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• input file cannot be found

  - by Eric Smith

  I am just messing around with reading input files with java until I got stumped at the most basic of steps... finding the input file! The input.txt file is in the same directory as my class file that is calling it yet eclipse still gives me an error that it cant be found: "Exception in thread "main" java.lang.Error: Unresolved compilation problem: Unhandled exception type FileNotFoundException" My code: package pa; import java.util.Scanner; public class Project { public static void main(String[] args) { java.io.File file = new java.io.File("input.txt"); System.out.println(file.getAbsolutePath()); Scanner input = new Scanner(file); } } input.txt is in the same package, same folder and everything. I'm confused :(

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• Longlasting Macport installation

  - by Werner

  Hi, I use Macports on Mac OSX to install some software. But there are somethings that I find very strange. For instance, yesterday I installed some app. and the it needed to get gcc43 and compile completely from source! It took a lot of time, although now everything works right. I understand that compilation of everything in the gentoo spirit is eomthing nice, but in the Mac case, not necessary. There are ony sole hardware variations, so it will be easier to get the binaries. I wonder if Macporst can be forced to get the binaries when available and therefore avoid these time consuming compilations. Thanks

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• Can't create admin user on Heroku

  - by Nick5a1

  I am new to rails and I have gone through Kevin Skoglund's Ruby on Rails 3 Essential Training course on Lynda.com. Through the course you set up a simple cms, which I did. It doesn't cover Git or deployment but I've pushed my simple cms to github (https://github.com/nick5a1/Simple_CMS) and deployed to Heroku (http://nkarrasch.herokuapp.com/). In order to deploy to Heroku I followed the Heroku setup guide (https://devcenter.heroku.com/articles/rails3) and switched my database from MySQL to PostgreSQL. As instructed I changed gen'mysql2' to gen 'sqlite3' in my Gemfile and ran bundle install before pushing. I then ran heroku run rake db:migrate. I'm running into 2 problems. When I try to log in (http://nkarrasch.herokuapp.com/access) I get an error "We're sorry, but something went wrong". I should instead be getting a flash message with invalid username/password combination. This is what I'm getting on my test environment on my local machine. Secondly, when I log into the Heroku console to create and create an admin user, when I try to save that user I get the following error: irb(main):004:0> user.save (1.2ms) BEGIN AdminUser Exists (1.9ms) SELECT 1 AS one FROM "admin_users" WHERE "admin_users"."username" = 'Nick5a1' LIMIT 1 (1.7ms) ROLLBACK => false Any advice on how to troubleshoot would be greatly appreciated :). Thanks very much, Nick EDIT: Here are my Heroku logs: 2012-06-27T20:36:44+00:00 heroku[slugc]: Slug compilation started 2012-06-27T20:37:34+00:00 heroku[api]: Add shared-database:5mb add-on by [email protected] 2012-06-27T20:37:34+00:00 heroku[api]: Release v2 created by [email protected] 2012-06-27T20:37:34+00:00 heroku[api]: Add RAILS_ENV, LANG, PATH, RACK_ENV, GEM_PATH config by [email protected] 2012-06-27T20:37:34+00:00 heroku[api]: Release v3 created by [email protected] 2012-06-27T20:37:34+00:00 heroku[api]: Release v4 created by [email protected] 2012-06-27T20:37:34+00:00 heroku[api]: Deploy 1d82839 by [email protected] 2012-06-27T20:37:35+00:00 heroku[slugc]: Slug compilation finished 2012-06-27T20:37:36+00:00 heroku[web.1]: Starting process with command `bundle exec rails server -p 45450` 2012-06-27T20:37:40+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:5) 2012-06-27T20:37:40+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:5) 2012-06-27T20:37:40+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:5) 2012-06-27T20:37:44+00:00 app[web.1]: => Rails 3.2.6 application starting in production on http://0.0.0.0:45450 2012-06-27T20:37:44+00:00 app[web.1]: => Call with -d to detach 2012-06-27T20:37:44+00:00 app[web.1]: => Booting WEBrick 2012-06-27T20:37:44+00:00 app[web.1]: Connecting to database specified by DATABASE_URL 2012-06-27T20:37:44+00:00 app[web.1]: => Ctrl-C to shutdown server 2012-06-27T20:37:44+00:00 app[web.1]: [2012-06-27 20:37:44] INFO WEBrick 1.3.1 2012-06-27T20:37:44+00:00 app[web.1]: [2012-06-27 20:37:44] INFO ruby 1.9.2 (2011-07-09) [x86_64-linux] 2012-06-27T20:37:44+00:00 app[web.1]: [2012-06-27 20:37:44] INFO WEBrick::HTTPServer#start: pid=2 port=45450 2012-06-27T20:37:45+00:00 heroku[web.1]: State changed from starting to up 2012-06-27T20:39:44+00:00 heroku[run.1]: Awaiting client 2012-06-27T20:39:44+00:00 heroku[run.1]: Starting process with command `bundle exec rake db:migrate` 2012-06-27T20:39:44+00:00 heroku[run.1]: State changed from starting to up 2012-06-27T20:39:51+00:00 heroku[run.1]: Process exited with status 0 2012-06-27T20:39:51+00:00 heroku[run.1]: State changed from up to complete 2012-06-27T20:41:05+00:00 heroku[run.1]: Awaiting client 2012-06-27T20:41:05+00:00 heroku[run.1]: Starting process with command `bundle exec rails console` 2012-06-27T20:41:05+00:00 heroku[run.1]: State changed from starting to up 2012-06-27T20:46:09+00:00 heroku[run.1]: Process exited with status 0 2012-06-27T20:46:09+00:00 heroku[run.1]: State changed from up to complete

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• g++ How to get warning on ignoring function return value

  - by ArunSaha

  lint produces some warning like: foo.c XXX Warning 534: Ignoring return value of function bar() From the lint manual 534 Ignoring return value of function 'Symbol' (compare with Location) A function that returns a value is called just for side effects as, for example, in a statement by itself or the left-hand side of a comma operator. Try: (void) function(); to call a function and ignore its return value. See also the fvr, fvo and fdr flags in §5.5 "Flag Options". I want to get this warning, if there exists any, during compilation. Is there any option in gcc/g++ to achieve this? I had turned on -Wall but that apparently did not detect this.

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• Error including image in Latex

  - by euphoria83

  I am getting the following error while compiling my Latex File : ! LaTeX Error: Cannot determine size of graphic in tree.jpg (no BoundingBox). Why do I get this error ? What has this to do with an .eps file ? Infact, I could compile it fine with MacTex on my machine. But when I submit it online to a scientific journal for publication, it compiles it on the server and sends me the resultant PDF which as all these error that prevent it from compiling. I am using the following syntax for including the images : \begin{figure}[!h] \begin{center} \scalebox{0.45}{ \includegraphics{tree.jpg}} \end{center} \caption{\small A sample} \label{tree} \end{figure} What should I do ? Could it be that their server is using an old compiler ? UPDATE : It finally worked. I converted the first image to PDF and the compilation happened perfectly. I guess it used the bounding box value from that PDF and applied it to all images.

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• How to define using statements in web.config?

  - by Hasan Gürsoy

  I'm using MySql in my asp.net project. But I don't want to type every "using MySql.Data.MySqlClient;" statement in every aspx.cs file. How can I define this lines in web.config file? I've defined some namespaces like below but this only works for aspx pages: <?xml version="1.0"?> <configuration> <system.web> <compilation debug="false" targetFramework="4.0"/> <pages> <namespaces> <add namespace="System.Web.Configuration"/> <add namespace="MySql.Data"/> <add namespace="MySql.Data.MySqlClient"/> </namespaces> </pages> </system.web> </configuration>

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• Does the Frontier Kernel have a future?

  - by pbreitenbach

  Whatever you think about Dave Winer, Frontier is an incredible piece of software. It includes quite a few advances that have yet to be surpassed: the object database, the database viewer, the scripting environment, the hierarchical-including website generation scheme, the elegant scripting language, the mixing of scripts and compilation, rapid prototyping, built in web server, simple debugger, cross-platform, simple UI, etc. My question: Dave turned Frontier over to open source and there is a Frontier Kernel project. However it is fairly quiet. Does Frontier have a future from here?

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• Silly Objective-C inheritance problem when using property

  - by Ben Packard

  I've been scratching my head with this for a couple of hours - I haven't used inheritance much. Here I have set up a simple Test B class that inherits from Test A, where an ivar is declared. But I get the compilation error that the variable is undeclared. This only happens when I add the property and synthesize declarations - works fine without them. TestA Header: #import <Cocoa/Cocoa.h> @interface TestA : NSObject { NSString *testString; } @end TestA Implementation is empty: #import "TestA.h" @implementation TestA @end TestB Header: #import <Cocoa/Cocoa.h> #import "TestA.h" @interface TestB : TestA { } @property NSString *testProp; @end TestB Implementation (Error - 'testString' is undeclared) #import "TestB.h" @implementation TestB @synthesize testProp; - (void)testing{ NSLog(@"test ivar is %@", testString); } @end

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• gcc problem with explicit template instantiation?

  - by steve jaffe

  It is my understanding that either a declaration or typedef of a specialization ought to cause a template class to be instantiated, but this does not appear to be happening with gcc. E.g. I have a template class, template class Foo {}; I write class Foo<double>; or typedef Foo<double> DoubleFoo; but after compilation the symbol table of the resulting object file does not contain the members of Foo. If I create an instance: Foo<double> aFoo; then of course the symbols are all generated. Has anyone else experienced this and/or have an explanation?

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• (Visual) C++ project dependency analysis

  - by polyglot

  I have a few large projects I am working on in my new place of work, which have a complicated set of statically linked library dependencies between them. The libs number around 40-50 and it's really hard to determine what the structure was initially meant to be, there isn't clear documentation on the full dependency map. What tools would anyone recommend to extract such data? Presumably, in the simplest manner, if did the following: define the set of paths which correspond to library units set all .cpp/.h files within those to belong to those compilation units capture the 1st order #include dependency tree One would have enough information to compose a map - refactor - and recompose the map, until one has created some order. I note that http://www.ndepend.com have something nice but that's exclusively .NET unfortunately. I read something about Doxygen being able accomplish some static dependency analysis with configuration; has anyone ever pressed it into service to accomplish such a task?

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• How can match end-of-line multiple times in a regex without interpolation?

  - by harschware

  Hi, if I have a input with new lines in it like: [INFO] xyz [INFO] How can I pull out the xyz part? I tried a pattern like /^\[INFO\]$(.*?)$\[INFO\]/ms, but perl gives me: Use of uninitialized value $\ in regexp compilation at scripts\t.pl line 6. I've been trying things to get interpolation to stop like using qr// but alas, no love. EDIT: The key is that the end-of-line anchor is a dollar sign but at times it may be necessary to intersperse the end-of-line anchor through the pattern. If the pattern is interpolating then you might get problems such as uninitialized $\. For instance an acceptable solution here is /^\[INFO\]\s*^(.*?)\s*^\[INFO\]/ms but that does not solve the crux of the first problem. I've changed the anchors to be ^ so there is no interpolation going on, and with this input I'm free to do that. But what about when I really do want to reference EOL with $ in my pattern? How do I get the regex to compile?

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• maven-archetype-webapp eclipse problem

  - by Bruce

  Hi all, I'm trying to create a very simple webapp with maven and eclipse, but I'm having no joy at all, in fact the reverse of joy. I go to File - New Project, select Maven Project, and select the maven-archetype-webapp. When I finish the wizard, a webapp structure gets generated but with no 'java' directory under main, just resources and webapp. So I right click on main and select new Class. The class gets created under resources (?!), and furthermore, there seems to be no compilation of it by java. I can make stupid errors and no syntax highlighting comes up. It's like java isn't recognizing it. Alternatively I have tried creating a new 'java' directory under main where it should be, but still with the same non-existent java symptoms. What gives? This is driving me insane.. Thanks all!

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• ASP.Net: Finding the cause of OutOfMemoryExpcetions

  - by Keith Bloom

  I trying to track down the cause of an OutOfMemory for a website. This site has ~12,000 .aspx pages and the last time it crashed I captured a memory dump using adplus. After some investigation I found a lot of heap fragmentation, there are around 100MB of Free blocks which can't be assigned. Digging deeper one of the Large Object Heaps is fragmented and the causes seems to be String interning as described [here][1] Could this be caused by the number of pages in the site? As they are all compiled they sit in memory and by looking at the dump they are interned and PINNED which I think means they stick around for a while. I would find this odd as there are many sites with more pages, but dynamic compilation could account for the growth in memory. What other methods are there for finding the cause of the memory leak? I have tried to capture a dump using adplus in hang mode but this fails and the IIS worker process get recycled. [1]: • http://stackoverflow.com/questions/686950/large-object-heap-fragmentation

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• New to C/C++ Using Android NDK to port Legacy code, getting compile errors

  - by Donal Rafferty

  I have been trying to take some old Symbian C++ code over to Android today using the NDK. I have little to no C or C++ knowledge so its been a chore, however has to be done. My main issue is that I'm having trouble porting what I believe is Symbian specifi code to work using the small C/C++ subset that is available with the Android NDK. Here is a picture of the compilation errors I'm getting using cygwin I was wondering if anyone could point me in the right direction on how to deal with these errors? For instance is TBool/Int/TUint/RPointerArray/RSocket a Symbian primitive and thats why it wont compile or is it something else? Also what is ISO C++? Any tutorials, guides or tips and help would be greatly appreciated.

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• Question about best practices and Macros from the book 'C++ Coding Standards'

  - by Victor T.

  From Herb Sutter and Andrei Alexandrescu's 'C++ Coding Standards', Item 16: Avoid Macros under Exceptions for this guideline they wrote: For conditional compilation (e.g., system-dependent parts), avoid littering your code with #ifdefs. Instead, prefer to organize code such that the use of macros drives alternative implementations of one common interface, and then use the interface throughout. I'm having trouble understanding exactly what they mean by this. How can you drive alternate implementations without the use of #ifdef conditional compile macro directives? Can someone provide an example to help illustrate what's being proposed by the above paragraph? Thanks

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• Too slow gwt develpment mode !

  - by Ehsan Khodarahmi

  I'm using eclipse galileo with latest GWT 2.0 version in development mode, but it runs really slow (i should wait about 1 minute to open one page, but after compilation, my application works very well when I run it using tomcat 5.5). My code is not too heavy & i guess there is an os-related or software inconsistency problem, because I'd this problem before, but when i reinstalled my windows vista sp2 (I formatted my windows drive & reinstalled it), my problem solved for just some days & then again it became to slow ! I didn't install any special software on my windows, so i really dont know why this problem occures ??? any suggestion ?

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• VS compiling Error 1256 ( integer overflow in internal computation ... ) during inheritance

  - by odbb

  Hi there, my problem occurs during compiling Irrlicht3D Engine in VS 2008. 1Error 1256: integer overflow in internal computation due to size or complexity of "irr::IReferenceCounted" I'm currently merging a very old Softwaredriver I have written with the rest of the engine which is much newer. The main Problme is that I have tried to resolve abstract inherince problems. But now I get this error and it is the only one. "irr::IReferenceCounted" is one of the base classes used by other classes which have been inherinced from. What does that mean? I know that an integer overflow can be a normal overflow, but why is this shown during compilation? Any help appreciated! -db

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• Can I mix compile time string comparison with MPL templates?

  - by Negative Zero

  I got this compile time string comparison from another thread using constexpr and C++11 (http://stackoverflow.com/questions/5721813/compile-time-assert-for-string-equality). It works with constant strings like "OK" constexpr bool isequal(char const *one, char const *two) { return (*one && *two) ? (*one == *two && isequal(one + 1, two + 1)) : (!*one && !*two); } I am trying to use it in the following context: static_assert(isequal(boost::mpl::c_str<boost::mpl::string<'ak'>>::value, "ak"), "should not fail"); But it gives me an compilation error of static_assert expression is not an constant integral expression. Can I do this?

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• Abstract classes in shared library

  - by JTom

  Hi, I have an ordinary abstract class that has couple of pure virtual methods. The class itself is a part of the shared library. The compilation of the shared library itself is OK. But when the library is linked to another program that has another class deriving from the abstract one in the shared library and defining the pure virtual methods, I get the following linker error: I compile like this..: g++ -I../path/to/the/library main.cpp derived.cpp -L../path/to/the/library -lsomename -o shared ...and the linker error is: libsomename.so: undefined reference to `AbstractClass::method()' It's like the abstract class cannot access its pure virtual methods but I do not try to make any instance of the abstract class anywhere in the library. What could be the problem?

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• Is Lightweight Code Generation (LCG) dead?

  - by Greg Beech

  In the .NET 2.0-3.5 frameworks, LCG (aka the DynamicMethod class) was a decent way to emit lightweight methods at runtime when no class structure was needed to support them. In .NET 4.0, expression trees now support statements and blocks, and as such appear to provide sufficient functionality to build just about any functionality you could require from such a method, and can be constructed in a much easier and safer way than directly emitting CIL op-codes. (This statement is borne from today's experimentation of converting some of our most complex LCG code to use expression tree building and compilation instead.) So is there any reason why one would use LCG in any new code? Is there anything it can do that expression trees cannot? Or is it now a 'dead' piece of functionality?

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• Recompilation problem with groovlets (Groovy)

  - by BasB

  I'm new to Groovy, really like it, but found a compilation problem. I'm using Jetty as a webserver, which is serving .groovy files (groovlets) Consider two files: Test1.groovy which contains:    println new Test2().property Test2.groovy which contains:   public class Test2 {    String property = "print this"  } When calling /Test1.groovy in a browser it prints "print this". But when I change the property in something else, it still prints "print this", it won't recompile. The only thing I can do is restart jetty. Note that when all the code is in one file, recompilation does work. Is there a workaround for this..? Thanks, Bas.

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• ignore certain buffers using iswitchb

  - by robUK

  Hello, GNU Emacs 23.1 I am using iswitchb. However, when I press c-x b I get a list of buffers. However, I don't want to display one like scratch, Messages, GNU Emacs, etc. Just the buffers I have opened myself. So I am looking for a way to ignore these buffers. This is what I have in my configuration. However, it doesn't ignore the buffers I don't want. Have I done anything wrong? ;; Setup iswitchb to select different buffers, ignore buffers to reduce list (iswitchb-mode 1) (setq iswitchb-buffer-ignore '("*scratch*")) (setq iswitchb-buffer-ignore '("*Messages*")) (setq iswitchb-buffer-ignore '("*GNU Emacs*")) (setq iswitchb-buffer-ignore '("*compilation*")) Many thanks for any suggestions,

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• Load resources? - wxPython / Python

  - by Francisco Aleixo

  Hello everyone. I am using wxPython and Py2exe to create my application and my only problem is loading for example bitmaps. Ok so lets say I want to add an image to my application, and thats fairly easy using wxPython, and lets say it is on the same directory of my .py so for example: image = wx.StaticBitmap(self, -1, wx.Bitmap('image.bmp') Now, this works obviously fine, problem is when I convert to Py2exe, I would like to use the resources from the dlls that I included in the Py2Exe compilation. So basically what I want to do is to instead of including the images on the same folder as my application in order to work, I would like to use it from the resources so people won't see the images on the folder.

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• asp.net Configuration Error on host

  - by zey

  I uploaded my asp.net site to hosting site , and my site browse correctly . But when I go to login url , it's show me the error Configuration Error Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately. Parser Error Message: It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level. This error can be caused by a virtual directory not being configured as an application in IIS. Source Error: Line 23: </assemblies> Line 24: </compilation> Line 25: <authentication mode="Forms"> Line 26: <forms loginUrl="~/Account/Login.aspx" timeout="2880" /> Line 27: </authentication> How can I fix it ?

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• Change Makefile variable value

  - by paulgray

  Is there a way to reassign Makefile variable value inside of the target body? What I am trying to do is to add some extra flags for debug compilation: %.erl: %.beam $(ERLC) $(ERLFLAGS) -o ebin $< test: clean debug_compile_flag compile compile_test debug_compile: $(ERLCFLAGS) += -DTEST So if I invoke test target I would like to clean up my environment, add some new flags (like -DTEST to the existing ones), compile the whole code once again (first sources, then test modules). I do not want to copy/paste the code for compiling with some new flags set since there is a lot of logic put here and there. Is there some easy way to redefine the variable value so I can reuse the existing code?

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