I use -Djava.awt.headless=true to create graphs on the fly and never get this exception.
-----Original Message----- From: Simon Brooke [mailto:[EMAIL PROTECTED] Sent: Monday, September 08, 2003 1:48 PM To: Tomcat Users List Subject: HeadlessException: The chickens come home to roost! -----BEGIN PGP SIGNED MESSAGE----- Long, long ago I spent a lot of time writing a Servlet which allowed drill-through graphs and charts to be built on the fly, server side. I was very proud of it, but getting it working on an X11 platform was such a bloody swine that I actually documented how to do it here: <URL:http://www.weft.co.uk/library/jacquard/documentation/uk/co/weft/htf orm/Graphic.html> Now I need to use this functionality in a new project, and can I get it to work? No, I *&*%$ can't. And the problem is a new one: java.awt.HeadlessException I get this whether or not I have CATALINA_OPTS="-Djava.awt.headless=true" defined in /etc/default/tomcat4, and whether or not I have Xvfb running, with the DISPLAY environment variable pointing in the right place, and all X security off. Specifically I get: java.awt.HeadlessException at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:121) at java.awt.Window.(Window.java:266) at java.awt.Frame.(Frame.java:398) at java.awt.Frame.(Frame.java:363) at uk.co.weft.htform.MappedImage.(MappedImage.java:156) at uk.co.weft.htform.ExampleMappedImage.(ExampleMappedImageServlet.java:28) which is to say when I first try to create a java.awt.Frame I'm using tomcat 4.0.4 as packaged in Debian package tomcat4_4.0.4-4 on Debian 3.0 with Sun Java 1.4.0 and Sun Java 1.4.1; I also have, and could try if people think it would help, IBM Java 1.3.0 The last time this issue was discussed on this list was on 20th March this year; I've tried all the proposed solutions which were discussed at that time, including the eTeks PJA toolkit, which sounds a very clever solution but which unfortunately failed with a NullPointerException java.lang.NullPointerException at com.eteks.awt.servlet.PJARedirectServlet.servicePJA(PJARedirectServlet.j ava:195) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav a:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor Impl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at com.eteks.awt.servlet.PJAServlet.HttpMethodInvoke(PJAServlet.java:793) at com.eteks.awt.servlet.PJAServlet.service(PJAServlet.java:775) Any further suggestions gratefully received. Simon - -- [EMAIL PROTECTED] (Simon Brooke) http://www.jasmine.org.uk/~simon/ ;; MS Windows: A thirty-two bit extension ... to a sixteen bit ;; patch to an eight bit operating system originally coded for a ;; four bit microprocessor and sold by a two-bit company that ;; can't stand one bit of competition -- anonymous -----BEGIN PGP SIGNATURE----- Version: 2.6.3ia Charset: noconv iQCVAwUBP1zdAHr1UrYJMbiJAQHSUAP/RoR0DwfzilZ3EySyin3kXFzPkLQopTM9 l1yHrFdLnFFW6MV9rIuoKxNS2U1vPJ9zlqfeJt8hJszKKYO3b5WII6IJ0sz3fOIL YaItN0wTGmgpDtOMSFHsv4hXrzHBVdzNXYuQaJ6Fo/alKcRMGdfKliYzNAR3PaeH zlgRCXecWio= =z/Pq -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
