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  • debugging JBoss 100% CPU usage

    - by Nate
    We are using JBoss to run two of our WARs. One is our web app, the other is our web service. The web app accesses a database on another machine and makes requests to the web service. The web service makes JMS requests to other machines, aggregates the data, and returns it. At our biggest client, about once a month the JBoss Java process takes 100% of all CPUs. The machine running JBoss has 8 CPUs. Our web app is still accessible during this time, however pages take about 3 minutes to load. Restarting JBoss restores everything to normal. The database machine and all the other machines are fine, only the machine running JBoss is affected. Memory usage is normal. Network utilization is normal. There are no suspect error messages in the JBoss logs. I have set up a test environment as close as possible to the client's production environment and I've done load testing with as much as 2x the number of concurrent users. I have not gotten my test environment to replicate the problem. Where do we go from here? How can we narrow down the problem? Currently the only plan we have is to wait until the problem occurs in production on its own, then do some debugging to determine the cause. So far people have just restarted JBoss when the problem occurred to minimize down time. Next time it happens they will get a developer to take a look. The question is, next time it happens, what can be done to determine the cause? We could setup a separate JBoss instance on the same box and install the web app separately from the web service. This way when the problem next occurs we will know which WAR has the problem (assuming it is our code). This doesn't narrow it down much though. Should I enable JMX remote? This way the next time the problem occurs I can connect with VisualVM and see which threads are taking the CPU and what the hell they are doing. However, is there a significant down side to enabling JMX remote in a production environment? Is there another way to see what threads are eating the CPU and to get a stacktrace to see what they are doing? Any other ideas? Thanks!

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  • Question about effective logging in C#

    - by MartyIX
    I've written a simple class for debugging and I call the method Debugger.WriteLine(...) in my code like this: Debugger.WriteLine("[Draw]", "InProgress", "[x,y] = " + x.ToString("0.00") + ", " + y.ToString("0.00") + "; pos = " + lastPosX.ToString() + "x" + lastPosY.ToString() + " -> " + posX.ToString() + "x" + posY.ToString() + "; SS = " + squareSize.ToString() + "; MST = " + startTime.ToString("0.000") + "; Time = " + time.ToString() + phase.ToString(".0000") + "; progress = " + progress.ToString("0.000") + "; step = " + step.ToString() + "; TimeMovementEnd = " + UI.MovementEndTime.ToString()); The body of the procedure Debugger.WriteLine is compiled only in Debug mode (directives #if, #endif). What makes me worry is that I often need ToString() in Debugger.WriteLine call which is costly because it creates still new strings (for changing number for example). How to solve this problem? A few points/questions about debugging/tracing: I don't want to wrap every Debugger.WriteLine in an IF statement or to use preprocessor directives in order to leave out debugging methods because it would inevitable lead to a not very readable code and it requires too much typing. I don't want to use any framework for tracing/debugging. I want to try to program it myself. Are Trace methods (http://msdn.microsoft.com/en-us/library/system.diagnostics.trace.aspx) left out if compiling in release mode? If it is so is it possible that my methods would behave similarly? http://msdn.microsoft.com/en-us/library/fht0f5be.aspx output = String.Format("You are now {0} years old.", years); Which seems nice. Is it a solution for my problem with ToString()?

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  • visual studio attaching to a process in debug mode

    - by user1612986
    i have a strange problem. the dll that i built (lets call it my.dll) in c++ visual studio 2010 uses a third party library (say tp.lib) which in turn calls a third party dll (say tp.dll). for debugging prupose i have in configurationProperties-debugging-command: Excel.exe and configurationProperties-debugging-commandArguments: "$(TargetPath)" in my computer i also set PATH variable to the directory where tp.dll resides now when i hit the F5 in visual studio excel opens up with my.dll and crashes giving me a "cannot open in dos mode" error. the reason this happens is tp.dll is not deployed when debug version of my.dll is deployed. when i open an instance of excel seperately and manually drop the debug version of my.dll then everything works fine and i can see all my functions that i wrote in my.dll the only issue is now i do not know how to debug becuase i do not know how to attach visual studio to the instance of excel i opened up seperately. my question is: 1 how can i attach visual studio to an already opened instance of Excel or 2 how can i hit F5 and still make Excel pick up the required tp.dll from the directory specified in the PATH variable before it starts to deploy my.dll. any of these two will allow my to step through the code for the purpose of debugging. thanks in advance.

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  • Visual Studio Debugging Issue

    - by Aaron M
    Seeing an issue when debugging in Visual Studio. All of the values under watch, and in the hover over window show up incorrectly. the only values that show properly, are values that are local to the method I am currently stepping through. For example the watch value for 'this' when debugging shows the following under value 0x00000000ffac0388 { btnBack=0x00000000ffaccf20 btnReply=0x00000000ffacd200 btnForward=0x00000000ffacd420...} some other variables show this, even though the variable is there. error: 'this.foo' does not exist The machine recently had windows 7 64 installed, since then this problem has occured. Visual studio has been reinstalled on this machine, and we verified that the settings in visual studio were exactly the same as a different PC that is the same machine and config.

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  • Dealing with unwanted port numbers on localhost when debugging in Visual Studio

    - by Dan Bailiff
    So when I'm trying to debug a project in Visual Studio, I'll often have 1 or more services that I need to call. These services are separate projects and I'll launch them in separate instances of VS. ASP dev server kindly launches them with temporary port numbers attached. This would be fine except for my programs are looking for an IP without a port attached. (Typically it's as simple as "localhost"!) I've coped by using web config settings and changing the xml to use the port number while debugging. This still doesn't always work and occasionally I'll still have to fudge it and insert port numbers as strings in code! UGH! Then I have to remember to undo all the port herding code before deployment... I want to stop doing this: string _strBaseURL = String.Format("http://{0}:2277", ConfigurationManager.AppSettings["myservice_ip"].ToString()); What is the best practice here? Am I doomed to port herding while debugging VS apps?

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  • Application Runs when Debugging but not when Published.

    - by corymathews
    When publishing my web application and then running it will return the error "Could not load file or assembly 'BaseApplicationName' or one of its dependencies. An attempt was made to load a program with an incorrect format." However if I run the application through debugging (f5) it runs correctly. I guess what it comes down to is what differences are there when running an application through debugging vs publishing it that would cause a problem like this? When publising I have it set to delete all existing. History of how it started... I added the 32 bit Oracle.DataAccess dll to my 64 bit system. It would not work and crash giving the same error as above but with the Oracle.DataAccess name instead of the baseApplicationName. I have since removed all references to it and removed the dll to try and get it to run without it once again. Any advice?

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  • NHibernate very slow during debugging

    - by HeavyWave
    Have anyone stumbled upon a problem where NHibernate is extremely slow in Visual Studio while debugging, but behaves normally when run separately? Logging is disabled and the time lost seems to be when the actual queries are executed, NHProfiler shows that queries were executed very quickly (on SQL side I presume), but each session with 10 queries takes about 4 seconds. I am using SQL Express Server. As I said, even if I turn on full logging and run my application without Visual Studio it is a magnitude faster. Update. After hours and hours of work towards the issue I was able to fix it by simply switching project type from Windows Application to Console Application (although in reality it's a Windows Service, but it always worked before with Windows Application project type). What could possibly be the difference to bring NHibernate to a halt in debugging mode?

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  • VS 2008 unstable after "Stop Debugging"

    - by liys
    This was on Windows Server 2003 X86, VSTS 9.0.30729.1 SP I used "Attach to process" to debug the program, but recently when I "Stop Debugging" by "shift + f5", I was prompted with an error saying "VS has an internal error and will be unstable". After that all the debug related menu items were disabled e.g. "Start debugging" and "attach to process" etc., even when I forcibly closed the program the situation remained, leaving me the only option to restart the solution. The only reason I can think of causing this is that I forcibly kill the process a lot, in order to able to rebuild it quickly, other than that I didn't do anything abnormal to VS. another sympton: when I tried to close the VS normally, I was prompted with "source file [] does not belong to the project being debugged" for all the files I opened inside of IDE, but the file does belong to the project. Thanks for any reply.

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  • Silverlight debugging, no list element view

    - by Snake
    When I'm debugging my Silverlight Appliction and I'm using a list internally I cannot hover over the list and see the items inside the list. I just see the RAW view of the list. If I want to see the items I have to write my own code which is tedious. Is this something normal to Silverlight? I DO have the correct list view when debugging in normal Console/WPF/... applications. Example: Silverlight: (link: click) See how there is no 'list view in the first example? And there in this one: And for non Silverlight: (link: click)

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  • Visual Studio ignore try catch - debug only

    - by Praesagus
    I think error handling is a good idea. :) When debugging it can get in the way - especially with nice user friendly messages. In VB6 I could just check a box for the compiler to ignore my error handling. I found the dialog that allows me to do something similar in VS, but it's about 10,000 check boxes instead of one - which is too many to change every time I want a production compilation. Is there a way to set VS up so when I am in debugging mode I get one set of conditions and when I am in production I get another? ...or is there just another method to handling errors and debugging more efficiently? Thanks

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  • What useful GDB scripts have you used/written?

    - by nik
    People use gdb on and off for debugging, of course there are lots of other debugging tools across the varied OSes, with and without GUI and, maybe other fancy IDE features. I would like to know what useful gdb scripts you have written and liked. While, I do not mean a dump of commands in a something.gdb file that you source to pull out a bunch of data, if that made your day, go ahead and talk about it. Lets think conditional processing, control loops and functions written for more elegant and refined programming to debug and, maybe even for whitebox testing Things get interesting when you start debugging remote systems (say, over a serial/ethernet interface) And, what if the target is a multi-processor (and, multithreaded) system Let me put a simple case as an example... Say, A script that traversed serially over entries to locate a bad entry in a large hash-table that is implemented on an embedded platform. That helped me debug a broken hash-table once.

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  • Python: Getting the attribute name that the created object will be given

    - by cool-RR
    Before I ask this, do note: I want this for debugging purposes. I know that this is going to be some bad black magic, but I want to use it just during debugging so I could identify my objects more easily. It's like this. I have some object from class A that creates a few B instances as attributes: class A(object): def __init__(self) self.vanilla_b = B() self.chocolate_b = B() class B(object): def __init__(self): # ... What I want is that in B.__init__, it will figure out the "vanilla_b" or whatever attribute name it was given, and then put that as the .name attribute to this specific B. Then in debugging when I see some B object floating around, I could know which one it is. Is there any way to do this?

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  • How to make pdb recognize that the source has changed between runs?

    - by user88028
    From what I can tell, pdb does not recognize when the source code has changed between "runs". That is, if I'm debugging, notice a bug, fix that bug, and rerun the program in pdb (i.e. without exiting pdb), pdb will not recompile the code. I'll still be debugging the old version of the code, even if pdb lists the new source code. So, does pdb not update the compiled code as the source changes? If not, is there a way to make it do so? I'd like to be able to stay in a single pdb session in order to keep my breakpoints and such. FWIW, gdb will notice when the program it's debugging changes underneath it, though only on a restart of that program. This is the behavior I'm trying to replicate in pdb.

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  • How to debug a website while running IIS 7?

    - by chobo2
    Hi I am running iis7 on my windows machine for testing purposes. Now I need to have access to the debugger so when something happens I can walk through it. Yet when I put debug lines on my site nothing happens. So I am guessing I need more stuff setup to make debugging to work. Everything is on the same machine. I have iis 7 on the same machine setup and I have Visual studios setup on my machine.

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  • See full HTTP traffic in Tomcat logs

    - by maayank
    For debugging purposes, I need a way to see all HTTP traffic between our Tomcat installation and the test clients. How can I configure Tomcat to trace all HTTP traffic (and not just the headers)? We tried to sniff the traffic using Wireshark, but since the server and the clients are on the same Windows machine it proved problematic, due to the traffic being in localhost.

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  • Visual Studio not auto-building when I press the debug button

    - by Kurru
    Hi I'm writing code in Visual Studio but whenever I want to test the application and press the green arrow for "Start debugging", Visual Studio does not automatically recompile the active solution for me and I have to manually build the solution then debug it. Visual Studio used to automatically build before debug and I want this back as contantly having to manually build is a serious pain. Thanks

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  • Debugging UI Problems in IE8 (Was IE8 on Windows 7 Authentication Mess)

    - by alharaka
    UPDATE: I think the real question I need to ask here is: how does a technician debug UI problems with Internet Explorer, and not HTML rendering issues that have pretty good tools? I am aware of the SysInternals tools and others mentioned below, but maybe I am not harnessing their power properly. Someone else in the TechNet forum I mentioned had a similar issue. Again, I have lots of data, I am not sure how to properly interpret it. ORIGINAL POST: So I tried the venerable Technet Forums to solve this isse. In short, the Windows Security dialog has no place to put credentials, rendering pretty much useless. This happens to apply for a whole bunch of our intranet websites, and only a select number of users with a few laptops have this problem. It ends up looking like this. Things I have tried so far: Disabling local Group Policy (not domain connected) Disabling local Security Policy Resetting IE settings A few system restores Re-registering a bunch of IE DLL's and all other steps here Reinstalling IE8 (dism /online /disable-feature /featurename:"internet-explorer-optional-x86, reboot, dism /online /enable-feature /featurename:"internet-explorer-optional-x86, and reboot) And SFC scan, which found nothing Still, nothing. Not only am I fed up, but I have begun to really work with APIExplorer and Procmon as mentioned in the Technet original because I want to know WHAT is happening, not just fix it. Any thoughts?

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  • Debugging UI Problems in IE8 (Was IE8 on Windows 7 Authentication Mess)

    - by alharaka
    UPDATE: I think the real question I need to ask here is: how does a technician debug UI problems with Internet Explorer, and not HTML rendering issues that have pretty good tools? I am aware of the SysInternals tools and others mentioned below, but maybe I am not harnessing their power properly. Someone else in the TechNet forum I mentioned had a similar issue. Again, I have lots of data, I am not sure how to properly interpret it. ORIGINAL POST: So I tried the venerable Technet Forums to solve this isse. In short, the Windows Security dialog has no place to put credentials, rendering pretty much useless. This happens to apply for a whole bunch of our intranet websites, and only a select number of users with a few laptops have this problem. It ends up looking like this. Things I have tried so far: Disabling local Group Policy (not domain connected) Disabling local Security Policy Resetting IE settings A few system restores Re-registering a bunch of IE DLL's and all other steps here Reinstalling IE8 (dism /online /disable-feature /featurename:"internet-explorer-optional-x86, reboot, dism /online /enable-feature /featurename:"internet-explorer-optional-x86, and reboot) And SFC scan, which found nothing Still, nothing. Not only am I fed up, but I have begun to really work with APIExplorer and Procmon as mentioned in the Technet original because I want to know WHAT is happening, not just fix it. Any thoughts?

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  • pam debugging "check pass; user unknown"

    - by lvc
    I am attempting to get Prosody authenticating with its auth_pam module. It is configured to use the pam service name xmpp. The pam.d/xmpp file is copied straight from the one configured for dovecot (originally taken from, I think, dovecot's documentation), which is known to be working: # cat /etc/pam.d/xmpp auth required pam_unix.so nullok debug account required pam_unix.so debug Logging in with dovecot works wonderfully. Logging in with prosody, with exactly the same username and password, causes Prosody to return 'Not authorized', and the following in journalctl -f: Oct 29 22:12:14 riscque.net prosody[9396]: c2s1d010b0: Client sent opening <stream:stream> to riscque.net Oct 29 22:12:14 riscque.net prosody[9396]: c2s1d010b0: Sent reply <stream:stream> to client Oct 29 22:12:14 riscque.net prosody[9396]: [178B blob data] Oct 29 22:12:14 riscque.net unix_chkpwd[9408]: check pass; user unknown Oct 29 22:12:14 riscque.net prosody[9396]: pam_unix(xmpp:auth): conversation failed Oct 29 22:12:14 riscque.net prosody[9396]: pam_unix(xmpp:auth): unable to obtain a password Oct 29 22:12:14 riscque.net prosody[9396]: pam_unix(xmpp:auth): auth could not identify password for [lvc] Oct 29 22:12:14 riscque.net prosody[9396]: riscque.net:saslauth: sasl reply: <failure xmlns='urn:ietf:params:xml:ns:xmpp-sasl'><not-authorized/><text>Unable to authorize you with the authentication credentials you&apos;ve sent.</text></failure> This series of errors seems mutually contradictory - first it says "user unknown", but then that it can't obtain the password for lvc - this username certainly exists on the system. What is likely going on here, and how would I debug this further?

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  • Simple recursive DNS resolver for debugging (app or VM)

    - by notpeter
    I have an issue which I believe is caused by incorrect DNS queries (doubled subdomains like _record.host.subdomain.tld.subdomain.tld) when querying for SRV records. So I need to an alternate DNS server with heavy logging so I can see every query (especially stupid ones), acting as a recursive resolver with the ability create records which override real DNS records so I can not only find the records it's (wrongly) looking for, but populate those records as well. I know I could install a DNS server on yet another linux box, but I feel like this is the sort of thing that someone may already setup a simple python script or single use vm just for this purpose.

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