Everything seems to be working, and I'm casting columns into specific types based on the column type in Oracle. The problem I'm having has to do with null dates. I can't seem to find a good way to capture that a date column in Oracle has a null value. Is there any way to cast a [datetime] as null or empty?

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• AS3: Performance question calling an event function with null param

  - by adehaas

  Lately I needed to call a listener function without an actual listener like so: foo(null); private function foo(event:Event):void { //do something } So I was wondering if there is a significant difference regarding performance between this and using the following, in which I can prevent the null in calling the function without the listener, but am still able to call it with a listener as well: foo(); private function foo(event:Event = null):void { } I am not sure wether it is just a question of style, or actually bad practice and I should write two similar functions, one with and one without the event param (which seems cumbersome to me). Looking forward to your opinions, thx.

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• mount.nfs: access denied by server while mounting (null), can't find any log information

  - by Mark0978

  Two ubuntu servers: 10.0.8.2 is the client, 192.168.20.58 is the server. Between the 2 machines, Ping works, ssh works (in both directions). From 10.0.8.2 showmount -e 192.168.20.58 Export list for 192.168.20.58: /imr/nfsshares/foobar 10.0.8.2 mount.nfs 192.168.20.58:/imr/nfsshares/foobar /var/data/foobar -v mount.nfs: access denied by server while mounting (null) Found several things online, tried them all and still can't find any log information anywhere. On the server: [email protected]:/var/log# cat /etc/hosts.allow sendmail: all ALL: 10.0.8.2 /etc/hosts.deny is all comments How can I get a trail of log statements to figure this out? What does it take to get some logging so I have some idea of WHY it won't mount? On the server: [email protected]# nmap -sR RPC 192.168.20.58 Starting Nmap 5.21 ( http://nmap.org ) at 2012-07-04 21:16 CDT Failed to resolve given hostname/IP: RPC. Note that you can't use '/mask' AND '1-4,7,100-' style IP ranges Nmap scan report for 192.168.20.58 Host is up (0.0000060s latency). Not shown: 988 closed ports PORT STATE SERVICE VERSION 22/tcp open unknown 80/tcp open unknown 111/tcp open unknown 139/tcp open unknown 445/tcp open unknown 902/tcp open unknown 2049/tcp open unknown 3000/tcp open unknown 5666/tcp open unknown 8009/tcp open unknown 8222/tcp open unknown 8333/tcp open unknown Nmap done: 1 IP address (1 host up) scanned in 3.81 seconds From the client: [email protected]:~$ nmap -sR RPC 192.168.20.58 Starting Nmap 5.21 ( http://nmap.org ) at 2012-07-04 22:14 EDT Failed to resolve given hostname/IP: RPC. Note that you can't use '/mask' AND '1-4,7,100-' style IP ranges Nmap scan report for 192.168.20.58 Host is up (0.73s latency). Not shown: 988 closed ports PORT STATE SERVICE VERSION 22/tcp open unknown 80/tcp open unknown 111/tcp open rpcbind (rpcbind V2) 2 (rpc #100000) 139/tcp open unknown 445/tcp open unknown 902/tcp open unknown 2049/tcp open nfs (nfs V2-4) 2-4 (rpc #100003) 3000/tcp open unknown 5666/tcp open unknown 8009/tcp open unknown 8222/tcp open unknown 8333/tcp open unknown Nmap done: 1 IP address (1 host up) scanned in 191.56 seconds

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• oauth_verifier is not passed using DotNetOpenAuth's Webconsumer

  - by BozoJoe

  I receive back a good oauth_verifier value from the server, but it is not being passed on via the ProcessUserAuthorization call to the access_token endpoint. I'm using DotNetOpenAuth 3.3.1, and the WebConsumer implementation. The server I'm working with is using OAuth 1.0a not 1.0.1. Do I need to force DotNetOpenAuth to use 1.0a? 2010-01-16 13:19:44,343 [5] DEBUG DotNetOpenAuth.Messaging.Channel [(null)] <(null)> - After binding element processing, the received UserAuthorizationResponse (1.0.1) message is: oauth_verifier: dEz9lE9AA1gcdr6oCbmD oauth_token: vauHNVOCITlbGCuqycWn 2010-01-16 13:19:44,346 [5] DEBUG DotNetOpenAuth.Messaging.Channel [(null)] <(null)> - Preparing to send AuthorizedTokenRequest (1.0) message. 2010-01-16 13:19:44,346 [5] DEBUG DotNetOpenAuth.Messaging.Bindings [(null)] <(null)> - Binding element DotNetOpenAuth.OAuth.ChannelElements.OAuthHttpMethodBindingElement applied to message. 2010-01-16 13:19:44,346 [5] DEBUG DotNetOpenAuth.Messaging.Bindings [(null)] <(null)> - Binding element DotNetOpenAuth.Messaging.Bindings.StandardReplayProtectionBindingElement applied to message. 2010-01-16 13:19:44,346 [5] DEBUG DotNetOpenAuth.Messaging.Bindings [(null)] <(null)> - Binding element DotNetOpenAuth.Messaging.Bindings.StandardExpirationBindingElement applied to message. 2010-01-16 13:19:44,346 [5] DEBUG DotNetOpenAuth.Messaging.Channel [(null)] <(null)> - Applying secrets to message to prepare for signing or signature verification. 2010-01-16 13:19:44,348 [5] DEBUG DotNetOpenAuth.Messaging.Bindings [(null)] <(null)> - Signing AuthorizedTokenRequest message using HMAC-SHA1. 2010-01-16 13:19:44,349 [5] DEBUG DotNetOpenAuth.Messaging.Bindings [(null)] <(null)> - Constructed signature base string: GET&http%3A%2F%2Fx-staging.indivo.org%3A8000%2Foauth%2Faccess_token&oauth_consumer_key%3Doak%26oauth_nonce%3DgPersiZV%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1263676784%26oauth_token%3DvauHNVOCITlbGCuqycWn%26oauth_version%3D1.0 2010-01-16 13:19:44,349 [5] DEBUG DotNetOpenAuth.Messaging.Bindings [(null)] <(null)> - Binding element DotNetOpenAuth.OAuth.ChannelElements.SigningBindingElementChain applied to message. 2010-01-16 13:19:44,351 [5] INFO DotNetOpenAuth.Messaging.Channel [(null)] <(null)> - Prepared outgoing AuthorizedTokenRequest (1.0) message for http://x-staging.indivo.org:8000/oauth/access_token: oauth_token: vauHNVOCITlbGCuqycWn oauth_consumer_key: XXXXXXmyComsumerKeyXXXXXX oauth_nonce: gPersiZV oauth_signature_method: HMAC-SHA1 oauth_signature: xNynvr2oFlqtdoOKOl2ETiiTLGY= oauth_version: 1.0 oauth_timestamp: 1263676784 2010-01-16 13:19:44,351 [5] DEBUG DotNetOpenAuth.Messaging.Channel [(null)] <(null)> - Sending AuthorizedTokenRequest request. 2010-01-16 13:19:44,351 [5] DEBUG DotNetOpenAuth.Http [(null)] <(null)> - HTTP GET http://x-staging.indivo.org:8000/oauth/access_token 2010-01-16 13:20:34,657 [5] ERROR DotNetOpenAuth.Http [(null)] <(null)> - WebException from http://x-staging.indivo.org:8000/oauth/access_token: <h4>Internal Server Error</h4> A pastebin link to the log4net log

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