This is a known problem. There are plans to fix it in the
works. Currently there are two options:
1) Connect to any X server,by setting your display variable
in CSH you could do 'setenv DISPLAY localhost:0.0' to connect to
the local X server, or however you set your environment variables
in your environment. You may also have to do a xhost +hostname if
the hostname is not local. (NOTE: You don't have to connect to the
*local* X server though, you can connect to any X server.)
2) If you aren't running X on any nearby servers, you can install
xvfb, the virtual frame buffer. You can find a good primer on
getting this it at http://tmap.pmel.noaa.gov/home/ferret/FAQ/graphics/Xvfb.html.
Paul
> Hi,
>
> We are also getting the same problem. Our X Windows server is running. We
> are using NES and Servlet Exec. Please tell me how to set the DISPLAY
> variable and where. Is it in the start script for NES.
>
> Thanx in advance,
> Bhuvana..
>
> > ----------
> > From: Loni & Bharat Nagwani[SMTP:[EMAIL PROTECTED]]
> > Reply To: A mailing list about Java Server Pages specification and
> > reference
> > Sent: Sunday, December 03, 2000 3:23 AM
> > To: [EMAIL PROTECTED]
> > Subject: Re: draw image
> >
> > You have to run X Windows on the server for this to work. Also in your
> > appserver startup file you have to set DISPLAY variable. If you need more
> > details send me an email and I will dig out the details tommorow.
> >
> > ----- Original Message -----
> > From: Ching sen, Jackson <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Sunday, November 26, 2000 4:29 AM
> > Subject: draw image
> >
> >
> > > hi all,
> > >
> > > I copy this draw image servlet from a book
> > >
> > > import java.io.*;
> > > import java.awt.*;
> > > import javax.servlet.*;
> > > import javax.servlet.http.*;
> > >
> > > import Acme.JPM.Encoders.GifEncoder;
> > >
> > > public class HelloWorldGraphics extends HttpServlet {
> > >
> > > public void doGet(HttpServletRequest req, HttpServletResponse res)
> > > throws ServletException, IOException {
> > > ServletOutputStream out = res.getOutputStream(); // binary output!
> > >
> > > Frame frame = null;
> > > Graphics g = null;
> > >
> > > try {
> > > // Create an unshown frame
> > > frame = new Frame();
> > > frame.addNotify();
> > >
> > > // Get a graphics region, using the Frame
> > > Image image = frame.createImage(400, 60);
> > > g = image.getGraphics();
> > >
> > > // Draw "Hello World!" to the off screen graphics context
> > > g.setFont(new Font("Serif", Font.ITALIC, 48));
> > > g.drawString("Hello World!", 10, 50);
> > >
> > > // Encode the off screen image into a GIF and send it to the
> > client
> > > res.setContentType("image/gif");
> > > GifEncoder encoder = new GifEncoder(image, out);
> > > encoder.encode();
> > > }
> > > finally {
> > > // Clean up resources
> > > if (g != null) g.dispose();
> > > if (frame != null) frame.removeNotify();
> > > }
> > > }
> > > }
> > >
> > > but I got this error message, pls tell me how to fix it.
> > >
> > > java.lang.InternalError: Can't connect to X11 window server using ':0.0'
> > as the value of the DISPLAY variable.
> > > at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
> > > at sun.awt.X11GraphicsEnvironment.(X11GraphicsEnvironment.java:58)
> > > at java.lang.Class.forName0(Native Method)
> > > at java.lang.Class.forName(Class.java:120)
> > > at
> > java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironme
> > nt
> > .java:59)
> > > at sun.awt.motif.MToolkit.(MToolkit.java:56)
> > > at java.lang.Class.forName0(Native Method)
> > > at java.lang.Class.forName(Class.java:120)
> > > at java.awt.Toolkit$2.run(Toolkit.java:495)
> > > at java.security.AccessController.doPrivileged(Native Method)
> > > at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:488)
> > > at java.awt.Window.getToolkit(Window.java:416)
> > > at java.awt.Frame.addNotify(Frame.java:270)
> > > at HelloWorldGraphics.doGet(HelloWorldGraphics.java:20)
> > > at javax.servlet.http.HttpServlet.service(HttpServlet.java:715)
> > > at javax.servlet.http.HttpServlet.service(HttpServlet.java:840)
> > > at
> > com.sun.web.core.ServletWrapper.handleRequest(ServletWrapper.java:155)
> > > at com.sun.web.core.InvokerServlet.service(InvokerServlet.java:168)
> > > at javax.servlet.http.HttpServlet.service(HttpServlet.java:840)
> > > at
> > com.sun.web.core.ServletWrapper.handleRequest(ServletWrapper.java:155)
> > > at com.sun.web.core.Context.handleRequest(Context.java:414)
> > > at com.sun.web.server.ConnectionHandler.run(ConnectionHandler.java:139)
> > >
> > >
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> >
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> >
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> > http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
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> >
>
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> For digest: mailto [EMAIL PROTECTED] with body: "set JSP-INTEREST DIGEST".
> Some relevant FAQs on JSP/Servlets can be found at:
>
> http://java.sun.com/products/jsp/faq.html
> http://www.esperanto.org.nz/jsp/jspfaq.html
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
>
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For digest: mailto [EMAIL PROTECTED] with body: "set JSP-INTEREST DIGEST".
Some relevant FAQs on JSP/Servlets can be found at:
http://java.sun.com/products/jsp/faq.html
http://www.esperanto.org.nz/jsp/jspfaq.html
http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
