>> java.lang.NoClassDefFound Error You are missing some dependent classes. Two questions:
1. Does the message have more information about what class it couldn't find? 2. What exactly are you putting into your jar file? -Dave -----Original Message----- From: Rahul R04 [mailto:rahul.kuma...@mphasis.com] Sent: Thursday, July 6, 2017 5:29 AM To: users@kafka.apache.org Subject: Using Kafka Producer inside Oracle DB Hi, I am trying to post Messages from Oracle to Kafka broker directly using custom java class for that I uploaded the required library in oracle and calling java function using oracle function/procedure. Basic java function is working fine but function in which Kafka is getting initialized and used throwing uncaught exception. Even I put whole function body inside try-catch block but still not getting my customized exception as message. I am having Oracle 12C that have JVM version 1.8. This message got popup on oracle SQL prompt at java function call (java.lang.NoClassDefFound Error). I created a jar file for my custom classes and uploaded it with it's respected libraries to oracle DB. I uploaded library files using below command. loadjava -u <user>/<Password>@DB -resolve <library>.jar Please tell how to get Kafka Producer initialized and start sending message, from inside oracle My custom classes are given below public class KafkaPublisher { static ProducerRecord<String, String> PR = null; static Producer<String, String> producer = null; static Properties prop = new Properties(); public static void init() { prop.put("bootstrap.servers", "111.11.11.11:9092"); prop.put("acks", "1"); prop.put("retries", "0"); prop.put("batch.size", "16384"); prop.put("linger.ms", "1"); prop.put("buffer.memory", "33554432"); prop.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer"); prop.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer"); } public static String push(String data) { String response = "No responce"; init(); try { producer = new KafkaProducer<String, String>(prop); PR = new ProducerRecord<String, String>("topic1", data); Future<RecordMetadata> future = producer.send(PR); RecordMetadata rMetaData = future.get(); response = "Current Offset: " + rMetaData.offset(); } catch (Exception e) { response = "Message: " + e.getMessage() + " Cause: " + e.getCause(); } return response; } public static String getProperties(String msg) { return "My message: " + msg + prop.toString(); } } ## function getProperties(String msg) is working fine but function push(String data) is not working. Thanks and Regards, Rahul Kumar Information transmitted by this e-mail is proprietary to Mphasis, its associated companies and/ or its customers and is intended for use only by the individual or entity to which it is addressed, and may contain information that is privileged, confidential or exempt from disclosure under applicable law. If you are not the intended recipient or it appears that this mail has been forwarded to you without proper authority, you are notified that any use or dissemination of this information in any manner is strictly prohibited. In such cases, please notify us immediately at mailmas...@mphasis.com and delete this mail from your records. This e-mail and any files transmitted with it are confidential, may contain sensitive information, and are intended solely for the use of the individual or entity to whom they are addressed. If you have received this e-mail in error, please notify the sender by reply e-mail immediately and destroy all copies of the e-mail and any attachments.
