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What is clustering in Java? 

Clustering in Java is a technique where multiple Java servers (or instances) work together as a group, called a "cluster", to handle requests. This helps improve performance, reliability, and allows the application to keep running even if one server fails. In simple words, clustering lets many servers share the work and back each other up, making Java applications faster and more reliable.

Examples of clustering in Java:

1: Web servers: Multiple Tomcat servers running together in a cluster to handle more website visitors and share the load.

2: Application servers: Java EE servers like JBoss or WebLogic use clustering to provide high availability and failover support for enterprise applications.

3: Distributed caching: Tools like Hazelcast or Apache Ignite use clustering to store and share data across many Java servers, so data is always available even if one server goes down.

4: Microservices: In a microservices architecture, Java-based services are often clustered to ensure continuous service and better performance.

These examples show how clustering helps Java applications handle more users, avoid downtime, and work more efficiently.