{Spam?} Re: BufferedImage.createGraphics() from a servlet

[Roberto Nunnari]

Ciao Franco.

Thank you very much for your hints. I'll try probably this evening
and will let you know if it works.


Franco Bruno Borghesi wrote:
> I had the same problem a few months ago. I remember I defined this
> 
> export JAVA_OPTS="-Djava.awt.headless=true"
> 
> on my tomcat startup script. I also remember that I had to instal 
> XFree86-libraries on my server, and recompile/reinstall jdk-14.
> 
> This way you don't need to run X on the server, you just need the 
> libraries.
> Hope this helps.
> 
> 
> Roberto Nunnari wrote:
> 
>> Sorry.. forgot to mention the errors..
>> the servlet stacktrace when running xdm from /etc/ttys is:
>>
>> java.lang.NoClassDefFoundError
>>     at java.lang.Class.forName0(Native Method)
>>     at java.lang.Class.forName(Class.java:141)
>>     at 
>> java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:62) 
>>
>>     at 
>> java.awt.image.BufferedImage.createGraphics(BufferedImage.java:1041)
>>     at ch.nunnisoft.webcounter.Counter.processRequest(Counter.java:103)
>>     at ch.nunnisoft.webcounter.Counter.doGet(Counter.java:156)
>>     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
>>     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
>>     at 
>> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247) 
>>
>>     at 
>> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) 
>>
>>     at 
>> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256) 
>>
>>     at 
>> org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) 
>>
>>     at 
>> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) 
>>
>>     at 
>> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
>>     at 
>> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) 
>>
>>     at 
>> org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) 
>>
>>     at 
>> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) 
>>
>>     at 
>> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
>>     at 
>> org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2422) 
>>
>>     at 
>> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180) 
>>
>>     at 
>> org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) 
>>
>>     at 
>> org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171) 
>>
>>     at 
>> org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641) 
>>
>>     at 
>> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:163) 
>>
>>     at 
>> org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641) 
>>
>>     at 
>> org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:577)
>>     at 
>> org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641) 
>>
>>     at 
>> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) 
>>
>>     at 
>> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
>>     at 
>> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174) 
>>
>>     at 
>> org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) 
>>
>>     at 
>> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) 
>>
>>     at 
>> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
>>     at 
>> org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:199)
>>     at 
>> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:828) 
>>
>>     at 
>> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:700) 
>>
>>     at 
>> org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:584) 
>>
>>     at 
>> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683) 
>>
>>     at java.lang.Thread.run(Thread.java:534)
>>
>>
>> Roberto Nunnari wrote:
>>
>>> Hi all.
>>>
>>> I'm having trouble running a simple servlet that does the
>>> following:
>>>
>>> BufferedImage image = new BufferedImage(100, 20, 
>>> BufferedImage.TYPE_3BYTE_BGR);
>>> Graphics2D g = image.createGraphics();
>>>
>>> This are the facts:
>>>
>>> -bash-2.05b# uname -a
>>> FreeBSD jupiter.noonlights.net 5.2.1-RELEASE-p9 FreeBSD 
>>> 5.2.1-RELEASE-p9 #3: Sat Aug 14 06:30:22 CEST 2004 
>>> root at jupiter.noonlights.net:/usr/obj/usr/src/sys/JUPITER  i386
>>>
>>> -bash-2.05b# XFree86 -version
>>> XFree86 Version 4.3.0
>>> ...
>>>
>>> -bash-2.05b# java -version
>>> java version "1.4.2-p6"
>>> Java(TM) 2 Runtime Environment, Standard Edition (build 
>>> 1.4.2-p6-root_09_aug_2004_03_45)
>>> Java HotSpot(TM) Client VM (build 1.4.2-p6-root_09_aug_2004_03_45, 
>>> mixed mode)
>>>
>>> -bash-2.05b# pkg_info |grep wrapper
>>> javavmwrapper-1.4   Wrapper script for various Java Virtual Machines
>>> wrapper-1.0_3       Wrapper for XFree86-4 server
>>>
>>> note that I don't have a monitor attached, but the server
>>> is running..
>>>
>>> -bash-2.05b$ startx -listen_tcp &
>>>
>>> -bash-2.05b$ xhost +
>>>
>>> .. if I enable xdm in /etc/ttys then I get connection refused
>>> messages from the Xserver..
>>>
>>> can any kind soul help me out?
>>>
>>> Thank you.
>>
>>
>>
>>


-- 
               Roberto Nunnari -software engineer-
                mailto:roberto.nunnari at supsi.ch
  Scuola Universitaria Professionale della Svizzera Italiana
              Dipartimento Tecnologie Innovative
                   http://www.dti.supsi.ch
  SUPSI-DTI
  Via Cantonale                        tel: +41-91-6108561
  6928 Manno                 """       fax: +41-91-6108570
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