Overview

Kundera is a "Polyglot Object Mapper" with a JPA interface. The idea behind Kundera is to make working with NoSQL Databases drop-dead simple and fun. Kundera is being developed with following objectives:

• To make working with NoSQL as simple as working with SQL
• To serve as JPA Compliant mapping solution for NoSQL Datastores.
• To help developers, forget the complexity of NoSQL stores and focus on Domain Model.
• To make switching across data-stores as easy as changing a configuration.

Latest

• Ethereum public data can be stored to any database of your choice. Check Kundera with Ethereum for more details.
• Kundera now supports RethinkDB. Check Kundera with RethinkDB for more details.
• Kundera supports Apache Kudu. Check Kundera with Kudu for more details.
• Want to step out of JPA world and still take advantage of Kundera? Check Kundera Data as Object.
• Want to save your large files in MongoDB GridFS in the same JPA way. Check GridFS support in Kundera.
• Perform SQL queries over big data using Kundera with Apache Spark as the query engine. Check Kundera with Spark for more details.
• We are active on stackoverflow.com. Ask questions & check existing Kundera Tagged Questions on stackoverflow.

Supported Datastores

Kundera currently supports following data stores :

• Cassandra
• MongoDB
• HBase
• Redis
• OracleNoSQL
• Neo4j
• Couchdb
• RethinkDB
• Kudu
• Relational databases
• Apache Spark

You can find the list of data stores(specific versions) supported by Kundera here.

Getting Started

The latest stable release of Kundera is 3.12. It is a maven based project . You can either download it directly from github and build using following command :

mvn clean install -Dfile src/pom.xml

Or it can be directly added as maven dependency in your project in the following manner :

• Add the following repository to pom.xml :

 <repository>
     <id>sonatype-nexus</id>
     <name>Kundera Public Repository</name>
     <url>https://oss.sonatype.org/content/repositories/releases</url>
    <releases>
        <enabled>true</enabled>
    </releases>
    <snapshots>
        <enabled>false</enabled>
    </snapshots>
 </repository>

• Add the data store specific Kundera module as a dependency (e.g. Cassandra below) :

  <dependency>
        <groupId>com.impetus.kundera.client</groupId>
        <artifactId>kundera-cassandra</artifactId>
        <version>${kundera.version}</version>
  </dependency>

Build your project with the above changes to your pom.xml and start using Kundera !

Important Links

• Kundera in 5 minutes
• Data Store specific Configurations
• Features :
  • Polyglot Persistence
  • JPQL & Native Query Support
  • Schema Generation
  • Transaction Management
  • Rest Based Access
  • Aggregation over NoSQL
• Tutorials :
  • Kundera with Openshift
  • Kundera with Play Framework
  • Kundera with GWT
  • Kundera with JBoss
  • Kundera with Spring
  • Kundera with Spark
• Kundera Tagged Questions on stackoverflow.com
• Releases

Troubleshooting

• Common Issues and Troubleshooting

Sample Projects

• kundera-mongodb-kudu-example.zip (MongoDB - Kudu polyglot)
• kundera-cassandra-example.zip
• kundera-mongodb-example.zip
• kundera-hbase-example.zip

Contribution

• Contribution Ideas
• Contribution Guidelines

About Us

Kundera is backed by Impetus Labs - iLabs. iLabs is a R&D consulting division of Impetus Technologies. iLabs focuses on innovations with next generation technologies and creates practice areas and new products around them. iLabs is actively involved working on High Performance computing technologies, ranging from distributed/parallel computing, Erlang, grid softwares, GPU based software, Hadoop, Hbase, Cassandra, CouchDB and related technologies. iLabs is also working on various other Open Source initiatives.

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