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• How to deal with "java.lang.OutOfMemoryError: PermGen space" error

  - by Chris

  Recently I ran into this error in my web application: java.lang.OutOfMemoryError: PermGen space It's a typical Hibernate/JPA + IceFaces/JSF application running on Tomcat 6 and JDK 1.6. Apparently this can occur after redeploying an application a few times.

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• Java loop for a certain duration

  - by portoalet

  Hi, Is there a way I can do a for loop for a certain amount of time easily? (without measuring the time ourselves using System.currentTimeMillis() ?) I.e. I want to do something like this in Java: int x = 0; for( 2 minutes ) { System.out.println(x++); } Thanks

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• Open PDF file on fly from Java application

  - by Mr CooL

  Is there any way to have a code where it can be used to open PDF file in Java application but do not side to any platform. I mean using batch file in Windows could do that. Can it be any other way to have platform independent code to open PDF on fly.

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• Generating Single WSDL file for Multiple JAVA classes.

  - by sachin

  We are using "Bottom Up" approach for building webservices. We have 10 java classes which we want to expose as a webservice. How can we create only one WSDL file for these classes? (java2wsdl utility & its ANT TASK takes only one class as parameter for generating WSDL file.)

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• A FileSet package/class wanted for Java

  - by Vincenzo

  Can anyone suggest a FileSet package/class in Java. By FileSet I mean a collection of files and directories together with regex-powered inclusion and exclusion rules (similar to Apache Ant). Thanks.

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• Java Real Time explanation

  - by Marcus

  What exactly is the Java Real Time Specification? That is, how does it differ from the "regular" JSE or JEE specifications?

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• Is there something like Sympy for Java?

  - by Shane Fulmer

  I'm looking for a symbolic math library for Java along the lines of sympy for Python. Does anyone know of anything? Thanks!

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• java native Process timeout

  - by deltanovember

  At the moment I execute a native process using the following: java.lang.Process process = Runtime.getRuntime().exec(command); int returnCode = process.waitFor(); Suppose instead of waiting for the program to return I wish to terminate if a certain amount of time has elapsed. How do I do this?

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• Looking for Java libraries to create a report editor

  - by Julian

  I have to develop a specialised report editor in Java. The user will get a number of fields that can be layed out on a page plus some graphical elements. The resulting report design needs to be serialized into already defined database tables. Is there any software library that will help to achieve this without reinventing the wheel? I have come across Eclipse GEF and Zest, but I am not sure if this really meets my problem.

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• Enable Java Templates in Xcode 3.2.2

  - by Mark Szymanski

  I am running Xcode 3.2.2 with the iPhone SDK and was wondering if there was any way to (re)enable Java templates from the earlier versions of Xcode. Thanks in advance!

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• Java declarations (ordering)

  - by incrediman

  In Java, what's generally the most accepted way to organize a class in terms of the order in which declared data members and methods should be listed in the class file, keeping in mind the following and anything else you can think of for each one: its visibility whether it's a constructor, method, or member if it's a method, does it overload, or override other method(s)?

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• orkut via java api

  - by angelina

  Dear all, I m building a web application from where i want to connect to orkut server,gets online friend list,scraps,send scraps.i want to use a java api for this feature.

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• how to implement k-means for simple grouping in java

  - by thandar

  Hi all, I would like to know simple k-means algorithm in java. I want to use k-means only for grouping one dimensional array not multi. For example, before grouping the array consists of 2,4,7,5,12,34,18,25 if we want four group then we got group 1: 2,4,5 group 2: 7,12 group 3: 18,25 group 4: 34

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• Getting A File's Mime Type In Java

  - by Lee Theobald

  I was just wondering how most people fetch a mime type from a file in Java? So far I've tried two utils: JMimeMagic & Mime-Util. The first gave me memory exceptions, the second doesn't close its streams off properly. I was just wondering if anyone else had a method/library that they used and worked correctly?

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• Windows temporary file in Java

  - by Przemyslaw Rózycki

  How to create a file in Windows that would have attributes FILE_ATTRIBUTE_TEMPORARY and FILE_FLAG_DELETE_ON_CLOSE set using Java? I do want my file to be just in-memory file.

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• Java Line separator File .ext separator

  - by ikurtz

  i am wondering regarding Java: is there a file extension separator? like *.doc, the "." being the question. i know there is a line.separator. just would like my app to be portable so i need to know. thank you.

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• Regexp match in Java

  - by tinti

  Regexp in Java I want to make a regexp who do this verify if a word is like [0-9A-Za-z][._-'][0-9A-Za-z] example for valid words A21a_c32 daA.da2 das'2 dsada ASDA 12SA89 non valid words dsa#da2 34$ Thanks

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• Java libarary for HTML elements/tags

  - by corgrath

  Anyone know a decent Java libarary for HTML elements? Ex if I want to create an img-element, I would go new Image(...) The object should support the normal HTML functions/attributes, such as setting CSS or disable.

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• Invoking shell from java, it complaints "stty: standard input: Invalid argument"

  - by solotim

  Hi, everybody. I invoked shell command by Process class of java and it gave "stty: standard input: Invalid argument" no matter the command is right or wrong (normal output of shell command is shown too). If I run the shell command in shell, no such error message shows. I can't figure out why. Thanks

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• Cooking Units in Java

  - by gregm

  Are there any open source libraries for representing cooking units such as Teaspoon and tablespoon in Java? I have only found JSR-275 (http://jscience.org/jsr-275/) which is great but doesn't know about cooking units.

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• Performance: Iterating through a List in Java

  - by syker

  Is it slower to iterate through a list in Java like this: for (int i=0;i<list.size();i++) { .. list.get(i) } as opposed to: for (Object o: list) { ... o }

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• How is hashCode() calculated in Java.

  - by Jothi

  What value is hashCode() method is returning in java?. i read that it is an memory reference of an object. when i print hascode value for new Integer(1), its 1. for String(a) - 97. so i confused. is it ascii or what type of value is?

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• Simple/Direct/Heredoc way of contructing a HTML string in Java

  - by das_weezul

  In python I can construct a HTML string without worrying about escaping special characters like < or " by simply enclosing the string in triple quotes like: html_string = """ <html> <body> <p>My text with "quotes" and whatnot!<p> </body> </html> """ Is there a similar way to do this in Java?

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• How to show Java dynamic table in main form instead of new generating form

  - by jitendra muradnar

  I am trying to display a java table on particular event like, when I click button. It makes a DB connection, gets data, puts it into the table, and shows the table in new window. But I want to display that table in my main form, i.e. itself button frame.

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• Java hashtable with seperate chaining collision resolution?

  - by Matt

  I have created a program using the built in java.util.hashtable but now I need to resolve collisions using separate chaining. Is it possible with this implementation of a hashtable? Is there one out there already implemented that uses separate chaining?

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