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reloading java applications like a pro Anton  Arhipov  

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whoami anton arhipov @antonarhipov jrebel product lead zeroturnaround

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agenda • the time sink • application updates (with jrebel)

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make a change build, deploy, wait check the change the turnaround

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package everything into WAR/EAR rackage modules into JARs compile classes copy static resources resolve dependencies build

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exploded directory deployment

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public class Launcher { public static void main(String[] args) { Server server = new Server(); SelectChannelConnector connector = new SelectChannelConnector(); connector.setPort(8080); server.addConnector(connector); WebAppContext context = new WebAppContext("war", "/"); server.setHandler(context); server.start(); } } jetty launcher

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“…I  know  about  JRebel,  but  I  cannot   pay  for  it,  so  I  tried  Maven…”                                                                                        -­‐  Stackoverflow  

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getResource(“hello.html”)   read(“src/main/.../hello.html”)  

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package everything into WAR/EAR rackage modules into JARs compile classes copy static resources resolve dependencies build

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package everything into WAR/EAR rackage modules into JARs compile classes copy static resources resolve dependencies build

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no build! • compile with your IDE • prefer exploded deployment • avoid <>

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1–60s 30s$–$15min ~1min container boot time application deployment navigation redeploy’s time

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h@p://dow.ngra.de/2010/12/14/jee-­‐oss-­‐container-­‐startup-­‐Jmes-­‐apples-­‐vs-­‐oranges/   container startup time

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h@p://zeroturnaround.com/java-­‐ee-­‐producJvity-­‐report-­‐2011/  

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Externalized   Temporary   Serializable   DerivaJve   State   why code reloading is hard?

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MyObject   MyObject.class   OldClassLoader   NewClassLoader   MyObject.class   MyObject   Recreate  object   naiive class reloading

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Classes Libraries OldClassLoader NewClassLoader Sevlet New Classes New Libraries Sevlet Session Session init()   App State App State serialize/deserialize

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Classes OldClassLoader NewClassLoader Sevlet New Classes New Libraries Sevlet Session Session App State App State

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MyObject MyObject.class   OldClassLoader Code   101000101   100010010   Debugger HotSwap   New  code   111000100   101010010   New  code   111000100   101010010   hotswap Make  changes  

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MyObject MyObject.class   OldClassLoader Code   101000101   100010010   New  code   111000100   101010010   JRebel   Framework   ConfiguraJon   (XML,  annotaJons,..)   jrebel Make  changes  

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HotSwap   JRebel   Changing  method  bodies   +   +   Adding/removing  methods   -­‐   +   Adding/removing  constructors   -­‐   +   Adding/removing  fields   -­‐   +   Adding/removing  classes   -­‐   +   Adding/removing  annotaJons   -­‐   +   Replacing  superclass   -­‐   -­‐   Adding/removing  implemented   interfaces   -­‐   -­‐   jrebel vs hotswap

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in action

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Java App Framework Conf XML HTTP request

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Java App Framework Conf XML HTTP request 1) Stop request

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Java App Framework Conf XML HTTP request 2) Check resources

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Java App Framework Conf XML HTTP request 3) Reconfigure the framework

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Java App Framework Conf XML HTTP request 4) Resume request

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Java App Framework Conf XML HTTP request PROFIT! J

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Java App Framework Conf XML HTTP request OpJonally:   File  system     PUSH  

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No content

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application reloading is hard • requires more than just class reloading • reloading of different components should appear in particular order • bootstrapping

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with java ee

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jrebel for java ee • JSP • JAX-RS • JAX-WS • JSF • CDI • JPA • EJB • Jasper • Jersey, CXF • Metro • Mojarra, MyFaces • Weld • EclipseLink, OpenJPA, Hibernate

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goes cloud

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Remote Deployments • Development servers • Virtualized environments • Cloud environments

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Remote Deployments 0. make a change 1. git commit; git push 2. mvn clean install 3. deploy.sh

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0. make a change 1. compile 2. synch & reload

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h@p://bit.ly/33degree2013     win a free license

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Questions? @antonarhipov [email protected]