@Override
    public AppConfigurationEntry[] getAppConfigurationEntry(String name) {
        if (this.loginContextName.equals(name))
            return configEntries.toArray(new AppConfigurationEntry[0]);
        else
            return  null;
    }
JAAS configuration parser that constructs a JAAS configuration object with a single
login context from the Kafka configuration option {@link SaslConfigs#SASL_JAAS_CONFIG}.
<p/>
JAAS configuration file format is described <a href="http://docs.oracle.com/javase/8/docs/technotes/guides/security/jgss/tutorials/LoginConfigFile.html">here</a>.
The format of the property value is:
<pre>
{@code
  <loginModuleClass> <controlFlag> (<optionName>=<optionValue>)*;
}
</pre>
clients/src/main/java/org/apache/kafka/common/security/JaasConfig.java