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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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