I am using a Raspberry Pi 2 model with Debian as the OS.I tried a simple java swing program that opens a JFrame on it, and it worked fine.Later, I wanted to use my Pi headlessly i.e. without connecting Display, keyboard and mouse. So I connected to it using the Ethernet port. I installed the tight VNC server on the Pi and the VNC viewer client on my desktop PC.I was able to view and operate the Pi's desktop from my PC, but when I tried to run the same Java swing program, it exited giving out Java Headless exception and sometimes an authentication error. After searching on the Internet I tried some export DISPLAY commands, but no use.I understand that I need to set some parameters, either relating to the JRE or the operating system.Below is the stackpi@raspberrypi:~/prog $ sudo java HelloSwingClient is not authorized to connect to ServerException in thread main java.awt.AWTError: Can't connect to X11 window server using ':1.0' as the value of the DISPLAY variable.at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)at sun.awt.X11GraphicsEnvironment.access$200(X11GraphicsEnvironment.java:65)at sun.awt.X11GraphicsEnvironment$1.run(X11GraphicsEnvironment.java:115)at java.security.AccessController.doPrivileged(Native Method)at sun.awt.X11GraphicsEnvironment.(X11GraphicsEnvironment.java:74)at java.lang.Class.forName0(Native Method)at java.lang.Class.forName(Class.java:259)at java.awt.GraphicsEnvironment.createGE(GraphicsEnvironment.java:102)at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:81)at java.awt.Window.initGC(Window.java:475)at java.awt.Window.init(Window.java:495)at java.awt.Window.(Window.java:537)at java.awt.Frame.(Frame.java:420)at javax.swing.JFrame.(JFrame.java:225)at HelloSwing.main(HelloSwing.java:6)
Not Able to run simple Java Swing Program on Raspbian on Raspberry Pi 2 Headless connected using tight VNC
java;vnc