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  • Java - Problem with the classpath on Eclipse.

    - by Amokrane
    I'm trying to recompile a project I've been working on and I keep getting an error message when trying to load a property file: The system cannot find the path specified. I guess this has to do with the classpath. But I've added the path to the file in Properties- Java build path- Libraries (external class). I also checked the .classpath file generated by eclipse, and the path is really there! Why isn't Eclipse looking at the right path?

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  • How to create a true singleton in java?

    - by rjoshi
    I am facing a problem with my singleton when used across multiple class loaders. E.g Singleton accessed by multiple EJBs. Is there any way to create a singleton which has only one instance across all class loader? I am looking for pure java solution either using custom class loader or some other way.

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  • Finding Last Fired time using a Cron Expression in Java

    - by a-sak
    Is there a way in Java to find the "Last Fired Time" from a Cron Expression. E.g. If now = 25-Apr-2010 10pm, cron expression "0 15 10 ? * *" (quartz) should return me 25-Apr-2010 10:15am I do not care if we use standard cron expressions (like Unix and Quartz) or less popular ones if they can fetch me the correct "Last Fired Time"

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  • Java: thread-safe RandomAccessFile

    - by Folkert van Heusden
    Hi, After some serious googleing I found out that the RandomAccessFile-class is not thread-safe. Now I could use one semaphore to lock all reads and writes but I don't think that performs very well. In theory it should be possible to do multiple reads and one write at a time. How can I do this in Java? Is it possible at all? Thanks!

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  • hardware detail using Java

    - by Anup Prakash
    I want to make a java application software which give the current status/information of the running computer. So, for this, is there any inbuilt/extrnal library present or not? Can anyone give a simple code which will just. "What is the current status of laptop battery?" or "Is AC adapter is pluged in or not?" Please help me.

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  • Unit testing Google wave robots in Java

    - by Paul
    Any tips or best practices for unit testing Google Wave robots written in Java? I'm expecting to deploy on AppEngine, if that helps. I'm a fan of TDD but new to both Wave Robots and AppEngine, so I'm hoping to use TDD to help me explore the design space.

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  • java array manipulation

    - by sachin
    Hi, I'm a beginner in java. I want the logic of the small program. I have two arrays array = {a1,a2,a3,a4,a5,,,,,,,,,an} and array2 = {b1,b2,b3,b4,,,,,,,,,,,bn} I want string as: a1b1,a2a3b2b3,a4a5a6b4b5b6,..........an Please tell me what will be the logic.

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  • How to import your own non-packaged Java classes in Jython

    - by thepandaatemyface
    I know in Jython you can do import java.util.Random as Random Random().nextInt() But if I have a class I wrote myself, how can I import it into Jython without putting the class itself in a package? If I have a testclass Test: public class Test { public void foo() { System.out.println("bar"); } } that's not inside a package. Can I even import that into jython by using something along the lines offrom Test import Test?

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  • Return number of rows affected by SQL UPDATE statement in Java

    - by Krt_Malta
    I'm using a MySQL database and accessing it through Java. PreparedStatement prep1 = this.connection.prepareStatement("UPDATE user_table SET Level = 'Super' WHERE Username = ?"); prep1.setString(1, username); The update statement above works fine however I'd like to get the number of rows affected with this statement. Is this possible please?

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  • Task queue java api

    - by user268515
    Hi i'm working in task queue concept.... First i struggled to program using task queue and i asked many doubts in stack overflow and Google app engine java. After a search i got a sample program for task queue. http://gaejexperiments.wordpress.com/2009/11/24/episode-10-using-the-task-queue-service/ It will very useful for beginners Like me. Regards, Sharun.

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