JEP 539: Preview Feature Introduces Strict Field Initialization in the JVM to Eliminate Default Value Observations
By
za3faran
Summary
JEP 539 introduces strictly-initialized fields in the Java Virtual Machine as a preview feature. These fields must be initialized before being read, preventing default values like 0 or null from ever being observed. For strictly-initialized fields that are also final, the same value is always guaranteed to be observed. This is a preview VM feature designed for use by compilers that emit class files, aiming to eliminate the possibility of reading uninitialized memory in Java programs.
Source
Hacker NewsJEP 539: Preview Feature Introduces Strict Field Initialization in the JVM to Eliminate Default Value Observationsopenjdk.orgKey quotes
· 5 pulledIntroduce strictly-initialized fields in the Java Virtual Machine.
Such fields must be initialized before they are read, thus default values such as 0 or null are never observed.
For strictly-initialized fields that are final, the same value is always observed.
This is a preview VM feature, available for use by compilers that emit class files.
The Java Platform specifies that every variable is initialized before use, ensuring that a program can never read from uninitialized memory.
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