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• Multi language testing framework

  - by santiiiii

  I need to write two versions of the same application, one in .NET and the other one in Java. So I'd like to write a single test suite, and then use it against both codebases. Which testing tool would you advise me to use?

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• MVC architecture example using JSF 2.0 and EJB 3?

  - by nebiros

  Somebody knows an example of this? an application made with JSF 2.0 and EJB 3? directory structure, etc, those kind of things, I’m trying to approach the best way to create a Java EE app using those technologies.

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• Get the number of packages transmitted per connection

  - by Daniel

  How do I get the number of packages transmitted per TCP connection? I am using Java, but i know I will have to fetch the number from the underlying OS, so this quastion applies to Linux and Windows operating systems and will have different answers for each of them, I assume. I need this information to profile the network load of an application which seems to send too many small packages by flushing the socket streams too often.

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• Why does this code sometimes throw a NullPointerException?

  - by Tiberiu Hajas

  Consider the following Java source: if( agents != null ) { for( Iterator iter = agents.keySet().iterator(); iter.hasNext(); ) { // Code that uses iter.next() ... // } } The agents is a HashMap. Why does the for statement sometimes throw a NullPointerException? Thank you.

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• Hibernate - how to create list of pojos?

  - by AspNewbie

  I am very new to Hibernate. I have MySQL database and mapped pojos. What should I do next? I know little bit LINQ to SQL from .NET, and it generates me List of mapped objects. So basically, what are my next steps after creating POJOS if I want to have List of them and do CRUD operations upon them and data will be also saved in DB not only in java objects ? kthx

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• Jetty: How to write to access logs

  - by mdemmitt

  Hi all, In my Java servlet code, I want to be able to programatically write to the jetty access log. I am aware that jetty will automatically log every incoming HTTP request to the access log. However, my servlet needs to occasionally append it's own line to the access log. Has anyone here done something similar? Thanks!

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• No Android project type in Eclipse->File->New-Project

  - by Rubberman

  I am running CentOS 5.5 x86_64 with JDK 1.6, Eclipse Galileo, and the 0.9.7 ADT is installed; however, after installation, the Android project type is not available. I have checked in the installed packages list and it is installed. Anybody encounter this problem before? Could it be due to my use of the 64-bit java VM that is installed on my system?

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• Can I assign array size using NSMutableArray?

  - by Tattat

  I used to be a Java Programmer, which the array need to declare the very first time, like this: int[] anArray; // declares an array of integers anArray = new int[10]; // allocates memory for 10 integers I don't know whether the Objective C , NSMutableArray also give me this ability or not. Actually, I want to make a 10*10 array. thz in advance.

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• GAE/J datastore backup

  - by jb

  What is the easiest way to do a GAE/J datastore backup? It looks like there is python bulkloader.py tool to do backup for Python apps, but what should I do to backup Java app? Is there any way to use python tool?

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• Generic DRM (Distributed resource management) wrapper

  - by Pavel Bernshtam

  I need to write a software, which launches DRM jobs in a customer environment and monitors those jobs status. It should work with various customer environments and DRMs - like LSF, Sun Grid and others. Can you recommend some 3rd party library, which hides DRM differences from me and has API like "launch job", "get list of jobs", "get job status" etc. ? Both Java and native libraries are good for me.

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• Best Embedded SQL DB for write performance?

  - by max.minimus

  Has anybody done any benchmarking/evaluation of the popular open-source embedded SQL DBs for performance, particularly write performance? I've some 1:1 comparisons for sqlite, Firebird Embedded, Derby and HSQLDB (others I am missing?) but no across the board comparisons... Also, I'd be interested in the overall developer experience for any of these (for a Java app).

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• Is there a common way to access files, that works both on android and PC?

  - by m01

  Hi, I'm writing an application that will ship in two versions: Android and PC version. Is there a simple way to access files from the shared code? Using java.io is simple, but I don't know how to access android resources or assets using it. And I can't write methods that operate on FileInputStreams instead, because some files contain references to another ones, so I need a way to access them from the method code. Any suggestions?

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• Convert normal web service to wcf

  - by zachary

  I have a normal web service. Many java and .net users are accessing it. Can I update it to wcf without anyone having to change their code? Any tutorials?

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• Floating point arithmetics restricted to integers

  - by user396672

  I use doubles for a uniform implementation of some arithmetic calculations. These calculations may be actually applied to integers too, but there are no C++-like templates in Java and I don't want to duplicate the implementation code, so I simply use "double" version for ints. Does JVM spec guarantees the correctness of integer operations such a <=,=, +, -, *, and / (in case of remainder==0) when the operations are emulated as corresponding floating point ops? (Any integer, of course, has reasonable size to be represented in double's mantissa)

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• What will be the OOP approach? (or YOUR approach?)

  - by hsmit

  I'm having difficulties with some general OOP & Java approach. There are various ways to let classes/objects communicate with each other. To give a simple example: I need object A to perform action X. Object A needs P, Q and R to perform this action X. Will then Object A retrieve P, Q and R by itself (within action X), or must these values be parameters for action X?

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• Lucene unexpectedly gives different results when operator of search words changes

  - by Lars Andren

  I am using Lucene with Java. In the index I have a single document with a single name:value-field text:alabama oklahoma When I search for +alabama -oklahoma it returns no results, as expected. However, when I search for -alabama +oklahoma it returns the single document as a match to the query. Has anyone else noticed this behaviour? Any ideas on why this happens?

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• Dependency Injection: What's wrong with good old-fashioned refactoring?

  - by Chuck

  DI creates an extra layer of abstraction so that if your implementation class ever changes you can simply plug in a different class with the same interface. But why not simply refactor when you want to use a different implementation class? Other languages like Python and Ruby work fine this way. Why not Java?

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• What are all the concurrent things [data structure, algorithm, locking mechanism] missing in .Net 3.

  - by user49767

  First time I am bit disappointed in StackOverflow cause my http://stackoverflow.com/questions/2571727/c-concurrency-vs-java-concurrency-which-is-neatly-designed-which-is-better question was closed. My intension was just trying to gather knowledge from programming guru's who worked in both the programming technologies. Rather closing this question, please help me by discussing what is good, bad, and ugly in multi-threading part in both the platforms. It is also welcome, if someone would like to compare with .Net 4.0 with JDK 6 (or JDK 7)

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• How can I send a confirmation email to users of my application?

  - by giri

  Hi I have designed a chat application where different users can create the account, but I do not know how to send a confirmation email to the users. Since I collect their e-mail address in the registration form, how can I send mail to those addresses in Java?

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• How to set JFrame to appear centered, regardless of the Monitor resolution

  - by AmateurProgrammer

  While working in Java, I find it hard to position my Main application window in the very center of the screen when I start the application. Is there any way I can do that? I tried with some of the predefined methods but none worked. BTW it doesn't have to be vertically centered, horizontal alignment is the more important goal for me. But vertical alignment is also welcome. Thanks

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• Use the right tool for the job: embedded programming

  - by EmbeddedProg

  I'm interested in programming languages well suited for embedded programming. In particular: Is it possible to program embedded systems in C++? Or is it better to use pure C? Or is C++ OK only if some features of the language (e.g. RTTI, exceptions and templates) are excluded? What about Java in this domain? Thanks.

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• Calling super()

  - by Mike

  When do you call super() in Java? I see it in some constructors of the derived class, but isn't the constructors for each of the parent class called automatically? Why would you need to use super?

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• Dynamic Cocoon Block list

  - by Crischan

  Hi, I have a Cocoon 2.2 based application which uses blocks for different tasks and one block for shared pipeline fragments. All blocks are mounted within an Cocoon webapp. Now I would like to have an block which generates an overview of all other mounted blocks. I probably will have to use Java code - which is fine - but I am kinda lost where to start. Can anyone point me the right direction?

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• examples of good concurrent programs meant to scale

  - by vishr

  I am looking for seminal and excellent examples of libraries and projects that emulate the good practices of the Java Concurrency in Practice book. The book is marvelous. However, I think supplementing this book reading with code reviews of projects and libraries that make use of the concurrency APIs effectively is necessary to drive the concepts into the brain. One good example of what I am looking for is https://code.google.com/p/concurrentlinkedhashmap/ Can folks help me with finding exemplary, well written code that use the concurrency api well?

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• Struts 1.1 - No bean specified Error

  - by Ruepen

  What would the possible scenarios be in which I would get this error produced from a struts web app? java.lang.IllegalArgumentException: No bean specified

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