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• Eclipse is not importing jar dependencies between two projects in the same workspace

  - by jax

  Here is the situation. I have a java project "LicenseGenerator" in eclipse that depends on commons-codec. I have therefore added the commons-codec jar file to the build path. I have Junit tests and everything is working fine. I have made a different project in the same workspace - which happens to be an Android project - that needs to use my LicenseGenerator classes. I added LicenseGenerator to the "projects" tab in the build path - the classes were recognized and I was able to use them. Everything compiled and ran. However, when the part of the LicenseGenerator that used the commons-codec was called from my Android project I got the following error. Could not find method org.apache.commons.codec.binary.Base64.encodeBase64URLSafeString, referenced from method This basically tells me that the commons-codec was not packaged which the Android project, so I added the commons-codec to the android project as well but the same error appears. how do I fix this?

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• Eclipse is not importing jar dependencies between two projects in the same workspace

  - by jax

  Here is the situation. I have a java project "LicenseGenerator" in eclipse that depends on commons-codec. I have therefore added the commons-codec jar file to the build path. I have Junit tests and everything is working fine. I have made a different project in the same workspace - which happens to be an Android project - that needs to use my LicenseGenerator classes. I added LicenseGenerator to the "projects" tab in the build path - the classes were recognized and I was able to use them. Everything compiled and ran. However, when the part of the LicenseGenerator that used the commons-codec was called from my Android project I got the following error. Could not find method org.apache.commons.codec.binary.Base64.encodeBase64URLSafeString, referenced from method This basically tells me that the commons-codec was not packaged which the Android project, so I added the commons-codec to the android project as well but the same error appears. how do I fix this?

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• Rendering Dragged object during drag

  - by marco

  Hello, I have been stuck on this problem for a while now. I want to drag a row in a jtable to reorder it. But I really want the user to see the row while dragging it and not just the default "drag" rectangle symbol. So I took a look at the java DnD tutorial finding it very useful, but.. The problem is that I still dont know which method I should override to get this going. Can somebody help me out?

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• is there some lightweight tecnique for adding type safety to identifier properties?

  - by shoren

  After using C++ I got used to the concept of Identifier which can be used with a class for the type, provides type safety and has no runtime overhead (the actual size is the size of the primitive). I want to do something like that, so I will not make mistakes like: personDao.find(book.getId());//I want compilation to fail personDao.find(book.getOwnerId());//I want compilation to succeed Possible solutuions that I don't like: For every entity have an entity id class wrapping the id primitive. I don't like the code bloat. Create a generic Identifier class. Code like this will not compile: void foo(Identifier book); void foo(Identifier person); Does anyone know of a better way? Is there a library with a utility such as this? Is implementing this an overkill? And the best of all, can this be done in Java without the object overhead like in C++?

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• Converting audio files(.3gp) to video with Album cover and uploading to YouTube

  - by Samuh

  I have an audio file in .3gp format on my Android device which I wish to upload to YouTube. I know that YouTube is a video upload site and that I need to convert this sound file to video. I just want an image to display all the time the audio is playing. Google tells me there are number of tools that can help me. But I want to do this via java code from my Android device. Please help. Thanks.

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• How to set the component size with GridLayout? Is there a better way?

  - by Blackbam

  Hello guys, I am working on a larger GUI with Java and I am becoming angry on Layout Managers. I have a "Settings-Panel" with a variable number of JComponents in it (Labels, Buttons, JSpinners, JSliders,...). I just want the following: JLabel <- JComponent JLabel <- JComponent JLabel <- JComponent ... My Panel has a size of 500px, so that there is enough space for a lot of components. Unfortunatly the GridLayout always stretches the size of the Components to the whole Panel, even if I set a MaximumSize for every component. It looks stupid if there are only two buttons each with a height of 250px. I tried flow Layout, but i cannot figure out a way to make new lines properly. I tried BoxLayout.Y_AXIS, but the Components are always centered, and Label and Component are not in the same line. Does anybody know a good and short way with LayoutManagers to handle this properly?

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• Search in big text log files

  - by 0xFF

  Hi, let's say you have an game server which creating text log files of gamers actions, and from time to time you need to lookup something in those logs files (like investigating an scam or loosing an item). Just for example you have 100 files and each file have size between 20MB and 50MB - How you would search them quickly? What I have already tried to do is create several threads and each invidual thread will map his own file to memory (let say memory should not be problem if it not exceed 500MB of ram) perform search here, result was something around 1 second per file : File:a26.log - read in: 0.891, lines: 625282, matches: 78848 Is there better way how to do that ? - because it seems to me kinda slow. thanks. (java was used for this case)

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• Getting object coordinates from camera

  - by user566757

  I've implemented a camera in Java using a position vector and three direction vectors so I can use gluLookAt(); moving around in `ghost mode' works fine enough, but I want to add collision detection. I can't seem to figure out how to transform my position vector to coordinates in which OpenGL draws my objects. A rough sketch of my drawing loop is this: glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); camera.setView(); drawer.drawTheScene(); I'm at a loss of how to proceed; looking at the ModelView matrix between calls and my position vector, I haven't found any kind of correlation.

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• Is it possible to create a jdbc connection without a password (using postgresql 'trust')?

  - by mojones

  I am using jdbc to connect to a postgresql database in a java application (actually the app is written in Groovy). I have postgresql set up to use the 'trust' authentication method. Is it possible to open a jdbc connection without specifying a password? When I try to use the normal constructor with a blank password, it fails with Exception in thread "Thread-2" org.postgresql.util.PSQLException: FATAL: password authentication failed for user "myuser" Even though, from the command line, this works fine psql -U myuser mydatabase Welcome to psql 8.3.5, the PostgreSQL interactive terminal. Type: \copyright for distribution terms \h for help with SQL commands \? for help with psql commands \g or terminate with semicolon to execute query \q to quit

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• getting started with qpid server

  - by London

  I'd like to get started with qpid, can anyone recommend some useful resources/links/code examples for me to study? I'm interested about java implementations?I'd like to create message sender/listener. I've already done messaging with jboss where I send the message to the queue and the listener picks it up from there, what is different with qpid? Is it the same only replacing jboss as a server with qpid or?I'm new to all of this it might sound weird when I ask it. Oh yes similar question: http://stackoverflow.com/questions/1693099/get-started-with-qpid Doesn't really help me much. Any hints would help me a lot. thank you

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• Creation obex connection without service discovery

  - by Vio

  Hello there my problem is this,i want to create an obex connection but i already know my server adress.The problem is how to get the connection url without service discovery.I use a normal java project for my server side and a midlet project for my client side.I will post the code maybe it helps. Server connection UUID uuid=new UUID("8841",true); String url="btgoep://localhost:"+uuid+";name=FTP;authenticate=false;master=false;encrypt=false"; SessionNotifier sn=(SessionNotifier)Connector.open(url); System.out.println("Now waiting for a client to connect"); sn.acceptAndOpen(this); System.out.println("A client is now connected"); When i try to connect with the client it doesn't get to the last line :(....any ideas why?Hope u can help...thanks

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• Loading jQuery with Tapestry 5

  - by American Yak

  Okay, so I'm not a Java guy, but I work with loads of them. We generally load Prototype with Tapestry 5, as Tapestry was built on this javascript library. As a UI/front end developer/engineer, I know the awesomeness of jQuery and the lack of prototype therein. (Feel free to debate that elsewhere -- this ticket doesn't concern that question, ha.) I've been curious for some time if it's possible to port jQuery into Tapestry instead of Prototype -- as in completely removing Prototype and Scriptaculous -- I realize it kind of defeats the purpose of the already bundled Prototype, but I wanted other opinions on the matter. Thanks.

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• Can I write to different jetty databases using JPA that is using the same "entity class"

  - by Per

  I am using Java persistance and there EntityManager class and have it assigned to storage a class object that shall be written to the database. My problem is that I want to write to different databases using the same storage class. My solution to that was to write a StorageManagerfactory that has a Map holding all EntityManagers. The solution looked good until I looked at the databases and realized that all information (undepending of the Map, which gets the correct value) was written to the same database (one of the initialised in the Map). So my question is: Can I write to different databases using JPA that is using the same storage class (the class holding the structure of my database)? Thanks

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• dbpedia /flash how to?

  - by user348174

  I am interested in visualising data from dbpedia in flash but I am a little out of my depth technically... I know a bit of actionscript, javascript and some php but I'm not familiar with SPARQL or java. The documentation I can find on it is a little over my head. I have a couple of questions before I totally ruling it out: • Has anyone come across an example/tutorial for accessing dbpedia data through flash? • Im a little hazy on how you work with dbpedia. Do you download the entire database or can you connect to a database on their server? Any advice would be appreciated. Thanks

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• Teacher confused about MVC?

  - by Gideon

  I have an assignment to create a game in java using MVC as a pattern. The thing is that stuff I read about MVC aren't really what the teacher is telling me. What I read is that the Model are the information objects, they are manipulated by the controllers. So in a game the controller mutates the placement of the objects and check if there is any collision etc. What my teacher told me is that I should put everything that is universal to the platform in the models and the controllers should only tell the model which input is given. That means the game loop will be in a model class, but also collision checks etc. So what I get from his story is that the View is the screen, the Controller is the unput handeler, and the Model is the rest. Can someone point me in the right direction?

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• Need help on how to setup my packages and projects in eclipse

  - by jax

  I am new to Java and am making a license generator. This is my current setup. com.example.licensegenerator.client (used by the client application) :LicenseLoader (no Main method) :LicenseDownloader (no Main method) com.example.licensegenerator.server.keys (used by the server) :ProductKeyGenerator(Main method) com.example.licensegenerator.server.license (used on the server also) :LicenseGenerator(Main method) com.example.licensegenerator.lib (Shared classes between client and server) :Contants (no main) Now I have a few questions. Is it OK to have multiple Main() methods in a single project? Will I be able to compile them to different .jar files? (In this case I need two different jars for the server) Is there a better way to setup the packages? And a totally unrelated question, with exceptions, is it better to handle them right then and there or throw them and let the main method catch them all (the program cannot recover if an error occurs)

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• Eclipse buildpath automatically taking all JARs of a internal directory

  - by Niko

  How do I configure my project buildpath to have a set of .jar files located in the same directory automatically included in the buildpath ? Meaning that adding a new .jar file to this directory (and refreshing the project) updates the buildpath ? Rem : I am not working in a Webapp but in a standalone Java app. I know that it is possible in a Dynamic Web Project to have all the .jars located in WEB-INF/lib to be included in the build path. Is it possible to do kind of the same include but in standalone app ? I am using Eclipse 3.4

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• Why are mainframes still around?

  - by ThaDon

  It's a question you've probably asked or been asked several times. What's so great about Mainframes? The answer you've probably been given is "they are fast" "normal computers can't process as many 'transactions' per second as they do". Jeese, I mean it's not like Google is running a bunch of Mainframes and look how many transactions/sec they do! The question here really is "why?". When I ask this question to the mainframe devs I know, they can't answer, they simply restate "It's fast". With the advent of Cloud Computing, I can't imagine mainframes being able to compete both cost-wise and mindshare-wise (aren't all the Cobol devs going to retire at some point, or will offshore just pickup the slack?). And yet, I know a few companies that still pump out net-new Cobol/Mainframe apps, even for things we could do easily in say .NET and Java. Anyone have a real good answer as to why "The Mainframe is faster", or can point me to some good articles relating to the topic?

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• How to like a page on fanpage on facebook without a mouse

  - by Matthew Harwood

  BACKGROUND I'm doing an interactive art project for school. PROCESS For this project the last step is to go to a facebook fanpage and like the facebook page. PROBLEM is there will be no mouse for this interaction. SOLUTIONS Is there a script I(or stackoverflow) can write me that I may execute that will like a facebook page? Or is there any other solution that you guys can think of? TOOLS/LANG. BEING USED: ARDURINO/JAVA, HTML, JAVASCRIPT and CSS.

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• What motivates people to learn a new programming language?

  - by szabgab

  There are plenty of question asking Which Programming Language Should I Learn? but I have not found an answer yet to the question what really motivates people to learn a specific new language?. There are the people who think they should learn a new language every year for educational purpose. How do they decide on the languages to be learned? Then I guess there are people who learn a new language because people around them told it is a fun language and they can build nice things with it. Of course if the current job requires it people would learn a new language but I think if the language seems to have a potential to earn money (e.g. There are plenty of jobs in Java or ObjectiveC can be used to write apps for the iPhone and make money). So why are you learning a new language or why have you learned the languages you know?

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• how to get audio frequency data from a wave file?

  - by potlee

  I want to build a speech recognition engine in ruby. I know i'll never get there, doing it just for fun. I need to get data for the frequencies of the sound stored in a wav file to compare with data i already have of different sounds that i want to recognize. I will write the code in ruby but i dont think there are any libraries for this written in ruby, they would be too slow if there were any anyway. The good thing about ruby is I'll be able to use libraries for .net via IronRuby or Java via Jruby. How can i get the frequency data?

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• Adding behaviour to a set of classes

  - by devoured elysium

  I have defined an Event class: Event and all the following classes inherit from Event: SportEventType1 SportEventType2 SportEventType3 SportEventType4 Right now I will only have SportEvents but I don't know if in the future I'll want some other kind of events that doesn't even have anything to do with Sports. Later, I will want to draw some graphics with info taken from Events, and the drawing logic can be a bit complex. But, for the moment, I think I shouldn't think of how the drawing will be done and I believe that maybe it'd be better if that drawing part was not put as an integral part of the Event/SportEventX class chain. I am looking for solutions for this problem. I know I could just make Event have an instance variable(attribute, for the java crowds) pointing to something as an IDrawInterface, but that would make the Event class "assume" it will be later used for drawing. I would like to make the Event class oblivious to this if possible. Thanks!

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• How to test if an array contains a pair of numbers whose product is odd?

  - by John

  How can I write a function that takes an array of integers and returns true if their exists a pair of numbers whose product is odd? What are the properties of odd integers? And of course, how do you write this function in Java? Also, maybe a short explanation of how you went about formulating an algorithm for the actual implementation. Yes, this is a function out of a textbook. No, this is not homework—I'm just trying to learn, so please no "do your own homework comments."

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• Better to extend a class or modify it directly?

  - by primehunter326

  Hi, So I'm working on creating a visualization for a data structure in Java. I already have the implementation of the data structure (Binary Search Tree) to start with, but I need to add some additional functionality to the included node class. As far as conventions and best practices are concerned, should I create a subclass of the node with this added functionality or should I just modify what I have and document it there? My question is similar to what's asked here but that's a little over my head. I know it probably doesn't matter much for what I'm doing, so I'm asking this more as a general thing.

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• Berkeley DB tuple with unknown datatype

  - by Ronnie

  I'm working with a Berkeley database (in Java). I need to read a tuple where the sequence is a string, either an int or long, then another string. How can I determine if the tuple holds an int or a long? Depending on what the tuple holds, I'll do one of the following: String s1 = input.readString(); int num1 = input.readInt(); String s2= input.readString(); or String s1 = input.readString(); long num1 = input.readLong(); String s2= input.readString(); The int is 4 bytes and the long is 8 bytes. If the tuple holds an int and I read it in as a long, I get an invalid value as it converts the 4 byte int + 4 bytes of the following string into a long.

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