卡夫卡Android问题

本文介绍了卡夫卡Android问题的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我无法在Android应用中使用Kafka生产者.我收到以下异常.

I'm not able to use Kafka producer in Android app. I'm getting the below exception.,

Caused by: java.lang.ClassNotFoundException: Didn't find class "javax.management.DynamicMBean" on path: DexPathList[[dex file "/data/data/com.a.kafkaproducer/files/instant-run/dex/slice-zookeeper-3.4.6_8a38f89467d40a18afbd8baad7b29088157e6083-classes.dex", dex file "/data/data/com.a.kafkaproducer/files/instant-run/dex/slice-zkclient-0.8_e811ffc59b2b86f143b12056ea3479df3f628d5a-classes.dex", dex file "/data/data/com.a.kafkaproducer/files/instant-run/dex/slice-support-annotations-25.1.0_c6c37b5425fad5a782cbe7db2279266099bc29a9-classes.dex", dex file "/data/data/com.a.kafkaproducer/files/instant-run/dex/slice-snappy-java-1.1.2.6_848c76c3e0ca3a9ed4d0c95a6eeba1e11cd43625-classes.dex", dex file "/data/data/com.a.kafkaproducer/files/instant-run/dex/slice-slice_9-classes.dex", dex file "/data/data/com.a.kafkaproducer/files/instant-run/dex/slice-slice_8-classes.dex", dex file "/data/data/com.a.kafkaproducer/files/instant-run/dex/slice-slice_7-classes.dex", dex file `at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String) (BaseDexClassLoader.java:56) I/art: at java.lang.Class com.android.tools.fd.runtime.IncrementalClassLoader$DelegateClassLoader.findClass(java.lang.String) (IncrementalClassLoader.java:90) I/art: at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:380) I/art: at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:312) I/art: at java.lang.Class dalvik.system.DexFile.defineClassNative(java.lang.String, java.lang.ClassLoader, java.lang.Object, dalvik.system.DexFile) (DexFile.java:-2) I/art: at java.lang.Class dalvik.system.DexFile.defineClass(java.lang.String, java.lang.ClassLoader, java.lang.Object, dalvik.system.DexFile, java.util.List) (DexFile.java:296) I/art: at java.lang.Class dalvik.system.DexFile.loadClassBinaryName(java.lang.String, java.lang.ClassLoader, java.util.List) (DexFile.java:289) I/art: at java.lang.Class dalvik.system.DexPathList.findClass(java.lang.String, java.util.List) (DexPathList.java:418) I/art: at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String) (BaseDexClassLoader.java:54) I/art: at java.lang.Class com.android.tools.fd.runtime.IncrementalClassLoader$DelegateClassLoader.findClass(java.lang.String) (IncrementalClassLoader.java:90) I/art: at java.lang.Class com.android.tools.fd.runtime.IncrementalClassLoader.findClass(java.lang.String) (IncrementalClassLoader.java:62) I/art: at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:380) I/art: at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:367) I/art: at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:367) I/art: at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:312) I/art: at void org.apache.kafka.clients.producer.KafkaProducer.<init>(org.apache.kafka.clients.producer.ProducerConfig, org.apache.kafkamon.serialization.Serializer, org.apache.kafkamon.serialization.Serializer) (KafkaProducer.java:223) I/art: at void org.apache.kafka.clients.producer.KafkaProducer.<init>(java.util.Properties) (KafkaProducer.java:188) I/art: at void com.nokia.kafkaproducer.Producer.<init>(java.lang.String, java.lang.Boolean) (Producer.java:29) I/art: at void com.nokia.kafkaproducer.MainActivity$1.onClick(android.view.View) (MainActivity.java:35) I/art: at boolean android.view.View.performClick() (View.java:5637) I/art: at void android.view.View$PerformClick.run() (View.java:22429) I/art: at void android.os.Handler.handleCallback(android.os.Message) (Handler.java:751) I/art: at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:95) I/art: at void android.os.Looper.loop() (Looper.java:154) I/art: at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6119) I/art: at java.lang.Object java.lang.reflect.Method.invoke!(java.lang.Object, java.lang.Object[]) (Method.java:-2) I/art: at void com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run() (ZygoteInit.java:886) I/art: at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:776)`

使用以下Gradle依赖项:

Using following Gradle dependencies:

dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { exclude group: 'com.android.support', module: 'support-annotations' }) compile 'com.android.support:appcompat-v7:25.1.0' // mvnrepository/artifact/org.apache.kafka/kafka-clients compile group: 'org.apache.kafka', name: 'kafka-clients', version: '0.10.1.1' testCompile 'junit:junit:3.8.1' }

我正在使用来自 Github存储库

感谢您的帮助 谢谢

推荐答案

kafka客户端库是针对Java Standard Edition开发的，Java Standard Edition是javax.management软件包的一部分.但是，此程序包不是Android使用的Dalvik运行时的一部分，并且仅提供Java SE API的子集.您将需要找到一个包含Kafka使用的类的JAR文件，并将其放在项目的libs文件中.

The kafka clients library is developed against Java Standard Edition, which javax.management package is a part of. However, this package is not part of the Dalvik runtime that Android uses and which only provides a subset of the Java SE APIs. You will need to find a JAR file which contains the classes used by Kafka and put it in the libs file of your project.