Jsf and Seam

Hi,
I have a JSF project and would like to add a Captcha on the new user page.
I see several examples with Seam.
http://www.digitalsanctuary.com/tech-blog/java/jboss/seam/captcha-with-seam-in-three-minutes.html
http://thelabdude.blogspot.com/2009/05/user-registration-solution-using-jboss.html
1) What do I need to add Seam to my app? Is it worth it from Captcha?
http://livedemo.exadel.com/richfaces-demo/richfaces/paint2D.jsf?s=glassX
I copied this into my app to test and get several errors. I did not see the problem?
I see a NullPointer error..but dont know where to set it.
SEVERE: 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 org.ajax4jsf.resource.ResourceLifecycle.send(ResourceLifecycle.java:146)
        at org.ajax4jsf.resource.InternetResourceService.serviceResource(InternetResourceService.java:225)
        at org.ajax4jsf.resource.InternetResourceService.serviceResource(InternetResourceService.java:141)
        at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:496)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
        at java.lang.Thread.run(Unknown Source)
Caused by: javax.faces.el.EvaluationException: org.apache.jasper.el.JspELException: /loginTest.jsp(62,2) '#{paintBean.paint}' java.lang.NullPointerException
        at org.richfaces.webapp.taglib.MethodBindingMethodExpressionAdaptor.invoke(MethodBindingMethodExpressionAdaptor.java:56)
        at org.richfaces.renderkit.html.Paint2DResource.send(Paint2DResource.java:182)
        ... 17 more
Caused by: org.apache.jasper.el.JspELException: /loginTest.jsp(62,2) '#{paintBean.paint}' java.lang.NullPointerException
        at org.apache.jasper.el.JspMethodExpression.invoke(JspMethodExpression.java:77)
        at org.richfaces.webapp.taglib.MethodBindingMethodExpressionAdaptor.invoke(MethodBindingMethodExpressionAdaptor.java:52)
        ... 18 more
Caused by: java.lang.NullPointerException
        at com.netfixup.java.PaintBean.paint(Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)Anyone out there have and easy quick way to do Captcha with just JSF ? or should I go with Seam?
Thanks
Phil
Edited by: nohacks on Aug 20, 2009 4:08 AM

Going to seam might not be the answer to your problems. For one seam is not easy to get running on anything but a JBoss server (it is possible, but not easy). Secondly Seam is aimed at bringing JSF and EJBs closer together, among other things. Since you are running on Tomcat, I don't think you are using EJBs and therefore the use of Seam degrades greatly.
The root of the problem is easy enough to spot:
/loginTest.jsp(62,2) '#{paintBean.paint}'So what is this paintBean doing? If you have access to the code, you could check out the method that gives the error:
com.netfixup.java.PaintBean.paintto try and figure out what is null. SOMETHING is apparently not initialized properly, but unless the server logs can give you a hint what that something is, it is hard to help you further.

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Message was edited by:
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