[jira] [Created] (KAFKA-5802) ScramServerCallbackHandler#handle should check username not being null before calling credentialCache.get()

[Ted Yu (JIRA)]

Ted Yu created KAFKA-5802:
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             Summary: ScramServerCallbackHandler#handle should check username 
not being null before calling credentialCache.get()
                 Key: KAFKA-5802
                 URL: https://issues.apache.org/jira/browse/KAFKA-5802
             Project: Kafka
          Issue Type: Bug
            Reporter: Ted Yu
            Priority: Minor


{code}
        String username = null;
        for (Callback callback : callbacks) {
            if (callback instanceof NameCallback)
                username = ((NameCallback) callback).getDefaultName();
            else if (callback instanceof ScramCredentialCallback)
                ((ScramCredentialCallback) 
callback).scramCredential(credentialCache.get(username));
{code}
Since ConcurrentHashMap, used by CredentialCache, doesn't allow null keys, we 
should check that username is not null before calling credentialCache.get()



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