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• java hashmap flaws ?

  - by Tiberiu Hajas

  hi there, if (agents != null) for (Iterator iter = agents.keySet().iterator(); iter .hasNext();) { // some stuffs here } I have the following piece of java code, the agents is a hashmap, wondering if anyone can figure it out why on the line with "for" statement sometimes I got NPE ? is there any flaw with hashmaps ? thanks

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• Java development in Ubuntu

  - by Veera

  I'm a newbie to Linux systems and recently I started using Ubuntu 10.04. When I do java development in Windows, I usually keep my project files under some drive (D: for example) and under my development folder, such as D:\projects\myproj. But I'm bit confused with Ubuntu's folder structure. So, I just want to know how do you organize your projects in Ubuntu? Under which folder do we keep our projects file?

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• Reading barcodes from Java

  - by santiagobasulto

  Hello everyone. I'm dealing with a barcode reader in my java app. The problem is that the barcode, before and after reading and sending the actual barcode, sends a return code. I've some JTextFields and when the reader reads the barcode it change the focus, and then sends another return that makes the window to close. Is it anyway to "intercept" those "return" commands ?

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• Updated resource for java performance tuning

  - by JVA

  Can anyone recommend a web site that includes up to date performance tips for Java? Most of the sites I have found seem to be old and I guess the newer versions (1.5 - 1.7) may have obsoleted some recommendations.

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• Monitoring application to monitor a Java desktop application performance

  - by TacB0sS

  Hey, I have a Java desktop application I wrote, and I would like a recommendation about a monitoring application that can spot bottlenecks in the code and real time memory consumptions. As I was developing for J2Me, the WTK then, had a memory monitor, and I found it really useful, I would like to know which monitoring program you think is best to use. Thanks, Adam.

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• Easy XML Serializer for Java

  - by sdoca

  I'm looking for a way to serialize Java objects into XML for use by a RESTful web service. I don't have an XSD. I have looked at the following: JAXB - fairly heavy weight with annotations required on classes and also an ObjectFactory class and/or a jaxb.index file Simple - requires annotations but no other config classes/files. Unfortunately it can't serialize Sets. XStream - no annotations etc. required, but doesn't support generics Does anyone else have any suggestions?

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• Common Ancestor to Java Array and List

  - by Phuong Nguyen de ManCity fan

  In .NET, both array and list have Enumerable as ancestor, so a method that accept Enumerable as an argument can receive both array and list as its argument. I wonder if there is a similar thing in Java?

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• java code for converting videos into byte arrays

  - by Akhil

  I am looking for a easy to use library in java that can convert a video into arrays(corresponding to frames). Arrays will be used for frame processing with standard algos like GMM

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• Java: What is the best way to SFTP a file from a server

  - by davidhayes

  What is the best was to retrieve a file from a server using SFTP (as opposed to FTPS) using Java? I'll leave the particular definition of best up to you but in my mind it should include free :)

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• Applying a patch from java.net

  - by user354414

  I have a problem with Jaxb enumerations that is related to this bug https://jaxb.dev.java.net/issues/show_bug.cgi?id=708 A patch has been supplied to the issue that can resolve the problem. How can I apply this patch to resolve my problem

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• Acquiring drive names (as opposed to drive letters) in Java

  - by Mattijs

  Hi, On my Windows machine, my main hard drive has the letter C: and the name "Local disk". To list the drive letters in Java on Windows, the File object has the static listRoots() method. But I can't find a way to acquire the drive names (as opposed to the drive letters) on Windows. Has anyone tried this before? Thanks, Mattijs

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• Java Applet Authentication

  - by user265536

  I have Java Applet(J2EE), I want to make it accessible only to a certain set of users,by authenticating them using username and password.What is the the best way of doing this?

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• Multiple Layout Managers in Java

  - by ranzy

  Is there way to use more than 1 layout manager in Java. Right now I'm using a gridLayout to implement a chess board but beneath it I would like to put some other stuff but not in a gridLayout. Maybe a FlowLayout or some other layout. How would I go about doing this? Thanks!

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• Reactive Extensions for Java

  - by Timo Westkämper

  Is there any equivalent of Reactive Extensions (.NET) for Java? About Rx (Reactive Extensions) Rx is a library for composing asynchronous and event-based programs using observable collections. I am aware of rule engines such as Drools from JBOSS, but is there some other way that is closer to the Microsoft .NET approach?

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• reading a text file in java

  - by aks

  I want to read a text file containing a space sepearted vlaues.Values are integers. How can i read it and put it in a array list?? eg of contents of texx file 1 62 4 55 5 6 77 now i want a arraylist as [1, 62,4,55,5,6,77]. How do i do it in java?

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• How do I determine which methods are used by a Java class

  - by Paul Butcher

  I need to provide a report of which APIs are used by our code. For a Windows DLL, I would use "dumpbin /imports" - is there an equivalent for a Java .class file? javap seems to be the obvious place to look, but I can't find any options that seem to do what I'm after. Thanks!

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• Good concurrency example of Java vs. Clojure

  - by Michiel Borkent

  Clojure is said to be a language that makes multi-thread programming easier. From the Clojure.org website: Clojure simplifies multi-threaded programming in several ways. Now I'm looking for a non-trivial problem solved in Java and in Clojure so I can compare/contrast their simplicity. Anyone?

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• Properly match a Java string literal

  - by Fork

  Hi, I am looking for a Regular expression to match string literals in Java source code. Is it possible?

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• Java portal architectural considerations

  - by Woot4Moo

  Currently there exists a need to create an application that will serve 5 different customers each requiring their own specific URL and content repository. My question is when designing this application what should my considerations be for protecting the content of the individual customers while meeting the requirements of the unique URL. The system will be sitting on Windows with a postgres database and java as the implementation language.

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• A question taken from Java exam

  - by chun

  public static void main(String[] args) { int [][]shatner = new int[1][1]; int []rat = new int[4]; shatner[0] = rat; System.out.println(shatner[0][3]); } surprised, The answer is 0, Java doesn't check this kind of indexOutOfBound error?

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• Running a Java program with input from a file

  - by Katy

  I am writing a program that reads the input from a file and then prints it to the screen. When I run it without taking the input from the file, it works perfectly fine. However, every time I try to run it from the file it gives me an "Exception in thread "main" java.util.NoSuchElementException: No line found at" error that occurs every place the input is suppose to be read. I have no idea what is going on.

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• Get system information using java (embedded in a page)

  - by Anant

  Is there any way I can get system info, like processor/ram etc (preferably cross platform, in browser)? I am looking to implement this in a website, so I need it in either flash or a java applet.

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• couldn't start a java application as a windows service

  - by rgksugan

  I have written a java application which is a RMI server. I need to start rmiregistry to run this application and i also want my apllication to start automatically when the system starts. I have converted my application into a windows servise. When i try to start my service it shows this error Error 1067: The process terminated unexpectedly Is it because my program throws an exception when my application is started before the rmiregistry is started.

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• Maximum heap space constraints in java

  - by Christian

  I have a program that needs a lot of memory and want to set the maximum heap space at 6024MB. Java gives me the error: Invalid maximum heap size: -Xmx6024m The specified size exceeds the maximum representable size. Is there a workaround?

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• Wrapper class for HttpGet / Post in Java?

  - by Tim Green

  Hi, Sorry, I'm quite new to Java. I've stumbled across HttpGet and HttpPost which seem to be perfect for my needs, but a little long winded. I have written a rather bad wrapper class, but does anyone know of where to get a better one? Ideally, I'd be able to do String response = fetchContent("http://url/", postdata); where postdata is optional. Thanks!

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