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• Saving objects in servlet session and java.io.NotSerializableException

  - by EugeneP

  SEVERE: IOException while loading persisted sessions: java.io.WriteAbortedException: writi ng aborted; java.io.NotSerializableException: That means this object cannot be persisted on hard disk. Does it imply that it's not safe to keep in Session objects that do not implement "Serializable"? I haven't heard that there are limitations on saving non-serializable objects in Session object. It simply means that Tomcat will always keep them in memory, right?

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• Saving objects in servlet session and java.io.NotSerializableException

  - by EugeneP

  SEVERE: IOException while loading persisted sessions: java.io.WriteAbortedException: writi ng aborted; java.io.NotSerializableException: That means this object cannot be persisted on hard disk. Does it imply that it's not safe to keep in Session objects that do not implement "Serializable"? I haven't heard that there are limitations on saving non-serializable objects in Session object. It simply means that Tomcat will always keep them in memory, right?

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• Constructing an if statement from the client data in python

  - by Vishal

  Hi, I need to construct an if statement from the data coming from the client as below: conditions: condition1, condition2, condition3, condition4 logical operators: lo1, lo2, lo3 (Possible values: "and" "or") Eg. if condition1 lo1 condition2 lo3 condition4: # Do something I can think of eval/exec but not sure how safe they are! Any better approach or alternative? Appreciate your responses :) PS: Client-side: Flex, Server-side: Python, over internet Thanks

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• Clear subversion revision info

  - by RD

  I want to remove all stored revision info, except for the most up to date version (in an effort to safe space). Is this possible?

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• On thread safety in python using D-Bus asynchronous method calls

  - by chatbot

  I write a python class which makes asynchronous method calls using D-Bus. When my reply_handler is called, it stores data in list. This list can be used by another class methods at the same time. Is it safe or I can use only synchronized data structures like Queue class?

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• Prevent Application Shutdown iPhone

  - by Paul Alexander

  I'm building a little dialing program for my kids so that only 4 "safe" numbers are available for them to dial. I'd like to start the app, hand them the phone and have the app be the only thing running until they come back home. Is there a way to keep the application running and prevent the iPhone from shutting down the app?

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• How to sanitize this particular mysql query ?

  - by justjoe

  i got this SQL query where post_title taken from $_GET $sql = "SELECT ID FROM $wpdb-posts WHERE $wpdb-posts.post_title = '5-desain-web-colourful'"; What is the best way to sanitize this and make it more safe ?

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• How to make will_paginate work with liquid

  - by iktorn

  I managed to make a little hack to make will_paginate work with liquid: http://gist.github.com/426737 I wonder if this is safe? Ideas?

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• dao as a member of a servlet - normal?

  - by EugeneP

  I guess, DAO is thread safe, does not use any class members. So can it be used without any problem as a private field of a Servlet ? We need only one copy, and multiple threads can access it simultaneously, so why bother creating a local variable, right?

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• Generics and anonymous type

  - by nettguy

  I understood,normally generics is for compile time safe and allow us to keep strongly typed collection.Then how do generic allow us to store anonymous types like List<object> TestList = new List<object>(); TestList.Add(new { id = 7, Name = "JonSkeet" }); TestList.Add(new { id = 11, Name = "Marc Gravell" }); TestList.Add(new { id = 31, Name = "Jason" });

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• How to change the current selection in a wxListbook from another thread?

  - by George Edison

  How can I change the current selection in a wxListbook from another thread? When I pass the listbook's pointer to the thread and try to change the selection, the app crashes. What is a safe way of doing this? Is there some message I can send to it?

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• Best JSF framework/library for "conversation state"

  - by stacked

  What do people think is the best JSF framework or library for a saving state longer than request scope (but w/o using session scope) that is backbutton/new window safe -- i.e. you have a "wizard"/multi-page form. For example, MyFaces has the 'SaveState' tag (http://bit.ly/8QHmX5) that allows you to maintain state across pages by saving state in the view's component tree. Any comments on SaveState (pros/cons) or suggestions for any better framework or library for this capability?

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• color code in X/HTML , CSS..

  - by jitendra

  In how many ways we can give color info in X/HTML, css? I know some Hex color name rgba is there any other method? and which method is preferred to use and which not? Please give explanation. And what is the means of web-safe colors?

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• Drupal is unable to create the "files" folder (and any upload php script as well)

  - by Patrick

  hi, Drupal cannot create the "files" folder. I tried to upload a php script with mkdir("files",774) but I get a permissions error, so basically any php script is not able to create a folder on the server... What do you suggest ? If I create the folder manually from ftp client and I assign 777 permission everything works perfectly, but it is not safe solution.

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• Is Outlook-friendly HTML code different from code for a conventional web page?

  - by justSteve

  My web-app has to deliver db-generated content by email. The HTML need not include javascript but _does have to include images and CSS. It's a safe bet that most users will be viewing this in Outlook. Are general guidelines different for html destined for email vs. IE?

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• How to set an image based on iphone platform in objective-c

  - by Toran Billups

  I'm moving my application from 3.x to 4.x as I prepare for the app store and found that I need to have 2 copies of all my custom pngs - my question is how can I determine what img to show and when. Example - how do I know to show the Find.png vs the [email protected] Is it "safe" or "correct" to look for 4.x specific apis or does the iphone have a way to determine what platform you are on at runtime? Thank you in advance

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• Thread safety in C# arrays

  - by Betamoo

  Does having 2 different threads : one reading from a C# array (e.g from first location), and another one writing to the same C# array but to a different location(e.g to the last location) is thread safe or not? (And I mean here without locking reading nor writing)

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• Memory Allocation by STL C++ Objects

  - by Vaibhav

  I am using malloc_stats() function to display the amount of "system bytes" and "in use" bytes used by the process. I wanted to know if the in use bytes also include the memory used by STL C++ Objects like map, vector, sets? If yes, is it safe to assume that this is only amount of memory that will be used by the process?

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• How does one Dispose an object that is set in foreach?

  - by Greg Ogle

  foreach(var someDisposableObject in listOfDisposableObjects) { //some code someDisposableObject.Dispose(); //current code contains something like this. } Is there safe way, like a using clause to use in this scenario?

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• nonatomic property in model class when using NSOperationQueue (iPhone)?

  - by Andrew B.

  I have a custom model class with an NSMutableData ivar that will be accessed by custom NSOperation subclasses (using an NSOperationQueue). I think I can guarantee thread-safe access to the ivar from multiple NSOperations by using dependencies, and I can guarantee that I don't access the ivar from other code (say my main app thread) by waiting until the Q has finished all operations. Should I use a nonatomic property specification, or leave it atomic? Is there a significant impact on performance?

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• jQuery uses (new Function("return " + data))(); instead of eval(data); to parse JSON, why?

  - by Luca Matteis

  This link shows you that jQuery uses (new Function("return " + data))(); for older browsers, to parse a JSON string instead of eval(). What are the benefits of this? What if the JSON string isn't safe?

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• Are C++ enums signed or unsigned?

  - by Matt

  Are C++ enums signed or unsigned? And by extension is it safe to validate an input by checking that it is <= your max value, and leave out = your min value (assuming you started at 0 and incremented by 1)?

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• Are cookies enough for storing login data?

  - by jpjp

  I am reading the Head First PHP/Mysql book and they say to store both the user's username, email into cookies and sessions. Is it safe to assume that everyone nowadays accepts cookies? Or should I store both in sessions and cookies? I am not storing any sensitive data in cookies such as password, etc.

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• SQL Server stored procedure in multi threaded environments

  - by Shamika

  Hi, I need to execute some Sql server stored procs in a thread safe manner. At the moment I'm using software locks (C# locks) to achieve this but wonder what kind of features provided by the Sql server itself to achieve thread safety. It seems to be there are some table and row locking features built in to Sql server. Also from a performance perspective what is best approach? Software locks? Or Sql Server built in locks? Thanks, Shamika

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• Program to change/obfuscate all hashes (MD5/SHA1) in a directory tree?

  - by anon

  Hi fellas, A) Are there any FOSS programs out there that can manage to hashchange all files in a directory tree? B) Failing that, what methods could be used to develop this capability in a (crappy) self-written program without requiring the program to be sophisticated and content-aware? Is there any (roughly) universally safe location within a file (for example, around EOF?) where on could one simply append/add psuedorandom data so the resulting hash is different? Is there a better/more elegant solution? Muchos gracias

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