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• How can I create a PFX file from a Java Keystore?

  - by Christian Berg

  I have a Java keystore (.jks file) holding a single certificate. How can I create a .pfx file from this keystore?

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• How to obtain position in file (byte-position) from java scanner?

  - by september2010

  How to obtain a position in file (byte-position) from the java scanner? Scanner scanner = new Scanner(new File("file")); scanner.useDelimiter("abc"); scanner.hasNext(); String result = scanner.next(); and now: how to get the position of result in file (in bytes)? Using scanner.match().start() is not the answer, because it gives the position within internal buffer.

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• Google App Engine - "java.lang.IllegalArgumentException: datastore transaction or write too big."

  - by Keyur

  When calling DatastoreService.delete(keys) with 400 keys, I'm get this exception: java.lang.IllegalArgumentException: datastore transaction or write too big. I thought the limit on batch deletes was 500 so I am well under the limit. Am I missing something here? Thanks, Keyur

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• How do I programmatically determine operating system in Java?

  - by KG

  I would like to determine the operating system of the host that my Java program is running programmatically (for example: I would like to be able to load different properties based on whether I am on a Windows or Unix platform). What is the safest way to do this with 100% reliability?

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• Is it possible to specify both upper and lower bound constraints on type parameters in Java?

  - by Hosam Aly

  Is it possible to specify both upper and lower bound constraints on type parameters in Java? I found a conversation in Sun's forum in which this issue was discussed (apparently before the generics feature was finalized), but there was no final answer. In summary, is there a valid syntax to do this: public class MyClass<T extends Number super Integer> ?

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• Is there a library for Linear algebra matrix handling in Java?

  - by Mario Ortegón

  Is there any libraries in java that allow using mathematical matrices? I am looking for a library that allows me to perform operations in matrices such as invert, scalar multiplication, linear transformations, etc. etc. etc. In a nutshell, the operations required for lineal algebra.

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• what are good blogs to read relating java, spring, hibernate, maven?

  - by c0mrade

  To continue to question further I'm more interested in blogs, websites who once in a while release a tutorial, tip or best-practice on the topics I mentioned. For ex : http://net.tutsplus.com/ is very good website to follow if you wanna learn about or upgrade your knowledge about CSS, HTML, Javascript, PHP .. Is there a website like this for Java and related technologies?

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• How to tell Java SAX Parser to ignore invalid character references?

  - by Epaga

  When trying to parse incorrect XML with a character reference such as &#x1, Java's SAX Parser dies a horrible death with a fatal error such as org.xml.sax.SAXParseException: Character reference "&#x1" is an invalid XML character. Is there any way around this? Will I have to clean up the XML file before I hand it off to the SAX Parser? If so, is there an elegant way of going about this?

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• How to ignore expired certificates from outside a Java application?

  - by Creepy Gnome

  We have a Java application that we need to ignore an expired self-signed cert, however we cannot modify the code to do this. I wondering if there was a System Property or environment variable that we could provide at start up that would allow us to have all expired cert's ignored for now, or even be more specific and provide externally the specific cert that we would like to have the expiration ignored. Anyone have any ideas that would work?

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• What exactly is RTSJ, the Real-Time Specification for Java?

  - 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 a Java (Sun/Oracle) equivalent of the Microsoft MVP Program?

  - by JohnAOwens

  We already run a NFR (not for resale) program where we give Microsoft MVP's a reduced cost licence of our software. We would like to extend this to the Java community, but I'm having trouble finding the equivalent program in the Sun/Oracle world. Is there such a thing?

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• To use AES with 256 bits in inbuild java 1.4 api.

  - by sahil garg

  I am able to encrypt with AES 128 but with more key length it fails. code using AES 128 is as below. import java.security.*; import javax.crypto.*; import javax.crypto.spec.*; import java.io.*; /** * This program generates a AES key, retrieves its raw bytes, and * then reinstantiates a AES key from the key bytes. * The reinstantiated key is used to initialize a AES cipher for * encryption and decryption. */ public class AES { /** * Turns array of bytes into string * * @param buf Array of bytes to convert to hex string * @return Generated hex string */ public static String asHex (byte buf[]) { StringBuffer strbuf = new StringBuffer(buf.length * 2); int i; for (i = 0; i < buf.length; i++) { if (((int) buf[i] & 0xff) < 0x10) strbuf.append("0"); strbuf.append(Long.toString((int) buf[i] & 0xff, 16)); } return strbuf.toString(); } public static void main(String[] args) throws Exception { String message="This is just an example"; // Get the KeyGenerator KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(128); // 192 and 256 bits may not be available // Generate the secret key specs. SecretKey skey = kgen.generateKey(); byte[] raw = skey.getEncoded(); SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); // Instantiate the cipher Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, skeySpec); byte[] encrypted =cipher.doFinal("welcome".getBytes()); System.out.println("encrypted string: " + asHex(encrypted)); cipher.init(Cipher.DECRYPT_MODE, skeySpec); byte[] original = cipher.doFinal(encrypted); String originalString = new String(original); System.out.println("Original string: " + originalString + " " + asHex(original)); } }

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• What kind of OCR java library should i use in Android?

  - by systempuntoout

  I would like to build an app that OCR a pictures and get text from them. What java library should i use?

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• .NET Client with Java WebService - "(501) Method OST is not defined in RFC 2068 and is not supporte

  - by Yon

  Hi, We've got a .NET client calling a Java WebService hosted on Glassfish. Sometimes, for no clear reason, we get the error stated above. It appears that the first letter of the method ("P" of "POST") is dropped somehow. This is not consistent though, so we have no idea how to reproduce it. The communication is done over SSL. Any ideas? Thanks, yonadav

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• Best book/ tutorial to learn/implement web services using java, xml and spring.

  - by Ankush

  Hi, I am a newbie to web-services. What is a good way to learn web-services implementation using java, xml and spring? Are there any good books which cover this topic in good width? Or, are there any online resources, tutorials, etc.? Also, what would be good projects to understand this hands-on? Any recommendations?

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• java: how can i set the compatibility mode of a native .exe?

  - by Jakob

  So i have a native executable (both for OS X and Windows) tucked inside a .jar, which is then programatically extracted to a temp location and executed from there. Unfortunately this executable will not run properly on my Windows machine (Win 7 64bit), when i manually set the compatibility mode to a Windows XP preset however, it will work. Is there a way i can do this programatically from Java?

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• Is a Java static block equivalent to a C3 static constructor?

  - by Mackenzie

  What is the real difference between a C# static constructor and a Java static block? They both must be parameterless. They are both called only once, when the related class is first used. Am I missing something, or are they the same thing, just with different names?

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• Can I put java code inside the .jrxml (jasperreport)?

  - by spderosso

  Hi, Can I put java code inside the .jrxml? For example, I want to put an if() or a "new ..()" Is it possible? How? Thanks

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• How to increment a java String through all the possibilities?

  - by dacracot

  I need to increment a String in java from "aaaaaaaa" to "aaaaaab" to "aaaaaac" up through the alphabet, then eventually to "aaaaaaba" to "aaaaaabb" etc. etc. Is there a trick for this?

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• Most idiomatic way to print a time difference in Java?

  - by Zombies

  I'm familiar with printing time difference in milliseconds: long time = System.currentTimeMillis(); //do something that takes some time... long completedIn = System.currentTimeMillis() - time(); But, is there a nice way print a complete time in a specified format (eg: HH:MM:SS) either using Apache Commons or even the dreaded platform API's Date/Time objects? In other words, what is the shortest, simplest, no nonsense way to write this in Java?

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• how to remove the <br/> using regex in java?

  - by androidbase Praveen

  how to get value without <br/> tag using regex n java? my String is: <Div> West Newton, MA 02465 <br/>USA </Div> output should be like: West Newton, MA 02465 USA How?

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• How to determine if a List is sorted in Java?

  - by FarmBoy

  I would like a method that takes a List<T> where T implements Comparable and returns true or false depending on whether the list is sorted or not. What is the best way to implement this in Java? It's obvious that generics and wildcards are meant to be able to handle such things easily, but I'm getting all tangled up. It would also be nice to have an analogous method to check if the list is in reverse order.

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• How to detect and replace non-printable characters in a string using Java ?

  - by Frank

  For instance I have a string like this : abc123[*]xyz[#]098[~]f9e [*] , [#] and [~] represents 3 different non-printable characters. How can I replace them with "X" in Java ? Frank

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• Java Google App Engine Datastore: 'IN' operator available on JDO query filters, as with Python?

  - by Jim Blackler

  This page describes an 'IN' operator that can be used in GAE Datastore to compare a field against a list of possible matches, not just a single value: However this is for Python. In Java (App Engine 1.2.5), trying query.setFilter("someField IN param"); on my javax.jdo.query fires a JDOUserException 'Portion of expression could not be parsed: IN param'. Is there a way this can be done?

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• What is the difference between serialization and synchronization in java?

  - by androidbase Praveen

  What is the difference between serialization and synchronization in java? I need an explanation or a tutorial.

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