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• What should I learn first, Spring or Hibernate?

  - by mamamambo

  Hi guys, I've just started learning Struts and I'm trying to be marketable for a good job as a Java programmer. My next decision would be choosing which to learn next, Spring or Hibernate? Also do you guys have any suggestions or tips for me to be good? Thanks in advance!

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• how to change swing look and feel in netbeans

  - by radi

  i am new to netbeans ide , i have a swing desktop application and i want to change the default java look and feel (for it) to substance look and feel ( or other) , so how to add substance jar file to my project (i want to deploy the project to jar file) , and set a look and feel from it . thanks

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• When removing inside foreach, do we need to step back

  - by Pentium10

  Take this Java code: for (ContactsReduced curContact : allcontacts) { .......... allcontacts.remove(curContact); } I do based on a condition a remove, will the foreach miss the next item in order, and do we need to step back(somehow)?

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• Best way to mark an inherited class as NOT serializable

  - by initialZero

  If I inherit from a class that is serializable but I specifically do not want my class to be serializable; what's the best way to strictly prevent serialization? If there was a method in java.io.Serializable maybe I could throw an exception, but Serializable is empty.

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• Uploading single files to the Appengine installation

  - by judekm

  Is it possible to upload single files to the Appengine installation instead of the full project every time. This question is related to the Java version of Appengine.

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• Digital self-signed certification update expiry date

  - by user309281

  Hi all, I have a self-signed digital certificate created using java keytool command. Can i update only the expiry date of the keystore file, without creating new keystore? Pls help

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• Can we develop very good looking UI in swing and if not what are alternatives

  - by Shekhar

  Hello In my current project we have to develop a good looking desktop based application in java. Currently, we have a very basic desktop application written in swing and team does not have good swing knowledge. Can we create a very good looking UI in swing? Should we use JavaFX for creating the desktop application? What are other alternatives to do this? Thanks Shekhar

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• Any gotchas in migrating database connectivity to DataSource?

  - by Everyone

  Looking at some old application code which uses explicit driver loading as Class.forName(...).newInstance I have been told to change this to use the Java 1.4.2 mechanism to establish a database connection using ContextLookup, and DataSource. Are there any gotchas I should be aware of?

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• How to test internet speed (JavaSE) ?

  - by Mr CooL

  Is there a way to test internet speed using Java code? For instance, like how we actually test with cmd command, ping command. Thanks in advance...

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• Ajax frameworks small apllication

  - by Mona

  hi. I'm wondering if any of you have some ideas of a small application i can work on , just to get familiar with any of the Ajax Frameworks specially if it's related to Java like JMaki or ECHO 2 thanks .

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• Why do I get UDP datagrams out of order even with processes runnning locally?

  - by Bilthon

  Well, I'm developing a java interface between a streaming server and a flash client. I noticed that UDP datagrams can reach my interface out of order even if both processes are running locally. Is that normal? I thought that as no datagram has to go through any router or any network device, then that should not be happening. Thanks in advance Nelson R. Perez

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• Convert Existing Eclipse Project to Maven Project

  - by Tom G

  For a project at work, we're considering using the Maven plugin for Eclipse to automate our builds. Right now the procedure is far more complicated than it ought to be, and we're hoping that Maven will simplify things to a one-click build. My question is, is there a wizard or automatic importer for converting an existing Eclipse Java project to a Maven project, using the Maven plugin? Or should I create a new Maven project and manually copy over all source files, libs, etc.

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• How to use DL Query programmatically

  - by Mikae Combarado

  Hello, I would like to know whether I can use DL Query in Protege programatically. Is it possible to enter a query in java and retrieve individuals like how it is done in SQL ? E.g. Query : hasCalorificContentValue value 723 and I would like to retrieve an individual called QuattroFormaggio.

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• How to sort 100GB worth of strings.

  - by Christian

  Given a harddrive with 120GB, 100 of which are filled with the strings of length 256 and 2 GB Ram how do I sort those strings in Java most efficiently? How long will it take?

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• Call JNI methods that were not written for your class

  - by JT

  It seems that JNI methods need to be written with the Java class signature built in to them. I want to call a JNI method that I didn't write. Can I call a native method on a library that was not written with my class in mind?

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• When would you put a semicolon after a method closing brace?

  - by froadie

  I've been programming in Java for a while, and I've just come across this syntax for the first time: public Object getSomething(){return something;}; What's interesting me is the final semicolon. It doesn't seem to be causing a compiler error, and as far as I know isn't generating runtime errors, so it seems to be valid syntax. When would I use this syntax? Or is it just something that is allowed but generally not used?

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• Get length of bits used in int

  - by sigvardsen

  If you have the binary number 10110 how can I get it to return 11111? e.g a new binary number that sets all bits to 1 after the first 1, there are some likewise examples listed below: 101 should return 111 (3 bit length) 011 should return 11 (2 bit length) 11100 should be return 11111 (5 bit length) 101010101 should return 111111111 (9 bit length) How can this be obtained the easiest way in Java? I could come up with some methods but they are not very "pretty".

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• How to change HEX value to EBCDIC char

  - by vininet

  What is the simplest way to convert HEX value to ebcdic char type in Java e.g. The example below will return at sign but I would like to get ebcidic equivalent i.e. space char.. String hex = "40"; char c = (char) Integer.parseInt(hex, 16);

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• Good use of recursivity in chess programming?

  - by JDelage

  Hi, As part of a homework assignment, I have to program a simple chess game in Java. I was thinking of taking the opportunity to experiment with recursion, and I was wondering if there's an obvious candidate in chess for recursive code? Thank you, JDelage

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• What tech needed to run JSP and Servlets?

  - by Mike

  If I want to build a site with PHP, all I have to do is install the PHP package and make sure mod_php is enabled in my apache web server. Voila! a PHP environment. Now, if I want to build a site with equivalent Java tech, i.e. JSP and Servlets, What do I have to install?

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• Reading all compile errors in Windows command-line?

  - by ArdillaRoja

  Noob question, apologies. I'm compiling Java in Windows Vista's command-line and have so many syntax errors that some are being pushed off the top (a lot of 'class, interface or enum expected' errors which leads me to believe it's an obvious syntax mistake early on in the code that I can't spot). Does anyone know how I could get it to display those first errors? Thanks in advance for the help.

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• What are the optimal checkstyle settings for MethodLength and FileLength?

  - by Daniel Alexiuc

  I am starting a new Java web project that will be worked on by up to 10 developers. It will probably be hard to change once the codebase grows large, so what are the best checkstyle settings to use for methodLength and fileLength?

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• app engine jpa N-way joins ?

  - by cometta

  may i know is the latest version of jgae support N-way joins? or still limit to 2-way join? reference: http://gae-java-persistence.blogspot.com/2010/03/executing-simple-joins-across-owned.html?showComment=1276491851890_AIe9_BEqp-CCn0bibiOUY8JUbbSFwFE02aF9d68baX0squIcfBnve8K3iIT3IEhPhpJxEBSZQLlz8tH-NMq1XGzOV0fAA8othN4f3zhR2B6xN0WzsTRpyEZJl2vPDonhVY38iUhJGe8Ot9URs3IjYk4HoH9LG41az7l0blTBNNnpJuyI-xl5CDJGoPLGk5jw4tLvtvsCYhq3n7XuiZwJIaBMWjHSDdy7-fB1NYszI0G4f9JRjZ5UdDM4at3o3tAhd-CYK2Af1dnG#c3679507832415682306

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• Has anybody integrated generated code from beanwizard.com?

  - by clb180

  Has anybody integrated Java code generated from beanwizard.com? Wondering if it works well and is worth it...

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• Hibernate tool to create basic mappings based on a mysql db

  - by Blankman

  Are there any tools that can look at a database, and generate the basic mapping files? It would be great if it could take a database, and create the actual model (java classes) with annotations, but not sure if that exists?

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