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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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• 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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• 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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• 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 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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• Where Java applets game portals?

  - by StudioFortress

  I have started making some small Java games that run in a browser and have found a couple of game portals where I can host then (GameJolt.com, JavaGameTomb.com and Games4j.com). Most of the other portals I find either only allow Flash or offer the games for download. Apart from those above, what other portals exist that allow hosting applets?

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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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• 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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• 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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• Filtering illegal XML characters in Java

  - by GrzegorzOledzki

  XML spec defines a subset of Unicode characters which are allowed in XML documents: http://www.w3.org/TR/REC-xml/#charsets. How do I filter out these characters from a String in Java? simple test case: Assert.equals("", filterIllegalXML(""+Character.valueOf((char) 2)))

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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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• 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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• Get system information using java (embedded in a page)

  - by Anant

  Is there any way I can get system info, like processor/ram etc (preferably cross platform, in browser)? I am looking to implement this in a website, so I need it in either flash or a java applet.

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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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• Java: file write on finalize method

  - by sowrov

  In my understanding a singleton object will destroy only when the application is about to terminate. So in C++ I write a Singleton class to log my application and in that Singleton logger's destructor I log the time when my application was terminated. Things worked perfectly in C++. Now I want to have that same logger in Java, as in java there is no destructor so I implemented the finalize method for that singleton logger. But it seem that finalize method actually never get called. So, I add that System.runFinalizersOnExit(true); line, somewhere in my code (though I know it is deprecated) and that finalize method get called every time before termination of the app. But still there is a problem! If I try to write anything on file in that finalize method, It does not work, though System.out work without any problem! :( Can you guys help me on this problem? Here is a sample code of what I am try to do: Singleton Logger Class: public class MyLogger { FileWriter writer; private MyLogger() { try { this.writer = new FileWriter("log.txt"); } catch (IOException ex) { } } public static MyLogger getInstance() { return MyLoggerHolder.INSTANCE; } private static class MyLoggerHolder { private static final MyLogger INSTANCE = new MyLogger(); } @Override protected void finalize () { try { super.finalize(); System.out.println("Here"); //worked correctly. this.writer.write(new Date().toString()+System.getProperty("line.separator")); this.writer.write("End"); this.writer.flush(); //does not work! this.writer.close(); } catch (Throwable ex) { } } public synchronized void log(String str) { try { this.writer.write(new Date().toString()+System.getProperty("line.separator")); this.writer.write(str+"\n"); this.writer.flush(); } catch (IOException ex) { } } } Main: public class Main { public static void main(String[] args) { System.runFinalizersOnExit(true); MyLogger logger = MyLogger.getInstance(); logger.log("test"); } }

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• How to time Java program execution speed

  - by George Mic

  Sorry if this sounds like a dumb question but how do you time the execution of a java program? I'm not sure what class I should use to do this. I'm kinda looking for something like: //Some timer starts here for (int i = 0; i < length; i++) { // Do something } //End timer here System.out.println("Total execution time: " + totalExecutionTime); Thanks

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• Desktop Screen Streaming in Java

  - by Joannes

  Can anyone tell me how to stream my desktop through sockets in Java? I tried using screen captures and sending them 1 at a time but it's no good. Too slow! I think to redirect the video stream would be better.

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• Properly match a Java string literal

  - by Fork

  Hi, I am looking for a Regular expression to match string literals in Java source code. Is it possible?

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• java file picker with inline thumbnails

  - by Martin DeMello

  I need a nautilus-style file picker in java, where the files are shown "gallery-style" with a customisable thumbnail for each file. Is it possible to make the standard open file dialog do this? If not, does anyone know of an open-sourced widget that I can use?

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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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• Common Ancestor to Java Array and List

  - by Phuong Nguyen de ManCity fan

  In .NET, both array and list have Enumerable as ancestor, so a method that accept Enumerable as an argument can receive both array and list as its argument. I wonder if there is a similar thing in Java?

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• couldn't start a java application as a windows service

  - by rgksugan

  I have written a java application which is a RMI server. I need to start rmiregistry to run this application and i also want my apllication to start automatically when the system starts. I have converted my application into a windows servise. When i try to start my service it shows this error Error 1067: The process terminated unexpectedly Is it because my program throws an exception when my application is started before the rmiregistry is started.

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• parsing JSON in java ?

  - by bukuai

  How to parsing JSON in java? { "code": 100, "message": "SUCCESS", "result": { "list": [ { "cardNumber": "ALUFZZ5SZ1Q5", "expireTime": 1270742400, "surplusThreshold": 4, "uid": 771292, "useTime": 1270214375, "wareId": 1145 }, { "cardNumber": "ALUFZZ5SZ1QD", "expireTime": 1270828800, "surplusThreshold": 7, "uid": 784289, "useTime": 1270302200, "wareId": 1145 }, { "cardNumber": "ALUFZZ5SZ1RC", "expireTime": 1270828800, "surplusThreshold": 10, "uid": 773664, "useTime": 1270300871, "wareId": 1145 }, { "cardNumber": "ALUFZZ5SZ1UM", "expireTime": 1270828800, "surplusThreshold": 10, "uid": 779560, "useTime": 1270282841, "wareId": 1145 }, { "cardNumber": "ALUFZZ5SZ1VT", "expireTime": 1270656000, "surplusThreshold": 2, "uid": 754099, "useTime": 1270106775, "wareId": 1145 } ], "pageCount": 61, "pageIndex": 2, "pageSize": 5, "recordCount": 308 } }

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• Java's equivalent to bisect in python

  - by systemsfault

  Hello all, Is there a java equivalent to python's bisect library? With python's bisect you can do array bisection with directions. For instance bisect.bisect_left does: Locate the proper insertion point for item in list to maintain sorted order. The parameters lo and hi may be used to specify a subset of the list which should be considered; by default the entire list is used.

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