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• Matrix multiplication in java

  - by Chapax

  Hi, I wanted to do matrix multiplication in Java, and the speed needs to be very good. I was thinking of calling R through java to achieve this. I had a couple of Qs though: Is calling R using Java a good idea? If yes, are there any code samples that can be shared? What are the other ways that can be considered to do matrix multiplication in…

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• Multiple java versions running concurrently under Windows

  - by Daniel Stanca

  We have a couple of applications running on Java 5 and would like now to bring in an application based on Java 6. Can both java versions live together under Windows? Is there any control panel to set the appropiate java version for different applications?

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• Java program grading

  - by pasito15

  I've been working on this program for hours and I can't figure out how to get the program to actually print the grades from the scores Text file public class Assign7{ private double finalScore; private double private_quiz1; private double private_quiz2; private double private_midTerm; private double private_final; private final char…

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• Using custom .jar's in your java project

  - by Aidan

  Hi guys, I'm importing from two jar's twitter4j-2.0.10.jar and mysql-connector-java-5.1.10-bin.jar, I'm running the code on a server but it's not letting me. I get a.. Streamer.java:9: package twitter4j does not exist import twitter4j.StatusDeletionNotice; ^ error when compiling. I know this has something to do with getting…

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• Accessing smart card with Java

  - by Tom Brito

  I'm trying to learn about how does Java access smart cards, due to a project analysis. I wonder if there is any kind of virtual smart card which I could use to make some tests with Java? By the way, I've read about Java Card, and looks like it is used to run Java in cards, not to smart card data access, right?

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• Best online resources for learning Java 6 from Java 4 background?

  - by Chris Knight

  Our company is finally coming out of the dark ages and embracing Java 6. We have been using Java 4 for many years and I'm interested in learning the new features offered by Java 5 and 6. So, can anyone recommend any online resources to help me learn what's new since Java 4?

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• Reconstruction of java command line arguments

  - by notnoop

  Is there a way to reconstruct the command line arguments passed to Java within a Java program, including the JVM options and classpath option? I have a Java program that needs to restart the JVM and manipulate its bootclasspath (i.e. trying to override some system classes). I use the libc system method to invoke the new JVM. I'm open for…

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• Get data back with extension .java

  - by Gogoo

  I delete my java program from java project in eclipse. The extension was .java and I don't know how to get back? I try (getdataback for NTFS) but I didn't get back my *.java file. Some solution?

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• Java: Prepare a statement without a connection

  - by r3zn1k

  I'm trying to generate some sql files in my java application. The application will not execute any sql statements, just generate a file with sql statements and save it. I'd like to use the java.sql.PreparedStatement to create my statements so that i don't have to validate every string etc. with my own methods. Is there a way to use the…

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• class not found expection.

  - by theJava

  org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mySessionFactory' defined in ServletContext resource [/WEB-INF/dispatcher-servlet.xml]: Initialization of bean failed; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert property value of type 'java.util.ArrayList'…

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• Does JUnit4 testclasses require a public no arg constructor?

  - by Thomas Baun

  I have a test class, written in JUnit4 syntax, that can be run in eclipse with the "run as junit test" option without failing. When I run the same test via an ant target I get this error: java.lang.Exception: Test class should have public zero-argument constructor at…

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• Severe Tomcat crash has me stumped

  - by Eric Banderhide

  I'm pretty used to crashing my tomcat server. But I don't think I made any changes at all and seem to have broken it completely. Was working one min then not the next. I really hope someone can help here is the Catalina.out: Dec 20, 2012 1:35:56 AM…

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• GWT - occasional com.google.gwt.user.client.rpc.SerializationException

  - by user214984

  Hello we are haunted by occasional occurences of exceptions such as: com.google.gwt.user.client.rpc.SerializationException: Type 'xxx' was not assignable to 'com.google.gwt.user.client.rpc.IsSerializable' and did not have a custom field…

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• ArrayAdapter and ListView - ArrayIndexOutOfBoundsException

  - by synic

  I'm really hoping someone can help me out with this one. I've been stuck on it forever. Occasionally, when someone is using my app, it'll force close with this exception: java.lang.ArrayIndexOutOfBoundsException at…

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• Error loading WebappClassLoader in Tomcat

  - by Liron Yahdav

  I tried starting Tomcat and deploying my webapp from NetBeans after adding and configuring a new servlet. I got the following in the Tomcat error log: INFO: Marking servlet MyServlet as unavailable SEVERE: Error loading…

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• Make My Own Made Java Based Text editor as default Text Editor in Windows

  - by Rohan Sharma

  I have Made a Text Editor in Java and i want to make it default text editor ,That is like in windows we have notepad as default text whose icon shows on all text files and double clicking those file(s) opens the file(s)…

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• Mac - Run java program at launch

  - by emd

  I want to launch a java program (server program) at computer start up. I can run it from the command line perfectly. I created /Library/Server/startFS.sh. The file is executable by root and contains: cd…

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• How to copy text from Java program?

  - by Mohd. Ismail

  I am using one Java program called JDownloader v0.9.581 and want to copy full file and link list from main scrolling window. JDownloader is not having any way to save full list as text file. I am already…

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• Unable to start tomcat6: Java error (Exception in thread "main")

  - by Nyxynyx

  After installing tomcat6 on CentOS 6.3, I am unable to start tomcat6 server. root@host [/var/log/tomcat6]# service tomcat6 start Starting tomcat6: [ OK ] …

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• shell script to start multiple Java programs from a directory at boot

  - by zcourts

  I'm not sure if this is the best approach to this, It's my first time doing all of this (including writing shell scripts). OS: Centos My problem: I want to start multiple shell scripts at boot. One…

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• Jenkins slave jobs failing on "Unexpected termination of channel"

  - by Clark Wright

  I am currently seeing a set of errors across my builds. Is this expected behaviour if you loose Jenkins (say to a box crash, or a kill -9)? Or is there something worse going on (like a bad network…

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• Java support for Linux Google Chrome?

  - by jldupont

  Is there a way to run Linux Google Chrome with Java support?

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• How does java permgen relate to code size

  - by brad

  I've been reading a lot about java memory management, garbage collecting et al and I'm trying to find the best settings for my limited memory (1.7g on a small ec2 instance) I'm wondering if there…

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• spymemcached (Java Memcached Client)

  - by Java Guy

  Is there a way to collect the memcached stats using this API (spymemcached)? I know there are tools like cacti to collect information on Memcached Server. But I would like to collect, say, memory…

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• problem with iterate over java.util.Map using "JSF" OR JSTL TAGS

  - by New-To-Java

  I'm using Richfaces jsf and I want to iterate over an Map<Object,Object>. I see many examples on sun forums and other sites but in my case it doesn't work ! here is my xhtml code : …

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