OpenJDK Java Development Kit

This is a repackaged open source software product wherein additional charges apply for cloudimg support services.

## Production-Ready OpenJDK with Expert Support on AWS

OpenJDK is the leading open-source implementation of the Java Platform, Standard Edition. This AMI delivers OpenJDK pre-configured on Oracle Linux 8, giving your team immediate access to a fully operational Java development and runtime environment - backed by cloudimg's 24/7 expert support with a guaranteed 24-hour response SLA.

## Why Choose This Over Free Alternatives?

Free JDK distributions like Amazon Corretto or AdoptOpenJDK provide the runtime but leave you on your own when production issues arise at 2 AM. With cloudimg support, you get:

• Application-level troubleshooting - Not just OS or JDK installation issues, but help diagnosing your Java application problems including memory leaks, thread deadlocks, and performance degradation
• GC tuning consultations - Expert guidance selecting and configuring the right garbage collector (G1GC, ZGC, Shenandoah) for your specific workload characteristics
• Migration assistance - Hands-on help migrating from Oracle JDK commercial licensing to OpenJDK without disrupting production
• Oracle Linux 8 as a deliberate choice - Enterprise-grade OS with long-term support, binary compatibility with RHEL, and proven stability for Java workloads

## Included Java Versions

• OpenJDK 17 LTS - Long-term support with security updates and stability
• OpenJDK 21 LTS - Latest LTS release with virtual threads and pattern matching
• OpenJDK 23 - Current release with newest language features

All three versions are installed side-by-side. Switch between them using Java alternatives with a single command.

## Getting Started in Minutes

1. Launch the AMI on your preferred EC2 instance type (t3.medium or larger recommended)

2. SSH into the instance on port 22 using your key pair

3. Run'java -version' to confirm the active JDK version

4. Use 'sudo alternatives --config java' to select between JDK 17, 21, or 23

5. Begin compiling and running Java applications immediately

Prerequisites: An EC2 key pair and a security group allowing inbound TCP port 22 for SSH access.

## Complete Development Toolkit

• Java Compiler (javac) - Compile source code with full syntax checking, type checking, and annotation processing
• JVM Runtime (HotSpot) - Just-in-time compilation, adaptive optimization, and runtime profiling for peak performance
• Standard Libraries - Collections framework, concurrency utilities, networking, JDBC database access, security APIs, and more
• Diagnostic Tools - jconsole, jstack, jmap, jstat, Java Flight Recorder for monitoring and troubleshooting

## Garbage Collection Options

Choose the right GC strategy for your workload:

• G1GC - Balanced throughput and latency for general workloads
• ZGC - Sub-millisecond pause times for latency-sensitive applications
• Shenandoah GC - Concurrent compaction for consistent response times
• Parallel GC - Maximum throughput for batch processing

cloudimg support engineers can help you select and tune the optimal collector for your specific application profile.

## AWS Integration

• Optimized for EC2 instance types including compute and memory-optimized families
• Compatible with AWS CloudWatch for monitoring JVM metrics
• Works with AWS Systems Manager for fleet management
• AWS SDK for Java ready for cloud-native development
• Auto Scaling group compatible for elastic workloads
• EBS-optimized storage support

## Example Use Case

A development team running20+ Spring Boot microservices on EC2 needs consistent JDK patching across all environments without dedicating an engineer to Java platform maintenance. They deploy this AMI across dev, staging, and production, use cloudimg support for quarterly GC tuning reviews, and rely on the24-hour SLA when unexpected OutOfMemoryErrors surface during peak traffic. The result: their developers focus on application code while cloudimg handles JDK-level concerns.

##24/7 cloudimg Support Includes

• Phone, email, and chat support available 365 days per year
• Guaranteed 24-hour response time SLA
• OpenJDK version migration guidance
• JVM performance tuning and GC optimization
• Application-level Java troubleshooting
• Security patch notifications and guidance

This AMI is a repackaged upstream distribution provided by cloudimg. OpenJDK trademarks are the property of their respective owners.