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  • Useful Java Annotations

    - by Jon
    I'm interested in finding out exactly which Java annotations people think are most useful during development. This doesn't necessarily have to limited to the core Java API, you may include annotations you found in third party libraries or annotations you've developed yourself (make sure you include a link to the source). I'm really interested in common development tasks rather than knowing why the @ManyToOne(optional=false) in JPA is awesome... Include the annotation and a description of why it's useful for general development.

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  • Export PDF pages to a series of images in Java

    - by dasp
    I need to export the pages of an arbitrary PDF document into a series of individual images in jpeg/png/etc format. I need to do this in in Java. Although I do know about iText, PDFBox and various other java pdf libraries, I am hoping for a pointer to some working example, or some how-to. Thanks.

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  • How to implement " char * ftoa(float num) " without sprintf() library function in C, C++ and JAVA

    - by SIVA
    Today I appeared for an interview, and the question was writing my own "char * ftoa(float num) " in C, C++ and Java. Yes, I know float numbers follow IEEE standard while allocating their memory, but I don't know float to char conversion by using Mantissa and Exponent in C. I don't have any idea to solve the above problem in C++ and JAVA. I/P to the ftoa(): 1.23 O/P from the ftoa(): 1.23 (char format). Thanks in advance ...

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  • java.security.AccessControlException: access denied Exception

    - by Nila
    Hi! I'm trying to do a simple program for RMI. But, I'm getting the following exception while running the line Naming.rebind("interfacename",Remoteserverobject); java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.0.1:1099 connect,resolve) How to overcome this problem. Thanks in advance

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  • Using Tuples in Java

    - by syker
    My Hashtable in Java would benefit from a value having a tuple structure. What data structure can I use in Java to do that? Hastable<Long, Tuple<Set<Long>,Set<Long>>> table = ...

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  • Java mouse motion anywhere on screen

    - by Dave
    I'm sure this is possible but all my searching is coming up blank. In Java is it possible to register for a mouse motion event outside of a Java app? So if the mouse pointer moves anywhere on the screen I get a call back. An approximation is possible with polling MouseInfo.getPointerInfo but there must be a better way. Thanks

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  • set windows PATH environment variable at runtime in Java

    - by hhhh
    I have a java program that fires off an executable using the Runtime.exec() method. I'm using the variant that takes in a set of command line params as one argument, and some environment variables as another argument. The environment variable I'm tryign to set is path, so i'm passing in "PATH=C:\some\path". This does not work. Is there some trick to this or any alternatives. I am stuck to Java 1.4 unfortunately.

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  • Django-like templates system for Java?

    - by Savash
    I'm looking for the templates engine for Java with syntax like in Django templates or Twig (PHP). Is it exists? Update: The target is to have same templates files for different languages. File index.tpl {{head}} {{ var|escape }} {{body}} can be rendered from python (Django) code as well as from PHP, using Twig. I'm looking for Java solution. Thanks.

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  • How to extend the Eclipse Java Editor to add coloured overlays

    - by Gavin Clarke
    I have an idea for an Eclipse plugin which I've been toying with. I need to be able to extend the Eclipse Java Editor component and add coloured overlays to the code based on pluggable external metrics. Unfortunately there doesn't appear to be any kind of syntax highlighting extension point. Does anyone know how I might be able to extend the exisitng eclipse Java Editor to add custom highlighting rules? Bear in mind I'm new to Eclipse plugin programming so please give as much detail as possible.

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  • READING WEBSITE CONTENTS JAVA

    - by Sahil Manchanda
    IM DEVELOPING AN ANDROID APPLICATION WHERE in a website i PROGRAMMATICALLY submit data into search box and retrieve results by JAVA. i get the data by using URLConnect JAVA. i get the source code ie html code...... Urlconnection a = .connect to host getinputstream read data i use these functions now if the site has content like: sahil 3/5 patel chowk 965955 since these details will be inside html tags i want to extract this information . any idea

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  • Including FFMPEG with a Java application on Mac

    - by James Skidmore
    I'm writing a Java program that will be used on both Windows and Mac. In the program, I'm using FFMPEG to convert a MOV file to an FLV. On Windows, it's no problem -- simply call the command. But on Mac, I'm not quite sure what to do. Does the user really have to install FFMPEG on their machine, or can it somehow be included in the Java application? Thanks for any help/guidance!

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  • Java Garbage Collection

    - by pietervn
    I was wondering about the garbage collection that takes place in Java. Is it really able to handle all objects that aren't used and free up the most possible memory? I also want to know how does the Java garbage collection compare to another language like lets say C#? And then, how does the automatic garbage collection measure up against manual collection from a language like C?

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  • java ide applet

    - by kelton52
    I'd like to be able to graphically design java web applets like you can do with standard desktop java programs in netbeans...but I can't seem to be able to do that in netbeans. Any ideas on programs, or maybe I'm not doing it right in netbeans. Thanks.

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  • Java problem cant find image file

    - by user363035
    I am a student working on a homework project. I spent DAYS trying to get the following code to display an image on my new windows 7 laptop. I compiled it and ran it on my old xp pc and it worked! I really want to use my laptop. Any suggestions on how to get it to display the image? import java.awt.*; import java.applet.*; import java.awt.event.*; import java.awt.image.*; public class MoveIt extends Applet implements ActionListener { // set variables and componets private Image cup; Panel keypad = new Panel(); public int top = 15; public int left = 15; private Button keysArray[]; public void init() { cup = getImage(getDocumentBase(), "cup.gif"); Canvas myCanvas = new Canvas(); keysArray = new Button[5]; setLayout(new BorderLayout(5,5)); setBackground(Color.blue); // set up keypad layout keypad.setLayout(new BorderLayout(0,0)); keysArray[0] = new Button("Up"); keysArray[1] = new Button("Left"); keysArray[2] = new Button("Center"); keysArray[3] = new Button("Right"); keysArray[4] = new Button("Down"); // add buttons to the keypad panel keypad.add(keysArray[0], BorderLayout.NORTH); keysArray[0].addActionListener(this); keypad.add(keysArray[1], BorderLayout.EAST); keysArray[1].addActionListener(this); keypad.add(keysArray[2], BorderLayout.CENTER); keysArray[2].addActionListener(this); keypad.add(keysArray[3], BorderLayout.WEST); keysArray[3].addActionListener(this); keypad.add(keysArray[4], BorderLayout.SOUTH); keysArray[4].addActionListener(this); // add canvas and keypad to the BorderLayout add(myCanvas, BorderLayout.NORTH); add(keypad, BorderLayout.SOUTH); } public void paint(Graphics g) { g.drawImage( cup, left, top, this ); } public void actionPerformed(ActionEvent e) { // test for menu item clicks String arg = e.getActionCommand(); if (arg == "Up") top -=15; else if (arg == "Down") top +=15; else if (arg == "Left") left -=15; else if (arg == "Right") left +=15; else { top = 60; left =125; } repaint(); } }

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  • Java code translation of Python array-splitting code

    - by techventure
    Can someone please give the Java equivalent of the below python (which slices a given array into given parts) which was originally written by ChristopheD here: def split_list(alist, wanted_parts=1): length = len(alist) return [ alist[i*length // wanted_parts: (i+1)*length // wanted_parts] for i in range(wanted_parts) ] I don't know any python but can really use the above code in my Java app. Thanks

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  • Hadoop in a RESTful Java Web Application - Conflicting URI templates

    - by user1231583
    I have a small Java Web Application in which I am using Jersey 1.12 and the Hadoop 1.0.0 JAR file (hadoop-core-1.0.0.jar). When I deploy my application to my JBoss 5.0 server, the log file records the following error: SEVERE: Conflicting URI templates. The URI template / for root resource class org.apache.hadoop.hdfs.server.namenode.web.resources.NamenodeWebHdfsMethods and the URI template / transform to the same regular expression (/.*)? To make sure my code is not the problem, I have created a fresh web application that contains nothing but the Jersey and Hadoop JAR files along with a small stub. My web.xml is as follows: <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet> <servlet-name>ServletAdaptor</servlet-name> <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet- class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>ServletAdaptor</servlet-name> <url-pattern>/mytest/*</url-pattern> </servlet-mapping> <session-config> <session-timeout> 30 </session-timeout> </session-config> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app> My simple RESTful stub is as follows: import javax.ws.rs.core.Context; import javax.ws.rs.core.UriInfo; import javax.ws.rs.Path; @Path("/mytest") public class MyRest { @Context private UriInfo context; public MyRest() { } } In my regular application, when I remove the Hadoop JAR files (and the code that is using Hadoop), everything works as I would expect. The deployment is successful and the remaining RESTful services work. I have also tried the Hadoop 1.0.1 JAR files and have had the same problems with the conflicting URL template in the NamenodeWebHdfsMethods class. Any suggestions or tips in solving this problem would be greatly appreciated.

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  • Java graph library for comparing 2 graphs

    - by user311909
    Hello, Does anyone know a good java library for graph comparing by searching maximal common subgraph isomorphism to get information about their similarity? I do not want to compare graphs based on node labels. Or is there any other way how to topologicaly compare graphs with good java library? Now I am using library SimPack and it is usefull but I need something more. Any suggestions will be very helpful. Thanks in advance

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  • How do I connect to MSSQL 2008 database in Java with JDBC

    - by shuxer
    I have MSSQL 2008 installed on my local PC, and my Java application needs to connect to a MSSQL database. I am a new to MSSQL and I would like get some help on creating user login for my Java application and getting connection via JDBC. So far I tried to create a user login for my app and used following connection string, but I doesn't work at all. Any help and hint will be appreciated. jdbc:jtds:sqlserver://127.0.0.1:1433/dotcms username="shuxer" password="itarator"

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  • Java equivalent of C# @

    - by Simon Rigby
    Hi all, Quick question. Is there an equivalent of @ as applied to strings in Java: For example I can do @"c:\afolder\afile" in C# and have it ignore the escape characters when processing instead of having to do "c:\afolder\aFile". Is there a Java equivalent? hmmm: stackoverflow is escaping on me .. lol. The second example should read: c:(double-backslash)afolder(double-backslash)aFile

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