Java is a high-level, platform-independent, object-oriented programming language originally developed by Sun Microsystems. Java is currently owned by Oracle, which purchased Sun in 2010.

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107 views

What is the advantage of 'SwingUtilities.invokeLater()' method?

For the below sample GUI program using javax.swing, public class UnResponsiveUI extends JFrame{ private boolean stop = false; private JTextField tfCount; private int count = 1; /* ...
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168 views

Scheduling a few CPU-intensive tasks

I need to schedule a small number of CPU-intensive tasks to run every so often, reading from shared data and writing to dedicated buffers. I don't necessarily want to roll my own scheduling, but am ...
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131 views

How can I make a universal construction more efficient?

A "universal construction" is a wrapper class for a sequential object that enables it to be linearized (a strong consistency condition for concurrent objects). For instance, here's an adapted ...
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388 views

Fluent interface implementation and reflection. Case study

I hope I picked the right group for this question... I have this little framework I want to implement and I would like to have an opinion on it. In particular I am more concerned about the ...
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0answers
346 views

Design thoughts on a schema based request object for CXF endpoint

Trying to seek design suggestion on a schema based request object for a CXF endpoint. I've created a CXF SOAP endpoint which takes the following object as an input. The request object will have ...
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74 views

How to pass control between sub-controller to parent controller in Java MVC Design Pattern?

I'm pretty new in Java, but I've done plenty of research and I know what MVC is. However, to implement MVC in Java was a difficult task. I followed this tutorial, which helped me to realise that the ...
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52 views

Incorporating custom Algorithm in SOLR-LUCENE , before Indexing?

CURRENT FLOW: I am using a custom algorithm(presently in php) to rank the MYSQL records before INDEXING it to SOLR . WHAT I WANT : Is it possible implementing this ALGORITHM(may be in JAVA) inside ...
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95 views

How to efficiently handle related data in MVC?

Talking about MVC with servlets and JSP's, in a context about products and manufacturers , when querying the application for a list of products: the servlet loads a list of products from the ...
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125 views

Large Scale Application Development in Android

Since, I am fairly new to large scale app development in Android and Java, I though I would ask for your advice guys. My team was faced with developing a prototype of a fairly complex medical ...
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182 views

Embedded Tomcat Cluster

Can someone please explain with an example how an Embedded Tomcat Cluster works. Would a load balancer be necessary? Since we're using embedded tomcat, how would two separate jar files (each a ...
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145 views

Which patterns/architecture to apply for “Import Data, Process Data, Export Result”

I was wondering which architecture/patterns to choose for the following problem divided into three steps: Import TestScript Description from File (e.g. .xls, .txt) Process Described TestScript ...
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171 views

Benefits of EJBs over POJOs for Jersey JAX-RS Resources

I'm writing a Jersey 1.9 JAX-RS application. I have to use 1.9 because it's the only supported version. I'm trying to decide if there is any benefit to using EJBs as my Jersey Resources, rather than ...
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529 views

Thoughts on refactoring a generic DAO

I have designed a generic DAO in Java and am having confusion about whether to refactor it to different design or not. PS Don't say to use already existing 3rd person framework. I know there are some ...
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199 views

Single write, multiple read of stateful objects

Scenario: One data input feed (call this Source) Multiple objects (call these Layer1) read this Source, and analyze the feed. This analysis is stateful. Layer1 objects have configuration parameters. ...
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20 views

vert.x message bus architecture

A large part of the vert.x architecture is around the message bus, and message passing between verticals. The main idea I guess being that I can create multiple modules (possibly in multiple ...
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72 views

Dealing with several custom getters

I have a data structure with data units containing different types of data. I've wrapped the data in "Field" objects so that each field is able to independently parse user input in a desired way. ...
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36 views

Programmatically extending table/entity definition mappings through aspects in Spring and Hibernate

I would like to know if it is possible to use AOP to extend table/entity definitions so that I can add functionality across the board that requires persistence. Let me explain what I want to do with ...
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23 views

What does 'name' attribute signify in any java.awt component?

With the below program, am trying to find the names assigned to all the components part of the GUI. public class AWTCounter extends Frame implements ActionListener{ private Label lblCount; ...
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32 views

Transaction Management in Hibernate with DAO Design Pattern

I have many Tables, For every Table,we have DAO Interface and DAOImplementation class. Example DAO Interface public interface CancelPolicyDAO { public CancelPolicy insertCancelPolicy(CancelPolicy ...
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23 views

Design architecture and software for webapp integrating with few other endpoints (Email Server, Jira, CRM system)

In my upcoming project, I need to integrate a webapp with few other endpoints. Main duty of the webapp will be some kind of thin-client for inner JIRA system for company. Moreover, I'll need to ...
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98 views

How to micro-ify the middle tier in a Microservice Oriented Architecture?

Just read Fowler on Microservices and definitely recommend it. A big thing that is missing from this paper/approach is how to decompose the client-tier into "micro apps". By that, here's what I mean: ...
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131 views

How to design multiplayer online game with a battlefield?

I'm designing a simple game where all players use one battlefield via browser. I'm using websockets. So I'm wondering should I always send all data about battlefield to every user when smth is being ...
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16 views

webdav in jsr268 portal application

We have a web application that we have made portal compatible(JSR 268) using spring. One part that has not been ported across is a WebDav servlet. Is it possible to have a portlet handle WebDav? or ...
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34 views

Java API initialization step

I am developing an Android Library which involves both Network and Bluetooth communication. In order to start using the library it must be configured. In other words a request to the backend must be ...
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26 views

Designing Document class for Doc Imaging - optional fields

I'm working on a project that processes many Documents. A Document CAN have a Cover Sheet (if the first page is one) A Document CAN have a Stub (if Document is large) It matters whether or not a ...
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135 views

Do thin fluent builder method chains have any need to be “extensible”?

In an environment where refactoring is difficult extensibility can be a life saver. However, this is no excuse to over engineer code. Given that a thin fluent builder method chain is backed by well ...
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48 views

Mixing newable and injectable in a Callable

I recently read http://misko.hevery.com/2008/09/30/to-new-or-not-to-new/ which discussed newable vs injectable objects. What would you do if you needed to make a Callable that talks to some service ...
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115 views

How far to go when future proofing fluent-method-chained-DSL test code?

Is it worth implementing interfaces, or using the getThis() trick, or even static factory methods to future proof against the need to extend this DSL? The current design is a pair of thin ...
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46 views

Apache Wicket, updating data without using a form, is it safe?

I have a ListUser.java class with a datatable, displaying UserData information, displays 4 columns, the last column is an AbstractColumn that has on it's populateItm method has added a inner class ...
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50 views

Avoiding IllegalStateException in MVP when view is not ready yet

In an effort to improve my coding skills I am trying to make use of the MVP pattern in one of my first Android applications. It is going well but I have hit one issue that I am not sure what is the ...
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54 views

Can PhoneGap and RoboVm work in harmony?

The Goal is to make an iOS app using phonegap and java. When writing phonegap plugins that interact with native code (objective-c) would it be possible instead to make it interact with java when using ...
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58 views

MVC class modeling

I have following requirement and I am trying to design class diagram. This is the first time I am creating class diagram so I would like to get some advice from experts.. :) This is a simple login ...
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58 views

Confusing project dependencies

I have a project for my main application and some projects for modules that are used by this application. Following I will reduce it to the main project and one module project. Both projects share ...
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34 views

Remote limitations of hg4j?

I’m evaluating hg4j to see if it’s useable in my current project. I need a (preferably) pure Java hg library that can: Check out a working copy of a remote hg repo at, say, ...
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145 views

Dynamically add/remove components to/from panel

I'm in a little planning phase of my java/swing project. Here is a picture: It is a main panel containing several sub panels depending on the selected date in the top center. I want to browse those ...
0
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189 views

Android From Local DB (DAO) to Server sync (JSON) - Design issue

I sync data between my local DB and a Server. I'm looking for the cleanest way to modelise all of this. I have a com.something.db package That contains a Data Helper and couple of DAO classes that ...
0
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409 views

Multidimensional multiple-choice knapsack problem: find a feasible solution

My assignment is to use local search heuristics to solve the Multidimensional multiple-choice knapsack problem, but to do so I first need to find a feasible solution to start with. Here is an example ...
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68 views

Declarative Transactions in Node.js

Back in the day, it was common to manage database transactions in Java by writing code that did it. Something like this: Transaction tx = session.startTransaction(); ... try { tx.commit(); } catch ...
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77 views

Appropriate design / technologies to handle dynamic string formatting?

recently I was tasked with implementing a way of adding support for versioning of hardware packet specifications to one of our libraries. First a bit of information about the project. We have a ...
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0answers
55 views

URL and Controller structure for parent-child-relationship

I use an MVC web framework to create an application which contains a hierarchy: Location <1-N> Devices <N-M> Services I have a number of Locations. Each Locations can have several ...
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0answers
594 views

Spring bean injection into a hibernate validator constraint

I have a controller method like listed below whose argument is annotated with @Valid to validate PasswordChange object using a Hibernate validator @Constraint. Both PasswordChange and a sample ...
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55 views

Specific class to pass a bundle of data from my Model to Controller or a simple Collection?

I am doing an Invoice application implementing MVC pattern design in Java. One of the features my application has to have is showing all info about a Customer: Personal data, Calls, Invoices, ...
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73 views

Suggestion to Design API Centric Application using Appengine

I have been planning to create an new application. So I was designing the application structure.i know this application will be accessed form multiple devices and the app feature will be increased. ...
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84 views

how to separate the logic of different views when using android viewFlipper?

I use a ViewFlipper in a dialog. I want to fetch the data from the EditText in both of them and also add click listeners to both of them. I can write the whole code in one big file, but i want to ...
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103 views

Rich console UI

There are bunch of console programs and especially games using full redraw (not sure ho this correctly named) of console window. For example, look at output of linux top program -> ...
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92 views

Algorithm / working approach to get a random list of data

I am working on a android schedule app but that isn't matter , the problem is a algorithm / methodology so you are welcome to just write the pusedo code to answer. The data is like this Place ...
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0answers
446 views

Make a java program use more processors

I am running a program that is supposed to solve a problem with the brute force approach. My computer has a quad-core CPU. When I run the program clearly java uses only one core, because in my ...
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35 views

Is there a good idiom for handling an in-line startActivityForResult

I have a bunch of Java code that looks something like this. //Global boolean something_result; Monitor something_monitor; // Some class on worker thread Intent intent = new ...
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95 views

Succinct Lazy Initialization Pattern

Background I often use the following lazy initialization pattern: public class Clazz { private Object object; private Object getObject() { Object object = this.object; if( object == ...
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56 views

delegate classes for UI events

When designing a delegate to represent the state of a UI (java swing) what is cleaner: to manipulate the delegate directly from the custom event handlers defined in the UI code, or to register the ...