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Knowledge sharing session Java 9
- 1. Overview THOMAS ENGELS – CONSULTANT – G36
- 2. Planning New features Improved-extend features Deprecated-removed features Review Java 10
- 3. New features
- 4. Most important features Modularity Incubator Jshell Jlink G1 HTTP 2 Flow API http://jdk.java.net/9/release-notes
- 5. Modularity Planned for java 7 Makes internal JDK api’s inaccessible “Biggest” change since existance of JAVA
- 6. Why? No need to run full JDK only modules you need Encapsulate most internal APIs Increase maintainability can’t use internal-not exposed public methods
- 7. Declaration Module-info.java Requires (transitieve) Exports (to) Uses Opens Provides … with …
- 8. Demo
- 9. Incubator Non final APIs Finalized or removed in future release No “lifecycle” strategy No @deprecated Warning at run time
- 10. Jlink Tool to assemble and optimize modules and their dependencies into a custom run-time image. Reduces run time & footprint performance Unused code is know at link time (not yet implemented) Plugin optimization and expansion after release use JLINK modules obligated
- 11. Compile Link (optional) run Link time to do whole-world optimizations instead of at compile time or costly at run-time.
- 12. JShell Java read-eval-print loop tool Test code without creating project Prototyping
- 13. Demo
- 14. Garbage collection in JVM Currently 4 Serial Garbage Collector Parallel Garbage Collector (current default) CMS Garbage Collector G1 Garbage Collector Remove less used GC combinations DefNew + CMS ParNew + SerialOld Incremental CMS
- 15. G1 Garbage first >=JDK7 update 4 Replaces CMS (deprecated) more efficient java -XX:+UseG1GC -jar Application.java
- 16. How G1 works Parallel Partial Less pause / more frequently Large heaps
- 17. HTTP client en HTTP2 WHO EVER USED javav.net.HTTPURLConnection?
- 18. HTTPClient Features Incubating Feature websockets Builder Http2 support Why URLConnection multiple protocols API too abstract blocking mode only
- 19. What is HTTP/2 Same as HTTP 1.1 Request/response based All http calls work Different then HTTP 1.1 Binary protocol http 2 is TLS only (browser) Multiplex over single connection Server push capability
- 20. Demo
- 21. Flow API reactive programming Publisher Subscriber Subscription Processor No implementation in jdk
- 22. Demo
- 23. smallthings Collection factory methods Private methods in Interfaces Stream methods
- 24. Demo
- 25. Java doc Improved search No need to return to Google HTML5 compliant Java 9 doc
- 26. Deprecated/Removed Finalize() Boxed primitive constructors valueOf(int) parseInt(String) ‘_’ reserved keyword Jhat Launch-time JRE version selection GC combinations
- 27. Java 9 review Good Platform more mature Faster releases Bad No long term support more, More, MORE not-platform specific community JAVA still OOP? Unnecessary methods
- 28. Java 10 ~ Project Valhalla Incubator module like HTTP2 Value types Generic specialization Reified generics Improved volatile support
Editor's Notes
- Exports: while this allow other modules to read everything in the package, all subpackage remain sealed. Exports to, is to share with specific modules but not with the rest Requires: we have a dependencie on another module (MODULE, not package) If we want to make it available to other modules by requiring our module: require transitive Provides, exponse an interface, but hide the implementation Uses used to indicate the service interface that this module is using; a type name, i.e., complete class/interface name, has to specified after this keyword Opens: is used to indicate the packages that are accessible only at runtime
- They have to use the add-modules commandline options to request that an incubator module be resolved.
- Java always had dynamic linking. You can decrease the size of deployment with custom run-time image.
- defines link time as an optional phase between the phases of compile time (the javac command) and run-time (the java run-time launcher). Link time requires a linking tool that will assemble and optimize a set of modules and their transitive dependencies to create a run-time image or executable.
- /import shows all imports /vars show all variables /methods
- Concurrent multi threaded GC Offer more predictable pause times
- Is stop the world scenario still applicable The garbage in every region is tracked an the one with the most gabrage is cleared first
- More more more Client, jdbc, jpa Factory methods -> static, less constructors Java is getting overbloded with features, and it’s kind of ugly. But now matter how tangled, nasty and less OOP java gets. I iwll never switch to C#.