This Annex to the Java SE 21 Specification contains the Java SE 21 version of the JAR File Specification. The JAR File Specification underpins the java.util.jar API.

The Java SE 21 version includes corrections and clarifications made to the JAR Spec since the Java SE 20 version, that is, since the Final Release of JSR 395. These changes are flagged with colorful text, as follows:

• Text with light green background indicates new material in the Java SE 21 version.
• Text struck through on a light red background indicates deletion from the Java SE 20 version.

Informative background for these changes may be found in the following approved Change Specification Review (CSR) request:

• Remove JAR Index
  Compatibility & Specification Review