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  • Does rails do a rollback if I use begin...rescue?

    - by codeman73
    I'd like to add a begin...rescue block to one of my controllers create method, in order to log better info and construct the correct error message to return to the client. Does the rescue in any way 'interrupt' the rollback process? I'm assuming rails automatically does a rollback. When does it happen? Has it already happened by the time I get in the rescue clause? I'm using mySQL on Dreamhost and I think they use innoDB.

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  • Updating .class file in a jar throws exception

    - by CheesePls
    I'm trying to port a wikimedia plugin to run on OpenVMS and needed to alter a class. I'm trying to update the .class file in the jar using jar uf jar-file .class-file, however when I do this I get the following: java.util.zip.ZipException: duplicate entry: META-INF/LICENSE.txt at java.util.zip.ZipOutputStream.putNextEntry(ZipOutputStream.java:175) at java.util.jar.JarOutputStream.putNextEntry(JarOutputStream.java:90) at sun.tools.jar.Main.update(Main.java:507) at sun.tools.jar.Main.run(Main.java:184) It turns out there are 2 LICENSE.txt files in the jar and I can't seem to get rid of them. Any ideas on how to just get the new .class file into the jar or how to get rid of the duplicate file?

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  • KeyNotFound Exception in CSsharp

    - by C Patton
    I'm about ready to bang my head against the wall I have a class called Map which has a dictionary called tiles. class Map { public Dictionary<Location, Tile> tiles = new Dictionary<Location, Tile>(); public Size mapSize; public Map(Size size) { this.mapSize = size; } //etc... I fill this dictionary temporarily to test some things.. public void FillTemp(Dictionary<int, Item> itemInfo) { Random r = new Random(); for(int i =0; i < mapSize.Width; i++) { for(int j=0; j<mapSize.Height; j++) { Location temp = new Location(i, j, 0); int rint = r.Next(0, (itemInfo.Count - 1)); Tile t = new Tile(new Item(rint, rint)); tiles[temp] = t; } } } and in my main program code Map m = new Map(10, 10); m.FillTemp(iInfo); Tile t = m.GetTile(new Location(2, 2, 0)); //The problem line now, if I add a breakpoint in my code, I can clearly see that my instance (m) of the map class is filled with pairs via the function above, but when I try to access a value with the GetTile function: public Tile GetTile(Location location) { if(this.tiles.ContainsKey(location)) { return this.tiles[location]; } else { return null; } } it ALWAYS returns null. Again, if I view inside the Map object and find the Location key where x=2,y=2,z=0 , I clearly see the value being a Tile that FillTemp generated.. Why is it doing this? I've had no problems with a Dictionary such as this so far. I have no idea why it's returning null. and again, when debugging, I can CLEARLY see that the Map instance contains the Location key it says it does not... very frustrating. Any clues? Need any more info? Help would be greatly appreciated :)

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  • An exception to the "only one implementation" rule ?

    - by ereOn
    While I was reading the accepted answer of this question, I had the following question: Typically, methods are defined in header files (.hpp or whatever), and implementation in source files (.cpp or whatever). One of the main reasons it is bad practice to ever include a "source file" (#include <source_file.cpp>) is that its methods implementation would then be duplicated, resulting in linking errors. When one writes: #ifndef BRITNEYSPEARS_HPP #define BRITNEYSPEARS_HPP class BritneySpears { public: BritneySpears() {}; // Here the constructor has implementation. }; #endif /* BRITNEYSPEARS_HPP */ He is giving the implementation of the constructor (here an "empty" implementation, but still). But why then including this header file multiple times (aka. on different source files) will not generate a "duplicate definition" error at link time ?

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  • jQuery, selecting form elements by name, getting: Error: uncaught exception: Syntax error, unrecogni

    - by Mark Steudel
    I'm trying to select an select element by name I found this thread showing how to do it, and I followed it but I'm getting Syntax error. I'm using jquery 1.4.1, here's my code. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <title>TODO supply a title</title> <script type="text/javascript" src="/js/jquery-1.4.1.min.js"></script> <script type="text/javascript"> $(document).ready(function(){ alert( $('select[@name="country[0]"]').val() ); }) </script> </head> <body> <form> <select name="country[0]"> <option value="23">test</option> </select> </form> </body> </html> Thanks in advance for any insight. MS

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  • document.evalute function giving exception

    - by R_Dhorawat
    i have a code like res = doc.evalute(xpathExpr,doc,function(prefix) { return namespaces[prefix] || null;}, XPathResult.ANY_TYPE,null ); here doc is DOM document node when i run for loop like this for(i in doc)alert(i); it gives evalute method but when i tried to use this method on dom node it giving me error like xpathResult not defined... i'm working in android browser thanks in advance....

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  • Why I get UnsupportedOperationException when trying to remove from the List?

    - by Pentium10
    I have this code: public static String SelectRandomFromTemplate(String template,int count) { String[] split = template.split("|"); List<String> list=Arrays.asList(split); Random r = new Random(); while (list.size()>count) { list.remove(r.nextInt(list.size())); } return StringUtils.join(list, ", "); } I get this: 06-03 15:05:29.614: ERROR/AndroidRuntime(7737): java.lang.UnsupportedOperationException 06-03 15:05:29.614: ERROR/AndroidRuntime(7737): at java.util.AbstractList.remove(AbstractList.java:645) How would be this the correct way? Java.15

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  • how to delete in Mysql

    - by Ian Moss
    i want to delete a element in mysql. the problem is that my connection not succesfully open and they give me error unable to connect even same connectionstring work elsewhere in current project. well when my code open the connection they work fine. but a small function try to delete a row in Mysql. i am confused what is goes wrong because :- same connectionstring work elsewhere in project i trying but a function only have a project [unable to connect] the [unable to connect] problem come when my code trying to delete the rows in mysql. i use sqlyog to open the connection and they work fine as other code work and their is no problem i got when i run the command on sqlyog. conclusion:- why connection not open if they work elsewhere in the project and in also in sqlyog. any reason for unable to connect. because connection can not open offcourse command never run so what is reason upon the connection unable to connect. well any suggestion , thing you feel and trick you have to solve this issue i have. thanks

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  • CAn unused exception variable when catching all exceptions

    - by b0x0rz
    what is a best practice in cases such as this one: try { // do something } catch (SpecificException ex) { Response.Redirect("~/InformUserAboutAn/InternalException/"); } the warning i get is that ex is never used. however all i need here is to inform the user, so i don't have a need for it. do i just do: try { // do something } catch { Response.Redirect("~/InformUserAboutAn/InternalException/"); } somehow i don't like that, seems strange!!? any tips? best practices? what would be the way to handle this. thnx

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  • Left outer join in LINQ is showing exception

    - by stackuser3
    The folloqing is the excpetion I am getting The null value cannot be assigned to a member with type System.Int32 which is a non-nullable value type. below is my LINQ Statement where QuestionId is the primary key in my table var questionViewsData = from questionViews in objDc.SC_QuestionsViews join questions in objDc.SC_Questions on questionViews.QuestionId equals questions.QuestionId into qs from questions in qs.DefaultIfEmpty() where questionViews.CreatedDate.Date == new DateTime(2010, 4,27) select new { Selected =(questions == null ?-1:questions.QuestionId), QuestioinTitle = questions.Title, VotesCount = questions.VotesCount }; Let me know how to resolve this

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  • Redirect on catching an exception in a method in the model

    - by Arkid
    I am using Authlogic-connect to connect various service providers. There is a method in user.rb def complete_oauth_transaction token = token_class.new(oauth_token_and_secret) old_token = token_class.find_by_key_or_token(token.key, token.token) token = old_token if old_token if has_token?(oauth_provider) self.errors.add(:tokens, "you have already created an account using your #{token_class.service_name} account, so it") else self.access_tokens << token end end When a service provider is already added it gives the error as stated in the has_token? method and the page breaks. I need to redirect the app to the same page and flash the error. How do i do this? I have overridden the method in my own user.rb so that I can change the code.

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  • No Hibernate Session bound to thread exception

    - by Benchik
    I have Hibernate 3.6.0.Final and Spring 3.0.0.RELEASE I get "No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here" If I add the thread specification back in, I get "saveOrUpdate is not valid without active transaction" Any ideas? The spring-config.xml: <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="org.hsqldb.jdbcDriver"/> <property name="url" value="jdbc:hsqldb:mem:jsf2demo"/> <property name="username" value="sa"/> <property name="password" value=""/> </bean> <bean id="sampleSessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"> <property name="dataSource" ref="sampleDataSource"/> <property name="annotatedClasses"> <list> <value>com.maxheapsize.jsf2demo.Book</value> </list> </property> <property name="hibernateProperties"> <props> <!-- prop key="hibernate.connection.pool_size">0</prop--> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.dialect">org.hibernate.dialect.HSQLDialect</prop> <!-- prop key="transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</prop> <prop key="hibernate.current_session_context_class">thread</prop--> <prop key="hibernate.hbm2ddl.auto">create</prop> </props> </property> </bean> <bean id="sampleDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName"> <value>org.hsqldb.jdbcDriver</value> </property> <property name="url"> <value> jdbc:hsqldb:file:/spring/db/springdb;SHUTDOWN=true </value> </property> <property name="username" value="sa"/> <property name="password" value=""/> </bean> <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory" ref="sampleSessionFactory"/> </bean> <bean id="daoTxTemplate" abstract="true" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"> <property name="transactionManager" ref="transactionManager"/> <property name="transactionAttributes"> <props> <prop key="create*"> PROPAGATION_REQUIRED,ISOLATION_READ_COMMITTED </prop> <prop key="get*"> PROPAGATION_REQUIRED,ISOLATION_READ_COMMITTED </prop> </props> </property> </bean> <bean name="openSessionInViewInterceptor" class="org.springframework.orm.hibernate3.support.OpenSessionInViewInterceptor"> <property name="sessionFactory" ref="sampleSessionFactory"/> <property name="singleSession" value="true"/> </bean> <bean id="nameDao" parent="daoTxTemplate"> <property name="target"> <bean class="com.maxheapsize.dao.NameDao"> <property name="sessionFactory" ref="sampleSessionFactory"/> </bean> </property> </bean> and the DAO: public class NameDao { private SessionFactory sessionFactory; public void setSessionFactory(SessionFactory sessionFactory) { this.sessionFactory = sessionFactory; } public SessionFactory getSessionFactory() { return sessionFactory; } @Transactional @SuppressWarnings("unchecked") public List<Name> getAll() { Session session = this.sessionFactory.getCurrentSession(); List<Name> names = (List<Name>)session.createQuery("from Name").list(); return names; } //@Transactional(propagation= Propagation.REQUIRED, readOnly=false) @Transactional public void save(Name name){ Session session = this.sessionFactory.getCurrentSession(); session.saveOrUpdate(name); session.flush(); } }

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  • FileNotFound exception

    - by Pratik
    I am trying to read a file in a servlet. I am using eclipse IDE. I get a FileNotFoundException if I provide relative file name. List<String> ls=new ArrayList<String>(); Scanner input = new Scanner(new File("Input.txt")); while(input.hasNextLine()) { ls.add(input.nextLine()); } The same code works if I put the absolute path like this: Scanner input = new Scanner(new File("F:/Spring and other stuff/AjaxDemo/src/com/pdd/ajax/Input.txt")); The Java file and text file are there in the same folder. Does it searches text file in some other folder ?

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  • A Null Reference Exception

    - by Alex
    "Object reference not set to an instance of an object." using System; using System.Collections.Generic; using System.Linq; using System.Text; using Microsoft.Xna.Framework; using Microsoft.Xna.Framework.Content; using Microsoft.Xna.Framework.Graphics; namespace XNAdev { class Sprite { //The size of the Sprite public Rectangle Size; //Used to size the Sprite up or down from the original image public float Scale = 1.0f; //The current position of the Sprite public Vector2 Position = new Vector2(115, 0); //The texture object used when drawing the sprite private Texture2D mSpriteTexture; //Load the texture for the sprite using the Content Pipeline public void LoadContent(ContentManager theContentManager, string theAssetName) { mSpriteTexture = theContentManager.Load<Texture2D>(theAssetName); Size = new Rectangle(0, 0, (int)(mSpriteTexture.Width * Scale), (int)(mSpriteTexture.Height * Scale)); } //Draw the sprite to the screen public void Draw(SpriteBatch theSpriteBatch) { theSpriteBatch.Draw(mSpriteTexture, Position, new Rectangle(0, 0, mSpriteTexture.Width, mSpriteTexture.Height), Color.White, 0.0f, Vector2.Zero, Scale, SpriteEffects.None, 0); } } } I am very new at this C# so any help would be great. I have no idea what my error is.

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  • C# DateTime.ParseExact throwing format exception

    - by Rob
    I'm developing an .NET4 webapplication using MVC3. Let's say i'm getting the following DateTime as string from an XML-feed. The xml feed is being read by my application and i'm looping through all it's descendants. The DateTime i'm receiving is begin returned in the following format (as string); var myDateTime = "Sun Dec 19 11:45:45 +0000 2010" I'm using the piece of code below to try and parse the DateTime string i mentioned above to a valid DateTime format (preferably dutch) var CorrectDateTime = DateTime.ParseExact(myDateTime , "dd MMM yyyy HH:mm:ss", CultureInfo.InvariantCulture); When trying to execute this code i'm facing an formatexception. Somebody has got any ideas?

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  • Get name mangling when I try to use exceptions [CodeBlocks, C++]

    - by Beetroot
    I am trying to use exceptions for the first time but even though it is quite a simple example I just cannot get it to compile, I have looked at several examples and tried coding it in many, many different ways but I am still not even sure exactly where the problem is because I get namemangling when I introduce the catch/try/throw anyway here is my code hopefully it is something really stupid :) #include "Surface.h" #include "SDL_Image.h" using namespace std; SDL_Surface* surface::Load(string fileName){ SDL_Surface* loadedSurface = IMG_Load(fileName.c_str()); if(loadedSurface == 0) throw 0; //Convert surface to same format as display loadedSurface = SDL_DisplayFormatAlpha(loadedSurface); return loadedSurface; } #include "GameState.h" #include "Surface.h" #include<iostream> using namespace std; GameState::GameState(string fileName){ try{ stateWallpaper_ = surface::Load(fileName); } catch(int& e){ cerr << "Could not load " << fileName << endl; } } Thanks in advance for any help! EDIT: Sorry I forgot to post the error message: It is In function `ZN14GameStateIntroC1Ev':| -undefined reference to `__gxx_personality_sj0'| -undefined reference to `_Unwind_SjLj_Register'| -undefined reference to `_Unwind_SjLj_Unregister'| In function `ZN14GameStateIntroC1Ev':| undefined reference to `_Unwind_SjLj_Resume'| In function `ZN14GameStateIntroC2Ev':| -undefined reference to `__gxx_personality_sj0'| -undefined reference to `_Unwind_SjLj_Register'| -undefined reference to `_Unwind_SjLj_Unregister'| obj\Release\GameStateIntro.o||In function `ZN14GameStateIntroC2Ev':| C:\Program Files (x86)\CodeBlocks\MinGW\bin\..\lib\gcc\mingw32\3.4.5\..\..\..\..\include\c++\3.4.5\ext\new_allocator.h|69|undefined reference to `_Unwind_SjLj_Resume'| C:\MinGW\lib\libSDLmain.a(SDL_win32_main.o)||In function `redirect_output':| \Users\slouken\release\SDL\SDL-1.2.15\.\src\main\win32\SDL_win32_main.c|219|undefined reference to `SDL_strlcpy'| \Users\slouken\release\SDL\SDL-1.2.15\.\src\main\win32\SDL_win32_main.c|220|undefined reference to `SDL_strlcat'| \Users\slouken\release\SDL\SDL-1.2.15\.\src\main\win32\SDL_win32_main.c|243|undefined reference to `SDL_strlcpy'| \Users\slouken\release\SDL\SDL-1.2.15\.\src\main\win32\SDL_win32_main.c|244|undefined reference to `SDL_strlcat'| C:\MinGW\lib\libSDLmain.a(SDL_win32_main.o)||In function `console_main':| \Users\slouken\release\SDL\SDL-1.2.15\.\src\main\win32\SDL_win32_main.c|296|undefined reference to `SDL_strlcpy'| \Users\slouken\release\SDL\SDL-1.2.15\.\src\main\win32\SDL_win32_main.c|301|undefined reference to `SDL_GetError'| \Users\slouken\release\SDL\SDL-1.2.15\.\src\main\win32\SDL_win32_main.c|312|undefined reference to `SDL_SetModuleHandle'| C:\MinGW\lib\libSDLmain.a(SDL_win32_main.o)||In function `WinMain@16':| \Users\slouken\release\SDL\SDL-1.2.15\.\src\main\win32\SDL_win32_main.c|354|undefined reference to `SDL_getenv'| \Users\slouken\release\SDL\SDL-1.2.15\.\src\main\win32\SDL_win32_main.c|386|undefined reference to `SDL_strlcpy'| C:\MinGW\lib\libSDLmain.a(SDL_win32_main.o)||In function `cleanup':| \Users\slouken\release\SDL\SDL-1.2.15\.\src\main\win32\SDL_win32_main.c|158|undefined reference to `SDL_Quit'| **

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