JSF with Simple Captcha

Question

I am using JSF 1.2 with RichFaces.
I want to implement SimpleCaptcha in the application.
On my loginpage I am able to add a captcha image.
Here is the exception that I get. This I get after when my jsp page(on which this image is) loads.
*StandardWrapperValve[StickyCaptcha]: PWC1406: Servlet.service() for servlet StickyCaptcha threw exception*
java.lang.IllegalStateException: PWC3999: Cannot create a session after the response has been committed
at org.apache.coyote.tomcat5.CoyoteRequest.doGetSession(CoyoteRequest.java:2709)
at org.apache.coyote.tomcat5.CoyoteRequest.getSession(CoyoteRequest.java:2482)
at org.apache.coyote.tomcat5.CoyoteRequestFacade.getSession(CoyoteRequestFacade.java:871)
at org.apache.coyote.tomcat5.CoyoteRequestFacade.getSession(CoyoteRequestFacade.java:882)
at javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:248)
at nl.captcha.servlet.SimpleCaptchaServlet.doGet(Unknown Source)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:718)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
What could be the reason?
Edited by: rajeev2009 on Mar 1, 2009 6:13 AM

Answer 1

I included
*<rich:paint2D id="painter" width="300" height="120"*
*data="#{PaintData}" format="png" paint="#{PaintBean.paint}" />*
in my Login Page.
I also included PaintData & PaintBean in the source package.
When the login *page loads for first time* I get this exception:-
StandardWrapperValve[Faces Servlet]: PWC1406: Servlet.service() for servlet Faces Servlet threw exception
javax.faces.FacesException: Error send image
at org.richfaces.renderkit.html.Paint2DResource.send(Paint2DResource.java:192)
at org.ajax4jsf.resource.ResourceLifecycle.sendResource(ResourceLifecycle.java:221)
at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265)
at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106)
Caused by: javax.faces.el.EvaluationException: /jsp/loginPage.xhtml @54,75 paint="#{PaintBean.paint}": java.lang.NullPointerException
at com.sun.facelets.el.LegacyMethodBinding.invoke(LegacyMethodBinding.java:73)
at org.richfaces.renderkit.html.Paint2DResource.send(Paint2DResource.java:182)
... 36 more
Caused by: java.lang.NullPointerException
at PaintBean.paint(PaintBean.java:23)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Edited by: rajeev2009 on Mar 7, 2009 7:24 AM