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• grabbing image from url in google app engine, java

  - by Ashich

  Hey guys; I have a url which leads to in image. How do i grab this image from this url into my servlet? NOTE: the web-app is deployed on google app engine. java.net.URL myURL = "http://a3.twimg.com/profile_images/150131301/slogo4_normal.jpg"; //code to grab the image Thank you

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• Java: Is catching exceptions asynchronous?

  - by Gabriel Šcerbák

  I am asking because if it is not, it can be abused as synchronizations mechanism. I am asking about Java.

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• tabs problem in java swings

  - by charan

  hi all... i had created 8 tabs in tabbed panel using java swings. the problem is when i enter data in any tab and click the save button. after clicking it leaves the present tab/panel and going to first tab. i have to retain on the same tab after clicking the save button.. so please help me on this

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• How can I open a webpage and run a javascript function from a Java app

  - by Deelo55

  Hi, I would like to open a webpage and run a javascript function from within a java app. For example I would like to open the page www.mytestpage.com and run the following javascript code:document.getElementById("txtEmail").value="[email protected]";submit();void(0); This works in a browser...how can I do it programatically? Thanks!

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• How to launch java application from Dock, Mac

  - by Sunil Kumar Sahoo

  I have created a Java Swing application. It works fine. I have created application file (.app) for that application using jar bundler. But the main problem is that my application does not open if I click it on the Dock. I am using Mac OS. How I can launch my application by clicking on Dock Thanks Sunil Kumar Sahoo

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• Java - store sensitive data

  - by Mike

  Hello. I develop application with Java. I need to store some initial configuration data in some kind of file. I want my app to be able to read this data, but I don't want user to do so. Example : application loads IP from encrypted file. User sees like "dsda@#21da@" so he won't bother doing anything :) How should I do such a thing? Thanx!

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• Getting the size (in bytes) of the ResultSet using java code

  - by Bhaskara Krishna Mohan Potam

  How to get the size(in bytes) of the given ResultSet within the java code. Is there any direct way to find out?

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• Pass and return custom array object in ibatis and oracle in java

  - by Justin

  I've looked around for a good example of this, but I haven't run into one yet. I want to pass a custom string array from java to oracle and back, using the IBATIS framework. Does anyone have a good link to an example? I'm calling stored procs from IBATIS. Thanks

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• Deploying java class files without restarting JBoss

  - by varunwg

  Hi, I would like to know if its possible to deploy java class files without restarting JBoss server. I am using jboss v4.2.2. Also, when I try to deploy jsp files, it works fine and server picks up the changes almost instantly. Thanks a lot in advance :)

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• Java for a C programmer?

  - by Brian

  Hi, I have a lot of experience in C and Python, but I'd like to pick up some Java. I was curious if there was a "quick and dirty" guide tailored for people with previous CS background. I'd prefer free online resources but appreciate any suggestion. Thanks, Brian

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• JAVA gzip.read AND PHP

  - by Mantas

  I have line in JAVA and in while i get number: i = gzipinputstream1.read(abyte0, j, 4096); From while number: 959 1552 1577 1617 1680 when i want use in php: $i = fread($handle, 959): while return: 959, 959, 959, 5 How make that in PHP result will be the some. thanks

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• Java Interger: what is faster comparison or subtraction?

  - by Vladimir

  I've found that java.lang.Ingteger implementation of compareTo method looks as follows: public int compareTo(Integer anotherInteger) { int thisVal = this.value; int anotherVal = anotherInteger.value; return (thisVal<anotherVal ? -1 : (thisVal==anotherVal ? 0 : 1)); } The question is why use comparison instead of subtraction: return thisVal - anotherVal;

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• DB2 AS400 Java function always returns same value

  - by Nimrod Shory

  Hello, I am writing a user defined function to DB2 on AS/400 in Java and the strangest thing happen.. I am always getting the same result from the function even when i am changing it, even if i am dropping it and create it again and even when i specify NOT DETERMINISTIC.. Does any one have ever encountered a behavior like that?

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• Examples of good Java desktop applications

  - by Abdullah Jibaly

  More of a wiki list/collection, I'm looking for a list of good Java desktop apps. I've added a couple below to get started. Please list the framework/widget toolkit being used if it's know as well.

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• Java: Cannot listen to port, BindException

  - by bguiz

  Hi, I am developing an application in Netbeans, and it is using JavaDB. I can connect to it and execute queries without issues, but for some reason, the "Output - JavaDB Database Process" pane within Netbeans keeps displaying Security manager installed using the Basic server security policy. Could not listen on port 1527 on host localhost: java.net.BindException: Address already in use How do I find out what process is already using, or bound to, that port number?

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• Simple RSA encryption (Java)

  - by jake blue

  This is simply for fun. This will not be used for any actual encryption. I'm only first year comp sci student and love cryptography. This took a long time to get working. At approximately N = 18, it begins breaking down. It won't encrypt messages properly after that point. I'm not sure why. Any insights? I'd also appreciate any links you could provide me to tutorials or interesting reading about Cryptography. import java.math.BigInteger; import java.security.SecureRandom; /** * Cryptography. * * Generates public and private keys used in encryption and * decryption * */ public class RSA { private final static BigInteger one = new BigInteger("1"); private final static SecureRandom random = new SecureRandom(); // prime numbers private BigInteger p; private BigInteger q; // modulus private BigInteger n; // totient private BigInteger t; // public key private BigInteger e; // private key private BigInteger d; private String cipherText; /** * Constructor for objects of class RSA */ public RSA(int N) { p = BigInteger.probablePrime(N/2, random); q = BigInteger.probablePrime(N/2, random); // initialising modulus n = p.multiply(q); // initialising t by euclid's totient function (p-1)(q-1) t = (p.subtract(one)).multiply(q.subtract(one)); // initialising public key ~ 65537 is common public key e = new BigInteger("65537"); } public int generatePrivateKey() { d = e.modInverse(t); return d.intValue(); } public String encrypt(String plainText) { String encrypted = ""; int j = 0; for(int i = 0; i < plainText.length(); i++){ char m = plainText.charAt(i); BigInteger bi1 = BigInteger.valueOf(m); BigInteger bi2 = bi1.modPow(e, n); j = bi2.intValue(); m = (char) j; encrypted += m; } cipherText = encrypted; return encrypted; } public String decrypt() { String decrypted = ""; int j = 0; for(int i = 0; i < cipherText.length(); i++){ char c = cipherText.charAt(i); BigInteger bi1 = BigInteger.valueOf(c); BigInteger bi2 = bi1.modPow(d, n); j = bi2.intValue(); c = (char) j; decrypted += c; } return decrypted; } }

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• question about complex values in java

  - by davit-datuashvili

  We know that the general form of complex numbers is like this: z=a+i*b, where i is sqrt(-1). I have a question about how to express this in Java ?

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• Accessing the shadowed field from enclosed member class (Java)

  - by kolm

  Hi there, is it possible to access a shadowed field of an enclosing class from the enclosed one in Java? public class Inherit { public int a = 3; private int b = 5; public class Inheriting { public int a = 23; private int d = 8; public void f() { System.out.println("Here I want to get a = 3"); ... } } } Cheers!

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• Create a SortedMap in Java with a custom Comparator

  - by kunjaan

  I want to create a TreeMap in Java with a custom sort order. The sorted keys which are string need to be sorted according to the second character. The values are also string. Sample map: Za,FOO Ab,Bar

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• Fading Indicator message in Java

  - by jtzero

  How to/What is a good library, to create a fading indicator message in Java like that of Outlook when you get a message, or Ubuntu/Gnome when you've connected to a network?

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• When to use primitive and when complex types in java

  - by Gandalf StormCrow

  Hello, In which case should you use primitive types(int) or complex types(Integer)? Ex: http://stackoverflow.com/questions/2508918/why-java-compiler-does-not-like-integer-as-type-for-values-in-hashmap this example works with Integer type. Should we always use Integer as a complex type?

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• language specific virtual keyboard with java

  - by user343285

  Hello everyone! I have to make an on-screen keyboard using JAVA on linux. the problem is it has to work on the most languages. for start, i need to et the current locale, that's clear, but after that, is there any way of getting the keyboard layout and maping of that locale? i searched for hours, but couldn't find a thing, so i really hope you can help me. Thanks in advance, Adam!

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• Java Applet Authentication

  - by user265536

  I have Java Applet(J2EE), I want to make it accessible only to a certain set of users,by authenticating them using username and password.What is the the best way of doing this?

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• Class constructor in java

  - by aladine

  Please advise me the difference between two ways of declaration of java constructor public class A{ private static A instance = new A(); public static A getInstance() { return instance; } public static void main(String[] args) { A a= A.getInstance(); } } AND public class B{ public B(){}; public static void main(String[] args) { B b= new B(); } } Thanks

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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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