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• Google Maps mashup for notes/househunting

  - by afray

  I'm house-hunting at the moment and I'm trying to geek it out er I mean streamline the decision-making process. I'm currently using google maps's "my maps" feature to store pins to properties. I create one map per estate agent, then put relevant into into the individual pins. The idea being, I can look at the map and quickly choose which property to view next. However the pins don't currently link back to the map they're owned by, so you have to hunt a bit to get the estate agent info, it's a hassle to get all maps displayed in a new session if you have lots of agents, and each pin doesn't automatically show its bubble so you have to do lots of clicking to see all the info you want. I've tried Evernote, but despite its tag system initially showing some promise, I can't find a way to seemlessly integrate maps. A few google searches don't turn anything up either. Even the big sites, like http://www.rightmove.co.uk, don't seem to provide any maps integration by default. You can see an individual house's location, but not all results of a search. So is there a web site or windows program I could use to do something like this? Viewing all properties on a map is a must, as is quick access to contact details.

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• How to limit disk performance?

  - by DrakeES

  I am load-testing a web application and studying the impact of some config tweaks (related to disk i/o) on the overall app performance, i.e. the amount of users that can be handled simultaneously. But the problem is that I hit 100% CPU before I can see any effect of the disk-related config settings. I am therefore wondering if there is a way I could deliberately limit the disk performance so that it becomes the bottleneck and the tweaks I am trying to play with actually start impacting performance. Should I just make the hard disk busy with something else? What would serve the best for this purpose? More details (probably irrelevant, but anyway): PHP/Magento/Apache, studying the impact of apc.stat. Setting it to 0 makes APC not checking PHP scripts for modification which should increase performance where disk is the bottleneck. Using JMeter for benchmarking.

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• Good C++ books regarding Performance?

  - by Leon

  Besides the books everyone knows about, like Meyer's 3 Effective C++/STL books, are there any other really good C++ books specifically aimed towards performance code? Maybe this is for gaming, telecommunications, finance/high frequency etc? When I say performance I mean things where a normal C++ book wouldnt bother advising because the gain in performance isn't worthwhile for 95% of C++ developers. Maybe suggestions like avoiding virtual pointers, going into great depth about inlining etc? A book going into great depth on C++ memory allocation or multithreading performance would obviously be very useful.

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• IIS 7 AppPool logs an error after recycle due to inactivity

  - by ddysart

  We have Windows 2008 RS Server running IIS hosting an ASP.NET site. This morning there was a weird sequence. First a notice that the AppPool was being recycled due to inactivity: "A worker process with process id of '6896' serving application pool 'xxxx' was shutdown due to inactivity. Application Pool timeout configuration was set to 20 minutes. A new worker process will be started when needed." This makes sense and jibes with out timeout settings, but 30 seconds later we see: "A process serving application pool 'xxxx' terminated unexpectedly. The process id was '6896'. The process exit code was '0xc0000005'." I found an older KB article that explains a condition where this might happend on IIS6 due to permission issues, but am curious what might cause this on IIS7.5, especially since we are not seeing it regularly.

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• Solution to time shifting requirement in Active Directory

  - by MikeR

  Hi, I currently have an active directory that has several child domains (consisting of nothing other than a DC and bespoke application servers) set-up for testing our CRM software, as some of it is date/time sensitive these have been set to dates in the future at some point in the past, which is causing replication errors. I'm working on getting rid of these child domains, but still have a requirement for our testers to be able to time shift. Does anyone know of any solutions that would allow our test environments to have their time changed (always forward), without affecting the production active directory? Is it as simple as creating a separate Forest on the same LAN or would that interfere with my production Forest? Thanks for any advice.

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• I want to plot ocean current with a GPS in a bottle.

  - by Fantomas

  Thinking of using a wine bottle with a cork that barely sticks out. Anyhow, I want to put in a GPS, a battery and a transmitter and to be able to collect position about every minute or so. Off-the-shelf components are preferred. What are my options as far as hardware and software choices? Thank you in advance!

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• Is there any software or hardware which lets you stop, slow down, speed up or even reverse time?

  - by tjrobinson

  Obviously I'm talking about time in terms of the PC clock rather than real time. We were testing an application we've developed at work by setting the clock forward and back to simulate different scenarios and I started thinking how useful it would be if you could adjust the rate(?) of the system clock with finer control. So you could make a minute pass in a second or a day pass in 30 seconds and watch how the program you're developing copes with changes in date and time. I'd be interested to hear if anyone knows of any software or hardware which can let you do some or all of the above.

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• Domino 8.5.3: Attaching an Object Residing on Server (Lotusscript preferred)

  - by Void

  Not sure if this question is more appropriate for ServerFault or StackOverflow, sorry if it should belong elsewhere! I am working on an application and one of the function is to automatically send an email with an attachment. I can code the application to attach the object when it resides on local or on a mapped drive. Newbie Question: Is there a way to have the object reside on the Domino server, and still be able to point to it and have the application automatically attach and send? Is there any method that allows me to do this? Users have no direct access to the server/filesystem, so mapped drive of the Domino server is out of the question. Hope someone can shed some light on this question. Thanks!

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• Kill program after it outputs a given line, from a shell script

  - by Paul

  Background: I am writing a test script for a piece of computational biology software. The software I am testing can take days or even weeks to run, so it has a recover functionality built in, in the case of system crashes or power failures. I am trying to figure out how to test the recovery system. Specifically, I can't figure out a way to "crash" the program in a controlled manner. I was thinking of somehow timing a SIGKILL instruction to run after some amount of time. This is probably not ideal, as the test case isn't guaranteed to run the same speed every time (it runs in a shared environment), so comparing the logs to desired output would be difficult. This software DOES print a line for each section of analysis it completes. Question: I was wondering if there was a good/elegant way (in a shell script) to capture output from a program and then kill the program when a given line/# of lines is output by the program?

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• Can we execute steps conditionally in a JMeter script?

  - by Phanindra K

  I have recorded a sequence of steps to be executed for testing my web application, in a JMeter .jmx script. (The recording tool used was BadBoy). It is possible that one of the steps might return an error response in the HTTP response content. In this case, I need the script to stop execution of that thread. However, since the error page is customized, JMeter does not recognize this as an error and proceeds to the next steps. Is there any way to check for certain keywords, for example, and decide if the response is an error?

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• macports apache,php,db, how do I test on another device?

  - by brokenindexfinger

  My supervisor suggests using macports to install/manage different versions of apache and php, as well as both mysql and posgres databases. The idea is that we need to test our platform on different versions of each. So far I've just been using the default apache installation on osx lion, and the default postgres installation. My question is this: once I turn Web Sharing off, and proceed with a custom apache2 setup based in /opt/local/, how do I broadcast my machine's IP to other devices, for testing? With Web Sharing, I can get my machine's IP and use that to test with an iPad and iPhone. Will that still be the case, and if so, how do I do it?

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• How do i keep a newly started program from taking focus?

  - by Jugglingnutcase

  Say i'm coding in emacs and want to start up a music program. Because it takes too long to start up i go back to coding and type away. When the music application starts up, the focus is stolen (gasp! stolen!) away from emacs and goes to the music application, often mid-thought. Is there any way to keep this from happening and have the newly started application not have focus until i see that it's up and ready to be used? Besides getting rid of my ADD of course. Or getting an impossibly fast computer that can keep up with my mind. i'm using a Windows XP system, but i will soon have a Windows 7 system, and i have Linux at home.

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• How can I access a shared Exchange mailbox with IMAP (over telnet)?

  - by gauteh

  I have an Mailbox which multiple users have access to, it works fine for me and I can add it in Outlook as an additional mailbox to my account and list all its content. I can access my personal mailbox using IMAP, I'm testing it by just telneting in and LIST'ing it. The problem is that another user trying to access it is having problems accessing it through IMAP; and I want to test if I can access the shared mailbox with my account - how can I do that in terms of IMAP commands? What I am doing now is: telnet mail.server 01 LOGIN user pass 02 LIST "" * 03 LOGOUT Edit: If there is another way to test this, that is an equally good answer.

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• Application Lifecycle Management Tools

  - by John K. Hines

  Leading a team comprised of three former teams means that we have three of everything.  Three places to gather requirements, three (actually eight or nine) places for customers to submit support requests, three places to plan and track work. We’ve been looking into tools that combine these features into a single product.  Not just Agile planning tools, but those that allow us to look in a single place for requirements, work items, and reports. One of the interesting choices is Software Planner by Automated QA (the makers of Test Complete).  It's a lovely tool with real end-to-end process support.  We’re probably not going to use it for one reason – cost.  I’m sure our company could get a discount, but it’s on a concurrent user license that isn’t cheap for a large number of users.  Some initial guesswork had us paying over $6,000 for 3 concurrent users just to get started with the Enterprise version.  Still, it’s intuitive, has great Agile capabilities, and has a reputation for excellent customer support. At the moment we’re digging deeper into Rational Team Concert by IBM.  Reading the docs on this product makes me want to submit my resume to Big Blue.  Not only does RTC integrate everything we need, but it’s free for up to 10 developers.  It has beautiful support for all phases of Scrum.  We’re going to bring the sales representative in for a demo. This marks one of the few times that we’re trying to resist the temptation to write our own tool.  And I think this is the first time that something so complex may actually be capably provided by an external source.   Hooray for less work! Technorati tags: Scrum Scrum Tools

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• Designing a Database Application with OOP

  - by Tim C

  I often develop SQL database applications using Linq, and my methodology is to build model classes to represent each table, and each table that needs inserting or updating gets a Save() method (which either does an InsertOnSubmit() or SubmitChanges(), depending on the state of the object). Often, when I need to represent a collection of records, I'll create a class that inherits from a List-like object of the atomic class. ex. public class CustomerCollection : CoreCollection<Customer> { } Recently, I was working on an application where end-users were experiencing slowness, where each of the objects needed to be saved to the database if they met a certain criteria. My Save() method was slow, presumably because I was making all kinds of round-trips to the server, and calling DataContext.SubmitChanges() after each atomic save. So, the code might have looked something like this foreach(Customer c in customerCollection) { if(c.ShouldSave()) { c.Save(); } } I worked through multiple strategies to optimize, but ultimately settled on passing a big string of data to a SQL stored procedure, where the string has all the data that represents the records I was working with - it might look something like this: CustomerID:34567;CurrentAddress:23 3rd St;CustomerID:23456;CurrentAddress:123 4th St So, SQL server parses the string, performs the logic to determine appropriateness of save, and then Inserts, Updates, or Ignores. With C#/Linq doing this work, it saved 5-10 records / s. When SQL does it, I get 100 records / s, so there is no denying the Stored Proc is more efficient; however, I hate the solution because it doesn't seem nearly as clean or safe. My real concern is that I don't have any better solutions that hold a candle to the performance of the stored proc solution. Am I doing something obviously wrong in how I'm thinking about designing database applications? Are there better ways of designing database applications?

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• Technology Choice for a Client Application [on hold]

  - by AK_

  Not sure this is the right place to ask... I'm involved in the development of a new system, and now we are passing the demos stage. We need to build a proper client application. The platform we care most about is Windows, for now at least, but we would love to support other platforms, as long as it's free :-). Or at least very cheap. We anticipate two kinds of users: Occasional, coming mostly from the web. Professional, who would probably require more features, and better performance, and probably would prefer to see a native client. Our server exposes two APIs: A SOAP API, WCF behind the scenes, that supports 100% of the functionality. A small and very fast UDP + Binary API, that duplicates some of the functionality and is intended for the sake of performance for certain real-time scenarios. Our team is mostly proficient in .Net, C#, C++ development, and rather familiar with Web development (HTML, JavaScript). We are probably intending to develop two clients (for both user profiles), a web app, and a native app. Architecturally, we would like to have as many common components as possible. We would like to have several layers: Communication, Client Model, Client Logic, shared by both of the clients. We would also like to be able to add features to both clients when only the actual UI is a dual cost, and the rest is shared. We are looking at several technologies: WPF + Silverlight, Pure HTML, Flash / Flex (AIR?), Java (JavaFx?), and we are considering poking at WinRT(or whatever the proper name is). The question is which technology would you recommend and why? And which advantages or disadvantages will it have regarding our requirements?

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• Desktop application, dependency injection

  - by liori

  I am thinking of applying a real dependency injection library to my toy C#/GTK# desktop application. I chose NInject, but I think this is irrelevant to my question. There is a database object, a main window and several utility window classes. It's clear that I can inject the database into every window object, so here DI is useful. But does it make sense to inject utility window classes into other window classes? Example: I have classes such as: class MainWindow {…} class AddItemWindow {…} class AddAttachmentWindow {…} class BrowseItemsWindow {…} class QueryBuilderWindow {…} class QueryBrowserWindow {…} class PreferencesWindow {…} … Each of the utility classes can be opened from MainWindow. Some utility windows can also be opened from other utility windows. Generally, there might be a really complex graph of who can open whom. So each of those classes might need quite a lot of other window classes injected. I'm worried that such usage will go against the suggestion not to inject too many classes at once and become a code smell. Should I use some kind of a service locator object here?

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• Should one use a separate database for application data and user data?

  - by trycatch

  I’ve been working on a project for a little while and I’m unsure which is the better architecture. I’m interested in the consensus. The answer to me seems fairly obvious but something about it is digging at me and I can't pick out what. The TL;DR is: how do you handle a program with application data and user data in the same DB which needs to be able to receive updates to the application data periodically? One database for user data and one for application, or both in one? The detailed version is.. if an application has a database which needs to maintain application data AND user data, and the user data all references application data, it feels more natural to me to store them in the same database. But if there exists a need to be able to update the application data within this database periodically, should this be stripped into two databases so that one can simply download the updated application data database file as an update and replace the old one? Or should they remain as one database, and the application data be updated via a script which inserts the new data into the existing database? The second sounds clearly preferable to me... but for some reason just doesn’t feel right, and I can't pick out quite why.

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• Why change from WPF to Silverlight 4?

  - by stiank81

  I'm working on an application we made WPF instead of Silverlight as we wanted a full blown desktop application with the whole unique feeling and advantages that gives. However, with the announcement of Silverlight 4 I hear there is a buzz about Silverlight mostly being the preferred choice also for desktop applications. So; why should I consider moving my WPF application to Silverlight 4 - given that I still want a desktop application?

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• Install Shield 2009 Premier, Uninstall doesn't close the process/gui

  - by Samir

  My application (developed using C#.net) is open now i uninstall, InstallShield gives message stating the application is already open and whether really want to close the application. Selection 'Ignore' continues uninstall. Some files and the exe of the application are not closed. How to close them by installshield on uninstall. Or there are some properties I have to set. I know adding a custom action at uninstall i can kill the process, but shouldn't installshield do it?

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• Command line tool in python in a fixed root directory ...

  - by koleto

  I would like to install my python application as a command line tool that should work entirelly inside the install directory (for example C:\Python26\Lib\site-packages\application) The problem is I would like to reffer in runtime to the submodules and resources from within the application directory three. If I install the app with [console_scripts] option the default path is the current directory. Is there a elegant way to keep the current execution path of the application to the site-packages directory? Thanks

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• Autofac Unit Testing using RegisterControllers()

  - by Kane

  I am having problems using Autofac 2.1.13 and writing my unit tests for my ASP.NET MV2 application. I can't seem to resolve controllers when using the RegisterControllers method. I have tried using the Resolve<() and ControllerBuilder.Current.GetControllerFactory().CreateController() methods but to no avail. I am sure that I've missed something simple here so can anyone assist? This was my first attempt at resolving the HomeController - but does not work. ContainerBuilder builder = new ContainerBuilder(); builder.RegisterControllers(typeof(HomeController).Assembly); IContainer container = builder.Build(); // Throws a Throws a A first chance exception of type 'Autofac.Core.Registration.ComponentNotRegisteredException' occurred in Autofac.dll var homeController = container.Resolve<HomeController>(); Similarly this does not work either. ContainerBuilder builder = new ContainerBuilder(); builder.RegisterControllers(typeof(HomeController).Assembly); IContainer container = builder.Build(); var containerProvider = new ContainerProvider(container); ControllerBuilder.Current.SetControllerFactory(new AutofacControllerFactory(containerProvider)); var request = new Mock<HttpRequestBase>(MockBehavior.Loose); request.Setup(r => r.Path).Returns("Path"); var httpContext = new Mock<HttpContextBase>(MockBehavior.Loose); httpContext.SetupGet(c => c.Request).Returns(request.Object); ControllerBuilder.Current.GetControllerFactory().CreateController(new RequestContext(httpContext.Object, new RouteData()), "home"); Any assistance would be greatly appreciated. I should note if I register my controllers without using the RegisterControllers() method my unit tests work. My question would seem to be limited to specifically using the RegisterControllers() method.

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• career in Mobile sw/Application Development [closed]

  - by pramod

  i m planning to do a course on Wireless & mobile computing.The syllabus are given below.Please check & let me know whether its worth to do.How is the job prospects after that.I m a fresher & from electronic Engg.The modules are- *Wireless and Mobile Computing (WiMC) – Modules* C, C++ Programming and Data Structures 100 Hours C Revision C, C++ programming tools on linux(Vi editor, gdb etc.) OOP concepts Programming constructs Functions Access Specifiers Classes and Objects Overloading Inheritance Polymorphism Templates Data Structures in C++ Arrays, stacks, Queues, Linked Lists( Singly, Doubly, Circular) Trees, Threaded trees, AVL Trees Graphs, Sorting (bubble, Quick, Heap , Merge) System Development Methodology 18 Hours Software life cycle and various life cycle models Project Management Software: A Process Various Phases in s/w Development Risk Analysis and Management Software Quality Assurance Introduction to Coding Standards Software Project Management Testing Strategies and Tactics Project Management and Introduction to Risk Management Java Programming 110 Hours Data Types, Operators and Language Constructs Classes and Objects, Inner Classes and Inheritance Inheritance Interface and Package Exceptions Threads Java.lang Java.util Java.awt Java.io Java.applet Java.swing XML, XSL, DTD Java n/w programming Introduction to servlet Mobile and Wireless Technologies 30 Hours Basics of Wireless Technologies Cellular Communication: Single cell systems, multi-cell systems, frequency reuse, analog cellular systems, digital cellular systems GSM standard: Mobile Station, BTS, BSC, MSC, SMS sever, call processing and protocols CDMA standard: spread spectrum technologies, 2.5G and 3G Systems: HSCSD, GPRS, W-CDMA/UMTS,3GPP and international roaming, Multimedia services CDMA based cellular mobile communication systems Wireless Personal Area Networks: Bluetooth, IEEE 802.11a/b/g standards Mobile Handset Device Interfacing: Data Cables, IrDA, Bluetooth, Touch- Screen Interfacing Wireless Security, Telemetry Java Wireless Programming and Applications Development(J2ME) 100 Hours J2ME Architecture The CLDC and the KVM Tools and Development Process Classification of CLDC Target Devices CLDC Collections API CLDC Streams Model MIDlets MIDlet Lifecycle MIDP Programming MIDP Event Architecture High-Level Event Handling Low-Level Event Handling The CLDC Streams Model The CLDC Networking Package The MIDP Implementation Introduction to WAP, WML Script and XHTML Introduction to Multimedia Messaging Services (MMS) Symbian Programming 60 Hours Symbian OS basics Symbian OS services Symbian OS organization GUI approaches ROM building Debugging Hardware abstraction Base porting Symbian OS reference design porting File systems Overview of Symbian OS Development – DevKits, CustKits and SDKs CodeWarrior Tool Application & UI Development Client Server Framework ECOM STDLIB in Symbian iPhone Programming 80 Hours Introducing iPhone core specifications Understanding iPhone input and output Designing web pages for the iPhone Capturing iPhone events Introducing the webkit CSS transforms transitions and animations Using iUI for web apps Using Canvas for web apps Building web apps with Dashcode Writing Dashcode programs Debugging iPhone web pages SDK programming for web developers An introduction to object-oriented programming Introducing the iPhone OS Using Xcode and Interface builder Programming with the SDK Toolkit OS Concepts & Linux Programming 60 Hours Operating System Concepts What is an OS? Processes Scheduling & Synchronization Memory management Virtual Memory and Paging Linux Architecture Programming in Linux Linux Shell Programming Writing Device Drivers Configuring and Building GNU Cross-tool chain Configuring and Compiling Linux Virtual File System Porting Linux on Target Hardware WinCE.NET and Database Technology 80 Hours Execution Process in .NET Environment Language Interoperability Assemblies Need of C# Operators Namespaces & Assemblies Arrays Preprocessors Delegates and Events Boxing and Unboxing Regular Expression Collections Multithreading Programming Memory Management Exceptions Handling Win Forms Working with database ASP .NET Server Controls and client-side scripts ASP .NET Web Server Controls Validation Controls Principles of database management Need of RDBMS etc Client/Server Computing RDBMS Technologies Codd’s Rules Data Models Normalization Techniques ER Diagrams Data Flow Diagrams Database recovery & backup SQL Android Application 80 Hours Introduction of android Why develop for android Android SDK features Creating android activities Fundamental android UI design Intents, adapters, dialogs Android Technique for saving data Data base in Androids Maps, Geocoding, Location based services Toast, using alarms, Instant messaging Using blue tooth Using Telephony Introducing sensor manager Managing network and wi-fi connection Advanced androids development Linux kernel security Implement AIDL Interface. Project 120 Hours

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• ocunit testing on iPhone

  - by Magnus Poromaa

  Hi I am trying to get ocunit working in my project from XCode. Since I also need to debug in the unit tests I am using a script that automates the setup (see below). I just include it in the project under resources and change the name to the .ocunit file I want it to run. The problem I get is that it cant find the bundle file and therefore exists with an error. Can anyone who has a clue about XCode and objective-c take a look at it and tell me what is wrong. Also how am I supposed to produce the .ocunit file that I need to run. By setting up a new unit test target for the iPhone and add tests to it or? Hope someone has a clue since I just started ny iPhone development and need to get it up and running quickly Apple Script -- The only customized value we need is the name of the test bundle tell me to activate tell application "Xcode" activate set thisProject to project of active project document tell thisProject set testBundleName to name of active target set unitTestExecutable to make new executable at end of executables set name of unitTestExecutable to testBundleName set path of unitTestExecutable to "/Applications/TextEdit.app" tell unitTestExecutable -- Add a "-SenTest All" argument make new launch argument with properties {active:true, name:"-SenTest All"} -- Add the magic set injectValue to "$(BUILT_PRODUCTS_DIR)/" & testBundleName & ".octest" make new environment variable with properties {active:true, name:"XCInjectBundle", value:injectValue} make new environment variable with properties {active:true, name:"XCInjectBundleInto", value:"/Applications/TextEdit.app/Contents/MacOS/TextEdit"} make new environment variable with properties {active:true, name:"DYLD_INSERT_LIBRARIES", value:"$(DEVELOPER_LIBRARY_DIR)/PrivateFrameworks/DevToolsBundleInjection.framework/DevToolsBundleInjection"} make new environment variable with properties {active:true, name:"DYLD_FALLBACK_FRAMEWORK_PATH", value:"$(DEVELOPER_LIBRARY_DIR)/Frameworks"} end tell end tell end tell Cheers Magnus

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• Logging errors caused by exceptions deep in the application

  - by Kaleb Pederson

  What are best-practices for logging deep within an application's source? Is it bad practice to have multiple event log entries for a single error? For example, let's say that I have an ETL system whose transform step involves: a transformer, pipeline, processing algorithm, and processing engine. In brief, the transformer takes in an input file, parses out records, and sends the records through the pipeline. The pipeline aggregates the results of the processing algorithm (which could do serial or parallel processing). The processing algorithm sends each record through one or more processing engines. So, I have at least four levels: Transformer - Pipeline - Algorithm - Engine. My code might then look something like the following: class Transformer { void Process(InputSource input) { try { var inRecords = _parser.Parse(input.Stream); var outRecords = _pipeline.Transform(inRecords); } catch (Exception ex) { var inner = new ProcessException(input, ex); _logger.Error("Unable to parse source " + input.Name, inner); throw inner; } } } class Pipeline { IEnumerable<Result> Transform(IEnumerable<Record> records) { // NOTE: no try/catch as I have no useful information to provide // at this point in the process var results = _algorithm.Process(records); // examine and do useful things with results return results; } } class Algorithm { IEnumerable<Result> Process(IEnumerable<Record> records) { var results = new List<Result>(); foreach (var engine in Engines) { foreach (var record in records) { try { engine.Process(record); } catch (Exception ex) { var inner = new EngineProcessingException(engine, record, ex); _logger.Error("Engine {0} unable to parse record {1}", engine, record); throw inner; } } } } } class Engine { Result Process(Record record) { for (int i=0; i<record.SubRecords.Count; ++i) { try { Validate(record.subRecords[i]); } catch (Exception ex) { var inner = new RecordValidationException(record, i, ex); _logger.Error( "Validation of subrecord {0} failed for record {1}", i, record ); } } } } There's a few important things to notice: A single error at the deepest level causes three log entries (ugly? DOS?) Thrown exceptions contain all important and useful information Logging only happens when failure to do so would cause loss of useful information at a lower level. Thoughts and concerns: I don't like having so many log entries for each error I don't want to lose important, useful data; the exceptions contain all the important but the stacktrace is typically the only thing displayed besides the message. I can log at different levels (e.g., warning, informational) The higher level classes should be completely unaware of the structure of the lower-level exceptions (which may change as the different implementations are replaced). The information available at higher levels should not be passed to the lower levels. So, to restate the main questions: What are best-practices for logging deep within an application's source? Is it bad practice to have multiple event log entries for a single error?

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