Problem with servlet utilities

[eels06]

hello everybody,

i'm a new jfreechart user, i'm tring to save charts using ServletUtilities class.

Here is my code :

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try {
   result = ServletUtilities.saveChartAsJPEG(chart, WIDTH, HEIGHT, session);
   result = "./DisplayChart?filename=" + result ;
   LOG.debug("chart sauvé à l'adresse : "+result) ;
} catch (IOException e) {...}

and i have this stack trace :

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16:16:11,657 - ERROR org.apache.catalina.core.ContainerBase.[jonas].[localhost].[/Pangoo-Web].[action] [http-9000-Processor25] - Servlet.service() for servlet action threw exception
java.lang.IllegalArgumentException: setAttribute: Non-serializable attribute
	at org.apache.catalina.session.StandardSession.setAttribute(StandardSession.java:1251)
	at org.apache.catalina.session.StandardSessionFacade.setAttribute(StandardSessionFacade.java:129)
	at org.jfree.chart.servlet.ServletUtilities.registerChartForDeletion(ServletUtilities.java:310)
	at org.jfree.chart.servlet.ServletUtilities.saveChartAsJPEG(ServletUtilities.java:264)
	at com.orange.pangoo.chart.ChartBuilder.buildLastMeasureChart(ChartBuilder.java:136)
	at com.orange.pangoo.chart.ChartBuilder.buildLastMeasureChart(ChartBuilder.java:89)
	at com.orange.pangoo.action.chart.LastGraphAction.execute(LastGraphAction.java:85)
	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:413)
	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:225)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1858)
	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:446)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
	at sun.reflect.GeneratedMethodAccessor205.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
	at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:275)
	at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:245)
	at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:50)
	at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:156)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:152)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
	at org.objectweb.jonas.web.catalina55.ResetAuthenticationValve.invoke(ResetAuthenticationValve.java:62)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
	at java.lang.Thread.run(Thread.java:595)

This line throws the exception :

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result = ServletUtilities.saveChartAsJPEG(chart, WIDTH, HEIGHT, session);

When i don't use the session parameter it works (but the chart is marked as "one-time" and deleted by the DisplayChart servlet right after it is streamed to the client)

I can't find where is the problem... can somebody help me ?

thank you

[demonhead]

Code: Select all

org.jfree.chart.servlet.ServletUtilities.registerChartForDeletion(ServletUtilities.java:310) 

Thats where the problem lies,have alook at the source code you shoudl be able to debug the problem

[eels06]

yes, you're right.

Here is the code of ServletUtilities.registerChartForDeletion(...)

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310 ChartDeleter chartDeleter = (ChartDeleter) Session.getAttribute("JFreeChart_Deleter");
311 if (chartDeleter == null) {
312    chartDeleter = new ChartDeleter();
313    session.setAttribute("JFreeChart_Deleter", chartDeleter);
314 }

It seems that i can't put a chartDeleter in my session... i gonna try to find out why

[eels06]

i can't manage to find why this code doesn't work...

i don't know why ServletUtilities is not able to put (or get) a chart deleter in (from) my Session ????

[Taqua]

The ChartDeleter class does not implement the Serializable interface. Fix that and you can add it to the session. (The servlet standard says, any object you add to the session must be serializable, so that it can be used in clustered environments.)

Regards,
Thomas

[eels06]

thanks for your answers.

[banman101]

I ran into this same problem. For me, it is caused by my having <distributable /> tag defined in my web.xml.

I passed in a null session to avoid the error as was described above.

[samsudeen]

Sir, I am having a problem with the ServletUtilities.java.
It being a java.lang.Class type I do not know how to
initialize this class with the web.xml file of a servlet
class, for exaple HelloServlet3.java. I am just one
among the beginners of the java programing language.
Kindly look forward for your reply. Appreciate
samsudeen