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• Treeset to order elements in descending order

  - by Gaurav Saini

  Here is the piece of code that I have used for Java 5.0 TreeSet<Integer> treeSetObj = new TreeSet<Integer>( Collections.reverseOrder() ) ; Collections.reverseOrder() is used to obtain a comparator in order to reverse the way the elements are stored and iterated. Is there a more optimized way of doing it?

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• Critical Path Method Algorithm

  - by nunos

  Where can I find a Java implementation of the Critical Path Method Algorithm? I am sure there's some implementation in the cloud. Thanks in advance.

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• Deploy web service on Tomcat with OpenEJB

  - by kostya

  Hi, I need to deploy web service on Tomcat with installed OpenEJB. I compiled simple Hello service that just prints "Hello" with JAX-WS and tried to deploy on tomcat, but got errors while deployment : ERROR - Error deploying CXF webservice for servlet helloservice.endpoint.Hello java.lang.IllegalArgumentException: Could not find servlet helloservice in web application context /helloservice Please, help what is done wrong here. Is tomcat + openejb is sufficient for web service deployment? Thanks.

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• Set up ECLIPSE IDE Path

  - by AEIOU

  I'm still working on this problem: http://stackoverflow.com/questions/2610469/java-runtime-command-line-process Based on what one of the contributors has said I tried the following: So I've tried adding the path to "gs" in my "Run Configurations" - Environment Tab and "Linked Resources" (Preferences - General - Workspace - Linked Resources). Neither has worked... But it's still not working, I'm getting the same error. Any other ideas? Because I'm all out.

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• Deliver files from a web server from outside the web app

  - by Ankur

  Is there anyway to serve a file from a web server through the web, that is not within the web application. I am using Tomcat and a Java servlets based application. I don't want to put the files within the webapp because they are several 100GB and I will have to replace them every time I update the WAR if I put them inside it.

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• Copy Field and Methods

  - by javaguy

  I am new to java. I was wondering if there is a tool to copy fields and method easily. E.g if I have private String foo; // with getter/setters I should be able to select foo and type bar car in a textbox and the tool should generate fields bar and car with their getter/setters.

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• seeking j2ee books recommendation

  - by john

  Hi, I'm thinking of a serious training in j2ee and found there are too many books to choose from. Could you kindly share your insights as a practicing professional in this respect? For example, some people in other post recommend "SCWCD Exam Study Kit Second Edition Java Web Component Developer Certification Hanumant Deshmukh, Jignesh Malavia, and Matthew Scarpino" by quickly looking at Amazon, I found Enterprise JavaBeans 3.0 (5th Edition) [Paperback] Richard Monson-Haefel received 141 reviews.... thanks

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• Any chumby programmers out there? What's a good resource for chumby beginners?

  - by Dave Markle

  I just got this Chumby thing for Christmas. I was thinking of writing a StackOverflow widget for it. Does anyone know any caveats to programming this, or especially good things for chumby virgins to know? I have not yet begun to do my research. I guess it's just a Linux device which runs java widgets.

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• New byte in php

  - by Mantas

  I have code JAVA byte abyte1[] = new byte[k]; But php not have byte type. Its possible to convert this line to php?

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• what is the best video processing programing language ?

  - by Anas Al HAmdan

  Hello, i have 4 digital cams, the distance between every cam is 30 CM, i need a software or a programing library that works on c++ or Java, that can take videos from these 4 cams, and put them in one video showing only one image that is gathered from the 4 cams,, any hints would be helpful, Thanks anyway .

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• I need an algorithm to get the chromatic number of a graph.

  - by Carlos Sanchez

  Given the adjacency matrix of a graph, I need to obtain the chromatic number (minimum number of colours needed to paint every node of a graph so that adjacent nodes get different colours). Preferably it should be a java algorithm, and I don't care about performance. Thanks.

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• Stand-alone Bytecode Verifier

  - by HH

  In my bytecode instrumentation project, I stumble frequently on VerifyErrors. However, the default java Verifier gives little information on which instruction resulted in the error (it only gives the method and a small message). Is there any stand-alone bytecode verifier which provides with a little more advanced help in locating the error, at least the precise instruction location? Thank you.

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• Why both hashCode() and equals() exist

  - by Neeraj

  why java Object class has two methods hashcode() and equals()? One of them looks redundant and its percolated to the bottom most derived class?

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• Apache HttpClient CoreConnectionPNames.CONNECTION_TIMEOUT does nothing ?

  - by Maxim Veksler

  Hi, I'm testing some result from HttpClient that looks irrational. It seems that setting CoreConnectionPNames.CONNECTION_TIMEOUT = 1 has no effect because send request to different host return successfully with connect timeout 1 which IMHO can't be the case (1ms to setup TCP handshake???) Am I misunderstood something or is something very strange going on here? The httpclient version I'm using as can be seen in this pom.xml is <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.0.1</version> <type>jar</type> </dependency> Here is the code: import java.io.IOException; import java.util.Random; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpUriRequest; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.params.CoreConnectionPNames; import org.apache.http.util.EntityUtils; import org.apache.log4j.Logger; public class TestNodeAliveness { private static Logger log = Logger.getLogger(TestNodeAliveness.class); public static boolean nodeBIT(String elasticIP) throws ClientProtocolException, IOException { try { HttpClient client = new DefaultHttpClient(); // The time it takes to open TCP connection. client.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 1); // Timeout when server does not send data. client.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 5000); // Some tuning that is not required for bit tests. client.getParams().setParameter(CoreConnectionPNames.STALE_CONNECTION_CHECK, false); client.getParams().setParameter(CoreConnectionPNames.TCP_NODELAY, true); HttpUriRequest request = new HttpGet("http://" + elasticIP); HttpResponse response = client.execute(request); HttpEntity entity = response.getEntity(); if(entity == null) { return false; } else { System.out.println(EntityUtils.toString(entity)); } // Close just in case. request.abort(); } catch (Throwable e) { log.warn("BIT Test failed for " + elasticIP); e.printStackTrace(); return false; } return true; } public static void main(String[] args) throws ClientProtocolException, IOException { nodeBIT("google.com?cant_cache_this=" + (new Random()).nextInt()); } } Thank you.

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• Is instanceof considered bad practice? If so, under what circumstances is instanceof still preferabl

  - by aioobe

  Over the years, I've tried to avoid instanceof whenever possible. Using polymorphism or the visitor pattern where applicable. I suppose it simply eases maintenance in some situations... Are there any other drawbacks that one should be aware of? I do however see it here and there in the Java libraries so I suppose it has its place? Under what circumstances is it preferable? Is it ever unavoidable?

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• JSplitPane giving wrong resize cursor with GTK LAF?

  - by carneades

  Running the official JSplitPane demo http://java.sun.com/docs/books/tutorial/uiswing/components/splitpane.html on my Ubuntu system gives a resize cursor like -- over the divider. The behavior of native split panes gives <-- resize cursors. Does this qualify as a bug that should be reported to Sun (eh, Oracle)? Is there a workaround?

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• Code cleanup in netbeans

  - by Kapsh

  Is there something similar to the Eclipse cleanup rules ((Preferences Java Code Style Clean Up) in NetBeans? The cleanup rules in eclipse will allow you to clean things up like organizing imports, removing unnecessary casts, adding missing override annotations etc. Also can you do that on a whole set of classes/packages instead of individual classes?

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• Method overriding

  - by Gandalf StormCrow

  Can you override method in java without using annotations? Because eclipse doesn't support it if you use JRE6, you need to switch back to 5 to use @Override annotation. Will this method be overriden if I remove the annotation? @Override public String toString() { return name + " [" + genre + "]"; }

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• Calculating easter "good friday" and "easter monday" dates programmatically

  - by Glen Robertson

  I am writing a java application that uses joda time displays a calendar which highlights public holiday dates. I need to find a way of obtaining the dates for "good friday" and "easter monday, which depend on the lunar calendar. Does anyone know a good way to do this? Note: I can't use online API's to retrieve the holidays. Thanks in advance.

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• Access static enum fields using JNI invocation API

  - by Xinus

  How can we access static enum fields using JNI invocation API I am trying to access glassfish org.glassfish.api.embedded.ContainerBuilder.Type enumeration from Glassfish api using following code jclass Type= env->FindClass( "org/glassfish/api/embedded/ContainerBuilder$Type"); jfieldID Type_web=env->GetStaticFieldID( Type,"web","org/glassfish/api/embedded/ContainerBuilder$Type"); But it always gives me error as Exception in thread "main" java.lang.NoSuchFieldError: web, How can I access that field ?

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• Swt combobox name/key pair

  - by zachary

  I want to have the text say one thing, but have the value say another Text Key But it only takes a string for adding items. How do Java programmers typically store text/id pairs in comboboxes

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• I need to parse non well-formed xml data (HTML)

  - by Daziplqa

  Hi, I have some non well-formed xml (HTML) data in JAVA, I used JAXP Dom, but It complains. The Question is :Is there any way to use JAXP to parse such documents ?? I have a file containing data such as : <employee> <name value="ahmed" > <!-- note, this element is not closed, So it is not well-formed xml--> </employee>

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• Polymorphic call

  - by harigm

  I am new to java, I have seen in the code at many places where my seniors have declared as List myList = new ArrayList(); (option1) Instead of ArrayList myList = new ArrayList(); (option2) Can you please tell me why people use Option1, is there any advantages? If we use option2, do we miss out any advantages or features?

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• Convert JSON structure

  - by Scobal

  I have a set of data in one JSON structure: [[task1, 10, 99], [task2, 10, 99], [task3, 10, 99], [task1, 11, 99], [task2, 11, 99], [task3, 11, 99]] and need to convert it to another JSON structure: [{ label: "task1", data: [[10, 99], [11, 99]] }, { label: "task2", data: [[10, 99], [11, 99]] }, { label: "task3", data: [[10, 99], [11, 99]] }] What's the best way to do this with javascript/java?

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• object array mobile development

  - by mixm

  Im currently creating a tile-based game for android. Using java via dalvik JVM. im fretting over a decision to represent objects in a particular map. should i use an id based map (2 dimensional integer array) and place game logic in a separate function in the game engine, or create an object array (2 dimensional array of game objects) and store game logic within the class methods. i am thinking about the cost of object creation and garbage collection vs extensibility.

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