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Articles indexed Sunday May 2 2010

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  • Is there any small linux distribution which comes with a complete C devleopment environment

    - by hits_lucky
    Hi, I have installed "Damn Small Linux" on my home computer for doing C development in unix. But the distribution doesn't by default come with the C development environment and I am facing some issues when trying to install the gcc. Is there any other small Linux distribution which by default has the required packages for the C development. And also I don't want additional software which takes up lot of space but still would like to have the graphical environment. Thanks

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  • Use of Hibernate 3.0 with EJB 3.0 & JPA

    - by SOA Nerd
    Where I'm working the guys that are sitting across from me are working on a project. This is a JavaEE app which uses Struts, Spring, EJB 3.0, JPA, and Hibernate 3.0. They are using EJB 3.0 entity beans with annotations. I've been asking them why Hibernate 3.0 is in this mix and noone can seem to tell me. It feels like they've included Hibernate 3.0 because they were told to but are not using it for anything that they can't get from EJB 3.0 entity beans/JPA. They're using CMP and accessing all of the database functions via EJBs. Can Hibernate give you anything in this setup that can't be provided by EJB 3.0/JPA?

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  • Question about spring transaction propagation

    - by Yousui
    Hi guys, I have a question about spring transaction propagation. If I use @Transactional(propagation = Propagation.REQUIRED) to annotate a method m1. When execution logic enter m1, if there is already a transaction, m1 will use that one. When after m1, what about the transaction? It ends or still open?(if I call m1 in another method, and after the invocation there is still other things to do). In summary, I want to know when exiting an annotated method, the transaction ends or still open? Great thanks.

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  • += Overloading in C++ problem.

    - by user69514
    I am trying to overload the += operator for my rational number class, but I don't believe that it's working because I always end up with the same result: RationalNumber RationalNumber::operator+=(const RationalNumber &rhs){ int den = denominator * rhs.denominator; int a = numerator * rhs.denominator; int b = rhs.numerator * denominator; int num = a+b; RationalNumber ratNum(num, den); return ratNum; } Inside main //create two rational numbers RationalNumber a(1, 3); a.print(); RationalNumber b(6, 7); b.print(); //test += operator a+=(b); a.print(); After calling a+=(b), a is still 1/3, it should be 25/21. Any ideas what I am doing wrong?

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  • Under *nix, how can I find a string within a file within a directory ?

    - by roberto
    Hi all. I'm using ubuntu linux, and I use bash from with a terminal emulator every day for many tasks. I would like to know how to find a string or a substring within a file that is within a particular directory. If I was knew the file which contained my target substring, I would just cat the file and pipe it through grep, thus: cat file | grep mysubstring But in this case, the pesky substring could be anywhere within a known directory. How do I hunt down my substring ?

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  • Having an issue with org.hibernate.SessionException: Session is closed! in Hibernate

    - by hal10001
    I've done quite a bit a research on this with no luck, but all the answers have a tendency to point toward the session context settings in the config file. What is odd is that I get a session connection the very first time I hit the page (and therefore, a successful result set), but then when I reload I get the following exception: org.hibernate.SessionException: Session is closed! Here are my config settings that are not DB connection string related: <property name="hibernate.show_sql">false</property> <property name="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</property> <property name="hibernate.current_session_context_class">thread</property> <property name="hibernate.cache.provider_class">org.hibernate.cache.NoCacheProvider</property> <property name="hibernate.cache.use_query_cache">false</property> <property name="hibernate.cache.use_minimal_puts">false</property> Here is an example of a call I make that produces the situation I described above. public T get(int id) { session.beginTransaction(); T type; try { type = getTypeClass().cast(session.get(getTypeClass(), id)); } catch (ClassCastException classCastException) { throw new ClassCastException(classCastException.getMessage()); } session.getTransaction().commit(); return type; } The session variable reference is to a static field that contains the current session. All of the session connection details are textbook reference manual. For example, here is my Hibernate session utility: import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; public class HibernateSessionFactoryUtil { private static final SessionFactory sessionFactory = buildSessionFactory(); private static SessionFactory buildSessionFactory() { try { return new Configuration().configure().buildSessionFactory(); } catch (Throwable ex) { System.err.println("Initial SessionFactory creation failed." + ex); throw new ExceptionInInitializerError(ex); } } public static SessionFactory getSessionFactory() { return sessionFactory; } }

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  • using Hibernate to loading 20K products, modifying the entity and updating to db

    - by Blankman
    I am using hibernate to update 20K products in my database. As of now I am pulling in the 20K products, looping through them and modifying some properties and then updating the database. so: load products foreach products session begintransaction productDao.MakePersistant(p); session commit(); As of now things are pretty slow compared to your standard jdbc, what can I do to speed things up? I am sure I am doing something wrong here.

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  • Language-agnostic term for typed things that need memory

    - by FredOverflow
    Is there an accepted general term that subsumes the concepts of variables, class instances and arrays? Basically "any typed thing that needs memory". In C++, such a thing is called an object, but I'm looking for a more language-agnostic term. § 1.8 The C++ object model 1 The constructs in a C++ program create, destroy, refer to, access, and manipulate objects. An object is a region of storage. [...] An object can have a name (Clause 3). An object has a storage duration (3.7) which influences its lifetime (3.8). An object has a type (3.9).

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  • JPA and hibernate for Flex

    - by dejaninic
    I'm using JPA but I'm not sure how to use it for relation between two classes. I need to connect them @OneToMany. I have done this before but forgot. Is there any good tutorial for this or an example that is easy to understand. By the way this is a Flex application where I'm using BlazeDS for connection between Java and Flex.

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  • how can I get jquery.sIFR plugin to display sIFR-alternate text for print?

    - by apeBoy
    I'm struggling with this. I've used the jquery sIFR plugin as opposed to sIFR it prevented conflicts with other jquery I am using on my pages. It works fine in its prime function: replacing html text with Flash. However, the .sIFR-alternate class is given an inline style of 'opacity: 0' which persists when flashblock is on. So alternate text does not appear. Neither does it appear when printng the page (yes I have included styles for sIFR-print). I've tried replacing the opacity:0 inline style with display: none but this causes height issues with the output flash. Any one else had this or have any ideas?

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  • How to share javascript libraries in between components of my website (i.e. lightbox)

    - by Patrick
    Can I share javascript libraries I've loaded in part of my website, with other components ? For example, I'm loading a node of my drupal website into a lightbox (rel="lightmodal"), so it is not a frame. I would like to have access from the content of the lightbox to qtip.js library (at the moment I'm using its functions but it doesn't find the library, so it doesn't work..) thanks

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  • Hibernate bug using Oracle?

    - by Lothar
    Hello, I've got the problem, that I use a property in the persistence.xml which forces Hibernate to look only for tables in the given schema. <property name="hibernate.default_schema" value="FOO"/> Because we are using now 4 different schemas the actual solution is to generate 4 war files with a modified persistence.xml. That not very elegant. Does anybody know, how I can configure the schema with a property or by manipulation the JDBC connection string? I'm using Oracle 10g, 10_2_3 Patch. Thanks a lot.

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  • Hibernate Annotation for Entity existing in more than 1 catalog

    - by user286395
    I have a Person entity mapped by Hibernate to a database table in a database catalog "Active". After a period of time, records in this database table in the "Active" catalog are archived/moved to an exact copy of the table in a database Catalog "History". I have the need to retrieve from both the Active and History Catalogs. Is there a better way to model this with Hibernate annotations than making an abstract class that 2 classes extend from. This is what I have now. @MappedSuperclass public abstract class Person { @Id private Integer id; private String name; } @Entity @Table(name="Person", catalog="Active") public class PersonActive extends Person { } @Entity @Table(name="Person", catalog="History") public class PersonHistory extends Person { }

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  • hibernate.properties classpath conflict

    - by Adam B
    I have a jar on the classpath which contains a hibernate.properties. This causes problems when my app starts because hibernate tries to use the settings from this file. Is there a way to explicitly specify the file that hibernate should look for, or tell it to ignore the properties file in the dependency jar?

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  • Rails created_at find condition...

    - by Dustin Brewer
    I'm attempting to sum daily purchase amounts for a given user. @dates is an array of 31 dates. I need the find condition to compare a date from the array to the created_at date of the purchases. What I'm doing below compares the exact DateTime for the create_at column. I need it to look at the day itself, not the DateTime. How can I write this so created_at is in between the date from the array? <% @dates.each do |date| %> <%= current_user.purchases.sum(:amount, :conditions = ["created_at = ?", date]) % <% end %

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  • App will not launch from drawer after phone is removed from car dock

    - by BigFwoosh
    I am creating a replacement Car Home app for Android 2.0+ devices. The app needs to launch when the phone is inserted into the car dock, as well as terminate when it is removed from the dock. It also needs to be able to be launched from the app drawer. I'm having a problem right now where once the phone is inserted and removed from the dock, I can no longer launch the app from the app drawer because every time I launch the app my BroadcastReceiver picks up a DOCK_EVENT action for some reason. I created a test project that only registers my BroadcastReceiver, and the same thing happens. Here's the code for the BroadcastReceiver: public class CarDockBroadcastReceiver extends BroadcastReceiver { /** * @see android.content.BroadcastReceiver#onReceive(Context,Intent) */ @Override public void onReceive(Context context, Intent intent) { // TODO Put your code here if(intent.getExtras().containsKey("android.intent.extra.DOCK_STATE")){ int state = intent.getExtras().getInt("android.intent.extra.DOCK_STATE",1); if(state == 0){ Log.i("Dock", "Removed from dock!"); ((Activity)context).finish(); } } } } My main Activity is as follows: public class MainActivity extends Activity { /** Called when the activity is first created. */ CarDockBroadcastReceiver receiver; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); IntentFilter filter = new IntentFilter("android.intent.action.DOCK_EVENT"); receiver = new CarDockBroadcastReceiver(); registerReceiver(receiver, filter); } @Override protected void onDestroy() { // TODO Auto-generated method stub unregisterReceiver(receiver); super.onDestroy(); } } The main Activity has an intent filter for action.MAIN, category.LAUNCHER, category.DEFAULT, and category.CAR_DOCK. Any ideas on why this is happening?

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  • List comprehension in Ruby

    - by Readonly
    To do the equivalent of Python list comprehensions, I'm doing the following: some_array.select{|x| x % 2 == 0 }.collect{|x| x * 3} Is there a better way to do this...perhaps with one method call?

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  • Error when trying to use hibernate annotations.

    - by Wilhelm
    The error I'm receiving is listed here. That's my HibernateUtil.java package com.rosejapan; import org.hibernate.SessionFactory; import org.hibernate.cfg.AnnotationConfiguration;; public class HibernateUtil { private static final SessionFactory sessionFactory; static { try { // Create the SessionFactory from hibernate.cfg.xml sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory(); } catch(Throwable e) { System.err.println("Initial sessionFactory creation failed. " + e); throw new ExceptionInInitializerError(e); } } public static SessionFactory getSessionFactory() { return sessionFactory; } } Everything looks all right... I've already included log4j-boot.jar in the CLASSPATH, but didn't resolved my problem.

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  • Can't connect to FTP sites

    - by Javier Badia
    This started happening when I installed Windows 7. I've tried with Filezilla and with the FireFTP Firefox plugin, and I could never connect. Filezilla gave the error message "ECONNREFUSED - Connection refused by server". I tried disabling the Windows Firewall, but no luck. Any ideas on what might be causing this? I just discovered that I can connect with web services like net2ftp, but not with FTP clients.

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  • How does object of sub-class record information about its super-class the in a Virtual Inheritance

    - by Summer_More_More_Tea
    Hi there: I encounter this problem when tackling with virtual inheritance. I remember that in a non-virtual inheritance hierarchy, object of sub-class hold an object of its direct super-class. What about virtual inheritance? In this situation, does object of sub-class hold an object of its super-class directly or just hold a pointer pointing to an object of its super-class? By the way, why the output of the following code is: sizeof(A): 8 sizeof(B): 20 sizeof(C): 32 Code: #include <iostream> using namespace std; class A{ char k[ 3 ]; public: virtual void a(){}; }; class B : public virtual A{ char j[ 3 ]; public: virtual void b(){}; }; class C : public virtual B{ char i[ 3 ]; public: virtual void c(){}; }; int main( int argc, char *argv[] ){ cout << "sizeof(A): " << sizeof( A ) << endl; cout << "sizeof(B): " << sizeof( B ) << endl; cout << "sizeof(C): " << sizeof( C ) << endl; return 0; } Thanks in advance. Kind regards.

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