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  • Smallest executable for Windows

    - by Andrew Warren
    Hi I need to create a very simple GUI application for Windows(open a file, do some changes based on user input, upload the file to an intranet server). The client company has the latest release versions of Java SE, .NET and Adobe AIR installed on all their machines. And their #1 requirement is to have the smallest possible package for xcopy deployment. So which of the 3 listed platforms should I use? Another option of course is a native exe. Thanks, Andrew

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  • Android Color Picker

    - by GuyNoir
    Does anyone know of a quick color picker widget that I could grab to use in my application? I've seen one in a few different applications that has a wheel with colors, and that you tap in the center to select, but I'm not sure where to find it. Google brings up nothing. Any color picker would be fine though. Thanks.

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  • Eclipse doesn't build

    - by Christian
    A previously working Ecplise now gives me the error Java Virtual Machine Launcher Could not find main class: testing2. Program will exist. testing2 is my class and a source file exists but Ecplise doesn't seem to build the .class file. Maybe I hit the wrong hotkey and changed accidently some setting?

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  • Accessing the Private Constructor

    - by harigm
    I am java developer, went for an interview. I have been asked a question about the Private constructor 1) Can I access a Private Constructor of a Class and Instantiate the class. I was thinking and gave the answer directly--- "NO" But its wrong, can any one help Why NO? and How we can achieve this

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  • Apache BeanUtils.copyProperties is spilling too much log

    - by Ravi Gupta
    How can I switch off logging for BeanUtils.copyProperties ? It creates way too much logs and hampers the log file readability. Thanks heaps.. Sample code BeanUtils.copyProperties(someDataobject,someActionForm); In the log I see hunders of lines like below EBUG org.apache.commons.beanutils.PropertyUtils - setSimpleProperty: Invoking method public void someMethod(java.lang.String) with value null (class ) 2010-03-23 18:53:23,134 DEBUG org.apache.commons.beanutils.BeanUtils - copyProperty(someActionForm@13e38a7, someValue, )

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  • Latest evoluations in web content display

    - by srinannapa
    I Would like to know about the latest techiniques ,how the content is managed in web-pages ( I use Java technology). Probably i'm expecting like an RSS feed ,is one among them i can implement in my webpages. I need some more latest technologies of this kind to implement in web pages. Srinivas

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  • Is this (Lock-Free) Queue Implementation Thread-Safe?

    - by Hosam Aly
    I am trying to create a lock-free queue implementation in Java, mainly for personal learning. The queue should be a general one, allowing any number of readers and/or writers concurrently. Would you please review it, and suggest any improvements/issues you find? Thank you. import java.util.concurrent.atomic.AtomicReference; public class LockFreeQueue<T> { private static class Node<E> { E value; volatile Node<E> next; Node(E value) { this.value = value; } } private AtomicReference<Node<T>> head, tail; public LockFreeQueue() { // have both head and tail point to a dummy node Node<T> dummyNode = new Node<T>(null); head = new AtomicReference<Node<T>>(dummyNode); tail = new AtomicReference<Node<T>>(dummyNode); } /** * Puts an object at the end of the queue. */ public void putObject(T value) { Node<T> newNode = new Node<T>(value); Node<T> prevTailNode = tail.getAndSet(newNode); prevTailNode.next = newNode; } /** * Gets an object from the beginning of the queue. The object is removed * from the queue. If there are no objects in the queue, returns null. */ public T getObject() { Node<T> headNode, valueNode; // move head node to the next node using atomic semantics // as long as next node is not null do { headNode = head.get(); valueNode = headNode.next; // try until the whole loop executes pseudo-atomically // (i.e. unaffected by modifications done by other threads) } while (valueNode != null && !head.compareAndSet(headNode, valueNode)); T value = (valueNode != null ? valueNode.value : null); // release the value pointed to by head, keeping the head node dummy if (valueNode != null) valueNode.value = null; return value; }

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  • How to create encrypted Jar file?

    - by Kartik Mistry
    I am working on project that must need to protect data (revealing code is not main problem) files. We are using Java + Netbeans. Is there any facility that will create jar in encrypted format? We are also using sqlite for database - so putting text file in encrypted format is not proper option for us too.

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  • getting started with nosql

    - by radi
    hi , i am new to nosql world i know sql and rdbms very well , i want to get start with nosql so i need to know : where i can start read about nosql (books , online tutorials )? what is the most simple nosql engine i can start with (i am using java)? thanks .

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  • Installing Android SDK

    - by VBeginner
    I'm relatively new to Java development and never installed an SDK before. I have Eclipse and downloaded the Android SDK. It says I have Android SDK tools installed. Not sure what I'm doing wrong. I also just downloaded NetBeans. Is NetBeans compatible with Android SDK? I'm so lost. Thanks.

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  • debugging JBoss 100% CPU usage

    - by NateS
    Originally posted on Server Fault, where it was suggested this question might better asked here. We are using JBoss to run two of our WARs. One is our web app, the other is our web service. The web app accesses a database on another machine and makes requests to the web service. The web service makes JMS requests to other machines, aggregates the data, and returns it. At our biggest client, about once a month the JBoss Java process takes 100% of all CPUs. The machine running JBoss has 8 CPUs. Our web app is still accessible during this time, however pages take about 3 minutes to load. Restarting JBoss restores everything to normal. The database machine and all the other machines are fine, only the machine running JBoss is affected. Memory usage is normal. Network utilization is normal. There are no suspect error messages in the JBoss logs. I have set up a test environment as close as possible to the client's production environment and I've done load testing with as much as 2x the number of concurrent users. I have not gotten my test environment to replicate the problem. Where do we go from here? How can we narrow down the problem? Currently the only plan we have is to wait until the problem occurs in production on its own, then do some debugging to determine the cause. So far people have just restarted JBoss when the problem occurred to minimize down time. Next time it happens they will get a developer to take a look. The question is, next time it happens, what can be done to determine the cause? We could setup a separate JBoss instance on the same box and install the web app separately from the web service. This way when the problem next occurs we will know which WAR has the problem (assuming it is our code). This doesn't narrow it down much though. Should I enable JMX remote? This way the next time the problem occurs I can connect with VisualVM and see which threads are taking the CPU and what the hell they are doing. However, is there a significant down side to enabling JMX remote in a production environment? Is there another way to see what threads are eating the CPU and to get a stacktrace to see what they are doing? Any other ideas? Thanks!

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  • Treeset to order elements in descending order

    - by Gaurav Saini
    Here is the piece of code that I have used for Java 5.0 TreeSet<Integer> treeSetObj = new TreeSet<Integer>( Collections.reverseOrder() ) ; Collections.reverseOrder() is used to obtain a comparator in order to reverse the way the elements are stored and iterated. Is there a more optimized way of doing it?

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  • What exactly is Spring for?

    - by Maksim
    I hear a lot about spring, people are saying all over the web that Spring is good framework for web development. But what exactly is it for? How can I use it for my Web-Java application any examples.

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  • Deploy web service on Tomcat with OpenEJB

    - by kostya
    Hi, I need to deploy web service on Tomcat with installed OpenEJB. I compiled simple Hello service that just prints "Hello" with JAX-WS and tried to deploy on tomcat, but got errors while deployment : ERROR - Error deploying CXF webservice for servlet helloservice.endpoint.Hello java.lang.IllegalArgumentException: Could not find servlet helloservice in web application context /helloservice Please, help what is done wrong here. Is tomcat + openejb is sufficient for web service deployment? Thanks.

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  • Stand-alone Bytecode Verifier

    - by HH
    In my bytecode instrumentation project, I stumble frequently on VerifyErrors. However, the default java Verifier gives little information on which instruction resulted in the error (it only gives the method and a small message). Is there any stand-alone bytecode verifier which provides with a little more advanced help in locating the error, at least the precise instruction location? Thank you.

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  • How can I prevent PermGen space errors in Netbeans?

    - by DR
    Every 15-30 minutes Netbeans shows a "java.lang.OutOfMemoryError: PermGen space". From what I learned from Google this seems to be related to classloader leaks or memory leaks in general. Unfortunatly all suggestions I found were related to application servers and I have no idea to adapted them to Netbeans. (I'm not even sure it's the same problem) Is it a problem in my application? How can I find the source?

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  • Method overriding

    - by Gandalf StormCrow
    Can you override method in java without using annotations? Because eclipse doesn't support it if you use JRE6, you need to switch back to 5 to use @Override annotation. Will this method be overriden if I remove the annotation? @Override public String toString() { return name + " [" + genre + "]"; }

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  • pixel difference

    - by J J
    i m a beginner in java programming. i have to submit project of server- client and stuck in pixel comparision .acc to code it accepts buffered image and compares pixel how to store pixel difference in 2nd image itself and return it?? do help with code?

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