[英]Kafka Producer Exception NoClassDefFoundError
I have some problem with kafka Producer, but i dont know how i can solved it 我对kafka Producer有一些问题,但我不知道我怎么能解决它
My Maven Dependency: 我的Maven依赖:
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.10</artifactId>
<version>0.10.1.1</version>
</dependency>
If i create: 如果我创建:
Producer<String, byte[]> producer = createKafkaProducer();
I become Exception: 我变成了例外:
java.lang.NoClassDefFoundError: org/apache/kafka/clients/producer/Producer
at de.dienes.opitz.node.NodesValue.onSubscriptionValue(NodesValue.java:120)
at org.eclipse.milo.opcua.sdk.client.subscriptions.OpcUaMonitoredItem.onValueArrived(OpcUaMonitoredItem.java:176)
at org.eclipse.milo.opcua.sdk.client.subscriptions.OpcUaSubscriptionManager.lambda$null$28(OpcUaSubscriptionManager.java:547)
at org.eclipse.milo.opcua.stack.core.util.ExecutionQueue$PollAndExecute.run(ExecutionQueue.java:107)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: org.apache.kafka.clients.producer.Producer
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 9 common frames omitted
Idea where is the problem? 想法问题在哪里?
org.apache.kafka.clients.producer.Producer
is in the kafka-clients
artifact. org.apache.kafka.clients.producer.Producer
位于kafka-clients
工件中。 You should use 你应该用
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>0.10.2.1</version>
</dependency>
kafka_2.10
is the artifact for the broker. kafka_2.10
是经纪人的工件。 You don't need it if you're just writing a producer/consumer (except for integration testing your producer/consumer against a test cluster). 如果您只是编写生产者/消费者(除了针对测试集群对生产者/消费者进行集成测试之外),则不需要它。
if i use 如果我使用
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>0.10.2.1</version>
</dependency>
I become the new Error: KafkaProducer Claas not found. 我成了新的错误:找不到KafkaProducer Claas。
If i doing this with my java Client and create a Producer, error: 如果我使用我的Java客户端执行此操作并创建生产者,则错误:
java.lang.NoClassDefFoundError: org/apache/kafka/clients/producer/KafkaProducer
I testet it on the server with console producer and console consumer, it works! 我在控制台生产商和控制台消费者的服务器上测试它,它的工作原理! But with java client become a Exception.
但随着java客户端成为一个例外。 I have no idea more
我不知道更多
This happened to me too. 这也发生在我身上。 I solved it using BootStrapExtansionSchema like this :
我用BootStrapExtansionSchema解决了这个问题:
java -Xbootclasspath/a:tyrus.jar -jar MyJar.jar
java -Xbootclasspath / a:tyrus.jar -jar MyJar.jar
You can add many libraries seperated by :
您可以添加许多库分隔
:
java -Xbootclasspath/a:/usr/local/kafka/libs/kafka-clien-1.0.0.jar:tyrus.jar -jar MyJar.jar
java -Xbootclasspath / a:/usr/local/kafka/libs/kafka-clien-1.0.0.jar:tyrus.jar -jar MyJar.jar
Or you can simply package everything together, using 或者你可以简单地将所有东西打包在一起
maven-assembly-plugin
add this to your pom.xml: 将其添加到您的pom.xml:
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<mainClass>pakageName.MainClassName</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
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