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• How to uninstall java6

  - by infaustus

  I am trying root@vz10931:/var/www/mailer# apt-get remove --purge sun-java6-bin Reading package lists... Done Building dependency tree Reading state information... Done You might want to run apt-get -f install to correct these: The following packages have unmet dependencies: sun-java6-jdk: Depends: sun-java6-bin (>= 6.24-1build0.8.04.1) but it is not going to be installed sun-java6-jre: Depends: java-common (>= 0.24) but it is not installable Depends: sun-java6-bin (>= 6.24-1build0.8.04.1) but it is not going to be installed or ia32-sun-java6-bin (>= 6.24-1build0.8.04.1) but it is not installable vim: Depends: vim-common (= 1:7.1-138+1ubuntu3.1) but 2:7.3.154+hg~74503f6ee649-2ubuntu3 is to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). Below are my sources.list deb http://pl.archive.ubuntu.com/ubuntu/ hardy main restricted universe multiverse deb-src http://pl.archive.ubuntu.com/ubuntu/ hardy main restricted universe multiverse deb http://pl.archive.ubuntu.com/ubuntu/ hardy-updates main restricted universe multiverse deb-src http://pl.archive.ubuntu.com/ubuntu/ hardy-updates main restricted universe multiverse deb http://security.ubuntu.com/ubuntu hardy-security main restricted universe multiverse deb-src http://security.ubuntu.com/ubuntu hardy-security main restricted universe multiverse Ubuntu version - Hardy Heron Anyone know how to remove java ?

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• Why does void in C mean not void?

  - by Naftuli Tzvi Kay

  In strongly-typed languages like Java and C#, void (or Void) as a return type for a method seem to mean: This method doesn't return anything. Nothing. No return. You will not receive anything from this method. What's really strange is that in C, void as a return type or even as a method parameter type means: It could really be anything. You'd have to read the source code to find out. Good luck. If it's a pointer, you should really know what you're doing. Consider the following examples in C: void describe(void *thing) { Object *obj = thing; printf("%s.\n", obj->description); } void *move(void *location, Direction direction) { void *next = NULL; // logic! return next; } Obviously, the second method returns a pointer, which by definition could be anything. Since C is older than Java and C#, why did these languages adopt void as meaning "nothing" while C used it as "nothing or anything (when a pointer)"?

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• Is it wise to ask about design decisions made on a product during an interview?

  - by Desolate Planet

  I've been thinking about interview questions lately and I've been reflecting on bad interview experiences I've had in the past. One of particular note is where I had asked the interviewer why the team chose to use Spring over EJB3 in their product. The interviewer pretty much tore my face off, yelling "Because Spring is not the be all and end all of Java software development, do you want this job or not?". In response to this, I told him that this probably wasn't the job for me and I walked out the interview. He told me at the start of the interview that they had high stuff turnover, the product had gone from Modula 3 to Perl to Java then after asking him a technical question, he went in flames. It seemed obvious to me that he was toxic to the company with that kind of attitude. Question: Is it a good idea to probe on architectural choices taken in an interview? If not, why? From my own point of view, an interview is a two-way process. If the interviewers are testing me on my technical skills, I've got every right to ask them the same questions to 1) Figure out what their mindset and attitudes towards developing software solutions are and 2) To figure out if there are in line with how I would approach problems of that kind. It's very possible that the interviewer who got angry was a bad interviewer and forgot that an interview is a two-way process. If I was asked this, I would have simply said something along the lines of wanting to leverage the container more, but I certainly wouldn't have tried to put him in a state of meek capitulation. The interviewer in question was the lead developer in the team.

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• Is it bad idea to use flag variable to search MAX element in array?

  - by Boris Treukhov

  Over my programming career I formed a habit to introduce a flag variable that indicates that the first comparison has occured, just like Msft does in its linq Max() extension method implementation public static int Max(this IEnumerable<int> source) { if (source == null) { throw Error.ArgumentNull("source"); } int num = 0; bool flag = false; foreach (int num2 in source) { if (flag) { if (num2 > num) { num = num2; } } else { num = num2; flag = true; } } if (!flag) { throw Error.NoElements(); } return num; } However I have met some heretics lately, who implement this by just starting with the first element and assigning it to result, and oh no - it turned out that STL and Java authors have preferred the latter method. Java: public static <T extends Object & Comparable<? super T>> T max(Collection<? extends T> coll) { Iterator<? extends T> i = coll.iterator(); T candidate = i.next(); while (i.hasNext()) { T next = i.next(); if (next.compareTo(candidate) > 0) candidate = next; } return candidate; } STL: template<class _FwdIt> inline _FwdIt _Max_element(_FwdIt _First, _FwdIt _Last) { // find largest element, using operator< _FwdIt _Found = _First; if (_First != _Last) for (; ++_First != _Last; ) if (_DEBUG_LT(*_Found, *_First)) _Found = _First; return (_Found); } Are there any preferences between one method or another? Are there any historical reasons for this? Is one method more dangerous than another?

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• Oracle ADF Framework for 4GL Developers Workshop (15-17/Jun/10)

  - by Claudia Costa

  This 3 day workshop is targeted at Oracle Forms professionals interested in developing JEE applications based on Oracle ADF (Application Development Framework). The workshop highlights the similarities between the 2 development paradigms, while also discussing the crucial differences and components such as the ADF BC and ADF Faces. The goal is to lower the learning curve and enable the attendees to leverage ADF technology immediately, either in developing new applications or re-writing existing Forms applications.   During the event the attendees will rewrite a sample Oracle Forms application using the above technology.   Prerequisites ·         Basic knowledge Oracle database ·         Basic knowledge of the Java Programming Language ·         Basic knowledge of Oracle Jdeveloper or another Java IDE   Hardware/Software Requirements This workshop requires attendees to provide their own laptops for this class. Attendee laptops must meet the following minimum hardware/software requirements: ·         Laptop/PC (3 GB RAM recommended) ·         Oracle Database 10g ·         Internet Explorer 7 ·         The version of Oracle JDeveloper 11g will be provided   To view the full agenda and register please click here   ------------------------------------------------------------------------ Clique aqui e registe-se.   Horário e Local: 9h30 - 18h00 Oracle Lagoas Park - Edf. 8, Porto Salvo   Para mais informações, por favor contacte: [email protected] ------------------------------------------------------------------------

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• Level Creating Help

  - by Brandon oubiub

  I am making a little 2d overhead RPG type game just for fun. I have almost all the basic stuff set up, but I just need a little help on level creation. I can already make a level and place each tile how I want it, but having to place each tile gets annoying after a while. I noticed that in a lot of games, even extremely simple ones, they have LOTS of levels with LOTS of tiles in each. Creating all that in this fashion would take forever. So I guess my question is, as a game developer, am I supposed to do all that, or maybe make a little level editor so I can see things as I create it? What do game developers do? I'm using Java. EDIT: Okay, say if I had an image for a map, that I made in MS paint or photoshop, and each pixel represent a tile value, could I somehow in Java detect what color an individual pixel is? If so, that would be perfect. If so, how?

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• Is there an appropriate coding style for implementing an algorithm during an interview?

  - by GlenPeterson

  I failed an interview question in C years ago about converting hex to decimal by not exploiting the ASCII table if (inputDigitByte > 9) hex = inputDigitByte - 'a'. The rise of Unicode has made this question pretty silly, but the point was that the interviewer valued raw execution speed above readability and error handling. They tell you to review algorithms textbooks to prepare for these interviews, yet these same textbooks tend to favor the implementation with the fewest lines of code, even if it has to rely on magic numbers (like "infinity") and a slower, more memory-intensive implementation (like a linked list instead of an array) to do that. I don't know what is right. Coding an algorithm within the space of an interview has at least 3 constraints: time to code, elegance/readability, and efficiency of execution. What trade-offs are appropriate for interview code? How much do you follow the textbook definition of an algorithm? Is it better to eliminate recursion, unroll loops, and use arrays for efficiency? Or is it better to use recursion and special values like "infinity" or Integer.MAX_VALUE to reduce the number of lines of code needed to write the algorithm? Interface: Make a very self-contained, bullet-proof interface, or sloppy and fast? On the one extreme, the array to be sorted might be a public static variable. On the other extreme, it might need to be passed to each method, allowing methods to be called individually from different threads for different purposes. Is it appropriate to use a linked-list data structure for items that are traversed in one direction vs. using arrays and doubling the size when the array is full? Implementing a singly-linked list during the interview is often much faster to code and easier remember for recursive algorithms like MergeSort. Thread safety - just document that it's unsafe, or say so verbally? How much should the interviewee be looking for opportunities for parallel processing? Is bit shifting appropriate? x / 2 or x >> 1 Polymorphism, type safety, and generics? Comments? Variable and method names: qs(a, p, q, r) vs: quickSort(theArray, minIdx, partIdx, maxIdx) How much should you use existing APIs? Obviously you can't use a java.util.HashMap to implement a hash-table, but what about using a java.util.List to accumulate your sorted results? Are there any guiding principals that would answer these and other questions, or is the guiding principal to ask the interviewer? Or maybe this should be the basis of a discussion while writing the code? If an interviewer can't or won't answer one of these questions, are there any tips for coaxing the information out of them?

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• Feasability of mobile 2D multiplayer RPG game with interactive bitmap background

  - by user2827214

  I'm looking to develop a 2D multiplayer RPG game for Android, with a bird's eye view similar to that of zelda/pokemon. The game is very simple in all ways since my intent is for thousands of players to occupy the same world which I imagine requires good performance. However, I am unsure about the performance requirements of two properties: the tile map that is used as a background is dynamic (interactive). For example, a player steps in the water, and the water turns black. Every tile in the game does this. the tile map is the same object used for all players, but it is displayed differently on each user's mobile device, even though the players exist in the same world. For example, the water that turned black is displayed as red on all other players' screens. I have knowledge of java, but almost none regarding game dev. tools. Is there a best process for these requirements? Should I develop in pure java, or use some tool like Slick2D etc.? How performance intensive are these properties, if even possible? Edit: There are no collisions in the game or difficult animations, I am imagining simply changing the colors of the tiles (like in the examples), and a client-server architecture

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• Better way to generate enemies of different sub-classes

  - by KDiTraglia

  So lets pretend I have an enemy class that has some generic implementation and inheriting from it I have all the specific enemies of my game. There are points in my code that I need to check whether an enemy is a specific type, but in Java I have found no easier way than this monstrosity... //Must be a better way to do this if ( enemy.class.isAssignableFrom(Ninja.class) ) { ... } My partner on the project saw these and changed them to use an enum system instead public class Ninja extends Enemy { //EnemyType is an enum containing all our enemy types public EnemyType = EnemyTypes.NINJA; } if (enemy.EnemyType = EnemyTypes.NINJA) { ... } I also have found no way to generate enemies on varying probabilities besides this for (EnemyTypes types : enemyTypes) { if ( (randomNext = (randomNext - types.getFrequency())) < 0 ) { enemy = createEnemy(types.getEnemyType()); break; } } private static Enemy createEnemy(EnemyType type) { switch (type) { case NINJA: return new Ninja(new Vector2D(rand.nextInt(getScreenWidth()), 0), determineSpeed()); case GORILLA: return new Gorilla(new Vector2D(rand.nextInt(getScreenWidth()), 0), determineSpeed()); case TREX: return new TRex(new Vector2D(rand.nextInt(getScreenWidth()), 0), determineSpeed()); //etc } return null } I know java is a little weak at dynamic object creation, but is there a better way to implement this in a way such like this for (EnemyTypes types : enemyTypes) { if ( (randomNext = (randomNext - types.getFrequency())) < 0 ) { //Change enemyTypes to hold the classes of the enemies I can spawn enemy = types.getEnemyType().class.newInstance() break; } } Is the above possible? How would I declare enemyTypes to hold the classes if so? Everything I have tried so far as generated compile errors and general frustration, but I figured I might ask here before I completely give up to the huge mass that is the createEveryEnemy() method. All the enemies do inherit from the Enemy class (which is what the enemy variable is declared as). Also is there a better way to check which type a particular enemy that is shorter than enemy.class.isAssignableFrom(Ninja.class)? I'd like to ditch the enums entirely if possible, since they seem repetitive when the class name itself holds that information.

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• Which web framework or technologies would suit me?

  - by Suraj Chandran

  Hi, I had been working on desktop apps and server side(non web) for some time and now I am diving in to web first time. I plan to write a scalable enterprise level app. I have worked with Java, Javascript, Jquery etc. but I absolutely hate jsp. So is there any framework that focuses on developing enterprise level web apps without jsp. I liked Wicket's approach, but I think there is a little lack of support of dynamic html in it and jquery(yes i looked at wiquery). Also I feel making wicket apps scalable would take some sweat. Can Spring MVC, Struts2 etc. help me make with this with just using say Java, JavaScript, and JQuery. Or are there any other options for me like Wicket. Please do forgive if anything above looks insane, I am still working on my understanding with enterprise web apps. NOTE: If you think that I should take a different direction or approach, please do suggest!

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• Difficulty / Process for mobile 2D multiplayer RPG game

  - by user2827214

  I'm looking to develop a 2D multiplayer RPG game for Android, with a bird's eye view similar to that of zelda/pokemon. The game is very simple in all ways since my intent is for thousands of players to occupy the same world which I imagine requires good performance. However, I am unsure about the performance requirements of two properties: the tile map that is used as a background is dynamic (interactive). For example, a player steps in the water, and the water turns black. Every tile in the game does this. the tile map is the same object used for all players, but it is displayed differently on each user's mobile device, even though the players exist in the same world. For example, the water that turned black is displayed as red on all other players' screens. I have knowledge of java, but almost none regarding game dev. tools. Is there a best process for these requirements? Should I develop in pure java, or use some tool like Slick2D etc.? How performance intensive are these properties, if even possible? Edit: There are no collisions in the game or difficult animations, I imagining simply changing colors of the tiles like in the examples, and a client-server architecture

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• Unable to record sound from web browser (firefox / chromium ) using recordmydesktop

  - by thamurath

  I have to do some screencast tutorials and i am using recordmydesktop with gtk frontend to do it. I need to record also the sound and here is where i have found the problem. It took me some time, but now I can record the sound from almost every application in my desktop ... almost. I need to capture some sound from a web application using java, but when i load the page nothing appears in the playback tab of pavucontrol. I think this is the problem, because if there is no sound stream i think the recordmydesktop program thinks there is no sound to record ... the funny thing is that I can ear the sound in my speakers! I have tried with Firefox and Chromium with no success. Although I have been able to record youtube videos without problem, so it seems that java is the key here. Any suggestion or idea? P.S.: I am using Ubuntu 11.10 with this configuration. ( if more information is needed please let me know) sight i cannot post images ... so I have an audigy2 sound card using Analog Stereo Output profile. I have also an "Internal Audio" device, but i have it with the "Off" profile. In recordmydesktop-Advanced-Sound: Device = default

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• Which skills would you expect and appreciate in a Junior Software Engineer??

  - by Bartzilla

  Hi StackOverflow community! I would like to receive some advices from all of you. I know in here there are superb programmers, with outstanding careers, people working for amazing and important companies in the industry so I am very excited to read the replies I could get. I recently finished my Msc.in Software Engineering, and I am about to start my professional career in two weeks. My role will be as a Junior Developer for a company which develops e-commerce software using Java & related technologies (among them Spring, Hibernate). To be honest I am really excited about what is coming specially because I really want to develop my career as a Java developer plus I am also very interested in gaining experience in the e-commerce field. Additionally, this is going to be my first work experience as a professional developer so I really want to do my best from the very beginning. I know many of you probably have manager roles or are team leaders, so basically I would like to know which skills and abilities would you judge and appreciate in a new professional (Junior Developer) that could be part of your team(Soft and Technical Skills) and in which skills I should focus on to achieve a successful career as a Software Engineer. Of course there are many things everybody should expect like good technical knowledge of the technologies you are going to use and so on.. But, I would like to hear your opinions, I will really appreciate advises from experienced developers and hear different perspectives other than mines.. Thanks in advance!

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• Supporting and testing multiple versions of a software library in a Maven project

  - by Duncan Jones

  My company has several versions of its software in use by our customers at any one time. My job is to write bespoke Java software for the customers based on the version of software they happen to be running. I've created a Java library that performs many of the tasks I regularly require in a normal project. This is a Maven project that I deploy to our local Artifactory and pull down into other Maven projects when required. I can't decide the best way to support the range of software versions used by our customers. Typically, we have about three versions in use at any one time. They are normally backwards compatible with one another, but that cannot be guaranteed. I have considered the following options for managing this issue: Separate editions for each library version I make a separate release of my library for each version of my company software. Using some Maven cunningness I could automatically produce a tested version linked to each of the then-current company software versions. This is feasible, but not without its technical challenges. The advantage is that this would be fairly automatic and my unit tests have definitely executed against the correct software version. However, I would have to keep updating the versions supported and may end up maintaining a large collection of libraries. One supported version, but others tested I support the oldest software version and make a release against that. I then perform tests with the newer software versions to ensure it still works. I could try and make this testing automatic by having some non-deployed Maven projects that import the software library, the associated test JAR and override the company software version used. If those projects build, then the library is compatible. I could ensure these meta-projects are included in our CI server builds. I welcome comments on which approach is better or a suggestion for a different approach entirely. I'm leaning towards the second option.

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• how to avoid flickering in awt [on hold]

  - by Ishanth

  import java.awt.event.*; import java.awt.*; class circle1 extends Frame implements KeyListener { public int a=300; public int b=70; public int pacx=360; public int pacy=270; public circle1() { setTitle("circle"); addKeyListener(this); repaint(); } public void paint(Graphics g) { g.fillArc (a, b, 60, 60,pacx,pacy); } public void keyPressed(KeyEvent e) { int key=e.getKeyCode(); System.out.println(key); if(key==38) { b=b-5; //move pacman up pacx=135;pacy=270; //packman mouth upside if(b==75&&a>=20||b==75&&a<=945) { b=b+5; } else { repaint(); } } else if(key==40) { b=b+5; //move pacman downside pacx=315; pacy=270; //packman mouth down if(b==645&&a>=20||b==645&&a<=940) { b=b-5; } else{ repaint(); } } else if(key==37) { a=a-5; //move pacman leftside pacx=227; pacy=270; //packman mouth left if(a==15&&b>=75||a==15&&b<=640) { a=a+5; } else { repaint(); } } else if(key==39) { a=a+5; //move pacman rightside pacx=42;pacy=270; //packman mouth right if(a==945&&a>=80||a==945&&b<=640) { a=a-5; } else { repaint(); } } } public void keyReleased(KeyEvent e){} public void keyTyped(KeyEvent e){} public static void main(String args[]) { circle1 c=new circle1(); c.setVisible(true); c.setSize(400,400); } }

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• How to minimize the usage of static variables and objects

  - by Peter Penzov

  I'm trying to implement this JavaFX code where I want to call remote Java class and pass boolean flag: final CheckMenuItem toolbarSubMenuNavigation = new CheckMenuItem("Navigation"); toolbarSubMenuNavigation.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent e) { //DataTabs.renderTab = toolbarSubMenuNavigation.isSelected(); DataTabs.setRenderTab(toolbarSubMenuNavigation.isSelected()); // call here the getter setter and send boolean flag System.out.println("subsystem1 #1 Enabled!"); } }); Java class which I want to call: public class DataTabs { private static boolean renderTab; // make members *private* private static TabPane tabPane; public static boolean isRenderTab() { return DataTabs.renderTab; } public static void setRenderTab(boolean renderTab) { DataTabs.renderTab = renderTab; tabPane.setVisible(renderTab); } // somewhere below // set visible the tab pane TabPane tabPane = DataTabs.tabPane = new TabPane(); tabPane.setVisible(renderTab); } This implementation works but I want to optimize it to use less static variables and objects. Can you tell me which sections of the code how can be optimized?

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• Almost working 2D Collisions

  - by TheGag96

  I'm terribly sorry I'm asking this question YET AGAIN, but I can almost guarantee that this will be the last time I'll have to ask. I'm currently on the verge of FINALLY getting these collisions to work for my game, made with libGDX in Java. My collisions use the same method as (and are basically copied and modified code from) the XNA Platformer example (here) where the direction of the collision is based on the rectangle where two objects are overlapping. The collisions themselves almost work perfectly, but for some reason, holding down/up and left and colliding with the floor/ceiling while doing so doesn't seem to work well. I'm not at all sure why. Instead of vaguely giving my problem and snippets of code, I've decided to instead provide a binary and the source of the game I have so far so you can see for yourself what my problem is. Link. (Note: make sure you unzip everything into a folder somewhere or it will not work) You'll find the collision code in the method workingCollisions() in Link.java. Please excuse the messy code and terrible graphics as this whole thing is in pre-pre-alpha. If anyone is kind enough and helps me out here, you are the best person ever. I'm completely desperate; I've been trying this on and off for months and I just can't get it to work. I cannot thank you enough.

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• Reflective discovery of an inner class in an API

  - by wassup

  Let me ask you, as this bothers me for quite a while but appears to be subjectively the best solution for my problem, if reflective discovery of an inner class for API purposes is that bad idea? First, let me explain what I mean by saying "reflective discovery" and all that stuff. I am sketching an API for a Java database system, that'll be centered around block-based entities (don't ask me what that means - that's a long story), and those entities can be read and returned to the Java code as objects subclassed from the Entity class. I have an Entity.Factory class, that, by means of fluent interfaces, takes a Class<? extends Entity> argument and then, uses an instance of Section.Builder, Property.Builder, or whatever builder the entity has, to put it into the back-end storage. The idea about registering all entity types and their builders just doesn't appeal to me, so I thought that the closest solution to the problem that'd suffice my design needs would be to discover, using reflection, all inner classes of Entity classes and find one that's called Builder. Looking for some expert insight :) And if I missed some important design details (which could happen as I tried to make this question as concise as possible), just tell me and I'll add them.

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• Server-side Architecture for Online Game

  - by Draiken

  basically I have a game client that has communicate with a server for almost every action it takes, the game is in Java (using LWJGL) and right now I will start making the server. The base of the game is normally one client communicating with the server alone, but I will require later on for several clients to work together for some functionalities. I've already read how authentication server should be sepparated and I intend on doing it. The problem is I am completely inexperienced in this kind of server-side programming, all I've ever programmed were JSF web applications. I imagine I'll do socket connections for pretty much every game communication since HTML is very slow, but I still don't really know where to start on my server. I would appreciate reading material or guidelines on where to start, what architecture should the game server have and maybe some suggestions on frameworks that could help me getting the client-server communication. I've looked into JNAG but I have no experience with this kind of thing, so I can't really tell if it is a solid and good messaging layer. Any help is appreciated... Thanks ! EDIT: Just a little more information about the game. It is intended to be a very complex game with several functionalities, making some functionalities a "program" inside the program. It is not an usual game, like FPS or RPG but I intend on having a lot of users using these many different "programs" inside the game. If I wasn't clear enough, I'd really appreciate people that have already developed games with java client/server architecture, how they communicated, any frameworks, apis, messaging systems, etc. It is not a question of lack of knowledge of language, more a question for advice, so I don't end up creating something that works, but in the later stages will have to be rewriten for any kind of limiting reason. PS: sorry if my english is not perfect...

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• How to Install WebLogic 12c ZIP on Linux

  - by Bruno.Borges

  I knew that WebLogic had this small ZIP distribution, of only 184M, but what I didn't know was that it is so easy to install it on Linux machines, specially for development purposes, that I thought I had to blog about it. You may want to check this blog, where I found the missing part on this how to, but I'm blogging this again because I wanted to put it in a simpler way, straight to the point. And if you are looking for a how to for Mac, check Arun Gupta's post.  So, here's the step-by-step: 1 - Download the ZIP distribution (don't worry if your system is x86_64)Don't forget to accept the OTN Free Developer License Agreement! 2 - Choose where to install your WebLogic server and your domain, and set as your MW_HOME environment variableI will use /opt/middleware/weblogic for this how to export MW_HOME=/opt/middleware/weblogicMake sure this path exists in your system. 'mydomains' will be used to keep your WebLogic domain. mkdir -p $MW_HOME/mydomain 3 - If you don't have your JAVA_HOME environment variable still configured, do it. Point it to where your JDK is installed. export JAVA_HOME=/usr/lib/jvm/default-java 4 - Unzip the downloaded file into MW_HOME unzip wls1211_dev.zip -d $MW_HOME 5 - Go to that directory and run configure.sh cd $MW_HOME ./configure.sh 6 - Call the setEnvs.sh script . $MW_HOME/wlserver/server/bin/setWLSEnv.sh7 - Create your development domain. It will ask you for username and password. I like to use weblogic / welcome1cd $MW_HOME/mydomain $JAVA_HOME/bin/java $JAVA_OPTIONS -Xmx1024m \ -Dweblogic.management.allowPasswordEcho=true weblogic.Server8 - Start WebLogic and access its web console(sh startWebLogic.sh &); sleep 10; firefox http://localhost:7001/consoleUsually, it takes only 10 seconds to start a domain, and 5 more to deploy the Administration Console (on my laptop). :-)Enjoy!

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• How do I start working as a programmer - what do I need?

  - by giorgo

  Hello, i am currently learning Java and PHP as I have some projects from university, which require me to apply both languages. Specifically, a Java GUI application, connecting to a MySQL database and a web application that will be implemented in PHP/MySQL. I have started learning the MVC pattern, Struts, Spring and I am also learning PHP with zend. My first question is: How can I find employment as a programmer/software engineer? The reason I ask is because I have sent my CV into many companys, but all of them stated that I required work experience. I really need some guidance on how to improve my career opportunites. At present, I work on my own and haven't worked in collaboration with anyone on a particular project. I'm assuming most people create projects and submit them along with their CVs. My second question is: Everyone has to make a start from somewhere, but what if this somewhere doesn't come? What do I need to do to create the circumstances where I can easily progress forward? Thanks

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• I still can't figure out how to program!

  - by Mark K.

  Please help! I've read lots of programming books for various languages, Java, Python, C, etc. I understand and know all of the basics of the languages and I understand algorithms and data structures. (Equivilant of say 2 years of CompSci classes) BUT, I still can't figure how to write a program that does anything useful. All of the programming books show you how to write the language, but NOT how to use it! The programming examples are all very basic like build a card catalog for a library or a simple game or use algorithms etc... They dont't show you how to develop complex programs that actually do anything useful! I've looked a open-source programs on sourceforge, but they don't make much sense to me. There are hundreds of files in each program & thousands of lines of code. But how do I learn how to do this? There's nothing in any book I can buy on Amazon that will give me the tools to write any of these programs. How do you go from reading Intro to Java or Programming Python, or C Programming Language, etc.. to actually being able to say, I have an idea for X Program.. this is how I go about developing it? It seems like there is so much more involved in writing a program than you can learn in a book or from a class. I feel like there is someth Can anyone put me on the right track?

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• Do the benefits of Resin/Quercus outweigh the overhead?

  - by Craige

  Lately, I've been looking more and more into Resin + Quercus as a technology to develop an application of mine. The reason I started looking into it was that this application has high reporting needs, a lot of which cannot (or realistically, should not) be created in real-time. Java would offer a nice backend to queue and generate reports. Also, with Quercus I would be able to develop my data models in Hibernate, and use them "from PHP", thus effectively stretching these models across front and back-end. This same concept would also apply to any front/back-end common business logic, which could be developed in Java libraries. Now, the downside is that whichever front-end (PHP) MVC Framework I choose (my goal was Symfony 2), it is unlikely to work without some heavy modification, if it can work at all. Quercus is a pretty close implementation of PHP, and is supposed to be compatible with PHP5.3, so namespaces and closures SHOULDN'T be a problem, but when I tried to run an existing Symfony 1.4 app, I failed miserably. So, my question to you is, do you think the benefits of Resin + Quercus outweigh the overhead of using a not-so-perfect/stable implementation of PHP? If this were your application, and your goal was and end-product, rather than educational purposes, what would you decide?

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• How to name a static factory method in the utility class?

  - by leventov

  I have an interface MyLongNameInterface with a counterpart utility class MyLongNameInterfaces. What is the best name for a static factory method in the utility class, which creates an instance of MyLongNameInterface? MyLongNameInterfaces.newInstance() -- a new instance of the utility class? MyLongNameInterfaces.newMyLongNameInterface() -- too verbose MyLongNameInterfaces.create() -- create an instance of the utility class? Also, create is not a widely used conventional verb in Java better option?

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• Algorithm for procedural city generation?

  - by Zove Games

  I am planning on making a (simple) procedural city generator using Java. I need ideas on whan algorithm to use for the layout, and the actual buildings. The city will mostly have skyscrapers, not really much complex stuff. For the layout I already have a simple algorithm implemented: Create a Map with java.awt.Point keys and Integer values. Fill it with all the points in the city's bounds with the value as -1 (unnassigned) Shuffle the map, and assign the 1st 10 of the keys IDs (from 1-10) Loop until all points have IDs: Loop though all points: Assign points next to an assigned point IDs of the point next to them, if 2 or more points border the point, then randomly choose which ID the point will get. You will end up with 10 random regions. Make roads bordering these regions. Fill the inside of each region with a randomly spaced and randomly rotated grid PROBLEM: This is not the fastest way to do it. What algorithm should I use for the layout. And what should I use to make each building's design? I don't even know how I'm going to do that yet (fractals maybe). I just need some ideas, not actual code.

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