[jira] [Created] (TAP5-1934) Kaptcha Component throws NPE after session is expired

["Petr Charvát (JIRA)" <ji...@apache.org>]

Petr Charvát created TAP5-1934:
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             Summary: Kaptcha Component throws NPE after session is expired
                 Key: TAP5-1934
                 URL: https://issues.apache.org/jira/browse/TAP5-1934
             Project: Tapestry 5
          Issue Type: Bug
          Components: tapestry-kaptcha
    Affects Versions: 5.3.2
            Reporter: Petr Charvát
            Priority: Minor


A have a page with kaptchaField and Kaptcha image - OK.
The page is renered under URL e.g. http://localhost:8080/myapp/registration - OK.

But if the bad user (robot) hit url with  http://localhost:8080/myapp/registration.kaptcha:image after the session is expired, NPE it thrown - NOK.

How to protect the page?

Caused by: org.apache.tapestry5.runtime.ComponentEventException [at context:Registration.tml, line 24]
	at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.processEventTriggering(ComponentPageElementImpl.java:1130)
	at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.access$3200(ComponentPageElementImpl.java:61)
	at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$5.invoke(ComponentPageElementImpl.java:1051)
	at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$5.invoke(ComponentPageElementImpl.java:1048)
	at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:74)
	... 70 more
Caused by: java.lang.NullPointerException
	at com.google.code.kaptcha.text.impl.DefaultWordRenderer.renderWord(DefaultWordRenderer.java:55)
	at com.google.code.kaptcha.impl.DefaultKaptcha.createImage(DefaultKaptcha.java:43)
	at 

org.apache.tapestry5.kaptcha.internal.services.KaptchaProducerImpl.createImage(KaptchaProducerImpl.java:57)
	at $KaptchaProducer_b9452c5536c8e.createImage(Unknown Source)
	at org.apache.tapestry5.kaptcha.components.KaptchaImage.onImage(KaptchaImage.java:90)
	at org.apache.tapestry5.kaptcha.components.KaptchaImage.dispatchComponentEvent(KaptchaImage.java)
	at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.dispatchEvent(ComponentPageElementImpl.java:923)
	at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.processEventTriggering(ComponentPageElementImpl.java:1106)
	... 74 more

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