SAML adapter does not support boolean attribute value types.

The problematic saml assertion contains an attribute that looks like the following:

<Attribute xmlns:a="http://schemas.xmlsoap.org/ws/2009/09/identity/claims" Name="http://schemas.microsoft.com/ws/2012/01/insidecorporatenetwork" a:OriginalIssuer="CLIENT CONTEXT">
<AttributeValue xmlns:tn="http://www.w3.org/2001/XMLSchema" xmlns:b="http://www.w3.org/2001/XMLSchema-instance" b:type="tn:boolean">true</AttributeValue>
</Attribute>

KeyCloak fails with the following exception:

2016-11-14 12:53:39,352 ERROR [org.keycloak.saml.common] (default task-29) Error in base64 decoding saml message: ParsingException [location=null]org.keycloak.saml.common.exceptions.ParsingException: PL0065: Parser : Unknown xsi:type=tn:boolean
2016-11-14 12:53:39,352 ERROR [io.undertow.request] (default task-29) UT005023: Exception handling request to /testapp-war/saml: java.lang.NullPointerException
at org.keycloak.adapters.saml.profile.AbstractSamlAuthenticationHandler.handleSamlResponse(AbstractSamlAuthenticationHandler.java:172)
at org.keycloak.adapters.saml.profile.webbrowsersso.SamlEndpoint.handle(SamlEndpoint.java:44)
at org.keycloak.adapters.saml.SamlAuthenticator.authenticate(SamlAuthenticator.java:48)
at org.keycloak.adapters.saml.undertow.AbstractSamlAuthMech.authenticate(AbstractSamlAuthMech.java:116)
at io.undertow.security.impl.SecurityContextImpl$AuthAttempter.transition(SecurityContextImpl.java:244)
at io.undertow.security.impl.SecurityContextImpl$AuthAttempter.access$100(SecurityContextImpl.java:230)
at io.undertow.security.impl.SecurityContextImpl.attemptAuthentication(SecurityContextImpl.java:124)
at io.undertow.security.impl.SecurityContextImpl.authTransition(SecurityContextImpl.java:99)
at io.undertow.security.impl.SecurityContextImpl.authenticate(SecurityContextImpl.java:92)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:55)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AuthenticationConstraintHandler.handleRequest(AuthenticationConstraintHandler.java:51)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.servlet.handlers.security.ServletSecurityConstraintHandler.handleRequest(ServletSecurityConstraintHandler.java:59)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:285)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:264)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:175)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:207)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:802)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)