Java 9

Benefits

• Better Performance, Memory Management, Locking, Faster Compilation
• Cleaner design (modular), better encapsulation, smaller deployables

Jigsaw (JDK Refactoring project)

• JLink: Deploy only the parts of Java you really use
• Modular system
• Modul descriptor: modul-info.java in each module

module ch.hsr.test.java9 {
    // modules we are dependent on
    requires javafx.controls; 
    requires javafx.fxml;

    requires ch.hsr.test.java9.services;
    exports ch.hsr.test.java9.private; // public usage 
    exports ch.hsr.test.java9.private to ch.hsr.test.java9.client; // explicit usage 
}

• jdepts tool als helper für die Generierung der module files

Other Features

• Reactive Stream API
• JShell
• Private interface methods
• Convenience factory methods for collections

List.of("aaa", "bbb"); // immutable list
Set.of("aaa", "bbb");
Map.of("key", value, "key2", value2); // only up to 10 entries
Map.ofEntries(
    Map.entry("aa", 123),
    Map.entry("bb", 456)
);

Compatibility

• JavaFX: Supported
• Gradle: Supported (Building Java 9 Modules)
• Lombok: Should be supported (see 985 for details)
• Travis: Should work, try it
• Logback/SLF4J: Supported
• SceneBuilder: Supported
• Guice/Gluon Ignite: Try it
• JUnit: Supported