Implement Singleton - Loading Resource Bundle Only Once For JVM
Jun 20, 2014
When I browsed I came to know two ways of implementing singleton.. I dont know which is best.. I am implementing this to load resource bundle only once for my jvm using constructor to getBundle.
public class bundle {
private final static Logger LOGGER = Logger.getLogger(bundle .class.getName());
private static bundle instance;
private static ResourceBundle messages;
private bundle () {
messages = ResourceBundle.getBundle("pb", Locale.getDefault());
[Code] ....
and I am calling this as bundle.getInstance.getMessage("hi");I wanted to knw which option is better and why.. and in the second case how can i call the getMessage() method?
Just want to ask, for example I have message_en_US.properties and message_en_SG.properties.And the web is currently using the SG property but one property is not exist on it, can I just redirect to use the US property?
My application suppose to work with different languages. I have created different messageResource bundle file for each language. However, as we are adding more features, the resource files for each language becoming very long, which makes it difficult to manage (edit) for non-techy person. Therefore, I would like to know, how can I redesign or remodularize in such a way that it will be easy to manage for Content Writers? Can I redesign my bundle resources based on application pages?
In my application i'm using java.util.ResourceBundle class. This is not serialized. My application works perfectly in a single node. But if i moved it to clustered mode resource bundle object will not be replicated to other server becasue it's not serializable.
I am not sure if this is the right for this question. I am working on a script that installs JDK on developers workstations using yum on CentOS 6.4 Linux, 64 bit. Before that I would like the script to perform a gpgcheck. I could not find the gpgkey on the Oracle Site. Where I can find it?
1. Create a class that will bundle together several static methods for tax computations. This class should not have a constructor. Its attributes are
• basicRate—the basic tax rate as a static double variable that starts at 4 percent - a private static method
• luxuryRate—the luxury tax rate as a static double variable that starts at 10 percent - a private static method
Its methods are
• computeCostBasic(price) —a static method that returns the given price plus the basic tax, rounded to the nearest penny.
• computeCostLuxury(price) —a static method that returns the given price plus the luxury tax, rounded to the nearest penny.
• changeBasicRateTo(newRate) —a static method that changes the basic tax rate.
• changeLuxuryRateTo(newRate) —a static method that changes the luxury tax rate.
• roundToNearestPenny(price)—a private static method that returns the given price rounded to the nearest penny. For example, if the price is 12.567, the method will return 12.57.
My code:
public class TejvirThindCh6Ex1 { /** * @param args the command line arguments */ //Atributes private static double basicRate = 4.0; private static double luxuryRate = 10.0; public static double computercostbasic(double price)
If i am correct, a singleton class is the one for which only one object is allowed to create right. so why can't i just use everything in that as static and access them using the class name ? what is the need to create a single object ?
I want to bundle some images and sounds with my project, that is, I want to put these images (png) into the jar and be able to access them inside my project.
/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk Using default package resource [Bundle config file] (add package/macosx/Info.plist to the class path to customize) Using default package resource [icon] (add package/macosx/app.icns to the class path to customize) Creating app bundle: /Users/Utente/Documents/workspaceServer/javafx/target/deploy/bundles/app.app Config files are saved to /var/folders/q6/vmt_h0tx3rgdbt_4h2_2f3780000gn/T/build6635061168386632777.fxbundler/macosx.
Use them to customize package. fxbund ler/macosx. Use them to customize package.
So I get files inside the temp directory and I copied them inside my project target directory. Unfortunally javafxbuilder don't use them to customize the package so I think the path where I have to put that files is wrong.
I want to create a singleton for DirContext for LDAP configuration, hence i have used the initialize on demandclass holder idiom as shown below
public class SlmApplicationContext { /** * inner class to hold the instance. */ private static class Holder { private static DirContext instance = new InitialDirContext(); }
/** * Method to get the singleton instance of this class. * @return SlmApplicationContext */ public static SlmApplicationContext getInstance() { return Holder.instance; } ... }
Now the problem is if i close the DirContext.close(), when the next request comes the singleton wont work as the dir context is already closed, hence it will create a new dir context for each requests. Which breaks the singleton concept, hence how we can ensure the singleton works fine even with DirContext.close()?
I made UpdateInmateDisplayer a Singleton so that I could access it from the private class ButtonHandler. It works to display the first inmate's number on the screen but when I close out the window and click the Book Inmate button in CurInmatesDisplayer again, it only shows a blank window. I've tried adding the components again from the ButtonHandler in CurInmatesDisplayer but it doesn't work.
My assignment was to create a simple form that demonstrates the use of the factory and singleton design patterns. "Use the Factory pattern to ensure that each form input consists of a text label and a textfield. Use the Singleton pattern for the submit button. When the submit button is clicked, a pop-up should show all the information that was typed into all of the form fields."
I used JFrame to create the form without the design patterns and I although I get the desired result, I'm not quite sure how I can integrate the design patterns into the code I wrote. The example I have to go off uses shapes, not text fields so I think that's why I'm not quite clear on how to approach this.
My assignment was to create a simple form that demonstrates the use of the factory and singleton design patterns. "Use the Factory pattern to ensure that each form input consists of a text label and a textfield. Use the Singleton pattern for the submit button."
Here's what I have:
Form.java file
interface Form { public void getFormField (); } Name.java file (I have a similar files just like this for Address.java, City.java, State.java, Zip.java and Phone.java) import java.util.Scanner; class Name implements Form
[Code] ....
It compiles at the moment but I get a null pointer exception in the main method of the FormFactoryDemo file.
But resource.returnString(r); gives a org.apache.jasper.JasperException: java.lang.NullPointerException I started the glassfish server in debug mode and found out that "resource" was null. but @PostConstruct in singleton does print which means singleton bean exists.
Can we call singleton beans with no interface in such a way form a session bean? I actually want to acquire instance of singleton bean when a client invokes method in Client bean...
I have inherited some code that is supposed to work just fine. The trouble is that when everything is rebuilt on my desktop, the projects crash. They all seem to crash at one particular part of code. I pass it a string and the "getResource" or "getContentClassLoader" is failing.
[URL] ....
I guess one way to tackle this is to break it apart into segments.
I have inherited some code that is supposed to work just fine. The trouble is that when everything is rebuilt on my desktop, the projects crash. They all seem to crash at one particular part of code.
I pass it a string and the "getResource" or "getContentClassLoader" is failing.
[URL] ....
I guess one way to tackle this is to break it apart into segments.
I have inherited some code that is supposed to work just fine. The trouble is that when everything is rebuilt on my desktop, the projects crash. They all seem to crash at one particular part of code. I pass it a string and the "getResource" or "getContentClassLoader" is failing.
I don't seem to be hitting my RESTful webservices. I am using Hibernate and checked and all my entity classes are working. I've even retrieved data from the database but I cannot hit the web service. I am using Tomcat 7 and Eclipse IDE.
