1. NoRedeploys
Instant
updates
for
dev
and
prod
Anton
Arhipov
Product
Lead,
JRebel
@antonarhipov
@javarebel
Saturday, April 21, 12

2. !!!WARNING!!!
Saturday, April 21, 12

3. Turnaround
cycle
Make
a
change
Check
Build,
the
deploy,
result wait
Saturday, April 21, 12

4. Build
Resolve
dependencies
Copy
staGc
resources
Compile
classes
Package
modules
into
JARs
Package
everything
into
WAR/EAR
Saturday, April 21, 12

5. Build
Resolve
dependencies
Copy
staGc
resources
Compile
classes
Package
modules
into
JARs
Package
everything
into
WAR/EAR
Saturday, April 21, 12

6. Exploded
Directory
Deployment
Saturday, April 21, 12

7. Exploded
Directory
Deployment
Saturday, April 21, 12

8. JeAy
Launcher
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();
}
}
Saturday, April 21, 12

9. Deployment
1–60s 30s
–
15min ~1min
applicaBon
deployment
container
boot
Bme
navigaBon
Saturday, April 21, 12

10. Deployment
1–60s 30s
–
15min ~1min
OOM
applicaBon
deployment
container
boot
Bme
navigaBon
Saturday, April 21, 12

11. OutOfMemoryError
DEMO
Saturday, April 21, 12

12. Externalized, Temporary,
State%
Serializable, Deriva6ve,
Saturday, April 21, 12

13. Reloading
Classes
OldClassLoader
MyObject.class
MyObject
Saturday, April 21, 12

14. Reloading
Classes
OldClassLoader NewClassLoader
MyObject.class
MyObject
Saturday, April 21, 12

15. Reloading
Classes
OldClassLoader NewClassLoader
MyObject.class MyObject.class
Recreate
object
MyObject MyObject
Saturday, April 21, 12

16. Web
ApplicaBon
Redeployment
Process
Session
Classes Servlet
State
Libraries
OldClassLoader
Saturday, April 21, 12

17. Web
ApplicaBon
Redeployment
Process
Session
Classes Servlet
State
Libraries
OldClassLoader NewClassLoader
Saturday, April 21, 12

18. Web
ApplicaBon
Redeployment
Process
Session
Classes Servlet Classes
State
Libraries Libraries
OldClassLoader NewClassLoader
Saturday, April 21, 12

19. Web
ApplicaBon
Redeployment
Process
Session
Classes Servlet Classes Servlet
State
Libraries Libraries
OldClassLoader NewClassLoader
Saturday, April 21, 12

20. Web
ApplicaBon
Redeployment
Process
init()
Session
Classes Servlet Classes Servlet
State State
Libraries Libraries
OldClassLoader NewClassLoader
Saturday, April 21, 12

21. Web
ApplicaBon
Redeployment
Process
Serialize/deserialize
Session Session
Classes Servlet Classes Servlet
State State
Libraries Libraries
OldClassLoader NewClassLoader
Saturday, April 21, 12

22. Web
ApplicaBon
Redeployment
Process
Session Session
Classes Servlet Classes Servlet
State State
Libraries Libraries
OldClassLoader NewClassLoader
Saturday, April 21, 12

23. Web
ApplicaBon
Redeployment
Process
Session
Classes Servlet
State
Libraries
NewClassLoader
Saturday, April 21, 12

24. Web
ApplicaBon
Redeployment
Process
Session Session
Classes Servlet Classes Servlet
State State
Libraries Libraries
OldClassLoader NewClassLoader
Saturday, April 21, 12

25. OutOfMemoryError
Simulation
Saturday, April 21, 12

26. hAp://zeroturnaround.com/java-­‐ee-­‐producBvity-­‐report-­‐2011/
Saturday, April 21, 12

27. HotSwap
Make
changes
in
IDE
ClassLoader
MyObject.class
Code
101000101 HotSwap
100010010 New
code
111000100
101010010
MyObject
Saturday, April 21, 12

28. JRebel
Make
changes
in
IDE
ClassLoader
MyObject.class
Code
101000101
New
code
JRebel
100010010
111000100
101010010
MyObject
Saturday, April 21, 12

29. Hotswap
vs
JRebel
JRebel&vs&HotSwap&
Hotswap
HotSwap( JRebel
JRebel(
Changing&method&bodies& +( +(
Adding/removing&methods& ;& +&
Adding/removing&constructors& ;& +&
Adding/removing&fields& ;& +&
Adding/removing&classes& ;& +&
Adding/removing&annota?ons& ;& +&
Replacing&superclass& ;& ;&
Adding/removing&implemented& ;& ;&
interfaces&
Saturday, April 21, 12

30. JRebel
Make
changes
in
IDE
ClassLoader
MyObject.class
Code
101000101
New
code
JRebel
100010010
111000100
101010010
MyObject
Saturday, April 21, 12

31. JRebel
Make
changes
in
IDE
ClassLoader
Framework
MyObject.class
Code
101000101
New
code
JRebel
100010010
111000100
101010010
MyObject
Saturday, April 21, 12

32. JRebel
Make
changes
in
IDE
ClassLoader
Framework
MyObject.class
Code
101000101
New
code
JRebel
100010010
111000100
101010010
MyObject
ConfiguraGon
(XML,
annotaGons,..)
Saturday, April 21, 12

33. getResource(“hello.html”) read(“src/main/.../hello.html”)
virtual
mapping
MyApp.war
Saturday, April 21, 12

34. in
acBon
Saturday, April 21, 12

35. JRebel
IntegraBon
hAp://zeroturnaround.com/jrebel/features/frameworks/
Saturday, April 21, 12

36. What
About
Live
Environments?
Saturday, April 21, 12

37. Saturday, April 21, 12

38. Saturday, April 21, 12

39. • LiveRebel
updates
are
– Online
– Automated
– TransacBonal
– 100%
Reversible
– Instant
Saturday, April 21, 12

40. ? 32
Saturday, April 21, 12