Elytron, mechanism-names is not checked on defined allowed values.

/subsystem=elytron/kerberos-security-factory=c:add(principal="HTTP/localhost", path="/not/exist", mechanism-names=[DOES_NOT_EXIST])

[standalone@localhost:9990 /] /subsystem=elytron/kerberos-security-factory=c:add(principal="HTTP/localhost", path="/not/exist", mechanism-names=[DOES_NOT_EXIST])
{
    "outcome" => "failed",
    "failure-description" => "WFLYCTL0158: Operation handler failed: java.lang.IllegalArgumentException: GSSException: Improperly formatted Object Identifier String - null",
    "rolled-back" => true
}

"mechanism-names" => {
    "type" => LIST,
    "description" => "The mechanism names the credential should be usable with. Names will be converted to OIDs and used together with OIDs from mechanism-oids attribute.",
    "expressions-allowed" => true,
    "required" => false,
    "nillable" => true,
    "default" => [
        "KRB5",
        "SPNEGO"
    ],
    "allowed" => [
        "KRB5LEGACY",
        "GENERIC",
        "KRB5",
        "KRB5V2",
        "SPNEGO"
    ],
    "value-type" => STRING,
    "access-type" => "read-write",
    "storage" => "configuration",
    "restart-required" => "resource-services"
}

07:15:56,489 ERROR [org.jboss.as.controller.management-operation] (management-handler-thread - 4) WFLYCTL0013: Operation ("add") failed - address: ([
    ("subsystem" => "elytron"),
    ("kerberos-security-factory" => "c")
]): java.lang.IllegalArgumentException: GSSException: Improperly formatted Object Identifier String - null
	at org.wildfly.extension.elytron.KerberosSecurityFactoryDefinition$2.lambda$getValueSupplier$1(KerberosSecurityFactoryDefinition.java:172)
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
	at java.util.LinkedList$LLSpliterator.forEachRemaining(LinkedList.java:1235)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
	at java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:312)
	at java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:742)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
	at org.wildfly.extension.elytron.KerberosSecurityFactoryDefinition$2.getValueSupplier(KerberosSecurityFactoryDefinition.java:174)
	at org.wildfly.extension.elytron.TrivialAddHandler.performRuntime(TrivialAddHandler.java:77)
	at org.jboss.as.controller.AbstractAddStepHandler$1.execute(AbstractAddStepHandler.java:151)
	at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:979)
	at org.jboss.as.controller.AbstractOperationContext.processStages(AbstractOperationContext.java:722)
	at org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:441)
	at org.jboss.as.controller.OperationContextImpl.executeOperation(OperationContextImpl.java:1397)
	at org.jboss.as.controller.ModelControllerImpl.internalExecute(ModelControllerImpl.java:421)
	at org.jboss.as.controller.ModelControllerImpl.lambda$execute$1(ModelControllerImpl.java:243)
	at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:263)
	at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:229)
	at org.jboss.as.controller.ModelControllerImpl.execute(ModelControllerImpl.java:243)
	at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler.doExecute(ModelControllerClientOperationHandler.java:217)
	at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler.access$400(ModelControllerClientOperationHandler.java:137)
	at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler$1$1.run(ModelControllerClientOperationHandler.java:161)
	at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler$1$1.run(ModelControllerClientOperationHandler.java:157)
	at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:287)
	at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:244)
	at org.jboss.as.controller.AccessAuditContext.doAs(AccessAuditContext.java:254)
	at org.jboss.as.controller.AccessAuditContext.doAs(AccessAuditContext.java:225)
	at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler$1.execute(ModelControllerClientOperationHandler.java:157)
	at org.jboss.as.protocol.mgmt.ManagementRequestContextImpl$1.doExecute(ManagementRequestContextImpl.java:70)
	at org.jboss.as.protocol.mgmt.ManagementRequestContextImpl$AsyncTaskRunner.run(ManagementRequestContextImpl.java:160)
	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)
	at org.jboss.threads.JBossThread.run(JBossThread.java:320)
Caused by: GSSException: Improperly formatted Object Identifier String - null
	at org.ietf.jgss.Oid.<init>(Oid.java:71)
	at org.wildfly.extension.elytron.KerberosSecurityFactoryDefinition$2.lambda$getValueSupplier$1(KerberosSecurityFactoryDefinition.java:170)
	... 39 more