Spring integration Spring Kafka Integration 1.0.0.与制作人发布

我无法使用SpringKafka集成发布消息，尽管我的Kafka Java客户端工作正常

Java代码在Windows上运行，Kafka在Linux上运行

 KafkaProducerContext<String, String> kafkaProducerContext = new KafkaProducerContext<String, String>();
    ProducerMetadata<String, String> producerMetadata = new ProducerMetadata<String, String>("test-cass");
    producerMetadata.setValueClassType(String.class);
    producerMetadata.setKeyClassType(String.class);
    Encoder<String> encoder = new StringEncoder<String>();
    producerMetadata.setValueEncoder(encoder);
    producerMetadata.setKeyEncoder(encoder);

    ProducerFactoryBean<String, String> producer = new ProducerFactoryBean<String, String>(producerMetadata, "172.16.1.42:9092");

    ProducerConfiguration<String, String> config = new ProducerConfiguration<String, String>(producerMetadata, producer.getObject());
    kafkaProducerContext.setProducerConfigurations(Collections.singletonMap("test-cass", config));
    KafkaProducerMessageHandler<String, String> handler = new KafkaProducerMessageHandler<String, String>(kafkaProducerContext);
    handler.handleMessage(MessageBuilder.withPayload("foo")
            .setHeader("messagekey", "3")
            .setHeader("topic", "test-cass")
            .build());

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实际上，当我们引入卡夫卡领导者时，我们做了适当的文档更改：。见重要说明：

自上一个里程碑以来，我们引入了带有常量的KafkaHeaders接口。messageKey和topic默认标题现在需要卡夫卡前缀。从早期版本迁移时，需要在上指定message key expression=“headers.messageKey”和topic expression=“headers.topic”，或者只需使用或MessageBuilder将头从KafkaHeaders上游更改为新头。当然，如果使用常量值，也可以在适配器上配置它们

更新

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关于

NullPointerException

：这确实是一个问题。请随便开罚单，我们会处理的。我们甚至欢迎参加这个活动

我找到了解决方案，但是Spring团队需要解决这个问题。如果你在邮件标题中用卡夫卡作为主题的前缀，它会起作用。我有一个类似的问题，有人能帮忙吗？谢谢你的澄清。在使用卡夫卡领导人之后，问题得到了解决。

"C:\Program Files\Java\jdk1.7.0_71\bin\java" -Didea.launcher.port=7542 "-Didea.launcher.bin.path=C:\Program Files (x86)\JetBrains\IntelliJ IDEA 13.1.6\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.7.0_71\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.7.0_71\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.7.0_71\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.7.0_71\jre\lib\jce.jar;C:\Program Files\Java\jdk1.7.0_71\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.7.0_71\jre\lib\jfxrt.jar;C:\Program Files\Java\jdk1.7.0_71\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.7.0_71\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.7.0_71\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.7.0_71\jre\lib\resources.jar;C:\Program Files\Java\jdk1.7.0_71\jre\lib\rt.jar;C:\Program Files\Java\jdk1.7.0_71\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.7.0_71\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.7.0_71\jre\lib\ext\jaccess.jar;C:\Program 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ics-core-2.2.0.jar;C:\Users\hs\.m2\repository\org\apache\kafka\kafka_2.10\0.8.1.1\kafka_2.10-0.8.1.1.jar;C:\Users\hs\.m2\repository\org\apache\zookeeper\zookeeper\3.3.4\zookeeper-3.3.4.jar;C:\Users\hs\.m2\repository\log4j\log4j\1.2.15\log4j-1.2.15.jar;C:\Users\hs\.m2\repository\javax\mail\mail\1.4\mail-1.4.jar;C:\Users\hs\.m2\repository\javax\activation\activation\1.1\activation-1.1.jar;C:\Users\hs\.m2\repository\javax\jms\jms\1.1\jms-1.1.jar;C:\Users\hs\.m2\repository\com\sun\jdmk\jmxtools\1.2.1\jmxtools-1.2.1.jar;C:\Users\hs\.m2\repository\com\sun\jmx\jmxri\1.2.1\jmxri-1.2.1.jar;C:\Users\hs\.m2\repository\jline\jline\0.9.94\jline-0.9.94.jar;C:\Users\hs\.m2\repository\net\sf\jopt-simple\jopt-simple\3.2\jopt-simple-3.2.jar;C:\Users\hs\.m2\repository\org\scala-lang\scala-library\2.10.1\scala-library-2.10.1.jar;C:\Users\hs\.m2\repository\com\101tec\zkclient\0.3\zkclient-0.3.jar;C:\Program Files (x86)\JetBrains\IntelliJ IDEA 13.1.6\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain com.agillic.dialogue.kafka.outbound.SpringKafkaTest
15:39:11.736 [main] INFO  o.s.i.k.support.ProducerFactoryBean - Using producer properties => {metadata.broker.list=172.16.1.42:9092, compression.codec=0}
2015-02-19 15:39:12 INFO  VerifiableProperties:68 - Verifying properties
2015-02-19 15:39:12 INFO  VerifiableProperties:68 - Property compression.codec is overridden to 0
2015-02-19 15:39:12 INFO  VerifiableProperties:68 - Property metadata.broker.list is overridden to 172.16.1.42:9092
15:39:12.164 [main] INFO  o.s.b.f.config.PropertiesFactoryBean - Loading properties file from URL [jar:file:/C:/Users/hs/.m2/repository/org/springframework/integration/spring-integration-core/4.1.2.RELEASE/spring-integration-core-4.1.2.RELEASE.jar!/META-INF/spring.integration.default.properties]
15:39:12.208 [main] DEBUG o.s.i.k.o.KafkaProducerMessageHandler - org.springframework.integration.kafka.outbound.KafkaProducerMessageHandler@5204db6b received message: GenericMessage [payload=foo, headers={timestamp=1424356752208, id=00c483d9-ecf8-2937-4a2c-985bd3afcae4, topic=test-cass, messagekey=3}]
Exception in thread "main" org.springframework.messaging.MessageHandlingException: error occurred in message handler [org.springframework.integration.kafka.outbound.KafkaProducerMessageHandler@5204db6b]; nested exception is java.lang.NullPointerException
    at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:84)
    at com.agillic.dialogue.kafka.outbound.SpringKafkaTest.main(SpringKafkaTest.java:40)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Caused by: java.lang.NullPointerException
    at org.springframework.integration.kafka.support.KafkaProducerContext.getTopicConfiguration(KafkaProducerContext.java:58)
    at org.springframework.integration.kafka.support.KafkaProducerContext.send(KafkaProducerContext.java:190)
    at org.springframework.integration.kafka.outbound.KafkaProducerMessageHandler.handleMessageInternal(KafkaProducerMessageHandler.java:81)
    at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:78)
    ... 6 more

Process finished with exit code 1