Are Websphere or Weblogic appropriate for your project? Too big" ? Do Jetty or Tomcat actually meet your needs? Too "small"? Neither too big nor too small. What you need is "just enough app server" to support only the subset of APIs and services your application needs.

1. Just Enough App Server
by antonio goncalves
@agoncal

2. 2@agoncal
Antonio Goncalves

3. Take what you need from
Java EE
and resize your App Server

4. 4@agoncal
How do we see Java EE App Servers ?
One Monolith !
Slow
Fat
Heavyweight
Old
Not sexy
Boring

5. App servers are
monolithic !

6. 6@agoncal
Java EE

7. 7@agoncal
Web Profile

8. 8@agoncal
Servlets

9. 9@agoncal
Three types of Java EE App Servers
Three Monoliths !

10. 10@agoncal
Bits & Pieces

11. 11@agoncal
Servlets
JSP
Expression
Language
Servlets
JSTL

12. 12@agoncal
Web Profile
JSP
Expression
Language
Servlets
JSTL
Interceptors JAX-RS
JSON-P
CDI
JPAWebSocket
JTA
Bean Validation

13. 13@agoncal
Java EE
JSP
Expression
Language
Servlets
JSTL
Interceptors JAX-RS
JSON-P
CDI
JPAWebSocket
JTA
Bean Validation
JMSJSFJAX-WS EJB
JavaMail
JCA
Concurrency
Batch
JASPIC

14. 14@agoncal
JVM
JSP
Expression
Language
Servlets
JSTL
Interceptors JAX-RS
JSON-P
CDI
JPAWebSocket
JTA
Bean Validation
JMSJSFJAX-WS EJB
JavaMail
JCA
Concurrency
Batch
JASPIC
JVM

15. 15@agoncal
JVM
JTA
JMS
JSP
Interceptors JAX-RS
Expression
Language
JSF
Servlets
JSON-P
CDI
JAX-WS
JPA
Bean Validation
EJB
JavaMail
WebSocket
JSTL
JCA
Concurrency
Batch
JASPIC
JDBC JNDI Logging JAX-B JMX
Commons
Annotations

16. 16@agoncal
Your own app
JTA
JMS
JSP
Interceptors JAX-RS
Expression
Language
JSF
Servlets
JSON-P
CDI
JAX-WS
JPA
Bean Validation
EJB
JavaMail
WebSocket
JSTL
JCA
Concurrency
Batch
JASPIC
JDBC JNDI Logging JAX-B JMX
Commons
Annotations
My code

17. 17@agoncal
Your own app dependencies
JTA
JMS
JSP
Interceptors JAX-RS
Expression
Language
JSF
Servlets
JSON-P
CDI
JAX-WS
JPA
Bean Validation
EJB
JavaMail
WebSocket
JSTL
JCA
Concurrency
Batch
JASPIC
JDBC JNDI Logging JAX-B JMX
Commons
Annotations
My code SLF4J Angular ReactPrimefaces Bootstrap JQuery

18. App servers are
slow !

19. 19@agoncal
Startup time of App Servers

20. 20@agoncal
Startup time of JBoss
Using a Windows XP virtual machine (Virtual Box)
3.2.8 4.2.3 5.1 6.1 7 Beta
0
5
10
15
20
25
30
35
40
Startup time
Specs

21. App servers
consume resources !

22. 22@agoncal
Memory consumption of App Servers

23. App servers use
outdated packaging !

24. 24@agoncal
Your own app… needs packaging
JTA
JMS
JSP
Interceptors JAX-RS
Expression
Language
JSF
Servlets
JSON-P
CDI
JAX-WS
JPA
Bean Validation
EJB
JavaMail
WebSocket
JSTL
JCA
Concurrency
Batch
JASPIC
JDBC JNDI Logging JAX-B JMX
Commons
Annotations
My code SLF4J Angular ReactPrimefaces Bootstrap JQuery

25. 25@agoncal
Skinny War
JTA
JMS
JSP
Interceptors JAX-RS
Expression
Language
JSF
Servlets
JSON-P
CDI
JAX-WS
JPA
Bean Validation
EJB
JavaMail
WebSocket
JSTL
JCA
Concurrency
Batch
JASPIC
JDBC JNDI Logging JAX-B JMX
Commons
Annotations
My code SLF4J Angular ReactPrimefaces Bootstrap JQuery

26. 26@agoncal
My code
Fat War
JTA
JMS
JSP
Interceptors JAX-RS
Expression
Language
JSF
Servlets
JSON-P
CDI
JAX-WS
JPA
Bean Validation
EJB
JavaMail
WebSocket
JSTL
JCA
Concurrency
Batch
JASPIC
JDBC JNDI Logging JAX-B JMX
Commons
Annotations
SLF4J
Apache
Commons
Drools SLF4J Angular React

27. Demo
CD-BookStore
Top Books
Top CDs
https://github.com/agoncal/agoncal-sample-javaee/06-EnoughAppServer

28. 3 apps
3 different needs !

29. 29@agoncal
CD-Book Store
JTA
JMS
JSP
Interceptors JAX-RS
Expression
Language
JSF
Servlets
JSON-P
CDI
JAX-WS
JPA
Bean Validation
EJB
JavaMail
WebSocket
JSTL
JCA
Concurrency
Batch
JASPIC
JDBC JNDI Logging JAX-B JMX
Commons
Annotations
My code Primefaces Bootstrap JQuery

30. 30@agoncal
Top Books
JTA
JMS
JSP
Interceptors JAX-RS
Expression
Language
JSF
Servlets
JSON-P
CDI
JAX-WS
JPA
Bean Validation
EJB
JavaMail
WebSocket
JSTL
JCA
Concurrency
Batch
JASPIC
JDBC JNDI Logging JAX-B JMX
Commons
Annotations
My code

31. 31@agoncal
Top CDs
JTA
JMS
JSP
Interceptors JAX-RS
Expression
Language
JSF
Servlets
JSON-P
CDI
JAX-WS
JPA
Bean Validation
EJB
JavaMail
WebSocket
JSTL
JCA
Concurrency
Batch
JASPIC
JDBC JNDI Logging JAX-B JMX
Commons
Annotations
My code

32. What a Waste !
Let's package what we need…
...in a “uber” Jar

33. 33@agoncal
My code
CD-Book Store
JTAInterceptors
JAX-RS
Expression
Language
JSF
Servlets
JSON-PCDI
JPA
Bean Validation
EJB
JDBC JNDI Logging JAX-B
Commons
Annotations
Primefaces Bootstrap JQuery

34. 34@agoncal
My code
Top Books
JTAInterceptors
Expression
Language
Servlets
JSON-PCDI
JPA
Bean Validation
JDBC JNDI Logging JAX-B
Commons
Annotations
JAX-RS

35. 35@agoncal
My code
Top CDs
Servlets
Commons
Annotations
Logging

36. 36@agoncal
Several solutions to choose from
● Full Java EE
●
WildFly Swarm
● Payara Micro
●
TomEE
● KumuluzEE
● “Sort of” Java EE
● Spring Boot
● Other
● Dropwizard
●
Lagom

37. Demo
WildFly Swarm
https://github.com/agoncal/agoncal-sample-javaee/06-EnoughAppServer

38. And what about multiple apps ?

39. 39@agoncal
My code
Top CDsssssssss
Servlets
Commons
Annotations
Logging
My code
Servlets
Commons
Annotations
Logging
My code
Servlets
Commons
Annotations
Logging
My code
Servlets
Commons
Annotations
Logging
My code
Servlets
Commons
Annotations
Logging
My code
Servlets
Commons
Annotations
Logging

40. 40@agoncal
My code
Top CDsssssssss
Commons
Annotations
Logging
My code
Commons
Annotations
Logging
My code
Commons
Annotations
Logging
My code
Commons
Annotations
Logging
My code
Commons
Annotations
Logging
My code
Commons
Annotations
Logging
Servlets
Local Maven Repo
If only we had Jigsaw !

41. Demo
WildFly Swarm
with M2_REPO
https://github.com/agoncal/agoncal-sample-javaee/06-EnoughAppServer

42. Some metrics

43. 43@agoncal
Packaging Size

44. 44@agoncal
Startup time

45. And how do I manage it now ?

46. 46@agoncal
Configure your app
public class MyMain {
public static void main(String...args) {
new Container()
.fraction(new DatasourcesFraction()
.jdbcDriver("h2", (d) -> {
d.driverClassName("org.h2.Driver");
d.driverModuleName("com.h2database.h2");
})
.dataSource("ExampleDS", (ds) -> {
ds.driverName("h2");
ds.connectionUrl("jdbc:h2:mem:test");
ds.userName("foo");
ds.password("bar");
}))
.start()
.deploy();

47. Demo
WildFly Swarm
with management
https://github.com/agoncal/agoncal-sample-javaee/06-EnoughAppServer

48. And what about Docker ?

49. 49@agoncal
Dockerfile
FROM java:openjdk-8-jdk
EXPOSE 8081
ADD target/topcds-swarm.jar /opt/topcds-swarm.jar
ENTRYPOINT ["java", "-jar", "/opt/topcds-swarm.jar"]

50. Demo
Docker
https://github.com/agoncal/agoncal-sample-javaee/06-EnoughAppServer

51. Demo
Raspberry PI
https://github.com/agoncal/agoncal-sample-javaee/06-EnoughAppServer

52. Final word

53. 53@agoncal
Wildfly Swarm
● Based on good old JBoss AS
● Bundles several fractions
● Java EE
●
Netflix OSS (Ribbon, Hystrix, RxJava)
● Spring
●
Logstash
● Swagger
●
...

54. 54@agoncal
Java EE App Servers
● Java EE app server have changed
● Are not monolithic, slow, consume resources
● Package the way you want (skinny/fat war, uber
jar)
● Re-use your Java EE expertise
● Look Ma, « Microservices inside »
● « I’m centralised and I’m proud! »

55. That's it !

56. 56@agoncal
http://amazon.com/author/agoncal

57. 57@agoncal
https://www.pluralsight.com/authors/antonio-goncalves

58. Thanks
www.antoniogoncalves.org
antonio.goncalves@gmail.com
@agoncal
@pluralsight
@devoxxfr
@lescastcodeurs

59. Q & A

60. 60antonio goncalves
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