PJSJava

I've used this setup for my development environment for several years - giving me a developer desktop I can access anywhere. Even from my mobile phone. I've been fixing bugs, writing code and deployed emergency fixes from the bus, train and mountain tops. The setup is based on a lightweight desktop environment. There are lot of alternatives, but I've chosen fluxbox. From a plain AWS Amazon Ubuntu 16.04 ec2 instance I've started like this: sudo apt-get update sudo apt-get install fluxbox Download and extract tigervnc from https://github.com/TigerVNC/tigervnc/releases (I downloaded the binary file from https://bintray.com/tigervnc/stable/tigervnc/1.7.0 named tigervnc-1.7.0.x86_64.tar.gz ) then extract: tar -xvzf tigervnc-1.7.0.x86_64.tar.gz You need to install: sudo apt-get install x11-xkb-utils You need to edit .vnc/xstartup: nano .vnc/xstartup last line replace "twm &" with: fluxbox & Then you can start the...

This may happen every now and then if you killed the appserver and JMS was left in locked state. You can try to resolve it by deleting the file glassfish4/glassfish/domains/domain1/imq/instances/imqbroker/lock.

Just made an example of how to transfer a file over a secure and authenticated connection in pure Java - without having to use additional technology like ssh/scp. Versile has all you need for creating a secure and authenticated connection, and you'll decide what files you want to expose - nothing more - nothing less. This is the file server (include versile.jar in your classpath - and create a file called "personregister.txt" in the working directory): package versileexample; import java.io.File; import java.io.FileNotFoundException; import java.io.RandomAccessFile; import java.security.interfaces.RSAPublicKey; import java.util.logging.Level; import java.util.logging.Logger; import org.versile.Versile; import org.versile.common.auth.VAuth; import org.versile.common.auth.VCredentials; import org.versile.common.auth.VPrivateCredentials; import org.versile.common.peer.VInetSocketPeer; import org.versile.common.peer.VPeer; import o...

A simple function useful to plot a logarithmic scale. Just provide it with the min and max values of the scale and the value you want to convert - and you'll get in return a value as it should be positioned on a logarithmic scale in the given range. public double toLogScale(double min, double max,double val) { double logmin = Math.log(min); double logmax = Math.log(max); double logscale = (Math.log(val)-logmin) / (logmax-logmin); return min+(max-min)*logscale; }

To create a Ubuntu desktop on Amazon EC2 that can be accessed by VNC I did the following steps: 1. Create 64-bit Ubuntu server instance 2. Install ubuntu desktop: sudo apt-get install ubuntu-desktop 3. Install x11vnc sudo apt-get install x11vnc 4. Install xvfb sudo apt-get install xvfb 5. Configure x11vnc sudo nano /etc/init/x11vnc.conf start on login-session-start script /usr/bin/x11vnc -xkb -auth /var/run/lightdm/root/:0 -noxrecord -noxfixes -noxdamage -rfbauth /etc/x11vnc.pass -forever -bg -rfbport 5900 -o /var/log/x11vnc.log end script And you should also set a password for your vnc sessions: sudo x11vnc -storepasswd /etc/x11vnc.pass 6. Configure X server to use xvfb: (Add the xserver-command line) sudo nano /etc/lightdm/lightdm.conf [SeatDefaults] greeter-session=unity-greeter user-session=ubuntu xserver-command=/etc/X11/xinit/xserverrc (Replace the exec line) sudo nano /etc/X11/xinit/xserverrc #!/bin/sh #exec /us...

This is a simple method of creating an Excel export function on your Kendo UI grid with a Java EE server. JS function to trigger Excel export In your web-page with the grid - insert this JS function. You should create a button or similar that calls this when you want to perform the export from the UI. function exportGridToExcel() { var grid = $("#grid").data("kendoGrid"); var currentPage = grid.dataSource.page(); var allPages = new Array(); for(var n=1;n<=grid.dataSource.totalPages();n++) { grid.dataSource.page(n); var view = grid.dataSource.view(); for(var x=0;x<view.length;x++) { allPages.push(view[x]); } } $("#excelExportGridData").val(JSON.stringify({"rows": allPages, "cols": grid.columns})); $("#exportToExcelForm").submit(); grid.dataSource.page(currentPage); } Hidden form and iframe You also nee...

Before you continue - check out the demonstration video: The demonstration uses RoboVM to build an IOS app (written in Java), and Versile  to create a server and provide communication between the app and server. Details of configuring Versile and RoboVM are not described here. Go to RoboVM website, and check my earlier Versile blog posts for more info. The source for the IOS app is based on the RoboVM example: import java.util.Date; import org.robovm.cocoatouch.coregraphics.*; import org.robovm.cocoatouch.foundation.*; import org.robovm.cocoatouch.uikit.*; import org.robovm.objc.block.VoidBlock; import org.robovm.rt.bro.Bro; import org.robovm.rt.bro.NativeObject; import org.robovm.rt.bro.annotation.Bridge; import org.robovm.rt.bro.annotation.Library; import org.versile.Versile; import org.versile.orb.entity.VProxy; import org.versile.reactor.url.VUrl; import org.versile.vse.VSEResolver; import org.versile.vse.util.VFunction; public class VersileRoboVM...