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Re: [fedora-java] Graph APIs does not work on Linux Server.



On 09/14/2009 01:10 AM, sj david wrote:
Hi Fedora,

Hello David
...

      I Setup the Eclipse IDE & Tomcat server on Fedora 9. I am facing
following problems while enabling graphical APIs on the application:
*1*. I have a running java application with JCharts on Windows which
works fine with Eclipse & Tomcat server. But when I am  trying to deploy
the same on Fedora 9. JCharts are not able to render & I am getting the
following error:
     : "/*Gtk Warning: cannot open display*/".

First, it is time to move from Fedora 9, it is not supported anymore :-)

Now the problem could be that the Tomcat server is running under a user with no access to the display and that is the correct way to install it. JFreeChart uses a lot Java2D, that until Java 1.4 required to have access to a display (in Linux a X Server), but Sun introduced a in 1.4 the System property java.awt.headless that make it possible to use Java2D and many other graphic related classes/methods.

You need to add the argument -Djava.awt.headless=true to the script that start Tomcat, when calling the java executable

If I disable the call to JCharts APIs, My application works fine. Can
you please help me here.

*2*. To overcome this issue, I move to another Chart API: JFreeCharts. I
added the jar in the classpath & also added its java files in the
project, but whenever I am running my application from Eclipse with
Tomcat, Tomcat is not able to  load this JFreeChart class files, saying :

*java.lang.NoClassDefFoundError*

. Please help me here.


Thanks
David.


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