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  • Security when using GWT RPC

    - by gerdemb
    I have an POJO in Google Web Toolkit like this that I can retrieve from the server. class Person implements Serializable { String name; Date creationDate; } When the client makes changes, I save it back to the server using the GWT RemoteServiceServlet like this: rpcService.saveObject(myPerson,...) The problem is that the user shouldn't be able to change the creationDate. Since the RPC method is really just a HTTP POST to the server, it would be possible to modify the creationDate by changing the POST request. A simple solution would be to create a series of RPC functions like changeName(String newName), etc., but with a class with many fields would require many methods for each field, and would be inefficient to change many fields at once. I like the simplicity of having a single POJO that I can use on both the server and GWT client, but need a way to do it securely. Any ideas?

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  • How to find a duplicate element in an array of shuffled consecutive integers?

    - by SysAdmin
    I recently came across a question somewhere Suppose you have an array of 1001 integers. The integers are in random order, but you know each of the integers is between 1 and 1000 (inclusive). In addition, each number appears only once in the array, except for one number, which occurs twice. Assume that you can access each element of the array only once. Describe an algorithm to find the repeated number. If you used auxiliary storage in your algorithm, can you find an algorithm that does not require it? what i am interested to know is the second part. i.e without using auxiliary storage . do you have any idea?

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  • jQuery selector help - Can I generate a selector from clicking on an element?

    - by Kettenbach
    Hi All, I have jQuery, FireFox, Firebug, IE, and IE developer toolbar. When I am examing a page with either FireBug or IE Dev toolbar, I am able to click on an element and it shows me in the dom where the element is etc... Is there anyway to transform that selection into a valid jQuery selector? I know I can use ID, classes, and element relative to other elements etc... but what about when I am looking at some random table cell that doesn't have a class or id etc.. Can I generate a selector on the fly like that? I thought for sure there was. Any thoughts or ideas are always appreciated Thanks, ~ck in San Diego

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  • Regular Expression Help - Brackets within brackets

    - by adbox
    Hello I'm trying to develop a function that can sort through a string that looks like this: Donny went to the {park|store|{beach with friends|beach alone}} so he could get a breath of freash air. What I intend to do is search the text recursively for {} patterns where there is no { or } inside the {}, so only the innermost sandwiched text is selected, where I will then run a php to array the contents and select one at random, repeating process until the whole string has been parsed, showing a complete sentence. I just cannot wrap my head around regular expressions though. Appreciate any help!

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  • Variable declarations following if statements

    - by Anthony Pegram
    An issue came up on another forum and I knew how to fix it, but it revealed a feature of the compiler peculiar to me. The person was getting the error "Embedded statement cannot be a declaration or labeled statement" because they had a declaration of a variable following an if statement with no brackets. That was not their intent, but they had commented out the line of code immediately following the if statement, which made the variable declaration the de facto line of code to execute. Anyway, that's the background, which brings me to this. The following code is illegal if (true) int i = 7; However, if you wrap that in brackets, it's all legal. if (true) { int i - 7; } Neither piece of code is useful. Yet the second one is OK. What specifically is the explanation for this behavior? I have a hypothesis, but I'd rather ask the brilliant people on stackoverflow.

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  • SSIS - Parallel Execution of Tasks - How efficient is it?

    - by Randy Minder
    I am building an SSIS package that will contain dozens of Sequence tasks. Each Sequence task will contain three tasks. One to truncate a destination table and remove indexes on the table, another to import data from a source table, and a third to add back indexes to the destination table. My question is this. I currently have nine of these Sequences tasks built, and none are dependent on any of the others. When I execute the package, SSIS seems to do a pretty good job of determining which tasks in which Sequence to execute, which, by the way, appears to be quite random. As I continue adding more Sequences, should I attempt to be smarter about how SSIS should execute these Sequences, or is SSIS smart enough to do it itself? Thanks.

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  • How do i make my google web app searchable on google?

    - by LoudNPossiblyRight
    I have started to develop a web app on google's app engine and i wish to make the static content on the site searchable on google. For example, my app is at http://ajakimov.appspot.com/ and on it there is only some random text like 'form bell road smear sky orange fan glass key'. When i google for 'form bell road smear' for example or the title of the site for that matter , i get no results - cant find the site. Does anyone know how to make a appengine site google-able? Thanks.

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  • mmap() for large file I/O?

    - by Boatzart
    I'm creating a utility in C++ to be run on Linux which can convert videos to a proprietary format. The video frames are very large (up to 16 megapixels), and we need to be able to seek directly to exact frame numbers, so our file format uses libz to compress each frame individually, and append the compressed data onto a file. Once all frames are finished being written, a journal which includes meta data for each frame (including their file offsets and sizes) is written to the end of the file. I'm currently using ifstream and ofstream to do the file i/o, but I am looking to optimize as much as possible. I've heard that mmap() can increase performance in a lot of cases, and I'm wondering if mine is one of them. Our files will be in the tens to hundreds of gigabytes, and although writing will always be done sequentially, random access reads should be done in constant time. Any thoughts as to whether I should investigate this further, and if so does anyone have any tips for things to look out for? Thanks!

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  • How to debug a corrupt pdf file?

    - by Joelio
    Hi, im generating pdf files using a ruby library called "prawn". I have one particular file that seems to be considered "Corrupt" by adobe reader. It shows up fine in both preview and in adobe reader. It gives errors like: Sometimes I get: "Could not find the XObject named '%s'. Othertimes I get: "Could not find the XObject named "Im4". Then always I get: "An error exists on this page. Acrobat may not display the page correctly. Please contact the person who created the PDF document to correct the problem." Is there a way to open a pdf with some tool and have it tell you what is technically wrong with the pdf? Im sure I could figure it out quickly with something like this... thanks Joel

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  • Error during maven build: "[java] Timestamp response not valid"

    - by fei
    My maven build started failing randomly, and it got the following error which I cannot make sense of, and googling it doesn't give me anything useful: [echo] Creating a full package... [java] Timestamp response not valid [INFO] ------------------------------------------------------------------------ [ERROR] BUILD ERROR [INFO] ------------------------------------------------------------------------ [INFO] Failed to execute: Executing Ant script: /airtest.build.xml [package-admin-air]: Failed to execute. Java returned: 10 This is a random error that pops up in various point during the build process, and sometimes the build will succeed and then the next one will fail again. This is really weird, does anyone seen this before? I'm using maven 2.2.1 BTW, the error return code 10 in windows mean "Environment is invalid.:

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  • PHP - HTML Purifier - hello w<o>rld/world tutorial striptags

    - by JW
    I am just looking into using HTML Purifier to ensure that a user-inputed string (that represents the name of a person) is sanitized. I do not want to allow any html tags, script, markup etc - I just want the alpha, numeric and normal punctuation characters. The sheer number of options available for HTML Purifier is daunting and, as far as i can see, the docs do not seem to have a beggining/middle or end see: http://htmlpurifier.org/docs Is there a simple hello world tutorial online that shows how to sanitize a string removing all the bad stuff out of it. I am also considering just using strip tags: http://php.net/manual/en/function.strip-tags.php or PHP's in built data sanitizing http://us.php.net/manual/en/book.filter.php

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  • How to trigger a postback using JQuery Droppable plugin ?

    - by Sandeep K Ram
    Hi, This is my script for the draggable and droppable <script type="text/javascript"> $(function() { $(".Source li").draggable({ appendTo: "body", helper: "clone", revert: "invalid" }); $(".Destination ").droppable({ activeClass: "ui-state-default", hoverClass: "ui-state-hover", accept: ".Source li", drop: function(event, ui) { $(this).find(".placeholder").remove(); $("#Hf1").val(ui.draggable.text()); $("#TxtItemId").val($("#Hf1").val()); } }); }); </script> Now I want to access the value of the "TxtItemId" control in the code-behind through a postback. How do I go about doing this ? BTW, this is for a scenario where a person will drag an item from a panel into a shopping cart and I need to capture the Id of the dropped item and trigger a postback after the drop to update the quantity of that item in the cart.

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  • XSLT good choice for web framework?

    - by Xepoch
    I've always thought of XML (and SGML before that) data as the devil's format. I'm of the old database and flat files school. Nonetheless, we are developing a commercially-available web product who's framework is based off of translating/transforming XML data in chains. As we're interviewing for positions as well talking to potential customers, they love the concept of what it will do but are weary of supporting XSLT long-term. One person even called it the proverbial "dead." Dead like COBOL, Unix, and C or dead like Apple Business BASIC? Anyway, I'm curious if building a web framework on XSLT is really not cutting edge enough (oddly) for companies. Are there inherent XSLT implementation problems that make this venture something worth reconsidering?

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  • sql locking on silverlight app

    - by immuner
    Hi, i am not sure if this is the correct term, but this is what id like to do: I have an application that uses a mssql database. This application can operate in 3 modes. mode 1) user does not alter, but only read the database mode 2) user can add rows (one at a time) onto a table in the database mode 3) user can alter several tables in the database (one person at a time) question 1) how can i ensure that when a user in in mode 3 that the database will "lock" and all logged in users who operate in mode 2 or mode 3 will not be able to change the database until he finishes? question 2) how can i ensure that while there are several users in mode 2, that there will be no conflict while they all update the table? my guess here, is that before adding a new row, you make a server query for the table's current unique keys and add the new entry. will this be safe enough though? Thanks

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  • Can a binary tree or tree be always represented in a Database as 1 table and self-referencing?

    - by Jian Lin
    I didn't feel this rule before, but it seems that a binary tree or any tree (each node can have many children but children cannot point back to any parent), then this data structure can be represented as 1 table in a database, with each row having an ID for itself and a parentID that points back to the parent node. That is in fact the classical Employee - Manager diagram: one boss can have many people under him... and each person can have n people under him, etc. This is a tree structure and is represented in database books as a common example as a single table Employee.

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  • ListView in ArrayAdapter order get's mixed up when scrolling

    - by Dan B
    Hi, I have a ListView in a custom ArrayAdapter that displays an icon ImageView and a TextView in each row. When I make the list long enough to let you scroll through it, the order starts out right, but when I start to scroll down, some of the earlier entries start re-appearing. If I scroll back up, the old order changes. Doing this repeatedly eventually causes the entire list order to be seemingly random. So scrolling the list is either causing the child order to change, or the drawing is not refreshing correctly. What could cause something like this to happen? I need the order the items are displayed to the user to be the same order they are added to the ArrayList, or at LEAST to remain in one static order. If I need to provide more detailed information, please let me know. Any help is appreciated. Thanks.

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  • Handling log-in / log-out via Objective-c

    - by squeezemylime
    Having a real problem with this one...Tried using cookies to store variables, etc. but no luck. Writing an iPhone app where the User has to log in. There is an HTTPS call to get the person's userid, which is used practically everywhere else in the app, so that either has to be stored in a global variable or a cookie (for sending messages to other users, etc.) I tried the cookie route, but am having great difficulty storing (and retriving) a user ID in a cookie. The User should be able to then close out of the app and then reboot it and have the app retain their User ID as well, so I'm not sure global variables are necessarily the solution to this. Are there any best practices or suggestions?

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  • Question about tracking user in a map application using cellid

    - by subh
    I am trying to understand the concept of cellid (http://www.opencellid.org/api) As per that, if we send a request http://www.opencellid.org/cell/get?key=myapikey&mnc=1&mcc=2&lac=200&cellid=234 it will respond with the latitude and longitude. I was wondering if this can be used from within a google map application for tracking a user or it needs to be used from within a mobile device? If it can be used from within a web app, what parameters should it use for mcc: mobile country code (decimal) mnc: mobile network code (decimal) lac: locale area code (decimal) cellid: value of the cell id E.g., will it work if we know the cell number of the person(e.g., 281 222 6700)

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  • Python PyQT4 - Adding an unknown number of QComboBox widgets to QGridLayout

    - by ZZ
    Hi all, I want to retrieve a list of people's names from a queue and, for each person, place a checkbox with their name to a QGridLayout using the addWidget() function. I can successfully place the items in a QListView, but they just write over the top of each other rather than creating a new row. Does anyone have any thoughts on how I could fix this? self.chk_People = QtGui.QListView() items = self.jobQueue.getPeopleOffQueue() for item in items: QtGui.QCheckBox('%s' % item, self.chk_People) self.jobQueue.getPeopleOffQueue() would return something like ['Bob', 'Sally', 'Jimmy'] if that helps.

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  • draw csv file data as a heatmap using numpy and matplotlib

    - by Schrodinger's Cat
    Hello all, I was able to load my csv file into a numpy array: data = np.genfromtxt('csv_file', dtype=None, delimiter=',') Now I would like to generate a heatmap. I have 19 categories from 11 samples, along these lines: cat,1,2,3... a,0.0,0.2,0.3 b,1.0,0.4,0.2 . . . I wanted to use matplotlib colormesh. but I'm at loss. all the examples I could find used random number arrays. any help and insights would be greatly appreciated. many thanks

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  • Can managed and unmanaged C++/MFC be mixed in one dll?

    - by Walter Williams
    Previously we had software in MFC (VC6), VB6 and C# applications that needed to call the same engine written in C++ (and MFC). The engine required C++ for speed. At the time we decided to use COM as the interface because all three could use it with the least issues in marshalling, etc. Our MFC application is now deprecated and we have recently decided to dump VB6, so what we've got left is C#. We can just leave the COM engine as-is, but it would be nice to get away from COM registration, etc., and have a managed interface to work with. COM registration occasionally causes support issues if there is something wrong with the person's machine. Is it possible to have a dll with the existing unmanaged C++/MFC, and a .NET front end interface?

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  • asp.net Dynamic Data Site with custom own MetaData

    - by loviji
    Hello, I'm searching info about configuring own MetaData in asp.NET Dynamic Site. For example. I have a table in MS Sql Server with structure shown below: CREATE TABLE [dbo].[someTable]( [id] [int] NOT NULL, [pname] [nvarchar](20) NULL, [FullName] [nvarchar](50) NULL, [age] [int] NULL) and I there are 2 Ms Sql tables (I've created), sysTables and sysColumns. sysTables: ID sysTableName TableName TableDescription 1 | someTable |Persons |All Data about Persons in system sysColumns: ID TableName sysColumnName ColumnName ColumnDesc ColumnType MUnit 1 |someTable | sometable_pname| Name | Persona Name(ex. John)| nvarchar(20) | null 2 |someTable | sometable_Fullname| Full Name | Persona Name(ex. John Black)| nvarchar(50) | null 3 |someTable | sometable_age| age | Person age| int | null I want that, in Details/Edit/Insert/List/ListDetails pages use as MetaData sysColumns and sysTableData. Because, for ex. in DetailsPage fullName, it is not beatiful as Full Name . someIdea, is it possible? thanks

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  • Fluent NHibernate/SQL Server 2008 insert query problem

    - by Mark
    Hi all, I'm new to Fluent NHibernate and I'm running into a problem. I have a mapping defined as follows: public PersonMapping() { Id(p => p.Id).GeneratedBy.HiLo("1000"); Map(p => p.FirstName).Not.Nullable().Length(50); Map(p => p.MiddleInitial).Nullable().Length(1); Map(p => p.LastName).Not.Nullable().Length(50); Map(p => p.Suffix).Nullable().Length(3); Map(p => p.SSN).Nullable().Length(11); Map(p => p.BirthDate).Nullable(); Map(p => p.CellPhone).Nullable().Length(12); Map(p => p.HomePhone).Nullable().Length(12); Map(p => p.WorkPhone).Nullable().Length(12); Map(p => p.OtherPhone).Nullable().Length(12); Map(p => p.EmailAddress).Nullable().Length(50); Map(p => p.DriversLicenseNumber).Nullable().Length(50); Component<Address>(p => p.CurrentAddress, m => { m.Map(p => p.Line1, "Line1").Length(50); m.Map(p => p.Line2, "Line2").Length(50); m.Map(p => p.City, "City").Length(50); m.Map(p => p.State, "State").Length(50); m.Map(p => p.Zip, "Zip").Length(2); }); Map(p => p.EyeColor).Nullable().Length(3); Map(p => p.HairColor).Nullable().Length(3); Map(p => p.Gender).Nullable().Length(1); Map(p => p.Height).Nullable(); Map(p => p.Weight).Nullable(); Map(p => p.Race).Nullable().Length(1); Map(p => p.SkinTone).Nullable().Length(3); HasMany(p => p.PriorAddresses).Cascade.All(); } public PreviousAddressMapping() { Table("PriorAddress"); Id(p => p.Id).GeneratedBy.HiLo("1000"); Map(p => p.EndEffectiveDate).Not.Nullable(); Component<Address>(p => p.Address, m => { m.Map(p => p.Line1, "Line1").Length(50); m.Map(p => p.Line2, "Line2").Length(50); m.Map(p => p.City, "City").Length(50); m.Map(p => p.State, "State").Length(50); m.Map(p => p.Zip, "Zip").Length(2); }); } My test is [Test] public void can_correctly_map_Person_with_Addresses() { var myPerson = new Person("Jane", "", "Doe"); var priorAddresses = new[] { new PreviousAddress(ObjectMother.GetAddress1(), DateTime.Parse("05/13/2010")), new PreviousAddress(ObjectMother.GetAddress2(), DateTime.Parse("05/20/2010")) }; new PersistenceSpecification<Person>(Session) .CheckProperty(c => c.FirstName, myPerson.FirstName) .CheckProperty(c => c.LastName, myPerson.LastName) .CheckProperty(c => c.MiddleInitial, myPerson.MiddleInitial) .CheckList(c => c.PriorAddresses, priorAddresses) .VerifyTheMappings(); } GetAddress1() (yeah, horrible name) has Line2 == null The tables seem to be created correctly in sql server 2008, but the test fails with a SQLException "String or binary data would be truncated." When I grab the sql statement in SQL Profiler, I get exec sp_executesql N'INSERT INTO PriorAddress (Line1, Line2, City, State, Zip, EndEffectiveDate, Id) VALUES (@p0, @p1, @p2, @p3, @p4, @p5, @p6)',N'@p0 nvarchar(18),@p1 nvarchar(4000),@p2 nvarchar(10),@p3 nvarchar(2),@p4 nvarchar(5),@p5 datetime,@p6 int',@p0=N'6789 Somewhere Rd.',@p1=NULL,@p2=N'Hot Coffee',@p3=N'MS',@p4=N'09876',@p5='2010-05-13 00:00:00',@p6=1001 Notice the @p1 parameter is being set to nvarchar(4000) and being passed a NULL value. Why is it setting the parameter to nvarchar(4000)? How can I fix it? Thanks!

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  • What *collaborative* wireframing / UI mockup tools are out there?

    - by taco
    I'm looking for something that applies the collaboration focus (one location/URL, always up-to-date, multi-person online read/write access anywhere) of google docs / google spreadsheets to wireframing. Bonus points if, like Google Docs, it needs only a browser yet also works offline. More bonus points if it supports automatic revisions. Even more bonus points if you can hand out login-less 'invitation' URLs like Flickr does, instead of forcing people into signing up for accounts or using their home accounts. To start off, there's one called iPlotz, but it didn't enchant me -- ironically, mostly because of its akward UI, which can't hold a candle to omnigraffle (don't let that prevent you from giving it a try though). And no, paper prototyping, wonderful as it is, does not qualify: it does not combine being instantly globally shareable & editable very well :-)

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  • Linking Excel and Access

    - by Mel
    I run a sports program where i have a master roll of who is in which class in excel. I want to link this to a database in access that stores the other information about each athlete, e.g. address, parents name, school, medical details. I want to be able to add names to class in the excel speadsheet and have this automatically generate a record for that person in access. There also needs to be some failsafe for athletes that are in multiple classes. I was also doing class roles as pivot tables out of the access database so i need to code for classes and also have this allow for athletes in multiple classes/disciplines.

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