サーブレットを使用してKafkaProducerを接続し、eclipseでプロジェクトをセットアップしようとしています。私はKafkaProducerを実行したときしかし、私は例外を取得:サーブレットを使用してKafkaProducerを接続します
org.apache.catalina.core.StandardWrapperValveはSEVERE呼び出す: のServlet.service()パスを持つコンテキスト でサーブレット[simple_kafka.SimpleProducer] [/ kafka_web]のために例外をスローした根本原因にjava.lang.ClassNotFoundExceptionで[サーブレットの実行が 例外をスロー]: org.apache.catalina.loader.WebappClassLoaderBase.loadClassで org.apache.kafka.clients.producer.KafkaProducer(WebappClassLoaderBase.java:1291 ) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1119) at simple_kafka。 SimpleProducer.doPost(SimpleProducer.java:56)を に設定します。 のjavax.servlet.http.HttpServlet.service(HttpServlet.java:661) org org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) org.apache.tomcat.websocket.serverで でapache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) 。 : org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.javaでWsFilter.doFilter(WsFilter.java:52) でorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) 166) でorg.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) でorg.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) org.apache.catalinaで org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValveで.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478) でorg.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) .java:81) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650) at org.apache.catalina.core.Standard EngineValve.invoke(StandardEngineValve.java:87) でorg.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) でorg.apache.coyote.http11.Http11Processor.service(Http11Processor.java。 で803) org.apache.tomcatで org.apache.coyote.AbstractProtocol $ ConnectionHandler.process(AbstractProtocol.java:868) でorg.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) .util.net.NioEndpoint $ SocketProcessor.doRun(NioEndpoint.java:1459) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at org.apache.tomcat.util.threadsで java.util.concurrent.ThreadPoolExecutor $ Worker.run(ThreadPoolExecutor.java:624) でjava.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) .TaskThread $ WrappingRunnable.run(TaskThread.java:61) (java.lang.Thread.run)(スレッド。Javaの:748)
私KafkaProducerServletは以下の通りである:
package simple_kafka;
import java.io.IOException;
import java.util.Properties;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerConfig;
//import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerRecord;
/**
* Servlet implementation class SimpleProducer
*/
@WebServlet("/producer")
public class SimpleProducer extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public SimpleProducer() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
// response.getWriter().append("Served at: ").append(request.getContextPath());
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
response.getWriter().append("Served at: ").append(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG);
String topicName = "ReplicaTopic";
String key = "Key1";
String value = "Value-1";
Properties props = new Properties();
props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.1.59:9092,192.168.1.59:9093");
props.put("key.serializer","org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
KafkaProducer<String, String> producer = new KafkaProducer <String, String>(props);
try {
ProducerRecord<String, String> record = new ProducerRecord<>(topicName,key,value);
producer.send(record);
producer.close();
}
catch(Exception e) {
response.getWriter().append("Exception at: ").append((CharSequence) e);
}
// response.sendRedirect("/consumer");
}
}
私はJARのプロジェクト・プロパティのビルドパスに次の含まれていました:
- カフカ2.12-0.11.0.1.jar
- kafka-clients-0.11.0.1.jar
- slf4j-api-1.7.25.jar