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  • Article: Interceptors 1.1 in Java EE 6

    - by OracleTechnologyNetwork
    This Tip Of The Day (TOTD) attempts to explain the basics of Interceptors 1.1 - a "new" specification introduced in the Java EE 6. Interceptors do what they say - they intercept on invocations and lifecycle events on an associated target class. The specification is not entirely new as the concept is borrowed from the EJB 3.0 specification.

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  • StackWrap4J Java wrapper

    - by Bill the Lizard
    The StackWrap4J 1.0.1 jar is now available! (See the changelog) Sample Code / Screen Shot The following code snippet was used to test the wrapper in the Android emulator: TextView text = (TextView)findViewById(R.id.output); StackWrapper stackWrap = new StackOverflow(); String displayText = null; try { Stats stats = stackWrap.getStats(); displayText = "Stack Overflow Statistics"; displayText += "\nTotal Questions: " + stats.getTotalQuestions(); displayText += "\nTotal Unanswered: " + stats.getTotalUnanswered(); displayText += "\nTotal Answers: " + stats.getTotalAnswers(); displayText += "\nTotal Comments: " + stats.getTotalComments(); displayText += "\nTotal Votes: " + stats.getTotalVotes(); displayText += "\nTotal Users: " + stats.getTotalUsers(); } catch(Exception e){ displayText = e.getMessage(); } text.setText(displayText); About StackWrap4J is a Java wrapper for the Stack Exchange API. It is designed to be easy to use, and intuitive to learn while providing the full functionality of the API. License StackWrap4J is available under the MIT license. Download StackWrap4J Platform StackWrap4J was built using Java 1.5 and tested on Sun's JVM. It should run on any implementation of the JVM (1.5 or later). It's also been tested on the Android emulator. It also runs under the Google App Engine. Code You can download the code from our SVN repository hosted on SourceForge. Documentation for the code is also available on the SourceForge site. Authors Bill Cruise Justin Nelson Contact Please feel free to leave feedback here in the Answers section or on the StackWrap4J project discussion forum. Alternatively: Bill is available at: lizard.bill (at) gmail.com Justin can be reached at: jjnguy13 (at) gmail.com Future Currently we are focusing on adding more tests and fixing bugs. We are also working on adding serialization so that our objects can be easily persisted, and throttling so that users of our library don't have to worry about breaking the terms of use of the API. Notes The latest build was tested against version 1.0 of the API on July 28th.

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  • Java hosting service provider?

    - by Rahul Utb
    I want to host a Java web application. How to decide which hosting service provider to choose from. Is there any source of info where from I can get such info. Yes most important, being from India which service provider service should I use, from those who say there servers are located in US or they who say their servers are located in India itself. Thanks in advance from any suggestion/reply to this query.

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  • Which Java-specific annoyance fixed in Scala reduces surprises like the ones discussed in Java Puzzl

    - by soc
    Example: In Java this code falls through and prints "Mhhh..." Integer i = new Integer(1); Integer j = new Integer(1); if (i == j) { System.out.println("Equal"); } else if (i < j) { System.out.println("Smaller"); } else if (i > j) { System.out.println("Bigger"); } else {System.out.println("Mhhh...");} In Scala the equivalent code does not even compile: val a = new Integer(1) val b = new Integer(1) println { if(a == b) "Equal" else if(a < b) "Smaller" else if (a > b) "Bigger" else "Mhhh..."}

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  • Problem by installing Java

    - by Shagun
    Yesterday night I was trying to download Java as per instructions given on http://developer.android.com/ .But I messed up somewhere and had to give up the thing. But since morning when ever I try to install or remove some thing I get the following response http://paste.ubuntu.com/1198084/ Please help fast. I am a newbie in android development and have to submit an app within 5 days from now for a project. And I need my linux machine working fine for that.

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  • Dependency Checker/ Installer With Java/Ant

    - by jsn
    I need some kind of software to easily roll out code on new servers. I use Apache Ant for builds. However, say I want to set-up a new server fast and my Java program depends on GhostScript, if there any software that can automatically check the computer for it (and then maybe the PATH) and add it if is not there? I have already looked at Maven and Apache Ivy, however, I think these are only for .jar files (from what I saw). Thanks for any help.

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  • Practicing Java Swing

    - by user1265125
    I've been learning Java by myself through many different online and offline resources. I just finished some basic practice and theoretical knowledge of Swing. Now, to become good at it I need some practice problems which would test my Swing skills, including GUI Building, listeners etc. But I can't figure out where to find such questions/problems for my practice. Do you guys know of an online resource? Some book would also do...

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  • C++ track or Java track in college?

    - by sq1020
    I'm starting some CS classes at a community college and they have two tracks. Either you take three courses in C++ or three courses in Java. Both cover the same fundamental material e.g. data structures, algorithms etc. Which would you recommend considering that I know python and may be consider doing a masters in CS some time down the road....my undergrad degree is in something else. And advice would be appreciated.

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  • Java based portal framework

    - by Jatin
    We have an application that needs to be built and are looking for some Java based portal framework. In last few days I have gone through over 10 different open source option LiveRay, JetSpeed2, GateIn etc. But they are all too complex to be judged so quickly. Can anyone suggest some framework which is ease to use but has the functionality to handle complex situations. Most importantly, the portlets will run flash/HTML5 contant. Thanks.

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  • Interconnect nodes in a Java distributed infrastructure for tweet processing

    - by David Moreno García
    I'm working in a new version of an old project that I used to download and process user statuses from Twitter. The main problem of that project was its infrastructure. I used multiple instances of a java application (trackers) to download from Twitter given an specific task (basically terms to search for), connected with a central node (a web application) that had to process all tweets once per day and generate a new task for each trackers once each 15 minutes. The central node also had to monitor all trackers and enable/disable them under user petition. This, as I said, was too slow because I had multiple bottlenecks, so in this new version I want to improve the infrastructure and isolate all functionalities in specific nodes. I also need a good notification system to receive notifications for any node. So, in the next diagram I show the components that I'll need in this new version: As you can see, there are more nodes. Here are some notes about them: Dashboard: Controls trackers statuses and send a single task to each of them (under user request). The trackers will use this task until replaced with a new one (if done, not each 15 minutes like before). Search engine: I need to store all the tweets. They are firstly stored in a local database for each tracker but after that I'm thinking on using something like Elasticsearch to be able to do fast searches. Tweet processor: Just and isolated component with its own database (maybe something like the search engine to have fast access to info generated by the module). In the future more could be added. Application UI: A web application with a shared database with the Dashboard (mainly to store users information and preferences). Indeed, both could be merged into a single web. The main difference with the previous version of the project is that now they will be isolated and they will only show information and send requests. I will not do any heavy task in them (like process tweets as I did before). So, having this components, my main headache is how to structure all to not have to rewrite a lot of code every time I need to access any new data. Another headache is how can I interconnect nodes. I could use sockets but that is a pain in the ass. Maybe a REST layer? And finally, if all the nodes are isolated, how could I generate notifications for each user which info is only in the database used by the Application UI? I'm programming this using Java and Spring (at least I used them in the last version) but I have no problems with changing the language if I can take advantage of a tool/library/engine to make my life easier and have a better platform. Any comment will be appreciated.

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  • Mixed java version installed

    - by david99world
    I've got the following in /.bashrc export JAVA_HOME=/usr/bin/jdk1.7.0_03/ export PATH=$PATH:/usr/bin/jdk1.7.0_03/bin This is fine, if I do $JAVA_HOME I get the directory above. The problem is if I do java -version I get... OpenJDK Runtime Environment (IcedTea6 1.11.1) (6b24-1.11.1-4ubuntu3) OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode) How do I make the official jdk version the right one? Sorry I'm extremely new to Ubuntu. Thanks, David

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  • JavaOne 2012 - Why Should I Switch to Java SE 7

    - by sowmya
    At JavaOne 2012, David Keenan and Staffan Friberg gave a presentation to answer why it is beneficial to update your production environment to Java SE 7. The following resources will help you learn more about JDK 7 features and facilitate a smooth transition: * Features and Enhancements and Known Issues * Compatibility with earlier releases * JDK 7 and JRE 7 Certified System Configurations * JDK 7 and JRE 7 Supported Locales * JDK 7 Adoption Guide * Information About 7 Update Releases - Sowmya

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  • executing .sh file from java program [migrated]

    - by user778900
    i have a .sh file stored in some linux system.the full path of the file is "/comviva/CPP/Kokila/TransactionHandler/scripts/stopTH.sh". i am tring to execute it by Runtime.getRuntime().exec("/comviva/CPP/Kokila/TransactionHandler/scripts/stopTH.sh"). but it is giving some exception. i want to execute that file from my java program in windows mechine. is it possible.?if yes then plese give me some code .. thanks koushik

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  • Beginner Scoring program button development in Java [migrated]

    - by A.G.
    I'm trying to add a "green team" to an example scoring GUI I found online. For some reason, the code compiles, but it runs with only the original two teams. I've tried playing around with the sizes/locations somewhat clumsily, and since no change was observed with these modications (NO change at ALL), I admit that I must be missing some necessary property or something. Any help? Here's the code: import javax.swing.*; import java.awt.Color; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; public class ButtonDemo_Extended3 implements ActionListener{ // Definition of global values and items that are part of the GUI. int redScoreAmount = 0; int blueScoreAmount = 0; int greenScoreAmount = 0; JPanel titlePanel, scorePanel, buttonPanel; JLabel redLabel, blueLabel,greenLabel, redScore, blueScore, greenScore; JButton redButton, blueButton, greenButton,resetButton; public JPanel createContentPane (){ // We create a bottom JPanel to place everything on. JPanel totalGUI = new JPanel(); totalGUI.setLayout(null); // Creation of a Panel to contain the title labels titlePanel = new JPanel(); titlePanel.setLayout(null); titlePanel.setLocation(0, 0); titlePanel.setSize(500, 500); totalGUI.add(titlePanel); redLabel = new JLabel("Red Team"); redLabel.setLocation(300, 0); redLabel.setSize(100, 30); redLabel.setHorizontalAlignment(0); redLabel.setForeground(Color.red); titlePanel.add(redLabel); blueLabel = new JLabel("Blue Team"); blueLabel.setLocation(900, 0); blueLabel.setSize(100, 30); blueLabel.setHorizontalAlignment(0); blueLabel.setForeground(Color.blue); titlePanel.add(blueLabel); greenLabel = new JLabel("Green Team"); greenLabel.setLocation(600, 0); greenLabel.setSize(100, 30); greenLabel.setHorizontalAlignment(0); greenLabel.setForeground(Color.green); titlePanel.add(greenLabel); // Creation of a Panel to contain the score labels. scorePanel = new JPanel(); scorePanel.setLayout(null); scorePanel.setLocation(10, 40); scorePanel.setSize(500, 30); totalGUI.add(scorePanel); redScore = new JLabel(""+redScoreAmount); redScore.setLocation(0, 0); redScore.setSize(40, 30); redScore.setHorizontalAlignment(0); scorePanel.add(redScore); greenScore = new JLabel(""+greenScoreAmount); greenScore.setLocation(60, 0); greenScore.setSize(40, 30); greenScore.setHorizontalAlignment(0); scorePanel.add(greenScore); blueScore = new JLabel(""+blueScoreAmount); blueScore.setLocation(130, 0); blueScore.setSize(40, 30); blueScore.setHorizontalAlignment(0); scorePanel.add(blueScore); // Creation of a Panel to contain all the JButtons. buttonPanel = new JPanel(); buttonPanel.setLayout(null); buttonPanel.setLocation(10, 80); buttonPanel.setSize(2600, 70); totalGUI.add(buttonPanel); // We create a button and manipulate it using the syntax we have // used before. Now each button has an ActionListener which posts // its action out when the button is pressed. redButton = new JButton("Red Score!"); redButton.setLocation(0, 0); redButton.setSize(30, 30); redButton.addActionListener(this); buttonPanel.add(redButton); blueButton = new JButton("Blue Score!"); blueButton.setLocation(150, 0); blueButton.setSize(30, 30); blueButton.addActionListener(this); buttonPanel.add(blueButton); greenButton = new JButton("Green Score!"); greenButton.setLocation(250, 0); greenButton.setSize(30, 30); greenButton.addActionListener(this); buttonPanel.add(greenButton); resetButton = new JButton("Reset Score"); resetButton.setLocation(0, 100); resetButton.setSize(50, 30); resetButton.addActionListener(this); buttonPanel.add(resetButton); totalGUI.setOpaque(true); return totalGUI; } // This is the new ActionPerformed Method. // It catches any events with an ActionListener attached. // Using an if statement, we can determine which button was pressed // and change the appropriate values in our GUI. public void actionPerformed(ActionEvent e) { if(e.getSource() == redButton) { redScoreAmount = redScoreAmount + 1; redScore.setText(""+redScoreAmount); } else if(e.getSource() == blueButton) { blueScoreAmount = blueScoreAmount + 1; blueScore.setText(""+blueScoreAmount); } else if(e.getSource() == greenButton) { greenScoreAmount = greenScoreAmount + 1; greenScore.setText(""+greenScoreAmount); } else if(e.getSource() == resetButton) { redScoreAmount = 0; blueScoreAmount = 0; greenScoreAmount = 0; redScore.setText(""+redScoreAmount); blueScore.setText(""+blueScoreAmount); greenScore.setText(""+greenScoreAmount); } } private static void createAndShowGUI() { JFrame.setDefaultLookAndFeelDecorated(true); JFrame frame = new JFrame("[=] JButton Scores! [=]"); //Create and set up the content pane. ButtonDemo_Extended demo = new ButtonDemo_Extended(); frame.setContentPane(demo.createContentPane()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(1024, 768); frame.setVisible(true); } public static void main(String[] args) { //Schedule a job for the event-dispatching thread: //creating and showing this application's GUI. SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } }

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  • How can I select which Java to use?

    - by user6611
    I have installed both OpenJDK 6 and 7. When I run "java somefile" from the command line, OpenJDK 6 is invoked. I do not want to change this default behavior. What command can I use to run my non-default OpenJDK 7 installation instead? (I am used to running "python somefile" to invoke the default Python, "python2.7 somefile" to use Python 2.7 specifically and "python3 somefile" to use Python 3 specifically.)

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  • How do I get the username in Java (ie, who -m in Java) (or Jython 2.1)

    - by amertune
    Here's the situation. I have a jython 2.1 script in a shared account that needs to know who is calling it. In bash, I can simply use 'who -m' and it will give me the correct username. I haven't been able to find anything in java (or jython) that would give me a similar result. Even trying to call Runtime.getRuntime().exec("who -m") doesn't do anything. When I try to read the InputStream from the process returned by exec, the stream is empty.

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  • ToolTip flicker in Java if outside JFrame? [closed]

    - by Skarion
    Hi! I am implementing ToolTip in Java as to make users having an easier time to use the product. Though tooltip that are at the borders of the JFrame and ends up outside the JFrame starts to "flicker". I've tried lots of things (like moving the tooltip so it should be inside the Jframe, controlling the painting so it ends up within the JFrame and so on) though it doesn't work. Anyone got any expertise within the field that know how to avoid this problem? Cheers, Skarion

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  • Object Oriented Design of a Small Java Game

    - by user2733436
    This is the problem i am dealing with. I have to make a simple game of NIM. I am learning java using a book so far i have only coded programs that deal with 2 classes. This program would have about 4 classes i guess including the main class. My problem is i am having a difficult time designing classes how they will interact with each other. I really want to think and use a object oriented approach. So the first thing i did was design the Pile CLASS as it seemed the easiest and made the most sense to me in terms of what methods go in it. Here is what i have got down for the Pile Class so far. package Nim; import java.util.Random; public class Pile { private int initialSize; public Pile(){ } Random rand = new Random(); public void setPile(){ initialSize = (rand.nextInt(100-10)+10); } public void reducePile(int x){ initialSize = initialSize - x; } public int getPile(){ return initialSize; } public boolean hasStick(){ if(initialSize>0){ return true; } else { return false; } } } Now i need help in designing the Player Class. By that i mean i am not asking for anyone to write code for me as that defeats the purpose of learning i was just wondering how would i design the player class and what would go on it. My guess is that the player class would contain method for choosing move for computer and also receiving the move human user makes. Lastly i am guessing in the Game class i am guessing the turns would be handeled. I am really lost right now so i was wondering if someone can help me think through this problem it would be great. Starting with the player class would be appreciated. I know there are some solutions for this problem online but i refuse to look at because i want to develop my own approach to such problems and i am confident if i can get through this problem i can solve other problems. I apologize if this question is a bit poor but in specific i need help in designing the Player class.

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  • Java: Executing a Java application in a separate process

    - by _ande_turner_
    Can a Java application be loaded in a separate process using its name, as opposed to its location, in a platform independent manner? I know you can execute a program via ... Process process = Runtime.getRuntime().exec( COMMAND ); ... the main issue of this method is that such calls are then platform specific. Ideally, I'd wrap a method into something as simple as... EXECUTE.application( CLASS_TO_BE_EXECUTED ); ... and pass in the fully qualified name of an application class as CLASS_TO_BE_EXECUTED.

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  • Java - java.util.List problem

    - by Yatendra Goel
    I have a java.util.ArrayList<Item> and an Item object. Now, I want to obtain the number of times the Item is stored in the arraylist. I know that I can do arrayList.contains() check but it returns true, irrespective of whether it contains one or more Items. Q1. How can I find the number of time the Item is stored in the list? ================================================================================== Q2. Also, If the list contains more than one Item, then how can I determine the index of other Items because arrayList.indexOf(item) returns the index of only first Item every time?

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  • Changing Java from OpenJDK to SunJava

    - by SpiXel
    I want to change OpenJDK to SunJava in my ubuntu linux desktop , i have downloaded the "jdk-7.tar.gz" from sun's website, but there problem is how to make the system to use the newly downloaded java ? I tried adding the new jdk/bin/java to my PATH ( from .bashrc ) but that seem not to work (cause probably OpenJDK's path is inside my PATH variable as well , so the system checks that first) Here's my JDK7 : /usr/lib/jdk7/bin/java Here's what $(which java) outputs : /usr/bin/java Thanks in advance

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  • Java kills sound on Karmic

    - by hasen j
    Every time I run a java application, one of two things happen: Either I lose sound in all other programs (even after quitting the java app) or if some other application is already playing sound, the said java app doesn't have sound Usually this can be fixed by running pulseaudio --kill from the command line, but it doesn't always work. Is there a way to fix this problem? This didn't happen before the upgrade to karmic. Other info: The java I'm using is Sun's Java

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