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• UnsupportedOperationException on Collection

  - by Duke Vador

  While studying the Collection API, we find that some methods (add, remove,...) may throw a java.lang.UnsupportedOperationException if the current implementation of the Collection does not support those functionalities. Is there,actually, in the JDK, a concrete Collection that does not support those methods ? Thanks a lot for your answers.

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• displaying special characters in hyperlink text

  - by swati

  i have used html in my java class and in one case i have used username.Username is a variable which gets values dynamically. in one case its value is 'rg@bg' but here instead of d name i m getting d url which it is directed to in my jsp. how do i ensure tht d value of username comes on d display page as it is. i have tried "@"+username. didnt work

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• Block windows shutdown

  - by Stas

  Hi! I need execute some code before Windows shutdown process each time. So, I want block Windows shutdown process for some time. How can i do it from Java or C++ Builder ? Thanks.

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• Passing JSON through the URI

  - by Leaf

  I'm trying to create a REST based web service with data encapsulated using JSON. My problem is when I pass the string version of JSON in the URI it turns to something like this: %7B%22coal%22:100,%22ele%22:1500.1%7D. I'm wondering if there are any functions Java for converting between the escaped and unescaped versions so I can parse the string.

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• "Cannot find symbol" problem when using Class.forName().

  - by joseph

  I'm getting the Cannot find symbol error from my code. Does anyone know what can cause this problem? // Register JDBC driver Class.forName("net.sourceforge.jtds.jdbc.Driver"); method forName(java.Lang.String) Class.forName("net.sourceforge.jtds.jdbc.Driver); ^

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• SIP communicator client

  - by Afro Genius

  I want to build a sip client based on SIP Communicator - the Java VoIP and Instant Messaging client. Basically I need to plug in some how and redirect VoIP to and from my application. Where is a good place to start? If this seems a bit vague, I do apologize.

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• I am faceing problem with this error of struts application.

  - by Sanjeev

  I am using My-eclipse and doing a struts project there is no syntax error but on starting tomcat server the following error appear in console. java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory and javax.servlet.UnavailableException: Parsing error processing resource path jndi:/localhost/strutspro/WEB-INF/struts-config.xml any idea whats the problem.

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• How to detect when an attribute is modified by calling reflection methods

  - by Oleg Pavliv

  I have the following class public class MyClass { private int myAttr; public void setAttr(int a) { myAttr = a; Thread.dumpStack(); } } That way I can detect any attempt to modify myAttr. Well, almost any. It does not work when someone modifies myAttr using Field.set() method. How can I trap Java reflection usage?

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• Formatting a long timestamp into a Date with JSTL

  - by scubabbl

  I am pulling a long timestamp from a database, but want to present it as a Date using Tags only, no embedded java in the JSP. I've created my own tag to do this because I was unable to get the parseDate and formatDate tags to work, but that's not to say they don't work. Any advice? Thanks.

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• A question about GC

  - by chun

  This is a quesiton taken from a java exam, How many objects are eligible for gabage collection at #1 ? public class Main { Integer x = 32768; public static void main(String[] args) { Main m = new Main(); m = null; // #1 } } I thought it just collect Integer x, does GC even collect the Main object m?

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• Implementing C# for the JVM

  - by Rob

  Is anyone attempting to implement C# for the JVM? As a Java developer, I've been eyeing C# with envy, but am unwilling to give up the portability and maturity of the JVM, not to mention the diverse range of tools for it. I know there are some important differences between the JVM and CLR but is there anything that is a showstopper?

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• enable HeapDumpOnOutOfMemoryError in runtime

  - by Schildmeijer

  according to http://java.sun.com/javase/6/webnotes/trouble/TSG-VM/html/clopts.html it should be possible to enable -XX:+HeapDumpOnOutOfMemoryError using JConsole in runtime. How? I assume its somewhere under MBeans tab and the com.sun.management - HotSpotDiagnostic - Operations - setVMOptions ?

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• If I want to develop games that are interactive on a website and can communicate with the server, sh

  - by J Lynch

  If I want to develop games that are interactive and can communicate with the server, should I learn to program in Flash, SIlverlight, or Java?

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• Graceful way to exit a dm_job ? System.exit()?

  - by Ayrad

  If I want to properly exit a documentum java job (if params are invalid for example), should I use a system.exit() or is there another way to do it. As far as I know system.exit closes the virtual machine, does it have an effect on other jobs running?

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• will php/apache ever support multi threading?

  - by fayer

  i mainly focus on the web, i think i will never create desktop applications. so i think it's better for me to focus on typical web languages like php. i know an advantage java has over php is multi threading though. will php ever support this feature in the future? thanks

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• commons-logging-1.1.jar; cannot read zip file entry

  - by user1226162

  I have imported a GWT project from GIT , but when i run maven Install it says .m2\repository\commons-logging\commons-logging\1.1\commons-logging-1.1.jar; cannot read zip file entry and if i simply run my application , i get this \git\my-Search-Engine\qsse\war}: java.lang.NoClassDefFoundError: com/google/inject/servlet/GuiceServletContextListener I tried to find out the way , one solution i found was to move the guice-servlet-3.0 from build path to \qsse\war\webinf\lib but if i do that i start gettin the exception ava.lang.NoClassDefFoundError: com/google/inject/Injector any idea how can i resolve this

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• Reading POM's with it's children

  - by khmarbaise

  Based on the post it is mentioned (By Brett Porter) that a POM can be read. What i need is to read not only a single pom. I need to read the whole tree of pom's in a multimodule build. Starting with the root pom and it should read automatically the child pom's if it's possible? I need to do this in separate Java Code not in relationship with Maven itself.

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• Where can i find exercises for familiarising OOPS

  - by CrazyBoy123

  Now that i have learned the theory of OOPS in good number of books , and practised a little. Still i am not comfortable when i look into OOPS being applied in some of the Open Source projs. Can someone suggest any problem / solution kind of book , or any resources , that covers OOPS end - end. (C# , Java preferably)

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• pdf to ps converter

  - by amit

  hi i am trying to create a pdf to ps convereter using java. i would like to know if there exist some library tools for this task??

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• I need an algorythm to get the cromatic number of a graph.

  - by Carlos Sanchez

  Given the adjacency matrix of a graph, i need to obtain the cromatic number (minimum number of colours within you can paint every node of a graph). preferably it should be a java algoryhtm, and i don't care about performance. thanks.

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• What is the recommended way to set GET parameters on a Restlet request?

  - by Simon Nickerson

  What is the recommended way of setting GET query parameters on a Restlet Request object? I think I can see how to get them out of the request using getQueryAsForm(), but how do they get set in the first place? At the moment, I am adding them manually to the URL using a StringBuilder and java.net.URLEncoder, but it seems like there should be a better way.

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• How can i maintain last cookie value in flex with jsp?

  - by praveen

  Hi All, my login form in flex when I login I have created a cookie in jsp like this name setValueCookie.jsp <%@ page language="java" import="java.util.* , javax.net.*" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <% String username = request.getParameter("value"); System.out.println("Email got in cookieSet = " + username); if(username==null) username=""; Date now = new Date(); String timestamp = now.toString(); Cookie cookie = new Cookie("username",username); cookie.setMaxAge(365 * 24 * 60 * 60); response.addCookie(cookie); %> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>DashBoard-Cookie</title> </head> <body> </body> </html> now using Http service request parameter i am passing username 'Value' to this jsp. and i am reading cookie value from getValueCookie.jsp like this <% String cookieName = "username"; Cookie cookies [] = request.getCookies (); Cookie myCookie = null; String result; if (cookies != null) { for (int i = 0; i < cookies.length; i++) { if (cookies [i].getName().equals (cookieName)) { myCookie = cookies[i]; break; } } } %> <data> <status><%=myCookie.getValue().toString()%></status> </data> through the httpservice value i am getting but if i open a new window or any new tab cookie value is not getting how can i solve this? Thanks in advance.

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• Smart Cards Development

  - by user292395

  I need a 'java' source code on how to extract a cap file from the computer and divide it into blocks in order to send it using APDUs to the smart card to install or load or delete an application. Thanks in advance.

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• Viewing complete strings while debugging in Eclipse

  - by Raj

  Quick question: While debugging Java code, Strings show up only till a certain length, after which Eclipse shows "..." Is there any way to inspect the entire string? (This eases the pain of adding logging statements for debugging everywhere)

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• Is MobiForms for Android worth investigating ?

  - by Alan B

  I'm working my way through the NotePad tutorial, and that's all fine - I'm not a Java programmer but it's close enough to C# (or vice versa) to make it easy to pick up. I'm surprised that there aren't any RAD tools for Android apart from Mobiforms. Is there anyone out there with experience of Mobiforms ?

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