How to use Struts 2 with JFreeChart?

[Peter Mest]

0 vote down star


Firstly, I went here ( http://code.google.com/p/struts2-examples/downloads/list and I downloaded Hello_World_Struts2_Mvn.zip) and I run that example.

After that, I went here (http://struts.apache.org/2.x/docs/jfreechart-plugin.html), I add the dependencies for commons-lang-2.5.jar, jcommon-1.0.16.jar and jfreechart-1.0.13.jar and I modify the example downloaded from code.google.com to see how JFreeChart is working, but I receive this error:

Unable to load configuration. - action - file:/C:/.../untitled_war_exploded/WEB-INF/classes/struts.xml:34:67

Caused by: Error building results for action createChart in namespace  - action - file:/C:/.../out/artifacts/untitled_war_exploded/WEB-INF/classes/struts.xml:34:67

Caused by: There is no result type defined for type 'chart' mapped with name 'success'.  Did you mean 'chart'? - result - file:/C:/.../out/artifacts/untitled_war_exploded/WEB-INF/classes/struts.xml:36:49

At the line 36 in struts.xml is the this code (the code from struts2 website):

<action name="viewModerationChart" class="myapp.actions.ViewModerationChartAction">
  <result name="success" type="chart">
    <param name="width">400</param>
    <param name="height">300</param> 
  </result>
</action>

What I'm doing wrong?

[David Newton]

Are you extending a package that defines the chart result, or defining it yourself?

[Peter Mest]

David Newton wrote:Are you extending a package that defines the chart result, or defining it yourself?

Yes, this was the problem, I didn't put the action in a package which extends the jfreechart-default.

But the problem is not solved... :|

When I pressed the link associated with the action which generates the chart, I receive this error:

Struts Problem Report

Struts has detected an unhandled exception:
# Messages: 	There is no Action mapped for namespace / and action name raport.
Stacktraces
There is no Action mapped for namespace / and action name raport. - [unknown location]

My struts.xml file:

<struts>
	<constant name="struts.devMode" value="true" />
	<package name="basicstruts2" extends="struts-default">
	<!--
		My regular actions
	-->
	</package>

	<!--
		The Jfreechart package
	-->

	<package name="struts2" extends="jfreechart-default">
		<action name="raport" class="actions.Raports">
			<result name="success" type="chart">
				<param name="height">600</param>
				<param name="width">800</param>
			</result>
		</action>
	</package>
</struts>

[David Newton]

No, the problem was solved--you just have a different problem now :)

Make sure devMode is turned on, possibly set your log level to DEBUG, check the log for errors on startup, and when you hit the action.

What libraries are you deploying?

[Peter Mest]

commons-lang-2.5.jar -> This is for the example on the webpage
jcommon-1.0.16.jar
jfreechart-1.0.13.jar
struts2-jfreechart-plugin-2.1.8.1.jar -> This I forgot to add first time.

Now, in Eclipse I receive this exception

java.lang.ClassNotFoundException: org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter

I think I you'll give up solving this problem... using Eclipse :). I just imported the project in IDEA (without doing anything else) and the chart is working :banghead: .

[David Newton]

Without knowing how you were handling Maven dependencies in Eclipse, or how you were running/testing/etc. it'll be tough to help--but glad it works somewhere.