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• Disable public Tomcat6 stack trace

  - by The NinjaSysadmin

  Can anyone advise me how I can go about disabling Tomcat6 from displaying stacktrace output to the browser? Tomcat: 6.0.29 I have made the following changes to /opt/apache-tomcat-6.0.29/conf/web.xml <error-page> <exception-type>java.lang.Throwable</exception-type> <location>/error.jsp</location> </error-page> I'm told putting this in place will give a white screen if the file doesn't exist, however I'm getting stack traces to the screen.

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• Polymorphic Numerics on .Net and In C#

  - by Bent Rasmussen

  It's a real shame that in .Net there is no polymorphism for numbers, i.e. no INumeric interface that unifies the different kinds of numerical types such as bool, byte, uint, int, etc. In the extreme one would like a complete package of abstract algebra types. Joe Duffy has an article about the issue: http://www.bluebytesoftware.com/blog/CommentView,guid,14b37ade-3110-4596-9d6e-bacdcd75baa8.aspx How would you express this in C#, in order to retrofit it, without having influence over .Net or C#? I have one idea that involves first defining one or more abstract types (interfaces such as INumeric - or more abstract than that) and then defining structs that implement these and wrap types such as int while providing operations that return the new type (e.g. Integer32 : INumeric; where addition would be defined as public Integer32 Add(Integer32 other) { return Return(Value + other.Value); } I am somewhat afraid of the execution speed of this code but at least it is abstract. No operator overloading goodness... Any other ideas? .Net doesn't look like a viable long-term platform if it cannot have this kind of abstraction I think - and be efficient about it. Abstraction is reuse.

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• Limited RGB range due to HDMI cable?

  - by Cedric Reichenbach

  I have a NVidia GeForce GTX 660, connected to a Samsung SyncMaster S24B350 through a HDMI cable. On my computer, I'm running both, Windows 8 and Linux Mint. I think that something might prevent my system from using the whole RGB spectrum, since bright colors seem to vanish into white under standard settings. However, under Linux I could switch to a limited color range mode (16-235) and suddenly, the image looked much better. Is it possible that the HDMI cable limits color range (since it was originally inteded for TVs)? Is there a way of switching to limited color range mode in Windows 8 as well?

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• Testing Async downloads with ASIHTTPRequest

  - by Baishampayan Ghose

  I am writing a simple library using ASIHTTPRequest where I am fetching URLs in an async manner. My problem is that the main function that I have written to test my lib exits before the async calls are finished. I am very new to Obj C and iPhone development, can anyone suggest a good way to wait before all the requests are finished in the main function? Currently, my main function looks like this - int main(int argc, char *argv[]) { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; IBGApp *ibgapp = [[IBGApp alloc] init]; IBGLib *ibgl = [[IBGLib alloc] initWithUsername:@"joe" andPassword:@"xxx"]; // The two method calls below download URLs async. [ibgl downloadURL:@"http://yahoo.com/" withRequestDelegate:ibgapp andRequestSelector:@selector(logData:)]; [ibgl downloadURL:@"http://google.com/" withRequestDelegate:ibgapp andRequestSelector:@selector(logData:)]; [pool release]; return 0; // I reach here before the async calls are done. } So what is the best way to wait till the async calls are done? I tried putting sleep, but obviously doesn't work.

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• Texture and Pattern Generator

  - by Ara

  I use Adobe Fireworks for its Texture and Pattern tools to make things like this: http://i.imgur.com/sci7Roc.png and then i copy-paste it to Flash Professional (Adobe) to use there. but fireworks is so slow and buggy is there a free or commercial software to do this simple Texture / Pattern thing easily? Texture (like the second image above) Patter and Texture (like the first one) Transparent Texture, so the background color would be visible instead of the white lines in second image The ability to copy and paste it (as PNG 32 or any alpha transparent image) so i don't have to save it first and then import it to flash * I Use Mac OS X 10.8.4 *

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• Raspberry Pi stuck at splash screen

  - by Matthew

  I have a raspberry pi and I am stuck at the splash screen. In the top right of the screen there is an image of a Raspberry. When I first power on the device, I get the colored screen, and then I get the image of the raspberry followed by a white cursor which quickly freezes or disappears. I put on the debian version of wheezy that allows java. (the soft float version) Any assistance would be greatly appreciated. BTW I did have it working at one point in time and all I did was go to the terminal (logged out of the GUI) and did a shutdown -h now command. But since then I've even started with a brand new version of the image and it is still not working. Oh and I did try the same SD card with a version of arch linux and it worked fine.

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• Why does text look so Horrible in my HD monitor???

  - by Laura

  I just bought a 1080p 22" Samsung HD monitor (connected via HDMI) and the picture and video quality is great but the text quality is absolutely horrible. Even as I type now all the text in this text box as well as in the browser toolbar and start menu, etc looks weird - like it all has a white outline around it that makes it jagged and hard to read. It hurts my eyes just to look at it. I am running my PC in the suggested native resolution of 1920 by 1080, so what's the problem? Is this one of the unavoidable downsides of using a HD monitor? Is there a solution to the problem?

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• Makefile fails to install file correctly, installing HPL

  - by zarose

  I started installing HPL a while ago, and had a related question. I've been following along with this guide from Intel. I figure this warrants a whole new one. When I try to make the archive, the output seems fine until the end, where it gives an error. make[2]: Entering directory `/hpl-2.0/src/auxil/intel64' Makefile:47: Make.inc: No such file or directory make[2]: *** No rule to make target `Make.inc'. Stop. make[2]: Leaving directory `/hpl-2.0/src/auxil/intel64' make[1]: *** [build_src] Error 2 make[1]: Leaving directory `/hpl-2.0' make: *** [build] Error 2 Going to the directory /hpl-2.0/src/auxil/intel64 shows a file, "Make.inc", but it's highlighted red, and the white text blinks. Is there a way to manually make that file? What do I need to do to get the makefile to do this for me?

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• Why is my system waiting for google-analytics?

  - by mikeroosa

  When I go to certain websites that have google analytics, they never load up. One example is www.jquery.com. I tried in firefox, chrome, safari and explorer. Chrome & safari, flash the home page then it disappears and the screen goes white. Firefox never loads anything and the spinner just keeps spinning. Loads fine in explorer. Any ideas of what may be going on? If I use my laptop, on my same home internet connection, it works fine. This is not happening on all sites with analytics, just certain ones.

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• Why is my system waiting for google-analytics?

  - by mikeroosa

  When I go to certain websites that have google analytics, they never load up. One example is www.jquery.com. I tried in firefox, chrome, safari and explorer. Chrome & safari, flash the home page then it disappears and the screen goes white. Firefox never loads anything and the spinner just keeps spinning. Loads fine in explorer. Any ideas of what may be going on? If I use my laptop, on my same home internet connection, it works fine. This is not happening on all sites with analytics, just certain ones.

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• Laptop Suggestions and Alternatives [closed]

  - by Pennf0lio

  Hi, I need some suggestions and alternatives in buying laptops. Me and my Girlfriend are planning to buy laptops. Her budget is $600 and mine is $850. We both love apple products, because of it's elegant design and yet powerful. But we can't yet afford mac laptops.. so we are looking for alternatives. One we see is The Stylish Sony E-Series (white version) see it here. To give you an Idea, Software she frequently use are Photoshop, MS Office and firefox. Mine is Adobe CS4, Cinema4d, MS Office and firefox. We are looking for light, slick and clean interface of a laptop (very close to mac notebooks). Thanks!

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• MySQL Query That Can Pull the Data I am Seeking?

  - by Amy

  On the project I am working on, I am stuck with the table structure from Hades. Two things to keep in mind: I can't change the table structure right now. I'm stuck with it for the time being. The queries are dynamically generated and not hard coded. So, while I am asking for a query that can pull this data, what I am really working toward is an algorithm that will generate the query I need. Hopefully, I can explain the problem without making your eyes glaze over and your brain implode. We have an instance table that looks (simplified) along these lines: Instances InstanceID active 1 Y 2 Y 3 Y 4 N 5 Y 6 Y Then, there are multiple data tables along these lines: Table1 InstanceID field1 reference_field2 1 John 5 2 Sally NULL 3 Fred 6 4 Joe NULL Table2 InstanceID field3 5 1 6 1 Table3 InstanceID fieldID field4 5 1 Howard 5 2 James 6 2 Betty Please note that reference_field2 in Table1 contains a reference to another instance. Field3 in Table2 is a bit more complicated. It contains a fieldID for Table 3. What I need is a query that will get me a list as follows: InstanceID field1 field4 1 John Howard 2 Sally 3 Fred The problem is, in the query I currently have, I do not get Fred because there is no entry in Table3 for fieldID 1 and InstanceID 6. So, the very best list I have been able to get thus far is InstanceID field1 field4 1 John Howard 2 Sally In essence, if there is an entry in Table1 for Field 2, and there is not an entry in Table 3 that has the instanceID contained in field2 and the field ID contained in field3, I don't get the data from field1. I have looked at joins till I'm blue in the face, and I can't see a way to handle the case when table3 has no entry.

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• Fabric "TypeError: not all arguments converted during string formatting"

  - by Brian Carpio

  I have the following fabric task: @task def deploy_west_ec2_ami(name, puppetClass, size='m1.small', region='us-west-1', basedn='joe', ldap='arch-ldap-01', secret='secret', subnet='subnet-d43b8ab d', sgroup='sg-926578fe'): execute(deploy_ec2_ami, name='%s',puppetClass='%s',size='%s',region='%s',basedn='%s',ldap='%s',secret='%s',subnet='%s',sgroup='%s' %(name, puppetClass , size, region, basedn, ldap, secret, subnet, sgroup)) However when I run the command: fab deploy_west_ec2_ami:test,java I get the following Traceback: Traceback (most recent call last): File "/usr/local/lib/python2.6/dist-packages/fabric/main.py", line 710, in main *args, **kwargs File "/usr/local/lib/python2.6/dist-packages/fabric/tasks.py", line 321, in execute results['<local-only>'] = task.run(*args, **new_kwargs) File "/usr/local/lib/python2.6/dist-packages/fabric/tasks.py", line 113, in run return self.wrapped(*args, **kwargs) File "/home/bcarpio/Projects/githubenterprise/awsdeploy/fabfile.py", line 35, in deploy_west_ec2_ami execute(deploy_ec2_ami, name='%s',puppetClass='%s',size='%s',region='%s',basedn='%s',ldap='%s',secret='%s',subnet='%s',sgroup='%s' %(name, puppetClass, size, region, basedn, ldap, secret, subnet, sgroup)) TypeError: not all arguments converted during string formatting I am not sure I understand why. I am pretty sure I have all the values defined here just fine. Also when I run the execute task deploy_ec2_ami as so: deploy_ec2_ami:test,java,m1.small,us-west-1,'dc\=test\,dc\=net',ldap-01,secret,subnet-d43b8abd,sg-926578fe It works just fine

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• Figure out if element is present in multi-dimensional array in python

  - by Terje

  I am parsing a log containing nicknames and hostnames. I want to end up with an array that contains the hostname and the latest used nickname. I have the following code, which only creates a list over the hostnames: hostnames = [] # while(parsing): # nick = nick_on_current_line # host = host_on_current_line if host in hostnames: # Hostname is already present. pass else: # Hostname is not present hostnames.append(host) print hostnames # ['[email protected]', '[email protected]', '[email protected]'] I thought it would be nice to end up with something along the lines of the following: # [['[email protected]', 'John'], ['[email protected]', 'Mary'], ['[email protected]', 'Joe']] My problem is finding out if the hostname is present in such a list hostnames = [] # while(parsing): # nick = nick_on_current_line # host = host_on_current_line if host in hostnames[0]: # This doesn't work. # Hostname is already present. # Somehow check if the nick stored together # with the hostname is the latest one else: # Hostname is not present hostnames.append([host, nick]) Are there any easy fix to this, or should I try a different approach? I could always have an array with objects or structs (if there is such a thing in python), but I would prefer a solution to my array problem.

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• Why do I get a segmentation fault while redirecting sys.stdout to Tkinter.Text widget in Python?

  - by Brent Nash

  I'm in the process of building a GUI-based application with Python/Tkinter that builds on top of the existing Python bdb module. In this application, I want to silence all stdout/stderr from the console and redirect it to my GUI. To accomplish this purpose, I've written a specialized Tkinter.Text object (code at the end of the post). The basic idea is that when something is written to sys.stdout, it shows up as a line in the "Text" with the color black. If something is written to sys.stderr, it shows up as a line in the "Text" with the color red. As soon as something is written, the Text always scrolls down to view the most recent line. I'm using Python 2.6.1 at the moment. On Mac OS X 10.5, this seems to work great. I have had zero problems with it. On RedHat Enterprise Linux 5, however, I pretty reliably get a segmentation fault during the run of a script. The segmentation fault doesn't always occur in the same place, but it pretty much always occurs. If I comment out the sys.stdout= and sys.stderr= lines from my code, the segmentation faults seem to go away. I'm sure there are other ways around this that I will probably have to resort to, but can anyone see anything I'm doing blatantly wrong here that could be causing these segmentation faults? It's driving me nuts. Thanks! PS - I realize redirecting sys.stderr to the GUI might not be a great idea, but I still get segmentation faults even when I only redirect sys.stdout and not sys.stderr. I also realize that I'm allowing the Text to grow indefinitely at the moment. class ConsoleText(tk.Text): '''A Tkinter Text widget that provides a scrolling display of console stderr and stdout.''' class IORedirector(object): '''A general class for redirecting I/O to this Text widget.''' def __init__(self,text_area): self.text_area = text_area class StdoutRedirector(IORedirector): '''A class for redirecting stdout to this Text widget.''' def write(self,str): self.text_area.write(str,False) class StderrRedirector(IORedirector): '''A class for redirecting stderr to this Text widget.''' def write(self,str): self.text_area.write(str,True) def __init__(self, master=None, cnf={}, **kw): '''See the __init__ for Tkinter.Text for most of this stuff.''' tk.Text.__init__(self, master, cnf, **kw) self.started = False self.write_lock = threading.Lock() self.tag_configure('STDOUT',background='white',foreground='black') self.tag_configure('STDERR',background='white',foreground='red') self.config(state=tk.DISABLED) def start(self): if self.started: return self.started = True self.original_stdout = sys.stdout self.original_stderr = sys.stderr stdout_redirector = ConsoleText.StdoutRedirector(self) stderr_redirector = ConsoleText.StderrRedirector(self) sys.stdout = stdout_redirector sys.stderr = stderr_redirector def stop(self): if not self.started: return self.started = False sys.stdout = self.original_stdout sys.stderr = self.original_stderr def write(self,val,is_stderr=False): #Fun Fact: The way Tkinter Text objects work is that if they're disabled, #you can't write into them AT ALL (via the GUI or programatically). Since we want them #disabled for the user, we have to set them to NORMAL (a.k.a. ENABLED), write to them, #then set their state back to DISABLED. self.write_lock.acquire() self.config(state=tk.NORMAL) self.insert('end',val,'STDERR' if is_stderr else 'STDOUT') self.see('end') self.config(state=tk.DISABLED) self.write_lock.release()

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• Bit of python help

  - by user42780

  I've tried to get this to work, but it just freezes. It should display a pyramid, but all it does is.. halts. from graphics import * valid_colours = ['red', 'blue', 'yellow', 'green'] colour = ['', '', ''] while True: colour[0] = raw_input("Enter your first colour: ") colour[1] = raw_input("Enter your second colour: ") colour[2] = raw_input("Enter your third colour: ") if ((colour[0] and colour[1] and colour[2]) in valid_colours): break while True: width = raw_input("Enter a width between 2-7: ") if width.isdigit(): if (int(width) <= 7 and int(width) >= 2): break width = int(width) win = GraphWin("My Mini Project ", 1000, 1000) # 1000 \ 20 = 50 win.setCoords(0 , 0 , 20, 20) p1 = [0, 2] while width > 0: p = [1, 3] loopWidth = 0 while loopWidth < width: loopWidth = loopWidth + 1 c = 0 while c <= 10: c = c + 1 if c % 2: colour = "white" else: colour = "red" rectangle = Rectangle(Point(p[0],p1[0]), Point(p[1], p1[1])) rectangle.setFill(colour) rectangle.setOutline("black") rectangle.draw(win) p[0] = p[0] + 0.2 p1[0] = p1[0] + 0.2 p[0] = p[0] - 2 p1[0] = p1[0] - 2 p[0] = p[0] + 2 p[1] = p[1] + 2 width = width - 1 p1[0] = p1[0] + 2 p1[1] = p1[1] + 2

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• Where do I connect the two red SATA cables on my motherboard?

  - by Dennis Smith

  I have a Compaq Presario PC SR5110NX. The Processor is AMD Athlon 64 3800+. It has 512 MB of RAM and a 40GB Hard Drive. I'm running Windows XP Professional on it. I have 2 SATA drives, one is black and the other is white. I have 2 red little cables, and they have the letters and numbers on them. On one side of the cable it says "HP P/N:5188-2897 0720". My motherboard is a MCP61PM-HM Rev 1.0B. Where do I connect the two SATA connectors?

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• Blender Render Cycles

  - by usersuper

  I get a very poor Render in cycles. Not just minor problems, but just a cloud of of black and white dots and no contour at all. I read a lot about this now and couldn't get it to work. Does anybody know how to get the settings right. Or better what do I have to pay attention to get better renders. I also tried external renderer like Lux, which increased my CPU usage to 98 % (just the default cube and clicking on Lux and load materials). Is this normal and what could i do to improve that. I have various versions of Blender (2.61,2.62,2.63) on Mac OS X. Thanks for the time.

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• What's next for all of these Microsoft "overlapping" and "enhanced" products ?

  - by pointlesspolitics

  Recently I attended a road show, organised by MS Gold Partner company in the UK. The products discussed were: SharePoint server (2010 and 2007), Exchange server, Office Communication Server 2007, Exchange hosted services Office Live meeting, Office Communicator, System Center Configuration Manager and Operation Manager, VMware, Windows 7 etc. As Microsoft claims the enhancement in the each product against higher version, I felt that clients are not much interested in all these details. For example Office Communicator, surely they have improved a lot the product and first site all said 'WOW' great product, but nobody wish to pay money for all these extra features. Some argued, they are bogged down by all these increased number of menus. They don't need soft call feature included with mobile call. It apply for all other products as well such as MS office (next what 2 ribbons ?), windows OS and many more. Indeed there must be good features in all these products, but is it worth to spend money and time to update the older system ? Also sometimes these feature will decrease the productivity instead increase it. *So do you think what ever enhancement MS is doing in the products is only for selling purpose, not a real use ?? and I think also keep the developer busy learning the new tools and features. * I am sure some some people here will argue that some people need this sort of features. But I am not talking about NASA or MI5 guys. I am talking of usual businesses and joe public. Any ideas welcome.

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• Is there an application that can do a blue screen effect with a webcam?

  - by Axxmasterr

  Background: This is not the blue screen of death I am speaking of but the process called "Blue Screening" that takes and removes a particular colored background from an image so that it can be superimposed on some other video/still picture. If you have ever seen the weatherman stand in front of the map, then you have seen someone doing a blue screen technique. I would like to be able to capture video from my webcam, then send that video to a blue screen program which removes the white (or other color) from the background and then inserts a background of my own choosing. (think of the dead guy in freejack who was calling from all of the different places on earth) Then once the image is superimposed, I would like to pipe it into Skype for video conferencing. Anyone have a good way to do this?

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• How to install GNOME desktop from DVD on CentOS 6 using the command line?

  - by alwbtc

  I have installed CentOS 6 in Virtualbox. Although I have chosen to install General Purpose GNOME Desktop, the GNOME desktop does not start. All I get is a black and white text prompt. I would like to know how I can install GNOME Desktop from the CentOS DVD. How do I mount the DVD image? How do I install GNOME desktop from command line? If I already have the GNOME Desktop installed, why doesn't it start? How can I check from command line that I have GNOME installled? This virtual machine does not have internet connection, that's why I want to install the GNOME Desktop from DVD.

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• Favicon on gmail has changed from the envelope to a black gun. How do i change it back and why did i

  - by Victoria

  I think my gmail account might have been hacked because I've recently noticed a change in the favicon displayed in the url and the tab, when I logged onto my gmail account. It used to be the common red and white envelope and now it's a black gun. Can anyone tell if this is enough to conclude that my account has been hacked or tampered with? I know someone that would be capable and most probably willing to cause problems to my account among other things. This would be my opsessive ex who's best friend is a hacker. Can anyone help? I need to know if someone has reigns to my computer. And how do I change the favicon back to its orginial image? The black gun really bothers me. Thanks everyone!!!

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• Why does text look so Horrible on my HD monitor?

  - by Laura

  I just bought a 1080p 22" Samsung Syncmaster 2333HD (connected via HDMI) and the picture and video quality is great but the text quality is absolutely horrible. This monitor has a built in HD TV tuner. Even as I type now all the text in this text box as well as in the browser toolbar and start menu, etc looks weird - like it all has a white outline around it that makes it jagged and hard to read. It hurts my eyes just to look at it. I am running my PC in the suggested native resolution of 1920x1080, so what's the problem? Is this one of the unavoidable downsides of using a HD monitor? Is there a solution to the problem?

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• iMac invalid memory access and then crash?

  - by Sam McAfee

  My iMac G5 from a few years ago (the square white one) dies now, with a message about an invalid memory access. It goes straight to an Open Firmware prompt and doesn't even load the Mac OS at all. Am I correct in guessing that the memory is probably the issue, and that if I replace it, we may be able to boot again as normal? That's my gut feeling anyway, so I ordered some more memory and plan to swap it today. Any thoughts? Ideas?

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• Microsoft Outlook: show multi-day appointments as boxes in calendar day and week view

  - by Bernd

  I would like to show appointments spanning several days the same way as appintments within a single day. Single day appointments are shown with a white or colored box, covering the day horizontally. Multi-day appointments are shown in the day/week header and are indicated blue or purple on the left side of a day. This happens even if a multi-day appointment is not an all-day appointment (i.e. checkbox is off) and I have a start and end time. I frequently have a hard time seeing appointment overlaps wenn acceping single day appointments. Therefore I am looking for multi-day appointments shown the same way as single day appointments. I am on Outlook 2003.

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