Overview

Release Coverage

This section provides comprehensive coverage of all Java releases from the last 5 years (2020-2025), including both LTS (Long-Term Support) and non-LTS releases. While LTS versions are highlighted for production use, non-LTS releases are documented to show feature evolution and preview stages.

Complete release coverage: Java 14, 15, 16, 17 LTS, 18, 19, 20, 21 LTS, 22, 23, and 25 LTS.

LTS Release Strategy

Oracle's Long-Term Support (LTS) strategy provides predictable, stable Java versions for enterprise applications.

Primary LTS Releases

The three major LTS releases from the last 5 years:

Java 17 LTS (September 2021) - Sealed classes, pattern matching preview, enhanced PRNG
Java 21 LTS (September 2023) - Virtual threads, sequenced collections, pattern matching finalized
Java 25 LTS (September 2025) - Stream gatherers, compact headers, performance optimizations

LTS Cadence

Oracle delivers LTS releases every 2 years (reduced from 3 years in 2023):

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timeline
    title Java LTS Release Timeline
    2018 : Java 11 LTS : First post-Java 8 LTS
    2021 : Java 17 LTS : 3-year gap
    2023 : Java 21 LTS : 2-year cadence begins
    2025 : Java 25 LTS : 2-year cadence
    2027 : Java 27 LTS (expected) : 2-year cadence

Why LTS Matters

Long-Term Support provides:

8+ years of security updates and bug fixes
Stability for production applications
Predictable upgrade cycles
Enterprise-ready releases with extensive testing
Ecosystem support from frameworks, libraries, and tools

Feature Evolution

Key features evolve across LTS releases:

Feature	Java 17 (2021)	Java 21 (2023)	Java 25 (2025)
Sealed Classes	✅ Finalized	✅ Available	✅ Available
Pattern Matching	🔬 Preview	✅ Finalized	✅ Enhanced
Virtual Threads	❌ None	✅ Finalized	✅ Optimized
Sequenced Collections	❌ None	✅ Finalized	✅ Available
Stream Gatherers	❌ None	❌ None	✅ Finalized
Compact Headers	❌ None	❌ None	✅ Finalized

Legend:

✅ Finalized - Production-ready
🔬 Preview - Feature complete, requires --enable-preview
❌ None - Not available

Choosing Your LTS Version

For new projects in 2026:

Start with Java 21 - Virtual threads essential for modern concurrency
Consider Java 25 - If cutting-edge performance and latest features needed

For existing applications:

Java 8/11 → Java 17 - Solid foundation, mature ecosystem
Java 17 → Java 21 - Virtual threads unlock massive concurrency
Java 21 → Java 25 - Performance optimization (20-40% gains)

Support Timeline

Version	Release Date	Premier Support Until	Extended Support Until
Java 17	Sep 2021	Sep 2026	Sep 2029
Java 21	Sep 2023	Sep 2028	Sep 2031
Java 25	Sep 2025	Sep 2030	Sep 2033

Note: Oracle provides 8 years of support (5 years premier + 3 years extended).

Non-LTS Releases

Non-LTS releases deliver features every 6 months, often in preview stages before finalizing in LTS versions:

2020: Java 14, Java 15

2021: Java 16

2022: Java 18, Java 19 (Virtual Threads preview)

2023: Java 20

2024: Java 22, Java 23

Why document non-LTS releases? Understanding feature evolution from preview to finalization helps developers anticipate LTS capabilities and make informed decisions.

Indonesian Translation Status

Indonesian (/id/) translations for release highlights are pending. English versions provide complete coverage of all releases from Java 14 to Java 25.

Next Steps

For production systems (LTS focus):

Java 17 Highlights - Foundation features (sealed classes, pattern matching preview)
Java 21 Highlights - Concurrency revolution (virtual threads)
Java 25 Highlights - Performance optimization (compact headers, stream gatherers)

For comprehensive understanding (all releases):

Explore releases chronologically from Java 14 through Java 25 to see complete feature evolution and preview stages.

Overview

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