Java 15 Features

• Records (Second Preview)
• Hidden Classes
• Sealed Classes (Preview)
• Pattern Matching for instanceof (Second Preview)
• Text Blocks (Standard)
• Remove the Nashorn JavaScript Engine
• Reimplement the Legacy DatagramSocket API
• Disable and Deprecate Biased Locking
• Shenandoah: A Low-Pause-Time Garbage Collector
• Remove the Solaris and SPARC Ports
• Foreign-Memory Access API (Second Incubator)
• Deprecate RMI Activation for Removal