Do you still write code on Java 8 or probably older!? If “Yes” then you definitely have to visit this talk. We will explore the most popular features and use cases from the latest Java Version and will discover how complicated migration is.

1. Latest Java
Why? How?

2. About me
2
andriyrav@gmail.com @AndriyRymarAndriy Rymar

3. Agenda
3
Why? How?

4. What means «Latest Java» ?
4

5. Many many years ago…
5

6. Green Team
6
1991
Patrick Naughton Mike Sheridan James Gosling

7. JDK 1.0
7
January 23, 1996

8. Evolution
8
• JDK 1.0 (23rd Jan 1996)
• JDK 1.1 (19th Feb 1997)
• J2SE 1.2 (8th Dec 1998)
• J2SE 1.3 (8th May 2000)
• J2SE 1.4 (6th Feb 2002)
• J2SE 5.0 (30th Sep 2004)
• Java SE 6 (11th Dec 2006)
• Java SE 7 (28th July 2011)
• Java SE 8 (18th March 2014)
• Java SE 9 (21st Sep 2017)

9. 9

10. 6 months release
10

11. Evolution
11
• JDK 1.0 (23rd Jan 1996)
• JDK 1.1 (19th Feb 1997)
• J2SE 1.2 (8th Dec 1998)
• J2SE 1.3 (8th May 2000)
• J2SE 1.4 (6th Feb 2002)
• J2SE 5.0 (30th Sep 2004)
• Java SE 6 (11th Dec 2006)
• Java SE 7 (28th July 2011)
• Java SE 8 (18th March 2014)
• Java SE 9 (21st Sep 2017)
• Java SE 10 (20th March 2018)
• Java SE 11 (25th Sep 2019)

12. Latest Java
12
Java SE 12
19th March 2019

13. 13

14. Major changes
14

15. Licenses
15
Commerce
Since JDK 11

16. Commerce?
16
Development
Free for
Production
Paid for

17. OpenJDK
17

18. 18
No more updates

19. 6 months release
19

20. Azul OracleIBM Red Hat
Checkpoint 1
https://img.wallpapersafari.com/desktop/1600/900/31/29/WBGxlY.jpg

21. Why?
21

22. 22
JDK 11 JDK 12JDK 8

23. 23
JDK 11 JDK 12JDK 8

24. Development features
24

25. 25
Optional
Optional<Value> result = …
if(result.isPresent()) {
Value value = result.get();
//DO SOMETHING
} else {
//DO SOMETHING ELSE
}
jdk<9

26. 26
Optional
ifPresentOrElse
jdk9

27. 27
Optional
Optional<Value> result = …
result.ifPresentOrElse((value) -> {
//DO SOMETHING
},{
//DO SOMETHING ELSE
});
jdk9

28. 28
Optional
orElseThrow()
jdk10

29. 29
Local-variables
var x = new HashMap<String, String>();
jdk10

30. 30
Local-variables
(var s1, var s2) -> s1 + s2
jdk11

31. 31
Local-variables
(@NotNull var s1, @Nullable var s2) -> s1 + s2
jdk11

32. 32
Shebang
#!
jdk11
Unix-like OS

33. 33
Shebang
#!/bin/sh
jdk11

34. 34
Shebang
DEMO
jdk11

35. 35
HTTP
HttpClient httpClient = HttpClient
.newBuilder()
.version(Version.HTTP_2)
.build();
HttpRequest mainRequest = HttpRequest
.newBuilder()
.uri(URI.create("https:www.example.com"))
.POST(BodyPublishers.ofString(data))
.build();
jdk11

36. 36
HTTP
HttpClient httpClient = HttpClient
.newBuilder()
.version(Version.HTTP_2)
.build();
HttpRequest mainRequest = HttpRequest
.newBuilder()
.uri(URI.create("https:www.example.com"))
.POST(BodyPublishers.ofString(data))
.build();
jdk11

37. 37
HTTP
HttpResponse<String> response = httpClient
.send(request, BodyHandlers.ofString());
response.statusCode();
response.headers();
response.body();
jdk11

38. 38
HTTP
httpClient
.sendAsync(request, BodyHandlers.ofString())
.thenAccept(response -> {
//DO SOMETHING
});
jdk11

39. 39

40. 40
New API
java.io.ByteArrayOutputStream
java.io.FileWriter
java.io.InputStream
java.io.OutputStream
java.io.Reader
java.io.Writer
java.lang.Character
java.lang.CharSequence
java.lang.ref.Reference
java.lang.Runtime
java.lang.System
java.lang.String
java.lang.StringBuffer
java.lang.StringBuilder
java.lang.Thread
java.nio.ByteBuffer
java.nio.CharBuffer
java.nio.DoubleBuffer
java.nio.FloatBuffer
java.nio.LongBuffer
java.nio.ShortBuffer
java.nio.channels.SelectionKey
java.nio.channels.Selector
java.nio.file.Files
java.nio.file.Path
java.util.Collection
java.util.concurrent.PriorityBlockingQueue
java.util.PriorityQueue
java.util.concurrent.TimeUnit
java.util.function.Predicate
java.util.Optional
java.util.OptionalInt
java.util.OptionalDouble
java.util.OptionalLong
java.util.regex.Pattern etc.
jdk11

41. 41
New API
boolean isBlank();
Stream lines();
String repeat(int);
String
jdk11

42. JDK features
42

43. 43
Nested-base access control
public class Outer {
private int intVal;
class Inner {
public void printOuterInt(){
System.out.println(intVal + 1);
}
}
}
jdk<11

44. 44
Nested-base access control
public class Outer {
private int intVal;
public int access$000() {
return intVal;
}
}
class Inner$Outer {
Outer outer;
public void printOuterInt() {
System.out.println(outer.access$000());
}
}
jdk<11

45. 45
Nested-base access control
jdk11
getNestHost();
getNestMembers();
isNestmateOf(Class);

46. public class Outer {
private int intVal;
}
class Inner$Outer {
Outer outer;
public void printOuterInt() {
System.out.println(outer.intVal);
}
}
46
Nested-base access control
jdk11

47. 47
Epsilon - garbage collector
It does not collect any garbage
jdk11

48. 48
Epsilon - garbage collector
jdk11
short-life tasks
low-latency tasks
Benchmarks

49. 49
Epsilon - garbage collector
OutOfMemory Heap dump
Fail JVM and perform another task
jdk11

50. 50
Flight recorder
Low-overhead data collection framework
https://www.baeldung.com/java-
flight-recorder-monitoring
jdk11

51. 51
jdk11

52. 52
JDK 11
Much more
About 17 JEPs

53. 53
JDK 11 JDK 12JDK 8

54. 54
JDK 11 JDK 12JDK 8

55. Development features
55

56. 56
Switch expressions
int salary;
String level = "D1";
switch(level){
case "D0":
case "D1":
case "D2":
salary = 500;
break;
case "D3":
case "D4":
case "D5":
salary = 750;
break;
case "D6":
case "D7":
salary = 1000;
break;
default: salary = 750;
}
jdk<12

57. 57
Switch expressions
String level = "D1";
int salary = switch(level){
case "D0", "D1", "D2" -> 500;
case "D3", "D4", "D5" -> 750;
case "D6", "D7" -> 1000;
default -> 750;
}
jdk12

58. 58
Switch expressions
String level = "D1";
var salary = switch(level){
case "D0", "D1", "D2" -> 500;
case "D3", "D4", "D5" -> 750;
case "D6", "D7" -> "Тобі вже досить!";
default -> "Йди гуляй!";
}
jdk12

59. 59
Switch expressions
Preview
javac --release 12 --enable-preview -Xlint:preview <class-filename>.java
jdk12

60. 60
Microbenchmark suite
public class MyClass {
@Benchmark
@Fork(value = 1, warmups = 2)
@BenchmarkMode(Mode.Throughput)
public void method() {
// Your code
}
}
jdk12

61. 61
Microbenchmark suite
# Run complete. Total time: 00:06:47
Benchmark (iterations) Mode Cnt Score Error Units
MyClass.method 100 thrpt 20 92463.622 ± 1672.227 ops/s
MyClass.method 200 thrpt 20 39737.532 ± 5294.200 ops/s
MyClass.method 300 thrpt 20 30381.144 ± 614.500 ops/s
MyClass.method 500 thrpt 20 18315.211 ± 222.534 ops/s
MyClass.method 1000 thrpt 20 8960.008 ± 658.524 ops/s
jdk12

62. 62
Collectors.teeing()
jdk12

63. 63
Collectors.teeing()
static <T, R1, R2, R> Collector<T, ?, R> teeing(
Collector<? super T, ?, R1> downstream1,
Collector<? super T, ?, R2> downstream2,
BiFunction<? super R1, ? super R2, R> merger)
jdk12

64. 64
Collectors.teeing()
carStream.collect(
Id: 1
8000$ 8500$ 7500$ 7000$ 8500$
Id: 2 Id: 3 Id: 4 Id: 5
teeing(
filtering(Car::isSold(), summingInt(Car::getPrice)),
new AccountancyReport::new));
filtering(Car::isNotSold(), mapping(o -> o.id, Collectors.toList())),
jdk12

65. 65
Collectors.teeing()
carStream.collect(
Id: 1
8000$ 8500$ 7500$ 7000$ 8500$
Id: 2 Id: 3 Id: 4 Id: 5
{leftCarIds:[2, 4, 5], soldCarAmount = 15500}
Collectors.teeing(
Collectors.filtering(Car::isSold(), Collectors.summingInt(Car::getPrice)),
(soldCarAmount, leftCarIds) -> new AccountancyReport(soldCarAmount, leftCarIds)));
Collectors.filtering(Car::isNotSold(), Collectors.mapping(o -> o.id, Collectors.toList())),
jdk12

66. JDK features
66

67. 67
Shenandoah
Low-Pause-Time GC
Mark Evacuation Update Reference Cleanup
jdk12

68. 68
JDK 12
Much more
About 8 JEPs

69. JDK 13
69

70. 70
JDK 13
JEP 350: Dynamic CDS Archives
JEP 351: ZGC: Uncommit Unused Memory

71. Checkpoint 2
Developer Java

72. Checkpoint 2

73. How?
73

74. Easy
74
From the scratch
https://ui-ex.com/images/yoda-vector-master-2.png

75. 75

76. 76
Migration
• JEE Support
• Update Libraries
• Access to Internal API
• Removed API

77. 77
Update Libraries
Lombok

78. 78
Update Libraries Issues
• Not supported
• Not supported Lates JDK yet

79. XML WS
79
No JEE

80. 80
No JEE
<dependency>
<groupId>org.glassfish.jaxb</groupId>
<artifactId>jaxb-runtime</artifactId>
<version>2.4.0-b180830.0438</version>
</dependency>
<dependency>
<groupId>com.sun.xml.ws</groupId>
<artifactId>jaxws-rt</artifactId>
<version>2.3.1</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>com.sun.xml.ws</groupId>
<artifactId>rt</artifactId>
<version>2.3.1</version>
</dependency>

81. 81
XML WS

82. 82
Access to Internal API
package <CLASS> is declared in module <PACKAGE>,
which does not export it
--add-exports module/package=ALL-UNNAMED

83. java.lang.Runtime.getLocalizedInputStream()
83
Removed API
javax.security.auth.Policy
java.lang.Thread.stop(java.lang.Throwable)
sun.misc.Base64
java.lang.SecurityManager
java.lang.Runtime.getLocalizedOutputStream()

84. 84
Checkpoint 3

85. http://thenerdygiftcompany.co.uk/shop/clothing/cool-yoda/
Summary
85

86. Resources
86
https://www.javatpoint.com/history-of-java
Java 11:
• https://blog.jetbrains.com/idea/2018/09/using-java-11-in-production-important-things-to-know/
• https://medium.com/@javachampions/java-is-still-free-c02aef8c9e04
• https://dzone.com/articles/jdk-11-general-availability?fromrel=true
• https://gunnarmorling.github.io/jdk-api-diff/jdk10-jdk11-api-diff.html
Features:
• https://dzone.com/articles/90-new-features-and-apis-in-jdk-11
• https://dzone.com/articles/90-new-features-and-apis-in-jdk-11-part-2?fromrel=true
• https://www.journaldev.com/24601/java-11-features
Migration :
• https://blog.codefx.org/java/java-11-migration-guide/
• https://medium.com/criciumadev/its-time-migrating-to-java-11-5eb3868354f9
Java 12:
• https://medium.com/@rajeshontech/new-features-in-java-12-b40c00f3bda5?sk=b4e07c36761d33e9bbbbb507958c8092
• https://dzone.com/articles/jdk-12-news-13-september-2018?fromrel=true
• https://dzone.com/articles/a-new-jdk12-stream-api-collection-collectorsteeing

87. Thanks | Q. & A.
87
andriyrav@gmail.com @AndriyRymar