View source for Unable to login due to NullPointerException.

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=Unable to login after disabling  2FA for an account.=
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{{KB|{{WIP}}|{{ZCS 8.8}}|{{ZCS 9.0}}}}
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====Problem====
Unable to login and getting '''"an unknown error has occurred"''' in webmail and '''"java.lang.NullPointerException"''' warning in mailbox.log after disabling Zimbra two-factor authentication for an account.

Mailbox.log:

<pre>
2021-09-29 16:00:49,850 WARN  [qtp2076287037-586://localhost:8080/service/soap/BatchRequest] [name=user@example.com;oip=192.168.0.2;ua=zclient/8.8.15_GA_4059;soapId=3361a71a;] SoapEngine - handler exception
java.lang.NullPointerException
        at com.zimbra.cs.twofactor.app.ZimbraAppSpecificPasswords.getAndRefreshPasswords(ZimbraAppSpecificPasswords.java:59)
        at com.zimbra.cs.twofactor.app.ZimbraAppSpecificPasswords.loadAppPasswords(ZimbraAppSpecificPasswords.java:43)
        at com.zimbra.cs.twofactor.app.ZimbraAppSpecificPasswords.<init>(ZimbraAppSpecificPasswords.java:39)
        at com.zimbra.cs.twofactor.app.ZimbraAppSpecificPasswords.<init>(ZimbraAppSpecificPasswords.java:33)
        at com.zimbra.cs.twofactor.ZimbraTwoFactorAuth.<init>(ZimbraTwoFactorAuth.java:69)
        at com.zimbra.cs.twofactor.ZimbraTwoFactorAuth.<init>(ZimbraTwoFactorAuth.java:64)
        at com.zimbra.cs.twofactor.ZimbraTwoFactorAuth$AuthFactory.getTwoFactorAuth(ZimbraTwoFactorAuth.java:82)
        at com.zimbra.cs.service.account.Auth.handle(Auth.java:301)
        at com.zimbra.soap.SoapEngine.dispatchRequest(SoapEngine.java:646)
        at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.java:471)
        at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.java:278)
        at com.zimbra.soap.SoapServlet.doWork(SoapServlet.java:308)
        at com.zimbra.soap.SoapServlet.doPost(SoapServlet.java:217)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
        at com.zimbra.cs.servlet.ZimbraServlet.service(ZimbraServlet.java:214)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:873)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1623)
        at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:214)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610)
        at com.zimbra.cs.servlet.CsrfFilter.doFilter(CsrfFilter.java:175)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610)
        at com.zimbra.cs.servlet.RequestStringFilter.doFilter(RequestStringFilter.java:54)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610)
        at com.zimbra.cs.servlet.SetHeaderFilter.doFilter(SetHeaderFilter.java:59)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610)
        at com.zimbra.cs.servlet.ETagHeaderFilter.doFilter(ETagHeaderFilter.java:47)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610)
        at com.zimbra.cs.servlet.ContextPathBasedThreadPoolBalancerFilter.doFilter(ContextPathBasedThreadPoolBalancerFilter.java:107)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610)
        at com.zimbra.cs.servlet.ZimbraQoSFilter.doFilter(ZimbraQoSFilter.java:116)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610)
        at com.zimbra.cs.servlet.ZimbraInvalidLoginFilter.doFilter(ZimbraInvalidLoginFilter.java:131)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610)
        at org.eclipse.jetty.servlets.DoSFilter.doFilterChain(DoSFilter.java:482)
        at org.eclipse.jetty.servlets.DoSFilter.doFilter(DoSFilter.java:327)
        at org.eclipse.jetty.servlets.DoSFilter.doFilter(DoSFilter.java:297)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1610)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1700)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1345)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480)
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1667)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1247)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
        at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:220)
        at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:152)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335)
        at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:753)
        at org.eclipse.jetty.server.handler.DebugHandler.handle(DebugHandler.java:83)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.server.Server.handle(Server.java:505)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:370)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:267)
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
        at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
        at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:698)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:804)
        at java.base/java.lang.Thread.run(Thread.java:830)
</pre>


====Solution====

To fix this issue,set '''"zimbraAppSpecificPasswordDuration"''' for one minute.

Run as Zimbra user:
  $ zmprov ma user@example.com zimbraAppSpecificPasswordDuration 1m
  $ zmprov fc -a all

The above attribute will expire AppSpecific password after one minute. The default value of this attribute is 0(never expired).

'''Note:''' This password can't removed or reset as it's saved in salted hash format in LDAP, only way to set password expiry duration.

Set the default value "0", once the user able to login.
Run as Zimbra user:
  $ zmprov ma user@example.com zimbraAppSpecificPasswordDuration 0
  $ zmprov fc -a all

<pre>
 $zmprov desc -a zimbraAppSpecificPasswordDuration
zimbraAppSpecificPasswordDuration
    lifetime of app-specific passwords, or 0 for no expiry. Must be in
    valid duration format: {digits}{time-unit}. digits: 0-9, time-unit:
    [hmsd]|ms. h - hours, m - minutes, s - seconds, d - days, ms -
    milliseconds. If time unit is not specified, the default is
    s(seconds).

               type : duration
              value :
           callback :
          immutable : false
        cardinality : single
         requiredIn :
         optionalIn : account,cos
              flags : accountInherited
           defaults : 0
                min : 0
                max :
                 id : 1839
    requiresRestart :
              since : 8.7.0,9.0.0
    deprecatedSince :

</pre>