Rapid Development Tools for Java EE 8 was a talk given at JavaOne 2017 about new features in Java EE 8 and tools to help with rapid development of Java EE 8 applications. It covered the Reactive Client API and JSON-B support in JAX-RS 2.1, asynchronous events and other new features in CDI 2.0 and Bean Validation 2.0, and how tools like Jeddict can generate Java EE 8 applications from models.

1. Rapid Development Tools for
Java EE 8
Mert Çalışkan, Gaurav Gupta
JavaOne 2017

2. Mert Çalışkan
Payara Developer
Java EE / Spring Consultant
Author of PrimeFaces Cookbook
Author of Beginning Spring book
Part-time Lecturer
@mertcal
Gaurav Gupta
Payara Developer
NetBeans Dream Team
Jeddict Creator ( jeddict.github.io )
@jGauravGupta , @ImJeddict

3. React to the talk
Join at
slido.com
#EE8

4. Agenda
- What’s new with Java EE 8? : Quick overview
- Java EE 8 application generation w/ Jeddict
- Java EE Tools : In depth
- Q&A
@jGauravGupta

5. What’s new with Java EE 8?
Java EE 8 is released on Sep 06, 2017.
● JAX-RS 2.1 (Jersey 2.26)
● CDI 2.0 (Weld 3.0.0.Final)
● Bean Validation 2.0 (Hibernate Validator 6.0.2.Final)
● JSON-B (Yasson 1.0)
● JPA 2.2 (EclipseLink 2.7.0)
● Java Security API 1.0 (Soteria 1.0)
Checkout https://github.com/javaee-samples/javaee8-samples for details on the
examples
@mertcal

6. ● Reactive Client API
● JSON-B support
● Server Sent Events (SSE)
JAX-RS 2.1 (JSR 370)
@mertcal

7. ● With JAX-RS 2.0, we had asynchronous invoker approach as:
Client client = ClientBuilder.newClient();
WebTarget target = client.target("http://localhost:8080/service-url");
Invocation.Builder builder = target.request();
Future<MyClass> futureResult = builder.async().get(MyClass.class);
System.out.println(futureResult.get());
client.close();
JAX-RS 2.1
@mertcal

8. ● Previous scenario can also be implemented with InvocationCallback<T>
but…
Client client = ClientBuilder. newClient();
WebTarget target = client.target( "http://localhost:8080/service-url");
Invocation.Builder builder = target.request();
builder.async().get( new InvocationCallback<MyClass>() {
@Override
public void completed(MyClass t) {}
@Override
public void failed(Throwable throwable) {}
});
JAX-RS 2.1
@mertcal

9. ● Reactive Client API to the rescue.
Client client = ClientBuilder.newClient();
WebTarget target = client.target("http://localhost:8080/service-url");
Invocation.Builder builder = target.request();
CompletionStage<Response> response = builder.rx().get();
response.thenAcceptAsync(res -> {
MyClass t = res.readEntity(MyClass.class);
System.out.println(t);
});
JerseyCompletionStageRxInvoker
CompletionStage<Response>
JAX-RS 2.1
@mertcal

10. ● 3rd Party Reactive Framework Support
○ RxJava
Client client = ClientBuilder.newClient().register(RxFlowableInvokerProvider.class);
WebTarget target = client.target("http://localhost:8080/service-url");
Invocation.Builder builder = target.request();
Flowable<Response> flowable = builder.rx(RxFlowableInvoker.class).get();
flowable.subscribe(res -> {
MyClass t = res.readEntity(MyClass.class);
System.out.println(t);
});
reactive invoker specialized
for io.reactivex.Flowable
JAX-RS 2.1
@mertcal

11. Client client = ClientBuilder.newClient().target("http://localhost:8080/service-url")
.request()
.get();
Client client = ClientBuilder.newClient().target("http://localhost:8080/service-url")
.request()
.async()
.get();
Client client = ClientBuilder.newClient().target("http://localhost:8080/service-url")
.request()
.rx()
.get();
JAX-RS 2.1
@mertcal

12. ● Server Sent Events (SSE) is a mechanism that allows server to
asynchronously push data from the server to client once the client-server
connection is established by the client.
● It’s mostly like Long-Pooling but it’s not :) and it’s not WebSockets either.
● Implementations already provided it with JAX-RS 2.0 but there was no standard
API. With JAX-RS 2.1, API is created under javax.ws.rs.sse
JAX-RS 2.1
@mertcal

13. @Path("/temperature")
public class TemperatureResource {
private final OutboundSseEvent.Builder sseEventBuilder;
public TemperatureResource( @Context Sse sse) {
this.sseEventBuilder = sse.newEventBuilder();
}
@GET
@Path("/{city}")
@Produces(MediaType.SERVER_SENT_EVENTS)
public void getCurrentTemperatureStream( @Context SseEventSink eventSink) {
while (true) {
eventSink.send( sseEventBuilder.data(temperature)
.mediaType(MediaType. APPLICATION_JSON_TYPE).build());
Thread. sleep(1000);
}
}
}
"text/event-stream"
1
2
3
4
JAX-RS 2.1
@mertcal

14. CDI 2.0 (JSR 365)
- SE Support - It’s possible to use CDI outside of Java EE
- Ordering of CDI events - @Priority helps ordering observers
void receive(@Observes @Priority(APPLICATION + 200) String greet) {
this.greet += greet + "2";
}
void receive2(@Observes @Priority(APPLICATION) String greet) {
this.greet = greet + "1";
}
For send(“Welcome”) output will be:
Welcome1Welcome2
@Inject
private Event<String> event;
public void send(String message) {
event.fire(message);
}
@mertcal

15. CompletableStage<MyEvent> eventSent = event.fireAsync( new MyEvent(),
NotificationOptions.ofExecutor(executor));
- Exception in async observer doesn’t break the observer invocation chain.
callMe(@Observes payload) callMe(@ObservesAsync payload)
event.fire(payload) Sync call Not Notified
event.fireAsync(payload) Not Notified Async call
- Long awaited Asynchronous Events Support
- Fire Sync → Observer Sync / Fire Async → Observer Async
CDI 2.0
@mertcal

16. ● Java 8 Date and Time API Support
@Past(message = "must be a past date")
private java.time.Year yearOfBirth;
● Type Annotations
private List<@NotNull @Email String> emails;
private String @NotNull @Email[] emails;
private Map<@Valid Employee, @Valid Address> addressMap = new HashMap<>();
@mertcal
Bean Validation 2 (JSR 380)

17. ● java.util.Optional Support
private Optional<@Past LocalDate> marriageAnniversary;
private Optional<@Size(max = 20) String> name;
● Repeating Annotations
@Max(value = 2000, groups = Default.class)
@Max(value = 5000, groups = GoldCustomer.class)
private long withdrawalAmount;
@mertcal
Bean Validation 2

18. Bean Validation 2
● Introduces new constraints
○ @Email
○ @NotBlank
○ @NotEmpty
○ @PastOrPresent
○ @FutureOrPresent
○ @Negative
○ @NegativeOrZero
○ @Positive
○ @PositiveOrZero
@mertcal

19. JSON-B (JSR 367)
● Standard solution like JAXB
● Default mapping between classes and JSON
● Customizable
a. Compile time
■ Property naming @JsonbProperty
■ Property ignoring @JsonbTransient
■ Null handling @JsonbNillable
■ Property ordering @JsonbPropertyOrder
■ Date and Number Format @JsonbDateFormat/@JsonbNumberFormat
■ Adapter @JsonbTypeAdapter
b. Runtime configration
■ Configuration builder JsonbConfig
@jGauravGupta

20. JSON-B - Customizations
class Employee {
private String name;
private String pin;
private String email;
}
{
"name": "Gaurav",
"pin": "J1-Secret",
"email": "gaurav.gupta@payara.fish",
}
@jGauravGupta

21. JSON-B - Customizations
@JsonbPropertyOrder({"email", "name"})
class Employee {
@JsonbProperty("empName")
private String name;
@JsonbTransient
private String pin;
private String email;
}
{
"email": "gaurav.gupta@payara.fish",
"empName": "Gaurav"
}
@jGauravGupta

22. JPA 2.2 (JSR 338)
● @Repeatable annotations
● Support Java 8 Date and Time API
● Ability to return stream of query result
● CDI Injection in AttributeConverters
@jGauravGupta

23. JPA 2.1
Container annotation required
@Entity
@NamedQueries({
@NamedQuery(name = "Employee.findAll",
query = "SELECT e FROM Employee e"),
@NamedQuery(name = "Employee.findByName",
query = "SELECT e FROM Employee e WHERE e.name = :name")
})
class Employee {
@Convert(converter=LocalDateConverter.class)
private LocalDate dateOfBirth;
} AttributeConverter
implementation @jGauravGupta

24. JPA 2.2
Container annotation not required
@Entity
@NamedQueries({
@NamedQuery(name = "Employee.findAll",
query = "SELECT e FROM Employee e"),
@NamedQuery(name = "Employee.findByName",
query = "SELECT e FROM Employee e WHERE e.name = :name")
})
class Employee {
@Convert(converter=LocalDateConverter.class)
private LocalDate dateOfBirth;
}
AttributeConverter not required @jGauravGupta

25. JPA 2.2
@Entity
@NamedQuery(name = "Employee.findAll",
query = "SELECT e FROM Employee e")
@NamedQuery(name = "Employee.findByName",
query = "SELECT e FROM Employee e WHERE e.name = :name")
class Employee {
private LocalDate dateOfBirth;
}
@jGauravGupta

26. JPA 2.2
● Stream query results
Stream<Employee> employees =
em.createQuery(“SELECT e FROM Employee”, Employee.class)
.getResultStream();
@jGauravGupta

27. Security API 1.0 (JSR 375)
● Simplify the existing solution
● Enhance the portability
● New APIs
○ HTTPAuthenticationMechanism
○ IdentityStore
○ SecurityContext
@jGauravGupta

28. Security API 1.0 (JSR 375)
● Authentication Mechanism
○ validateRequest(request, response, httpMessageContext)
○ secureResponse(request, response, httpMessageContext)
○ cleanSubject(request, response, httpMessageContext)
● Identity Store
○ validate(credential)
○ getCallerGroups(credentialValidationResult)
● Security Context
○ getCallerPrincipal()
○ isCallerInRole(role)
○ … … …
@jGauravGupta

29. @ApplicationScoped
public class MyAuthMechanism implements HttpAuthenticationMechanism {
@Override
public AuthenticationStatus validateRequest(HttpServletRequest request,
HttpServletResponse response, HttpMessageContext context) {
}
}
Security API 1.0
@jGauravGupta

30. @ApplicationScoped
public class MyAuthMechanism implements HttpAuthenticationMechanism {
@Inject
private IdentityStoreHandler identityStoreHandler;
@Override
public AuthenticationStatus validateRequest(HttpServletRequest request,
HttpServletResponse response, HttpMessageContext context) {
………
identityStoreHandler.validate(credential);
………
}
}
Security API 1.0
@jGauravGupta

31. @ApplicationScoped
public class MyAuthMechanism implements HttpAuthenticationMechanism {
@Inject
private IdentityStoreHandler identityStoreHandler;
@Override
public AuthenticationStatus validateRequest (HttpServletRequest request,
HttpServletResponse response, HttpMessageContext context) {
………
identityStoreHandler.validate(credential);
………
}
}
Security API 1.0
@jGauravGupta

32. Java EE 8 App generation w/
jeddict.github.io
@Email
@JsonbProperty
("fName")
@JsonbTransient
java.time.LocalDate
@NamedQuery(name = "findAll")
@NamedQuery(name = "findByFirstName")
@NamedQuery(name = "findByEmail")
@JsonbProperty
("number")
@NotEmpty
@JsonbProperty
("lName")
OpenERP Domain model

33. @jGauravGupta
Building Angular app

34. Java EE Tools : In depth
● Jeddict modeler
● Dynamic Code Evaluation
● Payara Fish in NetBeans IDE
● Payara CDI Dev Mode
● Payara AsAdmin Recorder
● Maven Plugin
@jGauravGupta

35. ● Supports any relational database (JDBC compliant)
● Relationship mapping
○ JoinColumn to JoinTable converter and vice versa
○ java.util.Collection, java.util.Map
● Embeddable
● Inheritance
● Query Builder / Executor / Generator (JPQL, SQL, Stored Procedure, Entity Graph)
● JAXB / JSON-B
● Bean Validation
● more… Fluent API, java.util.Optional, Reverse Engineering etc.
Jeddict modeler
@jGauravGupta

36. JPA 2.2 modeler - Relationship
Self reference
Many-to-One
One-to-One
Many-to-Many
@jGauravGupta

37. JPA 2.2 modeler - Embedded
Nested Embeddable
Embedded Collection Multiple Embedded fields @jGauravGupta

38. JPA 2.2 modeler - Entity Inheritance
Nested Inheritance
@jGauravGupta

39. ● Supports any relational database (JDBC compliant)
● Relationship mapping
○ JoinColumn to JoinTable converter and vice versa
○ java.util.Collection, java.util.Map
● Embeddable
● Inheritance
● Query Builder / Executor / Generator (JPQL, SQL, Stored Procedure, Entity Graph)
● Bean Validation
● JAXB / JSON-B
● more… Fluent API, java.util.Optional, Reverse Engineering etc.
Jeddict modeler
@jGauravGupta

40. ● JRE Patch
● Update the code instantly
● DCEVM Dynamic Code Evolution VM http://dcevm.github.io/
STEP-1 : Java installation with the DCEVM engine
STEP-2 : Connect with the Payara Server
STEP-3 : Turn off redeployment of the application on save
STEP-4 : Turn on compile and apply code changes on save
Dynamic Code Evolution
@jGauravGupta

41. ● Bean Archives
● Beans and their properties
○ such as qualifiers, stereotypes and name
● Invocation Trees
● Observers and producers declared by beans
● Interceptors and decorators
● Extensions
● Fired events
Payara CDI Dev Mode : to inspect
@jGauravGupta

42. ● Graph of bean dependency
Payara CDI Dev Mode : to inspect
@jGauravGupta

43. ● Graph of bean archives
Payara CDI Dev Mode : to inspect
@jGauravGupta

44. ● Trace the admin console actions
● Create automation scripts easily
● Helps to investigate
Payara AsAdmin Recorder
@jGauravGupta

45. ● payara-micro-maven-plugin incorporates payara-micro with produced
artifact.
● Offers 3 mojos
○ bundle
○ start
○ stop
● Plugin is available on Maven Central
<groupId>fish.payara.maven.plugins</groupId>
<artifactId>payara-micro-maven-plugin</artifactId>
<version>1.0.0</version>
Maven Plugin
@mertcal

46. <configuration>
<customJars>
<artifactItem>
<groupId>org.primefaces</groupId>
<artifactId>primefaces</artifactId>
<version>6.0</version>
</artifactItem>
</customJars>
</configuration>
<configuration>
<startClass>
my.custom.start.class.Main
</startClass>
<deployArtifacts>
<artifactItem>
<groupId>org.mycompany</groupId>
<artifactId>my-project</artifactId>
<version>1.0</version>
<type>ear</type>
</artifactItem>
</deployArtifacts>
<configuration>
Maven Plugin - bundle mojo config
into MICRO-INF/deploy folder
into MICRO-INF/lib folder
@mertcal

47. <configuration>
<useUberJar>true</useUberJar>
<daemon>true</daemon>
<javaPath>/path/to/Java/Home</javaPath>
<payaraMicroAbsolutePath>/path/to/payara-micro.jar</payaraMicroAbsolutePath>
<artifactItem>
<groupId>fish.payara.extras</groupId>
<artifactId>payara-micro</artifactId>
<version>4.1.1.171</version>
</artifactItem>
<commandLineOptions>
<option>
<key>--autoBindHttp</key>
<value>true</value>
</option>
</commandLineOptions>
</configuration>
Maven Plugin - start mojo config
@mertcal

48. Thank you!
Any
Questions?
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