How to Run Java 11 Without a Dedicated JRE?

How to Run Java 11 Despite the Absence of a Dedicated JRE

Unlike previous Java versions, Java 11 does not come with a downloadable JRE. As a result, you may encounter an "no java run-time environment" error when attempting to use Java-based software. While installing a Java 8 JRE is a workaround, this may not be ideal.

Understanding the Change

Oracle's decision to discontinue the JRE stemmed from the phasing out of Java Applets and Java Web Start app delivery. Desktop apps are now expected to bundle their own Java runtime. Oracle's white paper on Java Client Roadmap Update and the Java Is Still Free white paper provide further context.

Options for Running Java 11

Although there is no official Java 11 JRE, several vendors offer Java implementations compatible with Java 11.

Flowchart for Choosing a Vendor

[Flowchart diagram]

Table Mapping Motivations and Vendors

[Table]

Compatibility Concerns

OpenJDK, on which many vendor releases are based, offers a TCK suite for vendors to verify compatibility with Java specifications. However, these declarations are self-reported and may not be independently verified. Vendors with self-declared TCK compliance are indicated in the flowchart above.

Technology differences between vendors can include HotSpot or OpenJ9 engines, as well as the JVM used by Zing and GraalVM. However, these differences should not result in incompatibilities.

Vendors may also differ in the speed of providing updates and patches. Oracle reserves the right to release fixes to paying customers without immediately contributing to the OpenJDK project. Commercial support providers may also prioritize updates for their clients.

Conclusion

While the lack of a dedicated Java 11 JRE may initially present challenges, the Java community remains committed to compatibility and fragmentation prevention. By selecting a vendor using a compatible Java implementation and following the considerations outlined above, you can successfully run Java 11 on your PC.

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