I use java mostly for gui programming and php for web programming but i really don't like not having a statically typed language. For my next project i would like to use java instead of php. What is the difference between jsp and servlets? ...
I would like to get a second opinion on how to handle Exceptions within "events" (key input, screen update etc). In this case I have control over the event-sender. So a module is set to handle an event (it implements a listener interface, and is registered against an event sender): public void DefaultSet ( CardData oldDefault, CardDat...
I am currently working on a pretty large Java 6 application where we are looking to split some of our functionality out into a service oriented architecture. It seems that the primary SOA framework for the application space is OSGi and I have been looking into Felix and Knopplerfish but I wanted to make sure that this isn't my only opti...
I often find myself needing a quick ( in terms of code ), lightweight ( in term of runtime, dependencies) persistence solution for simply a bunch of objects, mainly between application restarts. Usually I resort to some Java serialisation hack, but I wonder if there's something better out there. Have you used something similar? To ...
I'm learning Java, and the book I'm reading has the following example on cloning. In clone(), my first instance is able to set buffer on the new object even though buffer is private. It seems like it should require the field to be protected for this to work. Why is this allowed? Does clone() have special privileges that allows it to acc...
I have a formatted text field for ip address: ipmask = new MaskFormatter("###.###.###.###"); ipmask.setPlaceholderCharacter(' '); field = new JFormattedTextField(ipmask); field.setValue("111.222.333.444"); works but field.setValue(" 10.222.333.444"); does not work field.setValue("10 .222.333.444"); does not work field.setValue("10....
Hi, I wrote a Listener. Now I want to notify it, when a change occurs. Nothing special. Now I'm asking myself: Is there I standard class for Events that I can use, or do I have to write a new one by myself? I know there ara java.awt.Event and AWTEvent. But I am not working directly at GUI level here. Furthermore we are using Swing at...
How performant is the entity bean? Would it be too much to ask if I want 1000 objects per table (probably about 20 tables) across 5 processes where some processes might be changing the objects as often as 60 times a second? Are there any resources out there on the limitations of the entity bean? Thanks for any help! ...
I have a third-party jar file that comes with the javadocs for only part of the API. Is there a way to reverse engineer the jar file to obtain a complete listing of classes and methods? ...
Hi folks, I wonder if there is a special reason in Java for using always "extends" rather than "implements" for defining bounds of typeparameters. Example: public interface C {} public class A<B implements C>{} is prohibited but public class A<B extends C>{} is correct. What is the reason for that? ...
I am ActionScript 3/Flex programmer, it is the first language I learned. I want to learn either Java or C++. Would one of these be easier to learn based on my current knowledge? ...
I am working on a Java project that I want to deliver to my client as a .jar file. However, I want to allow the client to be able to change the parameters of the program without having to recompile or recreate the .jar. Basically, I want to be able to load .properties files from classes inside the .jar but locate those .properties file...
If you know babylon translation tool you'd know its word capture feature - when you right click on a word - it tanslates it (from a browser or any documtent). I want to get the same tool - what program language should i use ? The os i want to get it work on is win-xp and ubuntu. and I'm writing my program in java. if it could happen fr...
Wondering if anyone has experience and/or sample code for making DDE calls from Java. I've done DDE using win32 calls from the stddde library (DdeInitialize, DdeClientTransaction), and could write a JNI wrapper for this, but I was thinking that it might be nice to do it from JNA I also have some concerns about the fact that DDE calls n...
I'm looking for resources to help migrate my design skills from traditional RDBMS data store over to AppEngine DataStore (ie: 'Soft Schema' style). I've seen several presentations and all touch on the the overarching themes and some specific techniques. I'm wondering if there's a place we could pool knowledge from experience ("from the...
I come from a C/C++ background and now do a lot of C# stuff. Lately I have become interested in doing some projects in Java since playing around with the Android SDK. I know that Java apps run in a sandbox that can limit their access to the system. In a desktop/server application environment what kind of things are restricted? ...
Our product is halted at Java version 1.5.0_13 and we would like to upgrade. Our software deploys a large number of jars via Java Web Start; all of these jars must be signed. However, a couple of the jars do not contain class files, and starting with Java version 1.5.0_14, it appears that the jarsign utility chooses not to sign any jar...
I'm working on a standard Java system with critical timing requirements for my producers (1/100s of ms matters). I have a producer placing stuff in a blocking queue, and a single consumer later picking up that stuff and dumping it to a file. The consumer blocks when data is not available. Obviously, blocking queue is the appropriate...
Is there any way of specifying the current directory in a java properties file? i.e. something like: fileLocation={currentDir}/fileName.txt ...
We are converting a C++ project to Java where we generate reports in ".doc" extension. The problem is we don't use any third party library to generate MS Word document, rather a file with .doc extension. Everything works fine except that we can't seem to find a way to add a Header at the beginning of every page. Using line numbers is not...