1.
Java EE8 on a Diet with
Payara Micro 5
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
#PM5

4.
Agenda
- What’s new with Java EE 8?
- The Almighty: Payara Micro 5
- Demo w/ Conference App
- Q&A
@mertcal

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 Speaker {
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 Speaker {
@JsonbProperty("speakerName")
private String name;
@JsonbTransient
private String pin;
private String email;
}
{
"email": "gaurav.gupta@payara.fish",
"speakerName": "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 = "Speaker.findAll",
query = "SELECT s FROM Speaker s"),
@NamedQuery(name = "Speaker.findByName",
query = "SELECT s FROM Speaker s WHERE s.name = :name")
})
class Speaker {
@Convert(converter=LocalDateConverter.class)
private LocalDate dateOfBirth;
}
@jGauravGupta
AttributeConverter
implementation

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

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

26.
JPA 2.2
● Stream query results
Stream<Speaker> speakers =
em.createQuery(“SELECT s FROM Speaker”, Speaker.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.
● Application Server as Executable JAR
○ Small: ~70mb
● Deploy WAR files directly from command line
● Contains Java EE8 specification on board such as:
○ JAX-RS 2.1
○ Bean Validation 2.0
○ CDI 2.0
○ JPA 2.2
@mertcal
Payara Micro 5

33.
● Supports Automatic Clustering out of the box
○ Integrates with Hazelcast
○ Session replication with distributed caching
● JCA based Cloud Connectors
○ Amazon SQS
○ Kafka
○ MQTT
○ Azure Service Bus
● Eclipse MicroProfile Support w/ Config API
Payara Micro 5
@mertcal

34.
Conference App - Blending All Together w/
jeddict.github.io
@Email
@JsonbProperty
("speakerName")
@JsonbTransient
java.time.LocalDate
@NamedQuery(name = "findAll")
@NamedQuery(name = "findByName")
@NamedQuery(name = "findByEmail")
@JsonbProperty
("detail")
@NotEmpty

35.
Thank you!
Any
Questions?
%50 on ebook - JE8MEK50
%15 on printed - JE8MPK15
valid until October 11