JDK 15 - The new features in Java Open JDK 15

The new features in Java Open JDK 15, next version of Java SE on June 11:

• A preview of sealed classes.
• A second incubator of a foreign-memory access API.
• Cryptographic signatures based on the Edwards-Curve Digital Signature Algorithm (EdDSA).
• Reimplementing the legacy DatagramSocket API.
• A second preview of pattern matching for instanceof.
• Disabling biased locking by default and deprecating all related command-line options.
• Hidden classes.
• The ZGC: A Scalable Low-Latency Garbage Collector (ZGC).
• Text blocks.
• Removal of Nashorn.
• Deprecation of the RMI Activation mechanism.