Debugging is the process of examining the state of a program - generally with a debugging tool - while it is running and attempting to find bugs that cause it to behave abnormally.

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Debugging xml and annotations

By now, most web containers have an annotation variant of their xml configurations for Java EE. I'm guessing this is because it's better to keep things in Java where they can be managed, coded with ...
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12answers
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Is it significantly costlier to fix a bug at the end of the project?

In a blog post by Andrew Hay, the following axiom was posited: It costs significantly more to fix a bug at the end of the project that it does to fix the same bug earlier in the project. ...
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2answers
76 views

Managing scaffolding for debug vs production builds

The more I program the more I realize that most of my time is spent writing scaffolding for programs so that I can debug them and then strip away the scaffolding for production. The problem is that ...
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4answers
886 views

Debugging memory corruption

First off, I do realize this is not a perfect q&a style question with an absolute answer, but I can't think of any wording to make it work better. I don't think there is an absolute solution to ...
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3answers
189 views

How do you debug a complex application? [closed]

I have an application that is returning the wrong output, when it is run with a particular input choice. I haven't been able to get anywhere near a diagnosis of the fault, despite spending about a ...
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2answers
536 views

Is it possible to prune the stacktrace returned for a custom exception in PHP

I am working on a project in PHP that does a lot of input validation and can throw different custom exception classes in various layers of the application. To make the project code easier to read, ...
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0answers
249 views

Way to toggle debugging code on and off [migrated]

I was programming a manchester decoding algorithm for arduino, and I often had to print debug stuff when trying to get things working, but printing to serial and string constants add a lot of ...
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0answers
28 views

How to test random numbers? [migrated]

Something is wrong with this PRNG, it uses a large (65536 bit) pool of bits from which randomness is extracted in sets of 256 bits, what seems to fail is the bit storage feature (ests,sts,lts,elts) ...
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4answers
334 views

Pesky bugs - nonexistant?

Very short introduction (this is quite a context-heavy question): I'm a 17 year old programmer, doing some projects, usually netting around 20 files of 200 lines each. I usually don't program very ...
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3answers
143 views

Who fixes bugs in a team? [duplicate]

In an agile software development team, who would be the one to fix the bugs introduced in an update? The developer who writes the feature? Someone else specialized specifically in debugging with a ...
194
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20answers
27k views

Leaving intentional bugs in code for testers to find

We don't do this at our firm, but one of my friends says that his project manager asked every dev to add intentional bugs just before the product goes to QA. This is how it works: Just before the ...
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7answers
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What's the best way to avoid catastrophe caused by negligence? [duplicate]

I have been a programmer for almost 1 year. As an ADHD adult, naturally I don't have the same strength of attention on ordinary stuffs as my colleagues do. And I find the catastrophe made by me are ...
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3answers
3k views

What is the term for a 'decoy' feature or intentional bug? [closed]

I have forgotten a slang programming term. This thing is an intentional bug or a decoy feature used as a distraction. An example usage, "Hey Bob, QA is doing a review today. Put a $THING into the ...
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2answers
35 views

How do we sequence logs from different services in a system?

So, if I am designing a system as a set of different roles (client, app-server, backend services 1 to n). Each of these roles will have their own logging mechanism. I can aggregate all the logs at one ...
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5answers
391 views

Tips for debugging with very little info? [closed]

I've inherited a project with a fairly large codebase, and the original developer rarely, if ever, replies to emails. There's a ton of different ways to do some things in it, and I don't know all of ...
26
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13answers
2k views

Does the use of debuggers have an effect on the efficiency of programmers? [duplicate]

Possible Duplicate: Are debugging skills important to become a good programmer? I'm a young Java developer and I make a systematic use of the Netbeans debugger. In fact, I often develop my ...
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1answer
34 views

Difficulty translating specs into rending HTML/CSS [closed]

Our small shop excels at data modeling and algorithms, but we increasingly face challenges getting the presentation and rendering correct. I would like others to explain to me which strategies are ...
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0answers
55 views

Curiosity: Unassembled asm in Windows Bootloader

I found this little gem waiting for me in the Windows (10/TP) bootmgr located on the first 300+- MB partition. Can anyone explain to me what it does? Is there an assembler hidden somewhere? These all ...
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8answers
8k views

How to most effectively debug code? [closed]

Bugs creeping into code can be minimized, but not entirely eliminated as it is written - programmers are, although many would disagree, only humans. When we do detect an error in our code, what can ...
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5answers
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Why is reverse debugging rarely used?

gdb implemented support for reverse debugging in 2009 (with gdb 7.0). I never heard about it until 2012. Now I find it extremely useful for certain types of debugging problems. I wished that I heard ...
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5answers
237 views

Correctly disposing objects upon server termination

I am working on a large C++ project. It consists in a server that exposes a REST API, providing a simple and user-friendly interface for a very broad system comprising many other servers. The codebase ...
12
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5answers
591 views

How can I encourage people to read error messages? [duplicate]

I was wondering if there are some good ways to encourage people to read error messages when the compilation fails. People (especially) the junior ones usually ignore the error messages and just ask ...
16
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10answers
1k views

Why not use the word bug instead of exception? [closed]

If we refer to exceptions as bugs, why not just call it a bug in the first place instead of an exception? If in the code it's called exception and as soon as it occurs it's called a bug. Then why not ...
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20answers
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How do you tackle really bizarre errors that keep you puzzled for more than 10 hours? [closed]

You know them, those errors that make NO sense. Where it seems like a gremlin just jumped deep inside your chips and messed up something. Do you take a walk, write stuff, call an uncle?
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8answers
504 views

Bug fixing approach

I have been working on a database project, and I recently received a bug report for the remote execution of some queries. Usually, you try to find out the actual cause for the bug to occur and then ...
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1answer
74 views

Is software inherently buggy and hence, vulnerable? [duplicate]

Could no amount of formal analysis, type/rule checking prevent it's exploitation? How about a fully verified kernel such as SEL4 ?
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6answers
524 views

When should you start unit testing? (during which development stage?)

I'm currently learning about unit testing, specifically JUnit (with Java). Searching the web I see many threads talking about why you should use it, what type of methods you should use it with but I ...
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1answer
175 views

How to debug minified javascript on production? [closed]

I have a front end single page app deployed on S3. It is minified on production. It creates error only when it is minified via grunt on production. I cannot repro the issue in dev. How do I go about ...
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10answers
950 views

Why do new programmers seem to ignore compiler error messages/runtime exception messages? [closed]

I think we’ve all seen this. Beginners ask questions on Stack Overflow that follow the basic outline... I’m trying to do (very vague description of the goal) but it doesn’t work/I get an ...
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12answers
2k views

Is it possible to speed-read code well? [closed]

Sometimes we have huge code listings to deal with, and I'm curious as to how the advanced, highly skilled programmers read code. And I'll say with an emphasis on debugging and finding issues.
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2answers
335 views

How to avoid long call chains?

I have a hierarchy of objects, mostly connected by composition. I.e. (not showing the class methods for readability): class A {} class B {A a;} class C {B b;} etc... class Z {Y y;} class Z provides ...
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6answers
1k views

What is the actual reason that locks (sentinels) in OO are hard to reason about? [closed]

In this talk, Rich Hickey introduces Clojure. He gives an Ants demo and talks about his motivations for implementing a Software Transactional Memory (STM) system. His reasoning for STM is that ...
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1answer
84 views

Extending a class for debugging: public API, hidden implementation or something else?

I'm working on a fairly large project that involves 3D drawing, and I want to add some visualizers (for example, to see the bounding boxes of the objects) to make debugging easier. However, I'm having ...
55
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21answers
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“It was working yesterday, I swear!” What can you do? [closed]

When you arrive in the morning, you find that your software does not work anymore, even though it did when you left yesterday evening. What do you do? What do you check first? What do you do to stop ...
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2answers
79 views

Debug symbols change application execution [closed]

I have to set up remote debugging for a multi threaded application running on a embedded device. C++ is the language. I've gotten so far and got the remote debugging working for a simple application, ...
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1answer
240 views

Writing software without unit testing

Usually, when I write software, I use unit tests for each function to test if it is working without any problems. However, recently I have found myself writing some software that are not really ...
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1answer
286 views

Illustrate Meaning of : gcc -g programName.c

To debug a C program using gdb effectively it is required to compile it first using the command: gcc -g programName.c otherwise on using simply gcc programName.c and running we are unable to ...
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2answers
121 views

can a logic error happen way later than its cause? [closed]

For comparison, for a runtime fatal error, it is often that the cause of the error is way before the error crashes a program. For a logic error, it doesn't crash a program. It happens when the state ...
3
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1answer
144 views

Android testing - bugs not reproducible [duplicate]

We have the following problem: at the end of the iteration we give our Android app to our customers to test. Our customers report bugs that are not reproducible on our test devices. How can we deal ...
3
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4answers
131 views

What is your approach to debugging a transient problem [closed]

I am working on a system that controls a label printer and occasionally the label printer will print the same label 2,3,...,10 times. The error is transient, occurring once per 3000-4000 (once a ...
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3answers
340 views

Declaring variables in Python and PHP

The question is how to cope with absence of variable declaration in Python, PHP, and the like. In most languages there is a way to let the compiler know whether I introduce a new variable or refer to ...
4
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3answers
159 views

How do I fix an “emergent” bug?

I'm writing a PDE solver, and I have a bug that only shows up in very large test cases. That is, with small grids the program gives correct answers, but there's a large amount of unaccounted-for error ...
19
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4answers
9k views

What is the correct way to handle debug output in Java?

As my current Java projects grow bigger and bigger, I feel a likewise growing need to insert debug output in several points of my code. To enable or disable this feature appropriately, depending on ...
55
votes
14answers
4k views

Is it reasonable to insist on reproducing every defect before diagnosing and fixing it?

I work for a software product company. We have large enterprise customers who implement our product and we provide support to them. For example, if there is a defect, we provide patches, etc. In other ...
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votes
5answers
2k views

What is a practical way to debug Rails?

I get the impression that in practice, debuggers are rarely used for Rails applications. (Likewise for other Ruby apps, as well as Python.) We can compare this to the usual practice for Java or ...
2
votes
2answers
86 views

Does anyone still use logic analyzers for debugging real time systems?

Many years ago when debugging real time systems (such as the ones used in telephone switches) we had to use logic analyzers (which read execution straight from the CPU) or emulators (which physically ...
2
votes
2answers
58 views

Methodology To Determine Cause Of User Specific Error

We have software that for certain clients fails to download a file. The software is developed in Python and compiled into an Windows Executable. The cause of the error is still unknown but we have ...
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4answers
316 views

Why do browsers these days ship with dev tools [closed]

I just read a question asking how Facebook blocks console-based script attacks. The reason for this block was to prevent a recently famous "hack" where one would trick a user to inject a malicious ...
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5answers
845 views

Learning to investigate bugs [closed]

I'm not even sure how to define this difficulty. It reminds me of the test a couple of prospective employees did on me before I got a job. They would pick an object in the room and then I'd be allowed ...
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8answers
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How should one debug a PHP web application securely without exposing secrets to competitors?

Recently I made a program. I forget to delete 2 line of codes. That mistake cost me $800 per day every day. I was programming with PHP. If a visitor uses proxy it redirect somewhere else. Using ...