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Grails and PermGen issue with g:link and g:render

- by Alexi Groove

I've been running grails for sometime without any issues but recently after an upgrade to Grails 1.1.1, I've encountered the dreaded PermGen errors. Prior to the upgrade, no such issue. The error seems to be happening when the <g:link> and <g:render> tags are used in a GSP although I'm not sure it's indicative that this is the issue but more of the fact that it ran out of space when these tags were being rendered. Typically, everyone who encounters PermGen errors recommend increasing your java environment options -- but what maybe the source of the issue? Is it a Grails 1.1/hibernate/spring problem? The error: 2010-04-20 05:37:03,962 INFO [STDOUT] 05:37:03,961 ERROR [GroovyPagesServlet] Error processing GSP: Error executing tag <g:render>: org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException: Error executing tag <g:link>: java.lang.OutOfMemoryError: PermGen space org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException: Error executing tag <g:render>: org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException: Error executing tag <g:link>: java.lang.OutOfMemoryError: PermGen space

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Verify my form workflow

- by Shackrock

I have a form, with some sensitive info (CC numbers). My work flow is: One page to take all form items Upon submission, values are validated. If all is well, all data is stored in a session variable, and the page reloads and displays this info from the session variable. If everything is ok on the review page, the user clicks submit and the session variable is sent to another form for processing (sending payment). Upon success, the session is destroyed. Upon failure (bad CC number, for example) - the user is sent back to the form, with all of the fields filled in just like before, so that they can check for errors and try again (session is NOT destroyed). Does anyone see anything wrong with this, from a security or best practices stand point? UPDATE I'm thinking I can get rid of a step - storing the info in a session EVER. Just have a one page checkout, no review page... makes sense.

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Vim: Call an ex command (set) from function?

- by sixtyfootersdude

Drawing a blank on this, and google was not helpful. Want to make a function like this: function JakPaste() let tmp = :set paste? if tmp == "paste" set nopaste else set paste endif endfunction map <F2> :call JakPaste()<CR> However this does not work. I have isolated the broken line: function JakPaste() let tmp = set paste? endfunction map <F2> :call JakPaste()<CR> Pressing F2 results in this error: Error detected while processing function JakPaste: line 1: E121: Undefined variable: set E15: Invalid expression: set paste? Hit ENTER or type command to continue How should I call an ex command (set) from a vim function? This seems somewhat relevant however I still don't get it.

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Performance Tricks for C# Logging

- by Charles

I am looking into C# logging and I do not want my log messages to spend any time processing if the message is below the logging threshold. The best I can see log4net does is a threshold check AFTER evaluating the log parameters. Example: _logger.Debug( "My complicated log message " + thisFunctionTakesALongTime() + " will take a long time" ) Even if the threshold is above Debug, thisFunctionTakesALongTime will still be evaluated. In log4net you are supposed to use _logger.isDebugEnabled so you end up with if( _logger.isDebugEnabled ) _logger.Debug( "Much faster" ) I want to know if there is a better solution for .net logging that does not involve a check each time I want to log. In C++ I am allowed to do LOG_DEBUG( "My complicated log message " + thisFunctionTakesALongTime() + " will take no time" ) since my LOG_DEBUG macro does the log level check itself. This frees me to have a 1 line log message throughout my app which I greatly prefer. Anyone know of a way to replicate this behavior in C#?

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Tarballing without git metadata

- by zaf

My source tree contains several directories which are using git source control and I need to tarball the whole tree excluding any references to the git metadata or custom log files. I thought I'd have a go using a combo of find/egrep/xargs/tar but somehow the tar file contains the .git directories and the *.log files. This is what I have: find -type f . | egrep -v '\.git|\.log' | xargs tar rvf ~/app.tar Can someone explain my misunderstanding here? Why is tar processing the files that find and egrep are filtering? I'm open to other techniques as well.

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Problem updating a database field from my controller

- by ben

I have an update method in my users controller that I call from a HTTPService in Flex 4. The update method is as follows: def updateName @user = User.find_by_email(params[:email]) @user.name = params[:nameNew] render :nothing => true end This is console output: Processing UsersController#updateName (for 127.0.0.1 at 2010-05-24 14:12:49) [POST] Parameters: {"action"="updateName", "nameNew"="ben", "controller"="users", "email"="[email protected]"} User Load (0.6ms) SELECT * FROM "users" WHERE ("users"."email" = '[email protected]') LIMIT 1 Completed in 20ms (View: 1, DB: 1) | 200 OK [http://localhost/users/updateName] But when I check my database, the name field is never updated. What am I doing wrong? Thanks for reading.

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Multiple video overlay - need advice

- by Marvin

Hi, I'm working on a project and I need some advice. Just some background, Im not a programmer though at times I do some fiddling and I am generally comfortable with more specific terms. Now for the actual issue, I have a folder with 10 small videos (4/7 secs max each) and I would like to display them full screen looping and overlaid. I'm not too sure on at what should I be looking at, I thought maybe processing but my most serious issue if that I cant even ask for help since I don't know what I need. Thank you for your time.

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Fast single thread comet server, possible?

- by Pepijn

I recently encountered a few cases where a server would distribute an event stream that contains the exact same data for all listeners, such as a 'recent activity' box. It occurred to me that it is quite strange and inefficient to have a server like Apache run a thread processing and querying the database for every single comet stream containing the same data. What I would do for those global(not per user) streams is run a single thread that continuously emits data, and a new (green)thread for every new request that outputs the headers and then 'merges' into the main thread. Is it possible for one thread to serve multiple sockets, or for multiple clients to listen to the same socket? An example o = event # threads received | a b # 3 o / / # 3 - |/_/ | # 1 o c # 2 a, b | / o/ # 2 a, b o # 1 a, b, c | # connection b closed o # 1 a, c Does something like this exist? Would it work? Is it possible to do? Disclaimer: I'm not a server expert.

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Current state of client-side XSLT

- by Casey

Last I heard, Blizzard was one of the few companies to put client-side XSLT into practice (2008). Is this still the case in 2011, or are more people now exploring this technique in production? It seems that modern browsers (IE9, FF4, Chrome) and client processing power are primed to exploit this standard for tangible savings in server CPU power and bandwidth on large scale properties. Am I missing something? The negative aspects I'm aware of include * additional rendering time * additional assets required on uncached page load * additional layer of complexity * noticably less developer experience than server-side template techniques The benefits I perceive include * distributed template composition (offloaded on the client) * caching of common template fragments offloaded on the client * logical separation of document structure and data * well-documented web standard supported by all modern browsers Finally, although I know it's impossible to predict the future, I am curious to know opinions on whether or not client-side XSLT's day will come. With interest in HTML5 driving users to upgrade their browsers and developers to explore new techniques, I would say yes. How about you? Thanks in advance, Casey

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Multiple merchant accounts with Activemerchant gem.

- by sosborn

I am developing a rails site that will allow a group of merchants (5 - 10) to accept credit card orders online. I plan on using the Activemerchant gem to handle the processing. In this case, each merchant will have their own merchant accounts to handle the payments. Storing banking information like that is not something I am a fan of. This could be solved by queing orders and allowing the merchant to log in to the site, input their credentials and process the order. However, if I go that route then it seems to me that I would have to store the customers' credit card information temporarily until the merchant has the opportunity to log in and process the order, which to me is the greater evil. Has anyone dealt with this situation? If so, what are the options available and what pitfalls should I look out for? In my mind, security customer credit card information is priority number one with the merchant account information a close second.

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Is Oracle AQ/Streams of any use in my situation?

- by RenderIn

I'm writing a workflow system that is driven entirely at each step by explicit human interaction. That is, a task is assigned to a person, that person selects from a few limited options {approve, reject, forward}, and then it is either sent along to the next person or terminated. Just curious of Oracle Streams/AQ has anything to offer over flat tables managed by regular web application code. The amount of processing after each action is fairly limited and the volume is not terribly high, so there's not really a need to throttle things by throwing them into a queue. What are some of the benefits of introducing a queue structure, or is it overkill for my situation?

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Converting raw bytes into audio sound

- by Afro Genius

In my application I inherit a javastreamingaudio class from the freeTTS package then bypass the write method which sends an array of bytes to the SourceDataLine for audio processing. Instead of writing to the data line, I write this and subsequent byte arrays into a buffer which I then bring into my class and try to process into sound. My application processes sound as arrays of floats so I convert to float and try to process but always get static sound back. I am sure this is the way to go but am missing something along the way. I know that sound is processed as frames and each frame is a group of bytes so in my application I have to process the bytes into frames somehow. Am I looking at this the right way? Thanx in advance for any help.

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Process XML in C# using external entity file

- by Ryan Berger

I am processing an XML file (which does not contain any dtd or ent declarations) in C# that contains entities such as é and à. I receive the following exception when attempting to load an XML file... XmlDocument xmlDoc = new XmlDocument(); xmlDoc.LoadXml(record); Reference to undeclared entity 'eacute'. I was able to track down the proper ent file here. How do I tell XmlDocument to use this ent file when loading my XML file?

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paperclip callbacks or simple processor?

- by holden

I wanted to run the callback after_post_process but it doesn't seem to work in Rails 3.0.1 using Paperclip 2.3.8. It gives an error: undefined method `_post_process_callbacks' for #<Class:0x102d55ea0> I want to call the Panda API after the file has been uploaded. I would have created my own processor for this, but as Panda handles the processing, and it can upload the files as well, and queue itself for an undetermined duration I thought a callback would do fine. But the callbacks don't seem to work in Rails3. after_post_process :panda_create def panda_create video = Panda::Video.create(:source_url => mp3.url.gsub(/[?]\d*/,''), :profiles => "f4475446032025d7216226ad8987f8e9", :path_format => "blah/1234") end I tried require and include for paperclip in my model but it didn't seem to matter. Anyideas?

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GWT RPC - Does it do enough to protect against CSRF ?

- by sri

GWT's RPC mechanism does the following things on every HTTP Request - Sets two custom request headers - X-GWT-Permutation and X-GWT-Module-Base Sets the content-type as text/x-gwt-rpc; charset=utf-8 The HTTP request is always a POST, and on server side GET methods throw an exception (method not supported). Also, if these headers are not set or have the wrong value, the server fails processing with an exception "possibly CSRF?" or something to that effect. Question is : Is this sufficient to prevent CSRF? Is there a way to set custom headers and change content type in a pure cross-site request forgery method?

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Minimum Hardware requirements for Android development

- by vishwanath

I need information about minimum hardware requirement I need to have better experience in developing Android application. My current configuration is as follows. P4 3.0 GHz, 512 MB of ram. Started with Hello Android development on my machine and experience was sluggish, was using Eclipse Helios for development. Emulator used to take lot of time to start. And running program too. Do I need to upgrade my machine for the development purpose or is there anything else I am missing on my machine(like heavy processing by some other application I might have installed). And If I do need to upgrade, do I need to upgrade my processor too(that counts to new machine actually, which I am not in favor of), or only upgrading RAM will suffice.

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How do you use scripting language (PHP, Python, etc) to improve your productivity?

- by Edwin

Hi, I'm a Delphi developer on the Windows platform, recently read the PHP tutorial at W3CSchools, it looks interesting. We all know scripting languages are very good at web site development, but I also want to utilize it to improve my productivity or get some tedious tasks done quickly, maybe some quick-and-dirty string/file processing? How do you usually do with scripting languages apart from software development? And we need a responsive, decent IDE/editor in order to gain productivity when writing scripts for this purpose? Thanks for in advance!

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Stop applet execution on load, pause/resume using javascript?

- by Zane

I'm making something of a java applet gallery for my website (processing applets, if you're interested) and I'd like to keep the applets from running when the sit first loads. Then, when the appropriate button is clicked, a piece of javascript would tell the applet to continue execution until another button is pressed to stop it. I know that I can use appletName.start() and appletName.stop(), but it doesn't seem to work on load, at least not well. I'm using element.getElementsById( "applet" ) to get the applets to use the start and stop methods on. It slows Firefox to a crawl for some reason.

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Using HTTP Vary header to decide on a strategy to process a request

- by Jacques René Mesrine

I have a specific REST endpoint that creates a topic in a forum; but I want to apply different strategies when processing the request. e.g. If client A makes the call, perform moderation. if client B makes the call, do something else. The easiest would be to add a query param for differentiation: POST /resource?from=xyz Another brilliant idea is to use the Vary HTTP header. POST /resource Vary: xyz Any problems with this approach ?

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Using Windows media foundation

- by Martin Beckett

Ok so my new gig is high performance video (think Google streetview but movies) - the hard work is all embedded capture and image processing but: I was looking at the new MS video offerings to display content = Windows Media Foundation. Is anyone actually using this ? There are no books on the topic. The only documentation is a developer team blog with a single entry 9 months old. I thought we had got past having to learn an MS api by spying on the com control messages! Is it just another wrapper around the same old activeX control?

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How to properly use Gearman with my PHP application?

- by luckytaxi

For now I just want to use Gearman for background processing. For example, I need to email a recipient that they have a private message waiting for them once the sender submits their message into the DB. I assume I can run the worker/client and server on my primary server but I have no problems offloading some of the tasks to a different web server. Anyways, my question is how do I handle multiple "functions?" Let's say I need a job that handles the email portion and a job to handle image manipulation. Can I have multiple functions in the worker? I've followed a couple of examples I found online but each example only shows one function being initialized. Do I have to start up multiple "workers" to handle multiple functions?

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What Python based Dashboard options exist?

- by stuartcw

I want to create a Dashboard on each server to show it's health and the results of some daily processing. I plan to hook up shell scripts and Python programs to collect the data. Instead of writing a web-based interface, I thought it would be good to use a python based web dashboard that could render the results in various business user and manager friendly formats. What are my options to do this? I am primarily interested in Python RedHat Linux, but other platforms are interesting too. I'm also open to Perl and Ruby based solutions especially if the plugins can be language neutral.

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Multiple Socket Connections

- by BSchlinker

I need to write a server which accepts connections from multiple client machines, maintains track of connected clients and sends individual clients data as necessary. Sometimes, all clients may be contacted at once with the same message, other times, it may be one individual client or a group of clients. Since I need confirmation that the clients received the information and don't want to build an ACK structure for a UDP connection, I decided to use a TCP streaming method. However, I've been struggling to understand how to maintain multiple connections and keep them idle. I seem to have three options. Use a fork for each incoming connection to create a separate child process, use pthread_create to create an entire new thread for each process, or use select() to wait on all open socket IDs for a connection. Recommendations as to how to attack this? I've begun working with pthreads but since performance will likely not be an issue, multicore processing is not necessary and perhaps there is a simpler way.

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What is going on with the "return fibonacci( number-1 ) + fibonacci( number-2 )"?

- by user1478598

I have problem understanding what the return fibonacci( number-1 ) + fibonacci( number-2 ) does in the following program: import sys def fibonacci( number ): if( number <= 2 ): return 1 else: return fibonacci( number-1 ) + fibonacci( number-2 ) The problem is that I can't imagine how this line works: return fibonacci( number-1 ) + fibonacci( number-2 ) Does the both of the "fibonacci( number-1 )" and "fibonacci( number-2 )" being processed at the same time? or the "fibonacci( number-1 )" is the first to be processed and then the second one? I only see that processing both of them would eventually return '1' so the last result I expect to see it is a '1 + 1' = '2' I would appreciate a lot, If someone can elaborately explain the process of its calculation. I think this is a very newb question but I can't really get a picture of its process.

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postgres store with composite value type, or a better way of attributing an inverted index

- by Hassan Syed

can't seem to figure out the syntax for populating a hstore with a value of composite type -- note: I do not want to convert a record to a hstore. select hstore('hello => ROW(1,2)'); I know it's something simple; However, google is not my friend today. use case : custom inverted index. The data is modelling an inverted index of lexemes, the composite data types are various probabilities related to the lexemes which I will use to implement document clustering. Does anyone know a better way of doing this ? I'm open to using an external system if it allows attaching attributes to key-posting pairs in the inverted index. I'd use something external if it had solid support for what I am trying to do, I suspect that sticking 3-10k lexemes per tuple and then doing batch processing on them is gonna be nasty as the whole hstore will have to be parsed and converted .

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