无法将消息发布到Message Hub

// Asynchronous response from Message Hub / Kafka.
kafkaProducer.send(record,
new Callback() {
   public void onCompletion(RecordMetadata m, Exception e) {
       if(e != null) {
       e.printStackTrace();
       } else { 
    log.debug(" **** Message sent, offset: " + m.offset() + 
    " @ partition " + m.partition());
    log.debug(" <<<< " +
    " document_id " + key +
    " @ " + account.getActivityId());
    }
   }
});

尝试使用上述代码将消息发布到Message Hub时，我们始终会收到以下错误 .

2016-06-21 18：38：22- [INFO] com.ibm.cloudant.streaming.messageHub.Client.send（476）：>>>>发送document_id julia30 @ my_database 2016-06-21 18:38： 22- [DEBUG] org.apache.kafka.clients.NetworkClient $ DefaultMetadataUpdater.maybeUpdate（623）：初始化到节点-1的连接以发送元数据请求2016-06-21 18：38：22- [DEBUG] org.apache . kafka.clients.NetworkClient.initiateConnect（487）：在kafka01-prod01.messagehub.services.us-south.bluemix.net:9093启动与节点-1的连接 . 2016-06-21 18：38：22- [DEBUG] org.apache.kafka.common.security.authenticator.SaslClientAuthenticator $ 1.run（105）：创建SaslClient：client=multiuser-adapter@multiuser.messagehub.ibm.com ; service = kafka; serviceHostname = kafka01-prod01.messagehub.services.us-south.bluemix.net; mechs = [GSSAPI] 2016-06-21 18：38：22- [DEBUG] com.ibm.cloudant.streaming . messageHub.AccountManager . （53）：进程ID：15825 2016-06-21 18：38：22- [INFO] org.apache.kafka.common.network.SaslChannelBuilder.buildChannel（92）：由于org而无法创建 Channels .apache.kafka.common.KafkaException：在org.apache.kafka.common.network.SaslChannelBuilder.buildChannel上的org.apache.kafka.common.security.authenticator.SaslClientAuthenticator.configure（SaslClientAuthenticator.java:96）中配置SaslClientAuthenticator失败（SaslChannelBuilder.java:89）org.apache.kafka.common.network.Selector.connect（Selector.java:162）org.apache.kafka.clients.NetworkClient.initiateConnect（NetworkClient.java:489）at org . apache.kafka.clients.Net位于org.apache.kafka.clients.NetworkClient的org.apache.kafka.clients.NetworkClient $ DefaultMetadataUpdater.maybeUpdate（NetworkClient.java:624）中的workClient.access $ 400（NetworkClient.java:47）$ DefaultMetadataUpdater.maybeUpdate（NetworkClient.java） ：543）在org.apache的org.apache.kafka.clients.NetworkClient.poll（NetworkClient.java:254）org.apache.kafka.clients.producer.internals.Sender.run（Sender.java:216） . java.lang.Thread.run上的kafka.clients.producer.internals.Sender.run（Sender.java:128）（Thread.java:745）引起：org.apache.kafka.common.KafkaException：创建SaslClient失败在org.apache.kafka.common.security.authenticator.SaslClientAuthenticator.createSaslClient（SaslClientAuthenticator.java:112）org.apache.kafka.common.security.authenticator.SaslClientAuthenticator.configure（SaslClientAuthenticator.java:94）... 10更多引起：javax.security.sasl.SaslException：PLAIN：必须在com.sun.security.sasl.PlainClient中指定授权标识和密码 . （PlainClient.java:58 ）com.sun.security.sasl.ClientFactoryImpl.createSaslClient（ClientFactoryImpl.java:97）at javax.security.sasl.Sasl.createSaslClient（Sasl.java:384）at com.ibm.messagehub.login.MessageHubSaslClientFactory.createSaslClient（ MessageHubSaslClientFactory.java:77）在org.apache.kafka.com上的org.apache.kafka.common.security.authenticator.SaslClientAuthenticator $ 1.run（SaslClientAuthenticator.java:107）的javax.security.sasl.Sasl.createSaslClient（Sasl.java:384） . apache.kafka.common.security.authenticator.SaslClientAuthenticator $ 1.run（SaslClientAuthenticator.java:102）at java.security.AccessController.doPrivileged（Native Method）at javax.security.auth.Subject.doAs（Subject.java:422）在org.apache.kafka.common.security.authenticator.SaslClientAuthenticator.createSaslClient（SaslClientAuthenticator.java:102）... 11更多2016-06-21 18：38：22- [ERROR] org.apache.kafka.clients . producer.internals.Sender.run（130）：kafka生成器I / O线程中未捕获的错误：org.apache.kafka.common.KafkaException：org.apache.kafka.common.Ka fkaException：无法在org.apache.kafka.com上运行org.apache.kaf上的org.apache.kaf上的org.apache.kaf上的SaslClientAuthenticator（SaslChannelBuilder.java：93）org.apache.kafka.common.network.Selector.connect（Selector.java:162） .apache.kafka.clients.NetworkClient.initiateConnect（NetworkClient.java:489）atg.apache.kafka.clients.NetworkClient.access $ 400（NetworkClient.java:47）org.apache.kafka.clients.NetworkClient $ DefaultMetadataUpdater . maybeUpdate（NetworkClient.java:624）org.apache.kafka.clients.NetworkClient $ DefaultMetadataUpdater.maybeUpdate（NetworkClient.java:543）atg.apache.kafka.clients.NetworkClient.poll（NetworkClient.java:254）org .apache.kafka.clients.producer.internals.Sender.run（Sender.java:216）at org.apache.kafka.clients.producer.internals.Sender.run（Sender.java:128）at atjava.lang.Thread.run（Thread.java:745）引起：org.apache.kafka.common.KafkaException：无法在org.apache.kafka.common.security.authenticator.SaslClientAuthenticator.configure（SaslClientAuthenticator . ）中配置SaslClientAuthenticator . java：96）at org.apache.kafka.common.network.SaslChannelBuilder.buildChannel（SaslChannelBuilder.java:89）... 9更多引起：org.apache.kafka.common.KafkaException：无法在org创建SaslClient . org.apache.kafka.common.security.authenticator.SaslClientAuthenticator.configure（SaslClientAuthenticator.java:94）中的apache.kafka.common.security.authenticator.SaslClientAuthenticator.createSaslClient（SaslClientAuthenticator.java:112）... 10更多由：javax.security.sasl.SaslException：PLAIN：必须在com.sun.security.sasl.PlainClient上指定授权标识和密码 . （PlainClient.java:58）com.sun.security.sasl.ClientFactoryImpl.createSaslClient（ClientFactoryImpl） .java：97）at javax.security.sasl.Sasl.createSaslClient（Sasl.java:384）at c位于org.apache.kafka.common.security.authenticator.SaslClientAuthenticator $ 1的javax.security.sasl.Sasl.createSaslClient（Sasl.java:384）中的om.ibm.messagehub.login.MessageHubSaslClientFactory.createSaslClient（MessageHubSaslClientFactory.java:77） .run（SaslClientAuthenticator.java:107）位于javax.security的java.security.AccessController.doPrivileged（Native Method）的org.apache.kafka.common.security.authenticator.SaslClientAuthenticator $ 1.run（SaslClientAuthenticator.java:102） . auth.Subject.doAs（Subject.java:422）at org.apache.kafka.common.security.authenticator.SaslClientAuthenticator.createSaslClient（SaslClientAuthenticator.java:102）... 11更多2016-06-21 18:38:22 - [ERROR] org.apache.kafka.clients.producer.internals.Sender.run（130）：kafka生成器I / O线程中未捕获的错误：org.apache.kafka.common.network.Selector中的java.lang.NullPointerException .poll（Selector.java:268）位于org.apache.kafka.clients.producer.internals.Se的org.apache.kafka.clients.NetworkClient.poll（NetworkClient.java:256） nder.run（Sender.java:216）at org.apache.kafka.clients.producer.internals.Sender.run（Sender.java:128）at java.lang.Thread.run（Thread.java:745）

制作人的设置如下：

```java
compression.type = none
 metric.reporters = []
 metadata.max.age.ms = 300000
 metadata.fetch.timeout.ms = 60000
 reconnect.backoff.ms = 50
 sasl.kerberos.ticket.renew.window.factor = 0.8
 bootstrap.servers = [kafka01-prod01.messagehub.services.us-south.bluemix.net:9093]
 retry.backoff.ms = 100
 sasl.kerberos.kinit.cmd = /usr/bin/kinit
 buffer.memory = 33554432
 timeout.ms = 30000
 key.serializer = class org.apache.kafka.common.serialization.StringSerializer
 sasl.kerberos.service.name = null
 sasl.kerberos.ticket.renew.jitter = 0.05
 ssl.keystore.type = JKS
 ssl.trustmanager.algorithm = PKIX
 block.on.buffer.full = false
 ssl.key.password = null
 max.block.ms = 60000
 sasl.kerberos.min.time.before.relogin = 60000
 connections.max.idle.ms = 540000
 ssl.truststore.password = [hidden]
 max.in.flight.requests.per.connection = 5
 metrics.num.samples = 2
 client.id = kafka01-prod01.messagehub.services.us-south.bluemix.net%3A9093_8qp87X32V6PK5epv.1
 ssl.endpoint.identification.algorithm = HTTPS
 ssl.protocol = TLSv1.2
 request.timeout.ms = 30000
 ssl.provider = null
 ssl.enabled.protocols = [TLSv1.2]
 acks = -1
 batch.size = 16384
 ssl.keystore.location = null
 receive.buffer.bytes = 32768
 ssl.cipher.suites = null
 ssl.truststore.type = JKS
 security.protocol = SASL_SSL
 retries = 1
 max.request.size = 1048576
 value.serializer = class  org.apache.kafka.common.serialization.StringSerializer
 ssl.truststore.location = /Users/jiangph/tools/liberty/usr/shared/resources/keystore.jks
 ssl.keystore.password = null
 ssl.keymanager.algorithm = SunX509
 metrics.sample.window.ms = 30000
 send.buffer.bytes = 131072
 linger.ms = 0

使用上述设置，使用Message Hub rest API创建主题没有问题 . 尝试发布邮件时会发生此问题 . 

任何想法都非常感谢 .