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• Error on MulticastSocket.joinGroup()

  - by Pedro Ghilardi

  I'm trying to execute a simple example of Multicast sockets on Java. MulticastSocket s = new MulticastSocket(6789); InetAddress group = InetAddress.getByName("230.1.1.1"); s.joinGroup(group); This code generates the error: IP_ADD_MEMBERSHIP failed (out of hardware filters?) Any idea? Thanks

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• Web Application

  - by Raydon

  I'm designing a web application. I was wondering if it was feasible to design a php front end (using some php framework e.g. CakePHP), which stores and retrieves data to display to the user. Then develop a java backend which listens to the database for changes, and depending on what was changed, performs some actions and updates the database. Any thoughts on this type of implementation would be appreciated.

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• Get all characters from a string with their number

  - by terence6

  How in Java can I get list of all characters appearing in string, with number of their appearances ? Let's say we have a string "I am really busy right now" so I should get : i-2, a-2, r-2, m-1 and so on.

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• Can I move another program's window to the front of focus?

  - by TwentyMiles

  I am interacting with a third party application using it's API, and would like to move it to the front of focus (so that it is on top of all other open windows) when a user performs a certain action. While I can move my application up and down in the hierarchy pretty easily, there doesn't appear to be a way to interact with other windows. Is it possible to move another program's window to front with Java?

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• j2ee good and reliable books

  - by user161004

  Can anybody suggest some good books for starting J2EE? I have done Core and Advanced Java ( up to Swing).

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• Calling outer class function from inner class

  - by santose

  hi, I have implemented a nested class in java. And I need to call the outer class method from inner class. //Code class outter{ void show(){ SOP("outter show"); } class inner{ void show(){ SOP("inner show"); } } } How can I call the outter method "show".

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• Eclipse Type Hierarchy Question

  - by Tom Tresansky

  In Eclipse, the Java Method Override Indicator is the little upwards arrow next to a method in the Type Hierarchy view. A solid arrow means a method overrides an existing method lower in the hierarchy. What does the hollow arrow mean? Do annotations effect either arrow?

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• Strange eclipse error

  - by Gandalf StormCrow

  Has anyone expirience this error before: this happens when I hit CTRL + space , here is the error : For those who has tinyurl blocked: This compilation unit is not on the build path of the java project. This is a maven project, mvn eclipse:eclipse doesn't help I mean it compiles and runs just fine just something is wrong and I can't figure out what. I checkouted this project from SVN, it wasn't developed on my PC.

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• If I'm running my App Engine app on localhost, will I not see a value for X-AppEngine-Country?

  - by Bartholomew

  According to the Release Notes: All user request have an X-AppEngine-Country header which contains the ISO-3166-1 alpha-2 country code for the user, based on the IP address of the client request. My app is running on localhost with the 1.5.1 Java release which contains the X-AppEngine-Country header but I don't seem to be receiving any value for this header in my requests. Do I have to deploy the app to a production instance to test this feature?

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• how to chose an open source library ?

  - by radi

  hi guys , when every one of us program in java he would need a library (some jars) to complete his work . so when this programmer find some libraries he need . how he can find the best of these libs ? thanks.

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• What are C/C++ specific idioms?

  - by Ole Jak

  thay say A good C/C++ programmer should be familiar with language idioms that typically do not exist for ex in Java. What are such idioms?

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• Is there a possability that method executes only once

  - by Gandalf StormCrow

  I have a for loop and structure like this : for(....) .... .... if(isTrue) ... do something.. .. method to be executed once (doTrick) is declared outside for loop. ....endif endfor public void doTrick() ... ... ..end Is it possible for a method in for loop to be executed only once? I'm using JAVA

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• Embedding a Jar into a C# Form

  - by clone1018

  Ok this situation is a bit difficult. But I am trying to embed a Java Jar into a C# form. Not as a new window or new process. The Jar will be a game that uses the LWJGL library. The C# Form will be a "wrapper" for it with tools and more. Anyone have any ideas? Is this even possible?

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• LinkedBlockingQueue limit ignored?

  - by tgguy

  I created a Java LinkedBlockingQueue like new LinkedBlockingQueue(1) to limit the size of the queue to 1. However, in my testing, this seems to be ignored and there is often several things in the queue at any given time. Why is this?

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• Where can I find a good introductory tutorial for Spring?

  - by will

  I am a Java developer but up to now have not had any hands on experience using the Spring framework. Does anyone know of anyone good online tutorials that explain the basics and offer good examples and sample code.

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• final fields and thread-safety

  - by pcjuzer

  Should it be all fields, including super-fields, of a purposively immutable java class 'final' in order to be thread-safe or is it enough to have no modifier methods? Suppose I have a POJO with non-final fields where all fields are type of some immutable class. This POJO has getters-setters, and a constructor wich sets some initial value. If I extend this POJO with knocking out modifier methods, thus making it immutable, will extension class be thread-safe?

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• Scanner method to get a char

  - by bizarrechaos

  What is the Scanner method to get a char returned by the keyboard in Java. like nextLine() for String, nextInt() for int, etc.

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• Code formatting for initializing lists

  - by Roman

  I've just found in my java project this code snippet: List<IssueType> selectedIssueTypes = new ArrayList<IssueType>(); for (Object item : selectedItems) selectedIssueTypes.add((IssueType) item); How do you think, can this style be used?

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• CMS for a fairly large Mobile Website - Please Help Select.

  - by Vinod

  I am looking for :- A mature, scalable and proven CMS solution With Support for Mobilization (Android and iPhone) Good Amount of Customization using Java / .NET Lots of out of the box components to choose from. Please help with recommendations. p.s Are there any Mobile CMS providers which works in a SaaS model?

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• Is there anything else other than class, interface or Enum?

  - by GK

  As we know to generate a class file there should be atleast one class or interface or an Enum should be declared in the java file. So i was curious that is there anything else as well other the mentioned which can cause a class file generation. Or did anybody think that as we can declare the above mentioned, we can declare this(Which you think) as well ?

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• Why would an Enum implement an Interface?

  - by kunjaan

  I just found out that Java allows enums to implement an interface. What would be a good use case for that?

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• configuring sms lib for use

  - by jabsy

  i want to write an application that sends bulk sms in java and i have a tutorial but i have to configure sms lib for me to use my modem as the port. can somehelp

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• Comparing the values of two generic Numbers

  - by PartlyCloudy

  I want to compare to variables, both of type T extends Number. Now I want to know which of the two variables is greater than the other or equal. Unfortunately I don't know the exact type yet, I only know that it will be a subtype of java.lang.Number. How can I do that? Thanks!

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• malformed url exception

  - by Bunny Rabbit

  https://twitter.com/sessions?authenticity_token=b1b43178e09c1e6ccec1b3183f1f139f39643aaf&session%5Busername_or_email%5D=ddddd&session%5Bpassword%5D=rrrrr&q=&site_action=https%3A%2F%2Ftwitter.com%2Fsessions&serialized_string=Hello why is this url throwing a java.net.MalformedURLException??

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• building Q&A website : what CMS to use ?

  - by radi

  hi guys , i want to design a small website like stackoverflow (but in deferent language) and i want to use an opensource secure scalable cms to do that , so what cms to use ? ( i prefer using java ) thanks .

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