Two JDK Enhancement Proposals (JEPs) were proposed for JDK 13 this week on the OpenJDK jdk-dev mailing list. Mark Reinhold posted these proposals in messages with titles that indicate the JEP topic: "JEP proposed to target JDK 13: 350: Dynamic CDS Archives" and "JEP proposed to target JDK 13: 351: ZGC: Uncommit Unused Memory."
The "Summary" of proposed JEP 350 ["Dynamic CDS Archives"] states, "Extend application class-data sharing to allow the dynamic archiving of classes at the end of Java application execution. The archived classes will include all loaded application classes and library classes that are not present in the default, base-layer CDS archive." JEP 310 introduced "Application Class-Data Sharing" (AKA "AppCDS") via JDK-8185996 and in conjunction with JDK 10.
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