Of course we would love a Struts2 - JFreeChart tutorial!!! Please do...
David M.
VJ22 wrote:
Thanks Dusty....
I finally get this working and how....I was re-initializing the chart in my
execute() method after declaring it as a private variable...DUH DUH DUH
!!!!!!
DO let me know if anyone else would be interested in a small tutorial on
using the new plug-in of struts 2 ....I would be more than glad to help
As always thanks guys...
Tks...VJ
dusty wrote:
What is the JFreeChart code in your action that creates the chart.
Perhaps you have a problem there and the chart is not getting created or
the variable is not getting populated?
VJ22 wrote:
Yes...exactly...
We are using the standardized one...unfortunately....we are not able to
retrieve the chart of the value stack....that is why the error....
Tks....VJ
dusty wrote:
Here are some JFreeChart results used in WebWork (Struts2's parent).
http://www.opensymphony.com/webwork/wikidocs/JFreeChartResult.html
It looks like in Struts they have formalized the JFreeChart result type:
http://struts.apache.org/2.x/struts2-plugins/struts2-jfreechart-plugin/apidocs/index.html
VJ22 wrote:
Thanks Matt/David,
I presume that by a servlet class you mean you flush the PNG file onto
the output stream which is then rendered by the JSP....We are aware of
that solution....
What we intend to use is the pull-MVC mechanism of Struts2...which
helps us use the getChart() method to render the chart
Tks...Vijay
J. David Mendoza R. wrote:
Hello Vijay...
I'm using appfuse 1.9.4, spring and jfreechart, and what I did is, I
made a servlet that uses jfreechart's tools to generate the chart as a
PNG image and just present it within the JSP... This should work with
any web framework...
David M.
VJ22 wrote:
Hello All,
The problem that I face while integrating AppFuse with JFreeChart
So I have a link which points to viewChart.html configured from the
menu..When I click on this link I got an action class which populates
the
chart (Unit-tests prove that the png file is generated
fine)...re-directs it
to viewChart.jsp which has got the following image code
<image src="/viewChart.html"/> -> which I presume will get the chart
from
the action
The problem exception happens when it tries to execute the getChart()
method...in the action class....A part of the stack-trace is attached
here
java.lang.NullPointerException: No chart found
at
org.apache.struts2.dispatcher.ChartResult.execute(ChartResult.java:105)
at
com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvo
cation.java:343)
So I assume that the chart object is being invalidated....but why ? I
assume
this uses a pull-MVC architecture...any help would be gladly
appreciated.....
struts.xml configuration
<package name="chart" extends="jfreechart-default">
<action name="viewChart"
class="com.pwmliteexp1.pwmLitexp1.web.action.PWMLitePieChartAction"
scope="session">
<result name="success"
type="chart">/WEB-INF/pages/viewChart.jsp</result>
</action>
</package>
Thanks in advance
Rgds....Vijay
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