Bill Barker wrote:
Running headless means using awt-light. In particular, one of the things you are forbidden from doing is creating heavy-weight components like Frames. If you want to run headless, you will need to re-structure your servlet to only use light-wieght components (that, in particular, don't care that there isn't a mouse).
"Simon Brooke" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] -----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/htform/ 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.java: 195) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39 ) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl .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
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