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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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• 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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• 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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• roundoff double values in Java

  - by S.PRATHIBA

  Hi all, I have a matrix.I found the 10th power of matrix using Java.After finding the 10th power,I need to round off the double values to 3 decimal places.Please help me to round off the double values in the matrix to 3 decimal places.

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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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• 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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• 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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• 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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• Do you find java.util.logging sufficient?

  - by Yuval A

  Per the title, do you find the default Java logging framework sufficient for your needs? Do you use alternative logging services such as log4j or others? If so, why? I'd like to hear any advice you have regarding logging requirements in different types of projects, and when integrating frameworks is actually necessary and/or useful.

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• Install Java EE 6

  - by C. Ross

  I'm trying to install the Java Enterprise Edition 6 on my workstation. I downloaded the installer from the Sun website. Whenever I get to the option in the installer "JDK Selection" I'm told to manually select a JDK. I gave it my path (C:\IBM\rad7\jdk\), and was told it is invalid. What do I need to do to successfully install JEE6?

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• Creating an invisible button in Java Swing

  - by AniDev

  Hello, I have seen many times on Java Swing GUIs buttons that look like images until the mouse rolls over them. They appear to not have their content area filled. When the mouse rolls over them, the content area fills in but the button looks as though the mouse is not hovering over it. An example of this would be the toolbar of buttons used to activate each demo in SwingSet2. How is this effect possible? Thanks!

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• Sample xml configuration for log4j, have a 'main' java application and want to write to file

  - by Blankman

  Are there any example log4j configuration files (XML). I have a java main application. I want log4j to output to console AND write to file. Any examples of this would be greatly appreciated. I'm using netbeans if that matters.

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• Double to scientific notation in java

  - by Daniel G. R.

  Hi everyone, I have a double number like 223.45654543434 and I need to show it like 0.223x10E-3 for example, how can I do it in java???????? URGENT!!!!!!!!!!! thanks!

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• Possible memory leaks in the Java Development Work

  - by harigm

  Can any one let me where the memory leaks can happen when we are developing Java based application. I am aware of Database but apart from that, is there any other possible ways . Please list the scenarios

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• Naming conventions for complex getters in Java

  - by Simon

  Hi there! I was reading this C# article about the usage of properties and methods. It points out why and when to use properties or methods. Properties are meant to be used like fields, meaning that properties should not be computationally complex or produce side effects I was asking myself how you could express this difference in Java, where you only use getters for the retrieval of data. What is your opinion?

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• Java - Incrementing through IP addresses in String format

  - by Matt

  I'm new to java and i'm trying to find a way of incrementing through an user input IP address range. For example from 192.168.0.1 to 192.168.0.255. However the way my application works at the moment is the take the from and to ip addresses as a String. Is there a way I can increment through all the ip addresses the user input from and to? Hope this makes sense and please dont flame me, I have looked for an answer!

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• Convert string from UTF-8 to ISO 8859-1 in Java

  - by Derk

  I want to encode a UTF-8 string to a ISO 8859- string in Java I have this: String title = new String(item.getTitle().getText().getBytes("ISO-8859-1")); But it isn't working, the output is Sørensen for example

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• Parallel Web Service Calls in Java

  - by java_pill

  Is there anyway to make web service calls from a Java client app. (Apache Axis based) in parallel? Does async style Web Service client (Apache Axis based) help?

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• Java Packages in Seperate repository than others

  - by sethxian

  I was wondering if it's possible to have a java package setup using a different subversion repository than the rest. Ideally, I would probably go with a different library project, but in the case of BlackBerry, the 3rd party library linking does not work well, so I would like to just separate my UI package into a different repository than the rest so that I can control the UI better for different OS versions, but leave all the other packages the same. Is this 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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• 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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• Problem in java.util.Set.addAll() method

  - by Yatendra Goel

  I have a java.util.Set<City> cities and I need to add cities to this set in 2 ways: By adding individual city (with the help of cities.add(city) method call) By adding another set of cities to this set (with the help of cities.addAll(anotherCitiesSet) method call) But the problem in second approach is that i don't know whether there were any duplicate cities in the anotherCitiesSet. I want to do some processing whenever a duplicate entry is tried to be entered in thecities set.

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• Wait For Return Key Press Using Java Scanner

  - by Gordon

  What would be the best way to wait for a return key press from the user using the Java Scanner Class? In a command line tool I would like the user to confirm before carrying out an action. Please correct me if there a more standard way of doing this in a command line tool.

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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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• 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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