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• Usecase for Workflow Engine

  - by Icarus

  Hi, We have an issue where a Database table has to be updated on the status for a particular entity. Presently, its all Java code with a lot of if conditions and an update to the status. I was thinking along lines of using a Workflow engine since there can be multiple flows in future. Is it an overkill to use a Workflow Engine here... where do you draw the line ?

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• JTable .. colour of selected row

  - by dimitar

  Hello pip`s, I have a JTable in Java that has a custom dataMOdel and custom renderer. Now when i select some cell it has a dark blue border around it. I want the selected row to be all highlighted in some colour. How to do that?

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• Is it possible to access a running instance of an app using JNA/JNI?

  - by Carlos Blanco

  I'm writing a test engine for a Java application that has some of the code written in C. This application uses JNI to access it's native part. In the engine I'm writing, I use Fest to control de UI and perform the tests. However, I,m blind when dealing with the part that is written in C. I wonder if I can use JNA or JNI to access the native part of the app. I believe that the fact that the application is already running is huge issue here.

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• Spring + Hessian on Tomcat

  - by ILya

  Hello. I have a task to write a web service with use of Hessian and Spring. Unfortunately there is not enough information so i can't make it work myself... Please can anyone write a simple Hello World for me? My version always shows 404 when accesing with browser... I'm new to java so if smb knows how to help tell me what files of my project to share. Thanks a lot!

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• How do I run my application as superuser from Eclipse?

  - by Ronald

  I'm running in to an error when I try to run my server application from Eclipse. The error is java.net.BindException: Permission denied. I think this is because I am using port 443 to set up an SSL connection. I can get around this problem if I run my code on the command line using javac and sudo. Is there a way to set up Eclipse so that when I hit the run button, my application is executed with sudo?

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• VB6's private static in C# ?

  - by blez

  In VB6 there are local static variables that keep their values after the exit of procedure. It's like using public vars but on local block. For example: sub count() static x as integer x = x + 1 end sub After 10 calls, x will be 10. I tried to search the same thing in .NET (and even Java) but there was none. Why? Does it break the OOP model in some way, and is there a way to emulate that.

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• two dimensional array [closed]

  - by Baiba

  Can someone please write to me source code in Java? I have a task: create a program, that contains two dimensional array (with numbers) and the programm needs to sum zeros in each column and then get out the number of column in which the zeros are least.. thanks!

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• How does volatile actually work?

  - by FredOverflow

  Marking a variable as volatile in Java ensures that every thread sees the value that was last written to it instead of some stale value. I was wondering how this is actually achieved. Does the JVM emit special instructions that flush the CPU cashes or something?

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• How should I handle url routing in my application ?

  - by phmr

  I'm building a web app with custom components. I need a way to route requests to class / methods, is there any standalone java library that can achieve that (in a sexy manner [1]) ? [1] read : no xml!

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• Are Maybes a good pattern for scala?

  - by Fred Haslam

  For a while I have been struggling to integrate scala with java methods that might return null. I came up with the following utility which helps a lot: // produce an Option, nulls become None object Maybe { def apply[T](t:T) = if (t==null) None else Some(t) } Maybe(javaClass.getResultCouldBeNull()).map( result => doSomeWork(result) ) I have a few questions about this solution: Is there a better or more standard pattern to use? Am I duplicating something that already exists? Does this functionality have hidden gotchas?

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• How to LIMIT the text box length?

  - by sam

  I am working on eclipse java using swt jface with rcp. How can i limit the characters in my text box. Like if i want only 4 characters in my text box then what should i do? and what if i want alphanumeric combination . again in certain limit?

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• how to find n choose r without overflow

  - by iamrohitbanga

  I need to find the value of n choose r- the number of ways of selecting r objects out of n. if i first find the numerator then the denominator. i get an exception. i am using java. how to do it for example for 44 choose 42

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• Connecting to MS sql through hibernate

  - by Rima

  Hello All, I want to connect to MS SQl server 2005 using hibernate in java. i am unable to find the jars and the hibernate.cfg.xml file for the same. can someone help me with the same Thanks in Advance Regards, Rima

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• Mapping enum types with Hibernate Annotations

  - by Thiago

  Hi there, I have an enum type on my Java model which I'd like to map to a table on the database. I'm working with Hibernate Annotations and I don't know how to do that. Since the answers I search were rather old, I wonder which way is the best? Thanks in advance

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• Productivity research material

  - by Rune FS

  While debating which platform to use for what applications (specifically we debated c++, java, c# and f#) we tried finding scientific quality research on productivity (cost of ownership really) of similar applications build on various platforms/using the above mentioned languages. Any one know of such research?

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• Does a HashMap retain the order of its elements on the next read if it is constructed as a LinkedHas

  - by javanix

  Suppose I have a Java method that returns a HashMap object. Because a LinkedHashMap is a subclass of HashMap, I can return a LinkedHashMap from this method just fine. On the next "read" action (no adding/removing/modifying of K/V pairs), would iterating over the keys of the resulting method (which returns a HashMap) go in the same order as the originating LinkedHashMap, even though the HashMap lacks the key links?

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• JLS: Item 54 - Why classes having thread pool should not implement serializable?

  - by Maddy

  From what I understand, the object state is just stored (values for fields, etc.), however, the execution context is anyways going to be lost. What's the point of this? What bad can happen if so? Note* this was taken from Effective Java By Joshua Bloch

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• What's a good file format to use for storing player saved files?

  - by Gnarly

  I'm making a game in Java, and I need a good file format to store the player's saved data. Any suggestions? Feel free to give examples in code if you want.

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• Extract text from PDF (google app engine)

  - by Miroslav Bajtoš

  Is there any free Java library for extracting text from PDF, that is compatible with Google Application Engine? I've read about PDFJet, but it can't read PDF, can it? Is there perhaps other way how to extract text from PDF? I tried http://www.pdfdownload.org/, unfortunately they don't handle non-English characters correctly.

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• Kryo serialization library: is it used in production?

  - by Jim Ferrans

  Kryo is a very new and interesting Java serialization library, and one of the fastest in the thrift-protobuf benchmark. If you've used Kryo, has it already reached enough maturity to try it out in production code?

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• Regular Expression :match string containing only non repeating words

  - by nash

  I have this situation(Java code): 1) a string such as : "A wild adventure" should match. 2) a string with adjacent repeated words: "A wild wild adventure" shouldn't match. With this regular expression: .* \b(\w+)\b\s*\1\b.* i can match strings containing adjacent repeated words. How to reverse the situation i.e how to match strings which do not contain adjacent repeat words

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• Transaction Management

  - by Senthilnathan

  Hi all, In my code I am updating two table, one after the other. update(table1_details); update(table2_details); So if the update fails in table1 , table2 should not be updated or should be rolled back. How to handle this situation. I know I have to use transaction. Can some one help with code !!! I am using Java with spring and hibernate .

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• Parse URLs of major video streaming sites and generate appropriate code for embedding.

  - by Markus Lux

  Posting a video on tumblr.com allows you to just paste the URL of the video on youtube, vimeo, whatever and tumblr automatically does the embedding for you. I assume that this would be nothing more than a mapping between an URL-regex and the belonging HTML construct for embedding the video. Or it is just parsing the response of the URL and getting the construct from there. Is there already any utility, preferably in Java, for doing this? If not, how would you do it?

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• How to generate spectrum color palettes

  - by ddimitrov

  Is there an easy way to convert between color models in Java (RGB, HSV and Lab). Assuming RGB color model: How do I calculate black body spectrum color palette? I want to use it for a heatmap chart. How about single-wavelength spectrum? Edit: I found that the ColorSpace class can be used for conversions between RGB/CIE and many other color models.

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• How to convert MS doc to pdf

  - by magh

  How to convert doc to pdf using java api. where document contains various formats such as tables in ms word. when converting to pdf using iText. where actual document looks different to converted pdf. please provide any api not an exe installed for converting . must be an open source

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