The full version string for this update release is 20.0.1+9 (where "+" means "build"). The version number is 20.0.1.

Complete release notes for Java 20 can be found here.

What is Java?

Java is a programming language and software platform. Examples of applications that use Java are numerous and widespread but include web browsers, office applications and even mainstream games like Minecraft are based on Java.

What is Java JDK?

The Java Development Kit (JDK) is the full-featured software development kit for Java developers. It has everything the JRE has, but adds the compiler (javac) and tools (like javadoc and jdb). The JDK allows you to create and compile Java programs.

Is Java free to use?

Yes, Java is free to use under the license. This means anyone can download it for personal or development use at no cost. Oracle does charge for long term support, but this is optional.

IANA Data 2020a

JDK 20.0.1 contains IANA time zone data 2021a. For more information, refer to Timezone Data Versions in the JRE Software.

Security Baselines

The security baselines for the Java Runtime Environment (JRE) at the time of the release of JDK 20.0.1 are specified in the following table:

JRE Family Version = JRE Security Baseline (Full Version String)

  • 20 = 20.0.1+9
  • 17 = 17.0.7+8
  • 11 = 11.0.19+9
  • 8 = 8u371-b11

Keeping the JDK up to Date

Oracle recommends that the JDK is updated with each Critical Patch Update. Use the Security Baseline page to determine the latest version for each release family.

Critical patch updates, which contain security vulnerability fixes, are announced one year in advance on Critical Patch Updates, Security Alerts and Bulletins. It is not recommended to use this JDK (version 20.0.1) after the next critical patch update release, scheduled for July 18, 2023.

What's New

New Features

This section describes some of the enhancements in Java SE 20 and JDK 20. In some cases, the descriptions provide links to additional detailed information about an issue or a change. The APIs described here are provided with the Oracle JDK. It includes a complete implementation of the Java SE 20 Platform and additional Java APIs to support developing, debugging, and monitoring Java applications. Another source of information about important enhancements and new features in Java SE 20 and JDK 20 is the Java SE 20 (JSR 395) Platform Specification, which documents the changes to the specification made between Java SE 17 and Java SE 20. This document includes descriptions of those new features and enhancements that are also changes to the specification. The descriptions also identify potential compatibility issues that you might encounter when migrating to JDK 20.


➜ Support Unicode 15.0 (JDK-8284842)

This release upgrades the Unicode version to 15.0, which includes updated versions of the Unicode Character Database, Unicode Standard Annexes #9, #15, and #29: The java.lang.Character class supports Unicode Character Database, which adds 4,489 characters, for a total of 149,186 characters. These additions include 2 new scripts, for a total of 161 scripts, as well as 20 new emoji characters, and 4,193 CJK (Chinese, Japanese, and Korean) ideographs. The java.text.Bidi and java.text.Normalizer classes support Unicode Standard Annexes, #9 and #15, respectively. The java.util.regex package supports Extended Grapheme Clusters based on the Unicode Standard Annex #29. For more detail about Unicode 15.0, refer to the Unicode Consortium's release note.


➜ Add GarbageCollectorMXBean for Remark and Cleanup Pause Time in G1 (JDK-8297247)

  • A new GarbageCollectorMXBean named "G1 Concurrent GC" has been added to the G1 garbage collector.
  • This GarbageCollectorMXBean reports the occurrence and durations of the Remark and Cleanup garbage collection pauses.

Similar to the "CGC" field from jstat -gcutil, a complete concurrent mark cycle will increase the bean's collection counter by 2, one for the Remark and one for the Cleanup pauses. These pauses now also update the "G1 Old Gen" MemoryManagerMXBean memory pool.