The last few years have been pretty exciting for Java with new versions of EE and SE platforms. Java EE, introduced a new API to build WebSockets; a new API to parse, process and generate JSON; a new Client API in JAX-RS to invoke REST services, and finally the Batch Processing API to build batch applications. Java SE brought us the long awaited Lambda expressions; the powerful Streams API to perform operations like filtering, mapping or sorting in a very easy and fluent way, and a brand new Date Time API, to deal with the complexities of Timezones and Periods. This session will combine all of these elements together and show you how to easily develop an application using Java SE 8 with Java EE 7, with live coding and samples. This session will explore the usage of the new Java 8 API's, combined with some of the new and existing features of Java EE. It will mostly be a live coding session where I plan to combine Java 8 Lambdas, Streams and DateTime API's with JPA, CDI, REST, Websockets and Batch. The interesting thing about this session is about how to adjust your coding style and learn where you can use all these awesome Java 8 feature when developing a standard Enterprise application.

1. JavaOne
@radcortez#javaee7java8
Java EE 7 meets Java 8
Roberto Cortez
Tomitribe

2. JavaOne
@radcortez#javaee7java8
Who am I?
Passionate Developer, Blogger, Youtuber, Speaker, Triber, JUG
Leader, Java Champion
twi*er:
@radcortez
blog:
h*p://www.radcortez.com
youtube:
h*p://youtube.com/radcortez
mail:
radcortez@yahoo.com

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@radcortez#javaee7java8
Ques:ons?
As soon as you have them!

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Agenda
• SE and EE overview
• Code Demos
• JPA, Date Time API, OpFonal and Streams
• JAX-­‐RS, OpFonal and Completable Future
• Websockets, Streams, CollecFons enhancements
• Timers, Concurrency and Method References
• Batch, OpFonal and Streams
• Future Ideas
• Bean ValidaFon, JPA and Method References
• Stream Batch

5. JavaOne
@radcortez#javaee7java8
SE and EE versions alignment
J2SE
1.2
1998
J2EE
1.2
1999
J2SE
1.3
2000
J2EE
1.3
2001
J2SE
1.4
2002
J2EE
1.4
2003
Java
SE 5
2004
Java
EE 5
2006
Java
SE 6
2006
Java
EE 6
2009
Java
SE 7
2011
Java
EE 7
2013
Java
SE 8
2014
Java
EE 8
2017
Java
SE 9
2017

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SE and EE versions alignment
• EE targets the previous SE version
• EE will only align with SE 8 in EE 8
• EE 7 is not targeted to SE 8
Even so, we can improve current EE 7 with SE 8

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EE Applica:on Servers
• All major EE servers support SE 8
• Glassfish
• Wildfly
• TomEE
• Weblogic
• Websphere Liberty
• Some already dropped SE 7 support completely
• EE developers are free to use SE 8

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SE 8 give us
• Major
• Lambdas :) (and Method References)
• Streams
• Date & Time API
• Other
• CollecFons enhancements
• OpFonal, StringJoiner, CompletableFuture, Comparator, Repeatable
AnnotaFons

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Demos
https://github.com/radcortez/javaee7-java8

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What about Parallel Streams?
• They use the common ForkJoinPool
• Threads outside of the EE environment
• ForkJoinPool uses all available CPU cores
• Use at your own risk!
• This can help: -­‐
Djava.uFl.concurrent.ForkJoinPool.common.parallelism=1
• No parallelism
• In the future EE servers might handle parallel streams properly

11. JavaOne
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Thank you for AKending!
QA
twi*er:
@radcortez
blog:
h*p://www.radcortez.com
youtube:
h*p://youtube.com/radcortez
mail:
radcortez@yahoo.com