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  • I would like to build a Java Web Application. What's the quickest start?

    - by Vish
    I am a reasonably competent programmer, with about 11 years experience. I particularly like Ruby/Rails and ActionScript. And Java is not too hard. I'd like to develop a web application in Java in order to leverage things like BlazeDS and learn some new tricks with regard to JBoss and the whole Java App thing. But I'm having trouble - and confused - looking for a smooth start. I don't want to use Grails, thanks, I want to use Pure Java, with whatever Framework you can think of. Spring, Hibernate, lalala, it's cool. Where do I start?

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  • Dealing with Try/Catch Exceptions in Java bytecode? ("stack height inconsistent")

    - by Cogwirrel
    I am trying to do some error handling in java bytecode. I first tried to implement some catch-like subroutines, where I would check for the error condition, and jump to the appropriate subroutine, a little like: iconst_1 iconst_0 dup ifeq calldiverr goto enddivtest calldiverr: jsr divError enddivtest: idiv ...More instructions... divError: getstatic java/lang/System/out Ljava/io/PrintStream; ldc "Oh dear you divided by 0!" invokevirtual java/io/PrintStream/print(Ljava/lang/String;)V The problem with the above is that when I have multiple instructions that jump to this subroutine, I get an error message when running the bytecode, saying that the stack height is inconsistent. Perhaps using exceptions is the best way to get around this? From some googling I have found that you can create instances of Exception classes and initialise them with something like: new java/lang/Exception dup ldc "exception message!" invokespecial java/lang/Exception/<init>(Ljava/lang/String;)V I have also found that you can throw them with athrow and this seems ok. What is confusing me however is exactly how exceptions are caught. There seems to be a magical "Exception table" which glues the throwing and catching of exceptions together, but I do not know how to define one of these when writing bytecode from scratch (and assembling using Jasmin). Can somebody tell me the secret of creating an exception table? And possibly give me an example of exception handling that will assemble with jasmin?

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  • How do you set rate limit access to your API using Iptables?

    - by Cory
    How can you set rate limit access to API using Iptables. Tried to set limit using port 80, but I don't want to set limit to the web access entirely. Is there a way to specified a subdomain rather than port. Example: set rate limit to api.example.com not example.com? If there is no way to set rate limit by subdomain, what is the suggested rate limit access to port 80 without risking blocking a legitimate web user? One connection per second would be enough?

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  • is it possible to run a makefile from java?

    - by Bugzy bug
    Hi guys, i would like to ask if it is possible to run a make file in java? I was searching the internet but only got the examples of generating java make file. My case is different, what if i have makefile, but i just want to run it from java? really sorry for dumb question, but i am lost and dont even know if i can run it or not. thank you very much!

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  • Creating a provider. I receive this exception java.lang.SecurityException

    - by user308806
    Hello, I'm trying to create a provider. when I run the code i receive this exception Exception in thread "main" java.lang.SecurityException: JCE cannot authenticate the provider MyProvider at javax.crypto.Cipher.getInstance(DashoA13*..) at javax.crypto.Cipher.getInstance(DashoA13*..) at hellman.Main.main(Main.java:68) Caused by: java.util.jar.JarException: Cannot parse file:/C:/Documents%20and%20Settings/brahim%20%20chami/Bureau/Project%233/hellman/build/classes/ at javax.crypto.SunJCE_c.a(DashoA13*..) at javax.crypto.SunJCE_b.b(DashoA13*..) at javax.crypto.SunJCE_b.a(DashoA13*..) ... 3 more Java Result: 1

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  • How and Where do I learn about how to hook up my uncreated Database to a 3rd party API

    - by raln
    I want to create a database with information that I can send to a third party... they give their api on their website but they don't break it down for new / newbs like myself... I'm confused and was thinking of getting a developer to do this all for me but I DON'T want to get ripped off... and overpay All it is is a webapplication backed by a database onto their platform where they support different API's but I also need a function in my web app that can send various messages via XML, or SMPP to their webservice.. . hmm -Ken

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  • What is the difference between NULL in C++ and null in Java?

    - by Stephano
    I've been trying to figure out why C++ is making me crazy typing NULL. Suddenly it hits me the other day; I've been typing null (lower case) in Java for years. Now suddenly I'm programming in C++ and that little chunk of muscle memory is making me crazy. Wikiperipatetic defines C++ NULL as part of the stddef: A macro that expands to a null pointer constant. It may be defined as ((void*)0), 0 or 0L depending on the compiler and the language. Sun's docs tells me this about Java's "null literal": The null type has one value, the null reference, represented by the literal null, which is formed from ASCII characters. A null literal is always of the null type. So this is all very nice. I know what a null pointer reference is, and thank you for the compiler notes. Now I'm a little fuzzy on the idea of a literal in Java so I read on... A literal is the source code representation of a fixed value; literals are represented directly in your code without requiring computation. There's also a special null literal that can be used as a value for any reference type. null may be assigned to any variable, except variables of primitive types. There's little you can do with a null value beyond testing for its presence. Therefore, null is often used in programs as a marker to indicate that some object is unavailable. Ok, so I think I get it now. In C++ NULL is a macro that, when compiled, defines the null pointer constant. In Java, null is a fixed value that any non-primitive can be assigned too; great for testing in a handy if statement. Java does not have pointers, so I can see why they kept null a simple value rather than anything fancy. But why did java decide to change the all caps NULL to null? Furthermore, am I missing anything here?

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  • What is the best tool to achieve this API design?

    - by Jose Fernandez
    Our web app offers a service that allows a "Publisher" to create a website (we give them a CMS system) that is ready to provide this service to "Members" (think Shopify). We have some possible clients that wish to become "Publishers" but they already have existing websites (vbulletin, word press blog, etc) with their own user base. We wish to develop an API that would allow these "Publishers" to keep using their own websites, and embed our services into them. Our main business requirement is that once "Members" are logged into the "Publishers" existing system, they should be able to also access our website without having to log-in again OR have to create another account there. The process should be seamless to the "Member" and "Publishers" should not have to sync their user base with our system. We also want to use an existing API authentication/authorization system instead of creating our own (OAuth, OpenID, etc) What would be the best way to use OAuth to achieve this sigle-sign on design? If OAuth is not the best tool, is there any other one out there that fits our requirements?

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  • Why do Java/C# edge out C++ as the recommended language to learn OOP on S.O?

    - by viksit
    I noticed after reading the answers/discussion to this question (What is the best language to learn OOP on?) - that more and more people are recommending C# or Java over C++ to learn OOP on. A simple term search on that answer page results in 10 hits for C++, 21 for C# and 27 for Java. Now, I understand that these 2 languages fix a lot of quirks and issues with C++, and looked up these resources that relate mostly to performance, JVM vs native implementation, systems focus vs applications, manual memory management vs automated et al. My question is - are there any fundamental differences in the OO capabilities of Java/C# vs C++? Or are the former recommended purely due to their generic ease of use/improvements over the latter? Thanks. PS, I'm aware of Java interface inheritance vs C++ multiple inheritance as a difference. I would consider that an implementational one rather than functional.

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  • Samples of Scala and Java code where Scala code looks simpler/has fewer lines?

    - by Roman
    I need some code samples (and I also really curious about them) of Scala and Java code which show that Scala code is more simple and concise then code written in Java (of course both samples should solve the same problem). If there is only Scala sample with comment like "this is abstract factory in Scala, in Java it will look much more cumbersome" then this is also acceptable. Thanks!

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  • How to develop a client-server seat booking program via java socket programming ?

    - by Haxed
    I have a project to develop a client server application in java. This is to be done using socket programming. Our lecturer, used 2 files, the TCPClient.java and TCPServer.java, to make a connection and we typed "Hi" in the client and the server displayed that message. I need to develop a seat booking application. Any suggestions for tutorials or tips or a book perhaps would be nice. Many Thanks

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  • Cocoa accessibility API, can I click a window in the background without activating it?

    - by Winawer
    I've been searching forever for a solution to this, so I thought I'd seek out the brainpower of greater minds than mine. I'm developing a Cocoa app that uses the Accessibility API to manipulate another program (it's a hotkey app). The app I'm controlling typically has multiple windows open, with some hidden behind others. What I would like to do, if it's possible, is to send mouse events to windows using the Accessibility API in a way that presses a button in the window without bringing it to the foreground (interact with the window but don't activate it). The reason I'm trying to do this is that sending the mouse event to this other window will force it to the foreground and disrupt the user's interaction with the foremost window. This is possible on Windows - apparently, because apps similar to mine do it there - but I'm getting the feeling that this isn't possible with Cocoa, given the way the window manager works. Am I mistaken?

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  • How to send a text message to mobile phone via bluetooth in Java?

    - by Sebastian Dwornik
    Similar to this question. I have been tasked to develop an application using Java to send message strings from my WinXP PC to a nearby mobile phone, using only Bluetooth. I have found a free Java Bluetooth library (Bluecove) to work with, but it seems that it might not support OBEX under Windows, which as I read is necessary to perform this task. Has anyone proven this using Java? What stack and Bluetooth library did you use? Thanks. :)

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  • How can I use Amazon's API in PHP to search for books?

    - by TerranRich
    I'm working on a Facebook app for book sharing, reviewing, and recommendations. I've scoured the web, searched Google using every search phrase I could think of, but I could not find any tutorials on how to access the Amazon.com API for book information. I signed up for an AWS account, but even the tutorials on their website didn't help me one bit. They're all geared toward using cloud computing for file storage and processing, but that's not what I want. I just want to access their API to search info on books. Kind of like how http://openlibrary.org/ does it, where it's a simple URL call to get information on a book (but their databases aren't nearly as populated as Amazon's). Why is it so damned hard to find the information I need on Amazon's AWS site? If anybody could help, I would greatly appreciate it.

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  • How do you get the ethernet address using Java?

    - by Frank Krueger
    I would like to retrieve the ethernet address of the network interface that is used to access a particular website. How can this be done in Java? Solution Note that the accepted solution of getHardwareAddress is only available in Java 6. There does not seem to be a solution for Java 5 aside from executing i(f|p)confing.

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  • How do I perform this MutliArray setup in Java?

    - by Andy Barlow
    I come from a PHP background and I'm just getting my teeth into some Java. I was wondering how I could implement the following in Java as simply as possible, just echoing the results to a terminal via the usual "System.out.print()" method. <?php $Results[0]['title'] = "No Country for Old Men"; $Results[0]['run_time'] = "122 mins"; $Results[0]['cert'] = "15"; $Results[1]['title'] = "Old School"; $Results[1]['run_time'] = "88 mins"; $Results[1]['cert'] = "18"; // Will basically show the above in order. foreach($Results as value) { echo $Results[$value]['title']; echo $Results[$value]['run_time']; echo $Results[$value]['cert']; } // Lets add some more as I need to do this in Java too $Results[2]['title'] = "Saving Private Ryan"; $Results[2]['run_time'] = "153 mins"; $Results[2]['cert'] = "15"; // Lets remove the first one as an example of another need $Results[0] = null; ?> I hear there are "list iterators" or something that are really good for rolling through data like this. Perhaps it could be implemented with that? A fully working .java file would be most handy in this instance, including how to add and remove items from the array like the above. P.S. I do plan on using this for an Android App in the distant future, so, hopefully it should all work on Android fine too, although, I imagine this sort of thing works on anything Java related :).

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  • Is it worth investing time in learning low level Java?

    - by Kevin Rave
    Low level Java, I mean, bits, bytes, bit masking, GC internals, JVM stuff, etc in the following contexts: - When you are building an enterprise app using frameworks like Spring, Hybernate, etc. - Interviews for a Sr Java Developer position where you are expected work on a existing Enterprise App that was built using some frameworks (Spring, EJB, Hybernate,etc) - Architects (Java) I understand knowing the very low level is "good". But how often do you think / use of these in the real-world, unless you are developing something from the ground-up keeping performance in mind?

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  • What versions/flavors of WinZip can be opened by the gnu.java.util.zip.dll v.6.0.140.8?

    - by dreynold
    Evaluating a third party data processing tool, I have bumped into a case where some WinZip files cause an exception: Caused by: gnu.java.util.zip.ZipException: Unknown compression method 98 at gnu.java.util.zip.ZipFile.getInputStream(ZipFile.java:470) I have seen this with files created with WinZip 11.2 and newer. What's the latest version of WinZip (or compatible compression method) that the zip.dll can handle? I've been hunting for some reference on this, but other than unversioned source code, I have had little luck so far.

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  • Java: how to have try-catch as conditional in for-loop?

    - by HH
    I know how to solve the problem by comparing size to an upper bound but I want a conditional that look for an exception. If an exception occur in conditinal, I want to exit. import java.io.*; import java.util.*; public class listTest{ public static void main(String[] args){ Stack<Integer> numbs=new Stack<Integer>(); numbs.push(1); numbs.push(2); for(int count=0,j=0;try{((j=numbs.pop())<999)}catch(Exception e){break;}&& !numbs.isEmpty(); ){ System.out.println(j); } // I waited for 1 to be printed, not 2. } } Some Errors javac listTest.java listTest.java:10: illegal start of expression for(int count=0,j=0;try{((j=numbs.pop())<999)}catch(Exception e){break;}&& ^ listTest.java:10: illegal start of expression for(int count=0,j=0;try{((j=numbs.pop())<999)}catch(Exception e){break;}&& ^

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