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• Why can a class not be unloaded without unloading the classloader?

  - by Everyone

  The answer to 'unloading classes in java' says - "The only way that a Class can be unloaded is if the Classloader used is garbage collected." I took a look at the JLS but couldn't understand it Why is this the case?

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• Is there an OpenID demo server out there?

  - by billpg

  Hi everyone. I'm doing some experiements with adding OpenID to something I'm working on, and I'd like to test out a few providers. Is there a server out there that will go through the OpenID login process (same way that the StackOverflow group does) and tell me all the information the provider shows. I imagine it would work like... I go to example.com and type in https://www.google.com/accounts/o8/id example.com bounces me to google. I log in. Google asks me to confirm if I allow example.com access to everything. Google bounces me back to example.com example.com tells me my OpenID, email address, anything else it's got. Does such a thing please already exist?

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• lwjgl 101: How can I use VBOs?

  - by Vuntic

  How can I draw anything in lwjgl using VBOs? When I follow the tutorial, it just breaks. I've also tried running this example (with the byteorder fix) but it just displays a blank window. SO hasn't been helpful to me yet, but this is the last place I can think of that might have an answer...

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• Mitigating the 'firesheep' attack at the network layer?

  - by pobk

  What are the sysadmin's thoughts on mitigating the 'firesheep' attack for servers they manage? Firesheep is a new firefox extension that allows anyone who installs it to sidejack session it can discover. It does it's discovery by sniffing packets on the network and looking for session cookies from known sites. It is relatively easy to write plugins for the extension to listen for cookies from additional sites. From a systems/network perspective, we've discussed the possibility of encrypting the whole site, but this introduces additional load on servers and screws with site-indexing, assets and general performance. One option we've investigated is to use our firewalls to do SSL Offload, but as I mentioned earlier, this would require all of the site to be encrypted. What's the general thoughts on protecting against this attack vector? I've asked a similar question on StackOverflow, however, it would be interesting to see what the systems engineers thought.

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• How to compare characters (respecting a culture)

  - by tanascius

  For my answer in this question I have to compare two characters. I thought that the normal char.CompareTo() method would allow me to specify a CultureInfo, but that's not the case. So my question is: How can I compare two characters and specify a CultureInfo for the comparison?

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• c# Tuple - What is a practical use of Tuple [duplicate]

  - by Nate Pet

  This question already has an answer here: What and When to use Tuple? 5 answers I was looking at examples online of Tuple but I do not see any ideal use of it. Meaning, it seems like a place to store variables. Is there any practical use of Tuple. What I like to do is to pass in a value to the tuple and then have it return back 3 values which are all strings.

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• Project Euler #9 (Pythagorean triplets) in Clojure

  - by dbyrne

  My answer to this problem feels too much like these solutions in C. Does anyone have any advice to make this more lispy? (use 'clojure.test) (:import 'java.lang.Math) (with-test (defn find-triplet-product ([target] (find-triplet-product 1 1 target)) ([a b target] (let [c (Math/sqrt (+ (* a a) (* b b)))] (let [sum (+ a b c)] (cond (> a target) "ERROR" (= sum target) (reduce * (list a b (int c))) (> sum target) (recur (inc a) 1 target) (< sum target) (recur a (inc b) target)))))) (is (= (find-triplet-product 1000) 31875000)))

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• What are some good usability guidelines an average developer should follow?

  - by Allain Lalonde

  I'm not a usability specialist, and I really don't care to be one. I just want a small set of rules of thumb that I can follow while coding my User Interfaces so that my product has decent usability. At first I thought that this question would be easy to answer "Use your common sense", but if it's so common among us developers we wouldn't, as a group, have a reputation for our horrible interfaces. Any Suggestions?

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• Can a Static Nested Class be Instantiated Multiple Times?

  - by stormin986

  Given what I know of every other type of static feature of programming––I would think the answer is 'no'. However, seeing statements like OuterClass.StaticNestedClass nestedObject = new OuterClass.StaticNestedClass(); makes me wonder.

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• Run Jav-applets directly

  - by PleaseHelpMe

  Hello guys. I have a problem. how i can run my hava-aplet directly without embendend in my web page? If i answer on this question in a few minutes i will pass exam else i going out from university!!! please guys help!!

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• Django - Can you use property as the field in an aggregation function?

  - by orokusaki

  I know the short answer because I tried it. Is there any way to accomplish this though (even if only on account of a hack)? class Ticket(models.Model): account = modelfields.AccountField() uuid = models.CharField(max_length=36, unique=True) created = models.DateTimeField(auto_now_add=True) class Meta: ordering = ['created'] @property def repair_cost(self): # cost is a @property of LineItem(models.Model) return self.lineitem_set.aggregate(models.Sum('cost'))

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• Remove line from a file using a variable line number

  - by paultop6

  Hi Guys, This is probably a simple one to answer, but im stuck, so here goes sed '3d' filename (or something like tht) Im having trouble try to use a $VARIABLE instead of the number Any1 know how to get this to work , or any alternative options Regards Paul

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• Why isn't LISP more widely used?

  - by Chris

  I've heard a lot of people espouse the capabilities of LISP and its omnipotent macros. If LISP is such a great language, why isn't it being adopted more? What problems is LISP facing that is holding it back from (re)emerging as popular language? Is it something about LISP itself ("those brackets!" isn't the answer, is it?!), or its competitors (e.g. the dominance of Java, .NET)?

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• How to program simple chat bot AI?

  - by Larsenal

  I want to build a bot that asks someone a few simple questions and branches based on the answer. I realize parsing meaning from the human responses will be challenging, but how do you setup the program to deal with the "state" of the conversation? EDIT: It will be a one-to-one conversation between a human and the bot.

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• Is it possible to have more than P2P on iPhone with Bluetooth

  - by Ricardo Ferreira

  Hi all, This seems like a straightforward google search answer, but after a while, I still can't be 100% sure of this. I've found Z2Live (http://www.z2live.com/), which is basically a layer above GameKit and they too use only P2P with Bluetooth. So I just want to be sure if I can only have P2P with Bluetooth or if I can have like 4 iPhones all connected to a server (who will also be a client) using Bluetooth. Thanks in advance.

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• How do "modern JVMs" differ from older JVMs?

  - by Lord Torgamus

  Here's a phrase that I heard a lot throughout high school and university computer science classes: "That's not an issue for modern JVMs." Usually this would come up in discussions about overall performance or optimization strategies. It was always treated as a kind of magical final answer, though, as if it makes issues no longer worth thinking about. And that just leads me to wonder: what are the differences between the prototypical "modern JVM" and older JVMs, really?

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• Linux foxboard network monitor

  - by het.oosten

  I want to use a Foxboard a simple network monitor for multiple routers (all routers are connected to the internet). Foxboard is a mini pc with an embedded version of Debian. My idea is to use multiple virtual network devices like this: eth0 192.168.2.10 eth0:1 192.168.3.10 eth0:2 192.168.4.10 I found a nice Python script to ping an external host here (the solution from Ryan Cox): http://stackoverflow.com/questions/316866/ping-a-site-in-python Is it possible to configure Debian to use eth0 when I ping www.site-a.com and eth0:1 when I ping www.site-b.com?

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• Regex to allow all php files expect on

  - by Tim

  Hi all, I have this regex that allow all php files : ^.*\.([Pp][Hh][Pp]) how can I exclude a specific file, for example test.php ? Thanks for your answer, Best regards

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• What's the BPF for HTTP?

  - by Gtker

  The definition can be seen here. The candidate answer may be tcp and dst port 80,but can tcp and dst port 80 guarantee it's HTTP traffic and includes all HTTP traffic? It seems not,because some site can be visited by specifying a different port other than 80 this way: http://domain.name:8080 So my question is: what's the exact BPF for HTTP?

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• Qt C++ XML, validating against a DTD?

  - by Airjoe

  Is there a way to validate an XML file against a DTD with Qt's XML handling? I've tried googling around but can't seem to get a straight answer. If Qt doesn't include support for validating an XML file, what might be the process of implementing validation myself? Any good reference to start with in regards to validating XML against a spec? Thanks for the help!

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• How do I tell cmake to use Command line pattern?

  - by Runner

  Quoted from this answer: `pkg-config --cflags --libs gtk+-2.0` Suppose FindGTK2() is not working,but pkg-config --cflags --libs gtk+-2.0 is OK,how do I include requires lib/header files?

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• Really want to know how to set bg image to GtkEventBox.

  - by PP

  I want to set background image to GtkEventBox using style/rc file. The reason i want to do this, I want to put some widgets in that event box so that they will be displayed with the background. I am using GTk+ and C. ptomato: I know previously I had posted same question but there was not satisfactory answer so please don't prompt for that.

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• Hidden features of Emacs Lisp?

  - by anon

  What are some features of Emacs Lisp that you use to solve real problems? One feature per answer Give an example and short description of the feature, not just a link to documentation Label the feature using bold title as the first line See also: Hidden features of Python Hidden features of Ruby Hidden features of Perl Hidden features of Java

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• Changing GORM table name

  - by Matthias Hryniszak

  Hi I'm fighting to get the following mapping working in Grails 1.3.1 and MySQL: class Login { int id String email static mappings = { table 'my_table' id column: "Mgr_id" version: false } } No matter what I do the queries that are being issued refer to "schema.login" table instead of "schema.my_table". This is very frustrating... Can anyone answer why this might not be working?

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• Can I use UML to diagram ERDs?

  - by JPCF

  Hi, 1) Can I use UML to diagram ERDs? 2) If answer to 1 is "yes", the use of UML is standardized and widely used for that purpose? Thanks

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