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• Mail server: can't connect via POP/IMAP

  - by MelkerOVan

  I've followed this guide on setting up a mail server on my dedicated server. I've been able to send mails from the php application I'm using and the linux commandline (using telnet, php, etc). The problem is that I cannot connect to the server via IMAP/POP which I've setup using Courier. I've tried using thunderbird but it complains that the username or password is wrong. I doubt it is the username/password but I don't know how to trouble shoot this. Edit: Here's the messages in mail.log: Jan 9 22:43:38 mail authdaemond: received auth request, service=imap, authtype=login Jan 9 22:43:38 mail authdaemond: authmysql: trying this module Jan 9 22:43:38 mail authdaemond: SQL query: SELECT id, crypt, "", uid, gid, home, "", "", name, "" FROM users WHERE id = '[email protected]' AND (enabled=1) Jan 9 22:43:38 mail authdaemond: password matches successfully Jan 9 22:43:38 mail authdaemond: authmysql: sysusername=<null>, sysuserid=5000, sysgroupid=5000, homedir=/var/spool/mail/virtual, [email protected], fullname=peter, maildir=<null>, quota=<null>, options=<null> Jan 9 22:43:38 mail authdaemond: authmysql: clearpasswd=<null>, passwd=password Jan 9 22:43:38 mail authdaemond: Authenticated: sysusername=<null>, sysuserid=5000, sysgroupid=5000, homedir=/var/spool/mail/virtual, [email protected], fullname=peter, maildir=<null>, quota=<null>, options=<null> Jan 9 22:43:38 mail authdaemond: Authenticated: clearpasswd=peter, passwd=password Jan 9 22:43:38 mail imapd: chdir Maildir: No such file or directory

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• Is there a network "tee"-alike with one leg returning to /dev/null ?

  - by Steff Davies

  I've just built a new PostgreSQL server for my employers, which is happily replicating using WALs. I'm now left with the problem of verifying its performance. One nice way which came up in conversation is to break replication with the slave caught up and then direct all production traffic to both servers, discarding the responses from the new server and returning those from the current one to the clients. Once we're sure performance is OK, we re-sync the slave and can fail over with confidence. Bliss. This would require a TCP proxy capable of opening two outgoing connections for each incoming one, and discarding the data returned from one of them, which is a tricky thing to google for, it seems. Do the assembled brains know of such a thing, before I dive into libevent and write one?

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• find . -exec grep -l 'string' {} \; -print 2>/dev/null

  - by 01010101

  it lists all files in "." that contain the string "string" but don't show dirs with permission denied. What would it be the equivalent of that but squeezing xargs in between?

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• Why can't we make CON, PRN,Null folder in windows? [duplicate]

  - by TechnoKnol

  This question already has an answer here: Unable to rename a folder or a file as 'con' 8 answers When i make new folder and rename it to nul it says The Specified device name is invalid. then I searched which are the other folders we can't make, and get names con, nul, prn ? what are these names stands for ? and why can't we make folders with these names ?

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• Mysql: Working With 192 Trillion Records... (Yes, 192 Trillion)

  - by Sarah

  Here's the question... Considering 192 trillion records, what should my considerations be? My main concern is speed. Here's the table... CREATE TABLE `ref` ( `id` INTEGER(13) AUTO_INCREMENT DEFAULT NOT NULL, `rel_id` INTEGER(13) NOT NULL, `p1` INTEGER(13) NOT NULL, `p2` INTEGER(13) DEFAULT NULL, `p3` INTEGER(13) DEFAULT NULL, `s` INTEGER(13) NOT NULL, `p4` INTEGER(13) DEFAULT NULL, `p5` INTEGER(13) DEFAULT NULL, `p6` INTEGER(13) DEFAULT NULL, PRIMARY KEY (`id`), KEY (`s`), KEY (`rel_id`), KEY (`p3`), KEY (`p4`) ); Here's the queries... SELECT id, s FROM ref WHERE red_id="$rel_id" AND p3="$p3" AND p4="$p4" SELECT rel_id, p1, p2, p3, p4, p5, p6 FROM ref WHERE id="$id" INSERT INTO rel (rel_id, p1, p2, p3, s, p4, p5, p6) VALUES ("$rel_id", "$p1", "$p2", "$p3", "$s", "$p4", "$p5", "$p6") Here's some notes... The SELECT's will be done much more frequently than the INSERT. However, occasionally I want to add a few hundred records at a time. Load-wise, there will be nothing for hours then maybe a few thousand queries all at once. Don't think I can normalize any more (need the p values in a combination) The database as a whole is very relational. This will be the largest table by far (next largest is about 900k) UPDATE (08/11/2010) Interestingly, I've been given a second option... Instead of 192 trillion I could store 2.6*10^16 (15 zeros, meaning 26 Quadrillion)... But in this second option I would only need to store one bigint(18) as the index in a table. That's it - just the one column. So I would just be checking for the existence of a value. Occasionally adding records, never deleting them. So that makes me think there must be a better solution then mysql for simply storing numbers... Given this second option, should I take it or stick with the first... [edit] Just got news of some testing that's been done - 100 million rows with this setup returns the query in 0.0004 seconds [/edit]

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• ViewContext.RouteData.Values["action"] is null on server... works fine on local machine

  - by rksprst

  I'm having a weird issue where ViewContext.RouteData.Values["action"] is null on my staging server, but works fine on my dev machine (asp.net development server). The code is simple: public string CheckActiveClass(string actionName) { string text = ""; if (ViewContext.RouteData.Values["action"].ToString() == actionName) { text = "selected"; } return text; } I get the error on the ViewContext.RouteData.Values["action"] line. The error is: Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. Any help is appreciated. Thanks in advance.

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• Why does CLLocationManager returns null locations on the iphone SDK 4 beta in the Simulator?

  - by Rigo Vides

  Hi everyone, I have this piece of code: - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { NSLog(@"Manager did update location!!"); self.currentLocation = newLocation.description; } I have this code inside a class that conforms to the CLLocationManagerDelegate. I tested earlier in sdk 3.0 and works nice (on both simulator and device). I'm testing this class on the SDK 4, in the simulator, but it gives null as a newLocation. I can't even get the NSLog for the first call. I checked other app where I use the location framework and it doesn't work either. I implemented the locationManager:didFailWithError: message also, wich is never called. Can anyone please confirm that the simulator can't do any CLLocationManager capabilities? (a link where the bug is reported as a known issue will be awesome). Is there a way to fix this? Thanks in advance.

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• How to sort by a field that has an alternative value if null in lucene?

  - by citizenmatt

  Hi folks. I want to sort my lucene(.net) search results by a date field (date1), but if date1 is not set, I'd like to use date2. The traditional sort method is to sort by date1, and then sort the values that are the same by date 2. This would mean that whenever I did fall back to date2, these values would be at the top (or bottom) of the result set. I'd like to interleave the date2 values with the date1 values. In other words, I want to sort on (date1 != null ? date1 : date2). Is this possible in lucene? I reckon I could do this in the index creation phase (just put the relevant date value in a new field) but I don't have enough control of the indexing process to be able to do this, so would like a sorting solution. Any ideas? Thanks Matt

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• Java JMS = HornetQ = javax.jms.JMSSecurityException: Unable to validate user: null ?

  - by jens

  Hello Experts, I am trying for several hours to get the HornetQ Examples running in Eclipse. Using the Standalone Examples everything works fine, but when I run the examples in Eclipse I get the following error: javax.jms.JMSSecurityException: Unable to validate user: null What could this error mean? Where do I have to specify the user? Maybe HornetQ tries to look this user up in "Some Context/Properties" etc , but I do not know where and how to specifiy the user HornetQ is running under. What i did: 1.)Started Default HornetQ Server with the start.sh Script in the ./bin directory 2.)Copied the QueueExample over to eclpise 3.)Did some minor changes in the config files (to have the same Queue Names...) (I also tried to disable security completely by setting: <security-enabled>false</security-enabled> but with no success, always getting the same error. Also when trying to programmatically instance HornetQ only via classes I get this error too). Thank you very much!! Jens

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• linq where clause and count result in null exception.

  - by nestling

  The code below works unless p.School.SchoolName turns out to be null, in which case it results in a NullReferenceException. if (ExistingUsers.Where(p => p.StudentID == item.StaffID && p.School.SchoolName == item.SchoolID).Count() > 0) { // Do stuff. } ExistingUsers is a list of users: public List<User> ExistingUsers; Here is the relevant portion of the stacktrace: System.NullReferenceException: Object reference not set to an instance of an object. at System.Linq.Enumerable.WhereListIterator1.MoveNext() at System.Linq.Enumerable.Count[TSource](IEnumerable1 source) How should I handle this where clause? Thanks very much in advance.

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• In javascript, error says 'is null or not an object'. When trying to use .change() code to hide form

  - by codemonkey613

  I'm getting a javascript error. URL: http://bit.ly/dfjvmT It has to do with this section of code: /* * Activate jQuery */ $(document).ready(function() { /* * Show hidden field when 'Other' selected from dropdown */ $.listHidden = { '6' : $('.referrer_other') }; $('#referrer_select').change(function() { // hide all $.each($.listHidden, function() { this.hide(); }); // show current $.listHidden[$(this).val()].slideDown(250); }).change(); }); The code works like this. The form has a dropdown asking "How did you find us?" If the user selects 'other', which is an <option> with value=6, a text input field .referrer_other becomes visible. Javascript is currently reporting that: '$.listHidden[...] is null or not an object'. It's an error that appears in IE. I found this code on the internet somewhere. Is there a way to fix it, or should I look for something else? Thanks

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• Reading XML using XDocument & Linq - check if element is NULL?

  - by adchased

  I'm using LINQ together with XDocument to read a XML File. This is the code: XDocument xml = XDocument.Load(filename); var q = from b in xml.Descendants("product") select new { name = b.Element("name").Value, price = b.Element("price").Value, extra = b.Element("extra1").Value, deeplink = b.Element("deepLink").Value }; Now the problem is, the extra1 field is not always present. There are items in the XML file without that node. If that happens it's crashing with a NullReferenceException. Is there any possibility to include a "check if null" so I can prevent it from crashing?

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• [jQuery] JSON response is null, but the URL is echoing correctly.

  - by b. e. hollenbeck

  I have a form being AJAX'd in by jQuery on a page with multiple forms. I'm performing the following function, which is a wrapper for the $.ajax function: function do_json_get(uri){ var ret = ''; var url = AJAX_URL + uri; $.ajax({ type: 'GET', url: url, async: false, success: function(data) { ret = data.html; }, dataType: 'json' }); return ret; } When I go to the AJAX server directly (which is rendering the form in PHP), I get the raw JSON response - so I know the server is outputting to the browser, and the AJAX server is doing other things like setting the proper cookies, so I know that the connection is good (I get a 200 response code). Yet the data object is coming back null. What else could I be missing?

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• Hibernate cascading: should setting to null on a parent delete children?

  - by EugeneP

  I wonder if Hib works as expected in my case? My Cascading options are set to "all,delete-orphan". Table_A @OneToOne Table_B Table_B @OneToMany Table_C Now it looks like Table_A . getTable_B . getTable_C_Collection() Suppose there are elements in Table_C collection. What I expect from Hibernate: if I set Table_B link to null, then all Table_C collection elements MUST BE DELETED. It does not happen. They become ORPHANED !

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• NHibernate AssertException: Interceptor.OnPrepareStatement(SqlString) returned null or empty SqlString.

  - by jwynveen

  I am trying to switch a table from being a many-to-one mapping to being many-to-many with an intermediate mapping table. However, when I switched it over and tried to do a query on it with NHibernate, it's giving me this error: "Interceptor.OnPrepareStatement(SqlString) returned null or empty SqlString." My query was originally something more complex, but I switched it to a basic fetch all and I'm still having the problem: Session.QueryOver<T>().Future(); It would seem to either be a problem in my model mapping files or something in my database. Here are my model mappings: <?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="GBI.Core" namespace="GBI.Core.Models"> <class name="Market" table="gbi_Market"> <id name="Id" column="MarketId"> <generator class="identity" /> </id> <property name="Name" /> <property name="Url" /> <property name="Description" type="StringClob" /> <property name="Rating" /> <property name="RatingComment" /> <property name="RatingCommentedOn" /> <many-to-one name="RatingCommentedBy" column="RatingCommentedBy" lazy="proxy"></many-to-one> <property name="ImageFilename" /> <property name="CreatedOn" /> <property name="ModifiedOn" /> <property name="IsDeleted" /> <many-to-one name="CreatedBy" column="CreatedBy" lazy="proxy"></many-to-one> <many-to-one name="ModifiedBy" column="ModifiedBy" lazy="proxy"></many-to-one> <set name="Content" where="IsDeleted=0 and ParentContentId is NULL" order-by="Ordering asc, CreatedOn asc, Name asc" lazy="extra"> <key column="MarketId" /> <one-to-many class="MarketContent" /> </set> <set name="FastFacts" where="IsDeleted=0" order-by="Ordering asc, CreatedOn asc, Name asc" lazy="extra"> <key column="MarketId" /> <one-to-many class="MarketFastFact" /> </set> <set name="NewsItems" table="gbi_NewsItem_Market_Map" lazy="true"> <key column="MarketId" /> <many-to-many class="NewsItem" fetch="join" column="NewsItemId" where="IsDeleted=0"/> </set> <!--<set name="MarketUpdates" table="gbi_Market_MarketUpdate_Map" lazy="extra"> <key column="MarketId" /> <many-to-many class="MarketUpdate" fetch="join" column="MarketUpdateId" where="IsDeleted=0" order-by="CreatedOn desc" /> </set>--> <set name="Documents" table="gbi_Market_Document_Map" lazy="true"> <key column="MarketId" /> <many-to-many class="Document" fetch="join" column="DocumentId" where="IsDeleted=0"/> </set> </class> <?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="GBI.Core" namespace="GBI.Core.Models"> <class name="MarketUpdate" table="gbi_MarketUpdate"> <id name="Id" column="MarketUpdateId"> <generator class="identity" /> </id> <property name="Description" /> <property name="CreatedOn" /> <property name="ModifiedOn" /> <property name="IsDeleted" /> <!--<many-to-one name="Market" column="MarketId" lazy="proxy"></many-to-one>--> <set name="Comments" where="IsDeleted=0" order-by="CreatedOn desc" lazy="extra"> <key column="MarketUpdateId" /> <one-to-many class="MarketUpdateComment" /> </set> <many-to-one name="CreatedBy" column="CreatedBy" lazy="proxy"></many-to-one> <many-to-one name="ModifiedBy" column="ModifiedBy" lazy="proxy"></many-to-one> </class> <?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="GBI.Core" namespace="GBI.Core.Models"> <class name="MarketUpdateMarketMap" table="gbi_Market_MarketUpdate_Map"> <id name="Id" column="MarketUpdateMarketMapId"> <generator class="identity" /> </id> <property name="CreatedOn" /> <property name="ModifiedOn" /> <property name="IsDeleted" /> <many-to-one name="CreatedBy" column="CreatedBy" lazy="proxy"></many-to-one> <many-to-one name="ModifiedBy" column="ModifiedBy" lazy="proxy"></many-to-one> <many-to-one name="MarketUpdate" column="MarketUpdateId" lazy="proxy"></many-to-one> <many-to-one name="Market" column="MarketId" lazy="proxy"></many-to-one> </class> As I mentioned, MarketUpdate was originally a many-to-one with Market (MarketId column is still in there, but I'm ignoring it. Could this be a problem?). But I've added in the Market_MarketUpdate_Map table to make it a many-to-many. I'm running in circles trying to figure out what this could be. I couldn't find any reference to this error when searching. And it doesn't provide much detail. Using: NHibernate 2.2 .NET 4.0 SQL Server 2005

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• How does the method overload resolution system decide which method to call when a null value is passed?

  - by Joan Venge

  So for instance you have a type like: public class EffectOptions { public EffectOptions ( params object [ ] options ) {} public EffectOptions ( IEnumerable<object> options ) {} public EffectOptions ( string name ) {} public EffectOptions ( object owner ) {} public EffectOptions ( int count ) {} public EffectOptions ( Point point ) {} } Here I just give the example using constructors but the result will be the same if they were non-constructor methods on the type itself, right? So when you do: EffectOptions options = new EffectOptions (null); which constructor would be called, and why? I could test this myself but I want to understand how the overload resolution system works (not sure if that's what it's called).

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• Facebook writing on a wall problem - retrieves only null value.

  - by Viral

  hi all friends, I am making a game application in that I want to pass my score on wall of face book. I've completed all the things (the log in and message passing part) but when I passes the score via global variable, I am getting only null as a value and not the score that I want. Is there any way to pass data or string to Face book and write on a wall? My code is (void)viewDidLoad { static NSString* kApiKey = @"be60415be308e2b44c0ac1db83fe486b"; static NSString* kApiSecret = @"4f880c7e100321f808c41b1d3c813dfa"; _session = [[FBSession sessionForApplication:kApiKey secret:kApiSecret delegate:self] retain]; score = [NSString stringWithFormat:@"%@",appDelegate.myTextView]; [_session resume]; [super viewDidLoad]; } whre score is NSString and myTextView is NSString in other viewcontrollerfile, And appDelegate is global variable. Any help?? thanks in advance.

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• LINQ - Select Statement - The null value cannot be assigned to a member with type System.Int32 which

  - by thiag0

  I am trying to achieve the following... _4S.NJB_Request request = (from r in db.NJB_Requests where r.RequestId == referenceId select r).Take(1).SingleOrDefault(); Getting the following exception... Message: The null value cannot be assigned to a member with type System.Int32 which is a non-nullable value type. StackTrace: at System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult) at System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries) at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) at System.Data.Linq.DataQuery`1.System.Linq.IQueryProvider.Execute[S](Expression expression) at System.Linq.Queryable.SingleOrDefault[TSource](IQueryable`1 source) at DAL.SqlDataProvider.MarkNJBPCRequestAsComplete(Int32 referenceId, Int32 processState) I have verified that 'referenceId' does have a value. Anyone know why this would happen in a select statement? Thanks!

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• Databinding in windows forms on an object graph with possible null properties?

  - by Fredrik

  If I have an object graph like this: class Company { public Address MainAddress {...} } class Address { public string City { ... } } Company c = new Company(); c.MainAddress = new Address(); c.MainAddress.City = "Stockholm"; and databind to a control using: textBox1.DataBinding.Add( "Text", c, "MainAddress.City" ); Everything is fine, but If I bind to: Company c2 = new Company(); c2 using the same syntax it crashes since the MainAddress property is null. I wonder if there is a custom Binding class that can set up listeners for all the possible paths here and bind to the actual object dynamically when/if I sometime later in the application set the MainAddress property.

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• How to get null when use head funtion with a empty list in cypher?

  - by PeaceMaker

  I have a cypher query like this. START dep=node:cities(city_code = "JGS"), arr=node:cities(city_code = "XMN") MATCH dep-[way:BRANCH2BRANCH_AIRWAY*0..1]->()-->arr RETURN length(way), transfer.city_code, extract(w in way: w.min_consume_time) AS consumeTime The relationship named "way" is a optional one, so the property named "consumeTime" will be a empty list when the relationship "way" not exsit. The query result is: | 0 | "JGS" | [] | | 1 | "SZX" | [3600] | When I want to use the head function with the property "consumeTime", it return a error "Invalid query: head of empty list". How can I get a result like this? | 0 | "JGS" | null | | 1 | "SZX" | 3600 |

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• Should I make sure arguments aren't null before using them in a function.

  - by Nathan W

  The title may not really explain what I'm really trying to get at, couldn't really think of a way to describe what I mean. I was wondering if it is good practice to check the arguments that a function accepts for nulls or empty before using them. I have this function which just wraps some hash creation like so. Public Shared Function GenerateHash(ByVal FilePath As IO.FileInfo) As String If (FilePath Is Nothing) Then Throw New ArgumentNullException("FilePath") End If Dim _sha As New Security.Cryptography.MD5CryptoServiceProvider Dim _Hash = Convert.ToBase64String(_sha.ComputeHash(New IO.FileStream(FilePath.FullName, IO.FileMode.Open, IO.FileAccess.Read))) Return _Hash End Function As you can see I just takes a IO.Fileinfo as an argument, at the start of the function I am checking to make sure that it is not nothing. I'm wondering is this good practice or should I just let it get to the actual hasher and then throw the exception because it is null.? Thanks.

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• How do I add values in an array when there is a null entry?

  - by Angela

  I want to create a real time-series array. Currently, I am using the statistics gem to pull out values for each 'day': define_statistic :sent_count, :count => :all, :group => 'DATE(date_sent)', :filter_on => {:email_id => 'email_id > = ?'}, :order => 'DATE(date_sent) ASC' What this does is create an array where there are values for a date, for example [["12-20-2010",1], ["12-24-2010",3]] But I need it to fill in the null values, so it looks more like: [["12-20-2010",1], ["12-21-2010",0], ["12-22-2010",0], ["12-23-2010",0], ["12-24-2010",3]] Notice how the second example has "0" values for the days that were missing from the first array.

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• Mvc3 IEnumerable<QuestionModel> have a List<QuestionOptionModel> property. When I post, I get null list

  - by user1649439

  There is a example here. I am trying to use this technique in a large form with a list(List) but when I post back, the Viewmodel.Order that should’ve contained list of items and activities return with the lists empty. My QuestionModel.cs like this. public int Id { get; set; } public string QuestionText { get; set; } public System.Nullable<bool> OptionType1 { get; set; } public System.Nullable<bool> OptionType2 { get; set; } public List<QuestionOptionModel> OptionList = new List<QuestionOptionModel>(); When I post back "IEnumerable questions" List OptionList comes null. How can I do this?

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• MySQL sorting: NULL to the end & use index? Not possible?

  - by Vojto

  Hello fellow experts, I have a huge table and I want simple sorting. It could be so easy. I could just create an index and do some really fast sorting thanks to that index. But my client wants to put NULLs to the end, which is complicates the whole situation. Instead of simple: SORT BY name ASC I have to do SORT BY name IS NULL ASC, name ASC. That would be ok, but it because of that my index is useless, and the sorting is very slow. I don't know if there's a way to solve this problem, but if there is one, I desperately ask for help. :'(

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• How to return null value if the query has no corresponding value?

  - by Holicreature

  Hi i've a query select c.name as companyname, u.name,u.email,u.role,a.date from useraccount u, company c, audittrial a where u.status='active' and u.companyid=c.id and (u.companyid=a.companyID and a.activity like 'User activated%' and a.email=u.email) order by u.companyid desc limit 10 So if the following part doesnt't satisfy, (u.companyid=a.companyID and a.activity like 'User activated%' and a.email=u.email) no rows will be returned.. but i want to return the result of the following query select c.name as companyname, u.name,u.email,u.role,a.date from useraccount u, company c, audittrial a where u.status='active' and u.companyid=c.id order by u.companyid desc limit 10 but to add that, i should return the date if available and return null value if date is not available.. how can i do this?

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