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Is there any framework/tool which can provide Embedded Kafka instance (Kafka Brokers) without any dependency of spring in Java/Scala?
Can someone please provide a working example of it?
You have several options.
Check out the samples on Confluent examples repo, they use embedded instances of Kafka, ZooKeeper, and Confluent Schema Registry (an example: https://github.com/confluentinc/kafka-streams-examples/blob/65f770c75988afc33d3813a1aa4f9f7818fe81d8/src/test/java/io/confluent/examples/streams/WikipediaFeedAvroExampleTest.java#L51)
TestContainers might be another alternative.
Citrus has also support for that.
If you are using Scala, check out the Embedded Kafka library
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I am working on a spring boot application, Which dependent library to use just to consume and push data to database.
spring-kafka or spring-cloud-stream-binder-kafka
Depends what you need to do.
If you want to move data between topics in the same Kafka cluster, and want to use Kafka Streams Topologies, then you can use the Spring Cloud Stream binder.
That being said, spring-cloud-stream-binder-kafka doesn't have a producer (KafkaTemplate), that comes directly from spring-kafka, so if the goal is only to create a basic producer or topic-listener, then you only should need spring-kafka
Spring cloud stream is built on top of spring kafka.
If you want to integrate with external messaging systems then you should go with spring-cloud-stream-binder-kafka. You can also refer this link.
But if you don't want such integrations and just need good performance then you should go with spring-kafka.
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I am building a messaging app.I found technology needed are MQTT or RabbitMQ. To me both seems doing the same thing in the same way (in terms of subscribing & publishing to a topic).
So basically what is the main difference between these two and what are the advantage of each on other?
That's not really a valid comparison, one is a protocol and the other is an implementation of that protocol
RabbitMQ is a message broker that supports multiple messaging protocols including MQTT, AMQP, STOMP via a plugin architecture
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I am trying to find an example that helps deploy a docker image on the kubernetes cluster from java. I came across fabric8,(http://fabric8.io/) that does this but could not find a specific example or API reference
There is an example of creating a Replication controller here:
https://github.com/fabric8io/kubernetes-client/blob/master/kubernetes-examples/src/main/java/io/fabric8/kubernetes/examples/FullExample.java#L75
Creating a Replication Controller is an indirect but recommended way to create a pod.
A pod has one or more docker containers in it.
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I am looking for an opensource/free load testing tool to test applications over RMI.
I only know the JMeter plugin "JMeter RMI Sampler", but I am looking for another one.
You can try The Grinder, a Java Load Testing Framework.
The Grinder 3 is both open-source and supports RMI protocol:
The Grinder can be used to test RPC and MOM based systems using
protocols such as IIOP, RMI/IIOP, RMI/JRMP, and JMS.
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I'm looking for more and better documentation about snapshots, flow repositories, and flow state serialization in Spring Web Flow. Available docs I've found seem pretty sparse. "Spring in Action" doesn't talk about this. The Spring Web Flow Reference Manual does mention a couple flags here:
http://static.springframework.org/spring-webflow/docs/2.0.x/reference/htmlsingle/spring-webflow-reference.html#tuning-flow-execution-repository
but doesn't really talk about why you would change these settings, usage patterns, etc.
Anyone have a good reference?
did you try out any of these books ?
http://www.ervacon.com/products/swfbook/index.html -- from the original author of WebFlow ?
http://www.amazon.com/Expert-Spring-MVC-Web-Flow/dp/159059584X