JREBEL FOR ECLIPSE ECLIPSE DAY CHINA 2013. PRESENTER ANTON PRODUCT MANAGER.

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Presentation transcript:

JREBEL FOR ECLIPSE ECLIPSE DAY CHINA 2013

PRESENTER ANTON PRODUCT MANAGER

BASED ON JAVAAGENT TECHNOLOGY DISTRIBUTED AS IDE PLUGIN Eclipse, incl. MyEclipse, RAD, etc Also: IntelliJ IDEA, NetBeans, JDeveloper A PRODUCTIVITY TOOL FOR JAVA DEVELOPERS

THE TURNAROUND MAKE CHANGES MAKE CHANGES BUILD, DEPLOY, WAIT OBSERVE RESULTS AVERAGE: 2.5 min

THE TURNAROUND MAKE CHANGES MAKE CHANGES BUILD, DEPLOY, WAIT OBSERVE RESULTS NO BUILD! NO REDEPLOY! NO WAITING!

~1 min30 sec – 30 min1-60 sec IN-APPLICATION NAVIGATION APPLICATION STARTUP SERVER STARTUP WASTED TIME

HOW TO RELOAD A CLASS? Old Class Loader MyClass MyObject New Class Loader MyClass’ MyObject TRANSFER THE STATE

Classes Libraries OldClassLoader NewClassLoader Sevlet New Classes New Libraries Sevlet Session init() App State serialize/deserialize THIS IS WHAT EVERY APPLICATION SERVER DOES

Classes OldClassLoader NewClassLoader Sevlet New Classes New Libraries Sevlet Session App State CLASS LOADERS ARE EASY TO LEAK!

THE REALITY: CLASS LOADERS ARE NOT GOOD FOR RELOADING CLASSES

MyObject MyObject.class OldClassL oad er Code Debugger HotSwap New code New code HotSwap Make changes

JRebel vs HotSwap HotSwapJRebel Changing method bodies ++ Adding/removing methods -+ Adding/removing constructors -+ Adding/removing fields -+ Adding/removing classes -+ Adding/removing annotations -+ Replacing superclass * -- Adding/removing implemented interfaces * --

Maybe one day Java gets a better HotSwap: – JEP 159: Enhanced Class Redefinition But class reloading is not enough for real applications!

MyObject MyObject.class OldClassL oad er Code New code JRebel Framework Configuration (XML, annotations,..) JRebel Make changes

JRebel does NOT create new class loaders to update classes!

DEMO TIME!

GET AT ECLIPSE MARKETPLACE

ADD JREBEL NATURE

ENABLE JREBEL AGENT

JREBEL CONFIG CENTER

By starting the container you will see JRebel messages like below

REBEL.XML JRebel monitors directories specified in rebel.xml

INSTANT CLASS RELOADING JRebel reloads only what’s changed

FRAMEWORK CONFIGURATIONS JRebel understands framework configuration files