RememberMeManager NPE
---------------------

                 Key: SHIRO-150
                 URL: https://issues.apache.org/jira/browse/SHIRO-150
             Project: Shiro
          Issue Type: Bug
          Components: Web
    Affects Versions: 1.0.0
            Reporter: Ryan McKinley
            Priority: Minor


When clicking the 'logout' button in wicket-shiro, I see this error:

{panel}
WARN  - DefaultSecurityManager     - Delegate RememberMeManager
instance of type [org.apache.shiro.web.WebRememberMeManager] threw an
exception during getRememberedPrincipals().
java.lang.NullPointerException
       at 
org.apache.shiro.web.attr.CookieAttribute.getCookie(CookieAttribute.java:262)
       at 
org.apache.shiro.web.attr.CookieAttribute.removeValue(CookieAttribute.java:357)
       at 
org.apache.shiro.web.WebRememberMeManager.forgetIdentity(WebRememberMeManager.java:320)
       at 
org.apache.shiro.web.WebRememberMeManager.forgetIdentity(WebRememberMeManager.java:316)
       at 
org.apache.shiro.mgt.AbstractRememberMeManager.onRememberedPrincipalFailure(AbstractRememberMeManager.java:547)
       at 
org.apache.shiro.mgt.AbstractRememberMeManager.getRememberedPrincipals(AbstractRememberMeManager.java:488)
       at 
org.apache.shiro.mgt.DefaultSecurityManager.getRememberedIdentity(DefaultSecurityManager.java:610)
       at 
org.apache.shiro.mgt.DefaultSecurityManager.resolvePrincipals(DefaultSecurityManager.java:486)
       at 
org.apache.shiro.mgt.DefaultSecurityManager.createSubject(DefaultSecurityManager.java:363)
       at 
org.apache.shiro.mgt.DefaultSecurityManager.createSubject(DefaultSecurityManager.java:197)
       at 
org.apache.shiro.mgt.DefaultSecurityManager.login(DefaultSecurityManager.java:315)
       at 
org.apache.shiro.subject.DelegatingSubject.login(DelegatingSubject.java:249)
       at 
voyager.security.wicket.component.LoginPanel.login(LoginPanel.java:189)
       at 
voyager.security.wicket.component.LoginPanel$2.onSubmit(LoginPanel.java:83)
       at org.apache.wicket.markup.html.form.Form.delegateSubmit(Form.java:1538)
       at org.apache.wicket.markup.html.form.Form.process(Form.java:934)
       at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:896)
       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)
{panel}

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