How Do I Get Java 11 JRE Without a Direct Download?

Getting Java 11 JRE Without Direct Download: Understanding the Java Runtime Environment Shift

Java 11 marked a departure from previous Java versions by discontinuing the standalone JRE download. This has left many users wondering how to obtain the necessary runtime environment.

Oracle's Intentions and JRE Deprecation

Oracle, the developer of Java, no longer anticipates users installing a separate JRE or JDK. Browser-based Java applets and Java Web Start apps are gradually being phased out, eliminating the need for end-users to have a JRE. Java-based applications are expected to incorporate their own Java implementation.

Understanding the OpenJDK Project and Alternatives

The OpenJDK project provides the backbone for various Java implementations. Vendors who wish to distribute Java with their products can obtain the OpenJDK source code and bundle it with their own offerings. This has led to a range of Java 11 implementations available.

Vendor Options for Java 11 Implementations

A flowchart and table presented in the answer provide guidance on choosing a Java 11 vendor based on factors such as compatibility, TCK certification, and commercial support.

Compatibility Concerns

Vendors are required to pass the OpenJDK Community Technology Compatibility Kit (TCK) tests to self-declare compatibility. Additionally, most products based on the OpenJDK project use either the HotSpot engine or OpenJ9 engine, ensuring standard compliance.

While there may be minor technological differences between vendor offerings, such as the choice of JVM, these are unlikely to cause compatibility issues. Vendors have a vested interest in maintaining Java specifications compliance.

Update and Security Patch Considerations

Vendors may decide to release updates or patches more quickly to their paying customers, while free社区产品may take longer to update. However, the Java community consistently collaborates to minimize fragmentation and ensure the availability of fixes and patches for all vendors.

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