Download JNDI and CDI

Enterprise
Java
JNDI
Enterprise Naming Conext
(ENC)
and
Injection
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JNDI ENC
1
Goals
Enterprise
Java
• Configure applications
– Using the JNDI Enterprise Naming Context (ENC)
– Using Context and Dependency Injection (CDI)
• Access remote EJBs
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JNDI ENC
2
Objectives
•
•
•
•
•
•
•
Enterprise
Java
JNDI ENC Overview
JNDI ENC Lookup
XML Population
Annotation Population
Dependency Injection
Context and Dependency Injection (CDI) Population
Remote JNDI Client
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JNDI ENC
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JNDI ENC Overview
Enterprise
Java
• Component's individual address space
• Holds references to values and objects in the
environment
• Theoretical equivalent to Unix soft links
– ln -s <some physical file path> $HOME/<my logical path>
• Object's registered
– EJB interfaces (local and remote)
– JMS connection factories
– JMS destinations
– data sources
– any JCA resource
– primitive values
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JNDI ENC
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JNDI ENC and Injection
Enterprise
Java
• Objects are placed in the component's JNDI ENC by the
container
• Components may look these values up
– using raw JNDI calls
– using SessionContext convenience method
– allows any nested component to also get the environment
• Components may have values injected into
properties/fields.
– fewer lines of code dedicated to lookups
– inversion of control
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JNDI ENC
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Reading JNDI ENC
Enterprise
Java
• JNDI
InitialContext jndi = new InitialContext();
object = jndi.lookup(“java:comp/env/encname);
• SessionContext
SessionContext ctx;
...
object = ctx.lookup(“encname”);
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JNDI ENC
6
XML Population: Example POJO Style
Enterprise
Java
//@Local declared by ejb-jar.xml entry
public interface HospitalLocal extends Scheduler {}
//@Remote declared by ejb-jar.xml entry
public interface HospitalRemote extends Scheduler {}
//@Stateless(name=”Hospital”) declared by ejb-jar.xml entry
public class HospitalEJB
extends SchedulerBase implements HospitalLocal, HospitalRemote {
public String getName() { return "HospitalEJB"; }
}
@Resource
public void setSessionContext(SessionContext ctx) { this.ctx = ctx;
}
//@Local declared by ejb-jar.xml entry
public interface AidSchedulerLocal extends Scheduler {}
//@Remote declared by ejb-jar.xml entry
public interface AidSchedulerRemote extends Scheduler {}
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Enterprise
Java
XML Population: Example POJO Style
//@Stateless(name=”AidScheduler”) declared by ejb-jar.xml entry
public class AidSchedulerEJB extends SchedulerBase
implements AidSchedulerLocal, AidSchedulerRemote {
private EntityManager em;
private DataSource ds;
private String message;
private HospitalLocal hospital;
@Resource //in super - protected SessionContext ctx;
public void setSessionContext(SessionContext ctx) {
this.ctx = ctx; }
public void init() {
log.info("************* AidScheduler Created ************");
log.debug("ctx=" + ctx);
log.debug("ejb/hospital=" + ctx.lookup("ejb/hospital"));
log.debug("message=" + message);
log.debug("em=" + em);
log.debug("ds=" + ds);
log.debug("hospital=" + hospital);
}
public String getName() { return "AidScheduler"; }
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XML Population: Example Output
Enterprise
Java
******************* AidScheduler Created ******************
ctx=org.jboss.as.ejb3.context.SessionContextImpl@178cae4
ejb/hospital=Proxy for view class: ejava.examples.jndidemo.ejb.HospitalLocal of EJB:
Hospital
message=Hello Helping World
em=org.jboss.as.jpa.container.TransactionScopedEntityManager@77051f
ds=org.jboss.jca.adapters.jdbc.WrapperDataSource@1839aa9
hospital=Proxy for view class: ejava.examples.jndidemo.ejb.HospitalLocal of EJB:
Hospital
listing env
jndi: java:comp/env/ejb/hospital=Proxy for view class:
ejava.examples.jndidemo.ejb.HospitalLocal of EJB: Hospital
enc: ejb/hospital=Proxy for view class: ejava.examples.jndidemo.ejb.HospitalLocal of
EJB: Hospital
jndi:
java:comp/env/persistence/jndidemo=org.jboss.as.jpa.container.TransactionScopedE
ntityManager@10750d5
enc:
persistence/jndidemo=org.jboss.as.jpa.container.TransactionScopedEntityManager@b
32027
java:comp/env=listing java:comp/env
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Enterprise
Java
XML Population: META-INF/ejb-jar.xml
<?xml version="1.0"?>
<ejb-jar xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/ejb-jar_3_1.xsd"
version="3.1">
<enterprise-beans>
...
<session>
<ejb-name>Hospital</ejb-name>
<business-local>ejava.examples.jndidemo.ejb.HospitalLocal</business-local>
<business-remote>ejava.examples.jndidemo.ejb.HospitalRemote</business-remote>
<ejb-class>ejava.examples.jndidemo.ejb.HospitalEJB</ejb-class>
</session>
</enterprise-beans>
</ejb-jar>
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Enterprise
Java
XML Population: META-INF/ejb-jar.xml
<enterprise-beans>
<session>
<ejb-name>AidScheduler</ejb-name>
<business-local>ejava.examples.jndidemo.ejb.AidSchedulerLocal</business-local>
<business-remote>ejava.examples.jndidemo.ejb.AidSchedulerRemote</business-remote>
<ejb-class>ejava.examples.jndidemo.ejb.AidSchedulerEJB</ejb-class>
<session-type>Stateless</session-type>
<!-- REMAINDER OF EXAMPLE GOES HERE -->
<post-construct>
<lifecycle-callback-method>
init
</lifecycle-callback-method>
</post-construct>
</session>
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XML Population: env-entry
Enterprise
Java
<env-entry>
<env-entry-name>vals/message</env-entry-name>
<env-entry-type>java.lang.String</env-entry-type>
<env-entry-value>Hello Helping World</env-entry-value>
<injection-target>
<injection-target-class>
ejava.examples.jndischeduler.ejb.AidSchedulerEJB
</injection-target-class>
<injection-target-name>message</injection-target-name>
</injection-target>
</env-entry>
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XML Population: ejb-local-ref
Enterprise
Java
<ejb-local-ref>
<ejb-ref-name>ejb/hospital</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<local>ejava.examples.jndischeduler.ejb.HospitalLocal</local>
<ejb-link>Hospital</ejb-link>
<injection-target>
<injection-target-class>
ejava.examples.jndischeduler.ejb.AidSchedulerEJB
</injection-target-class>
<injection-target-name>hospital</injection-target-name>
</injection-target>
</ejb-local-ref>
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XML Population: EntityManager
Enterprise
Java
<persistence-context-ref>
<persistence-context-ref-name>
persistence/jndidemo
</persistence-context-ref-name>
<persistence-unit-name>jndischeduler</persistence-unit-name>
<persistence-context-type>Transaction</persistence-context-type>
<injection-target>
<injection-target-class>
ejava.examples.jndischeduler.ejb.AidSchedulerEJB
</injection-target-class>
<injection-target-name>em</injection-target-name>
</injection-target>
</persistence-context-ref>
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XML Population: DataSource
Enterprise
Java
<resource-ref>
<res-ref-name>jdbc/myds</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
<injection-target>
<injection-target-class>
ejava.examples.jndidemo.ejb.AidSchedulerEJB
</injection-target-class>
<injection-target-name>ds</injection-target-name>
</injection-target>
</resource-ref>
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XML JNDI mapping META-INF/jbossejb3.xml
Enterprise
Java
<?xml version="1.0"?>
<jboss:ejb-jar
xmlns:jboss="urn:jboss:domain:ejb3:1.1"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:s="urn:security"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/ejb-jar_3_1.xsd"
version="3.1"
impl-version="2.0">
<enterprise-beans>
<session>
<ejb-name>AidScheduler</ejb-name>
<resource-ref>
<res-ref-name>jdbc/myds</res-ref-name>
<jndi-name>java:jboss/datasources/ExampleDS</jndi-name>
</resource-ref>
</session>
</enterprise-beans>
</jboss:ejb-jar>
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Enterprise
Java
Annotation Population: Example Entities
@Local
public interface CookLocal extends Scheduler {}
@Stateless
public class CookEJB extends SchedulerBase implements CookLocal {
public String getName() { return "CookEJB"; }
@Resource
protected void setSessionContext(SessionContext ctx) {
super.ctx = ctx;
}
}
@Remote
public interface BakeSchedulerRemote extends Scheduler {}
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Enterprise
Java
Annotation Population: Example Java Class
@Stateful(name="BakeScheduler")
@PersistenceContext(unitName="jndidemo",
name="persistence/jndidemo",
type=PersistenceContextType.EXTENDED)
public class BakeSchedulerEJB
extends SchedulerBase implements BakeSchedulerRemote {
@PersistenceContext(unitName="jndidemo",
type=PersistenceContextType.EXTENDED)
private EntityManager em;
@Resource(name="persistence/jndidemo")
private EntityManager em2;
@Resource(mappedName="java:jboss/datasources/ExampleDS")
private DataSource ds;
@Resource
protected void setSessionContext(SessionContext ctx) {
super.ctx = ctx;
}
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Enterprise
Java
Annotation Population: Example Java Class
protected CookLocal cook;
@EJB(name=“ejb/cook”)
protect CookLocal cook2;
@Resource(name="vals/message")
String message;
@PostConstruct
public void init() {
log.info("********* BakeScheduler Created ********");
log.debug("ctx=" + ctx);
log.debug("em=" + em);
log.debug("ds=" + ds);
log.debug("persistence/jndidemo=" +
ctx.lookup("persistence/jndidemo"));
log.debug("message=" + message);
log.debug("cook=" + cook);
log.debug("cook=" + cook2);
log.debug("ejb/cook=" + ctx.lookup("ejb/cook"));
}
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Enterprise
Java
Annotation Population: Example Output
******************* BakeScheduler Created ******************
ctx=org.jboss.as.ejb3.context.SessionContextImpl@18d9f9b
em=ExtendedEntityManager [
jndiDemoEAR-3.0.2012.2-SNAPSHOT.ear/jndiDemoEJB.jar#jndidemo]
em2=ExtendedEntityManager [
jndiDemoEAR-3.0.2012.2-SNAPSHOT.ear/jndiDemoEJB.jar#jndidemo]
ds=org.jboss.jca.adapters.jdbc.WrapperDataSource@1839aa9
message=null
cook=null
cook2=Proxy for view class: ejava.examples.jndidemo.ejb.CookLocal of EJB: CookEJB
ejb/cook=Proxy for view class: ejava.examples.jndidemo.ejb.CookLocal of EJB:
CookEJB
listing java:comp/env
jndi: java:comp/env/ejb/cook=Proxy for view class:
ejava.examples.jndidemo.ejb.CookLocal of EJB: CookEJB
enc: ejb/cook=Proxy for view class: ejava.examples.jndidemo.ejb.CookLocal of EJB:
CookEJB
jndi: java:comp/env/persistence/jndidemo=ExtendedEntityManager [jndiDemoEAR3.0.2012.2-SNAPSHOT.ear/jndiDemoEJB.jar#jndidemo]
enc: persistence/jndidemo=ExtendedEntityManager [jndiDemoEAR-3.0.2012.2SNAPSHOT.ear/jndiDemoEJB.jar#jndidemo]
java:comp/env=listing java:comp/env
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Dependency Injection
Enterprise
Java
• fields
– simple, less verbose
• property setter
– easier to plug into unit tests
– no need for getter
– inheritance supported
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Context and Dependency Injection (CDI):
JSR-299
Enterprise
Java
• JSR-299
• Started as “Web Beans”
• Derived from Seam
• Original Draft conflicted with Google+Spring
submission
– JSR-330 (Java Injection)
• Approved version refactored to account for JSR-330
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Sample CDI Related Types
•
•
•
Enterprise
Java
java.lang.annotation
–
@Retention – how long annotation is retained (default=CLASS)
–
RetentionPolicy
•
CLASS – annotation recorded in class file but not available at runtime
•
RUNTIME – annotation recorded in class and available at runtime
•
SOURCE – annotation discarded by compiler
–
@Target – kind of Java construct annotation applies
–
ElementType
•
TYPE
•
FIELD
•
METHOD
•
PARAMETER
•
(more)
javax.inject (JSR-330)
–
@Inject – an injection target
–
@Named – string qualifier
–
@Qualifier – identifes qualifier annotations
javax.enterprise.inject (JSR-299)
–
–
–
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@Produces – an injection source
@Any – no qualifiers
Instance<Bean> -- runtime source for Bean
JNDI ENC
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CDI: Producer Field, Named Qualifiers, and
Injection
Enterprise
Java
public class SchedulerResources {
@PersistenceContext(name="jndidemo")
@Produces
@Named("jndidemo")
public EntityManager em;
@Stateless
public class TrainSchedulerEJB
extends SchedulerBase implements TrainSchedulerRemote {
@Inject @Named("jndidemo")
private EntityManager em;
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CDI: Method Producer and Annotation
Qualifier
public class SchedulerResources {
Enterprise
Java
@Produces
@JndiDemo
public EntityManager getEM() {
return em;
}
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import static java.lang.annotation.RetentionPolicy.*;
import static java.lang.annotation.ElementType.*;
import javax.inject.Qualifier;
@Qualifier
@Retention(RUNTIME)
@Target({METHOD, FIELD, PARAMETER, TYPE})
public @interface JndiDemo {
}
@Stateless public class TrainSchedulerEJB
extends SchedulerBase implements TrainSchedulerRemote {
@Inject @JndiDemo
private EntityManager em2;
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CDI: JNDI Resource
Enterprise
Java
public class SchedulerResources {
@Resource(mappedName="java:jboss/datasources/ExampleDS")
@Produces
@JndiDemo
public DataSource ds;
@Stateless
public class TrainSchedulerEJB
extends SchedulerBase implements TrainSchedulerRemote {
@Inject @JndiDemo
private DataSource ds;
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CDI: String Resource
Enterprise
Java
public class SchedulerResources {
@Produces
@JndiDemo
public String message="Hello CDI!!!";
@Stateless
public class TrainSchedulerEJB
extends SchedulerBase implements TrainSchedulerRemote {
@Inject @JndiDemo
String message;
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Enterprise
Java
CDI: EJB Resource, @Any, Instance
public class SchedulerResources {
@EJB(lookup="java:app/jndiDemoEJB/CookEJB!ejava.examples.jndidemo.ejb.CookLocal")
@Produces
@Cook
public Scheduler cook;
@Stateless
public class TrainSchedulerEJB
extends SchedulerBase implements TrainSchedulerRemote {
@Inject @Any
protected Instance<Scheduler> anyCook;
protected Scheduler cook2;
import javax.enterprise.util.AnnotationLiteral;
public class CookQualifier extends AnnotationLiteral<Cook>
}
{
cook2 = anyCook.select(new CookQualifier()).get();
28
CDI: Bean Resource
Enterprise
Java
@Named
public class JPASchedulerDAOImpl
extends JPADAOBase<Task>
implements SchedulerDAO {
…
(assignable)
@Stateless
public class TrainSchedulerEJB
extends SchedulerBase implements TrainSchedulerRemote {
@Inject
protected SchedulerDAO schedulerDAO;
@Inject
protected JPASchedulerDAOImpl jpaSchedulerDAOImpl;
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CDI: Bean Resource and @Typed
Enterprise
Java
@Typed({SchedulerDAO.class, JPASchedulerDAOImpl.class})
public class JPASchedulerDAOImpl
extends JPADAOBase<Task>
implements SchedulerDAO {
…
(not assignable)
@Stateless
public class TrainSchedulerEJB
extends SchedulerBase implements TrainSchedulerRemote {
@Inject
protected SchedulerDAO schedulerDAO;
@Inject
protected JPASchedulerDAOImpl jpaSchedulerDAOImpl;
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CDI: Injecting into POJOs
Enterprise
Java
public class JPASchedulerDAOImpl
@Inject @Named("jndidemo")
public void setEntityManager(EntityManager em) {
super.em = em;
}
@Override
public String toString() {
return new StringBuilder(super.toString())
.append(", em=" + em).toString();
}
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31
CDI: @PostConstruct
Enterprise
Java
@PostConstruct
public void init() {
log.info("******************* TrainScheduler Created ******************");
log.debug("ctx=" + ctx);
log.debug("em=" + em);
log.debug("em=" + em2);
log.debug("ds=" + ds);
log.debug("message=" + message);
log.debug("cook=" + cook);
cook2 = anyCook.select(new CookQualifier()).get();
log.debug("cook2=" + cook2);
log.debug("schedulerDAO=" + schedulerDAO);
log.debug("jpaSchedulerDAOImpl=" + jpaSchedulerDAOImpl);
}
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32
CDI: Population Output
Enterprise
Java
******************* TrainScheduler Created ******************
ctx=org.jboss.as.ejb3.context.SessionContextImpl@1b9d518
em=org.jboss.as.jpa.container.TransactionScopedEntityManager@1553d64
em=org.jboss.as.jpa.container.TransactionScopedEntityManager@131a01b
ds=org.jboss.jca.adapters.jdbc.WrapperDataSource@1839aa9
message=Hello CDI!!!
cook=Proxy for view class: ejava.examples.jndidemo.ejb.CookLocal of EJB: CookEJB
cook2=Proxy for view class: ejava.examples.jndidemo.ejb.CookLocal of EJB: CookEJB
schedulerDAO=ejava.examples.jndidemo.dao.JPASchedulerDAOImpl@106504d,
em=org.jboss.as.jpa.container.TransactionScopedEntityManager@18215b6
jpaSchedulerDAOImpl=ejava.examples.jndidemo.dao.JPASchedulerDAOImpl@15f65a1,
em=org.jboss.as.jpa.container.TransactionScopedEntityManager@931d5
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CDI: beans.xml
Enterprise
Java
• ***REQUIRED***
– Triggers CDI Processing
• META-INF/beans.xml for EJBs
• WEB-INF/beans.xml for WARs
• Can be empty
<beans xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/beans_1_0.xsd">
</beans>
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34
JNDI Clients
Enterprise
Java
• Portable EJB JNDI Names
• RMI Clients
– JBoss Remoting
– JBoss EJB Client
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Portable JNDI Names
Enterprise
Java
• EJB Spec defines a standard naming scheme
java:global[/<app-name>]/<module-name>/<bean-name>[!<fully-qualified-interface-name>]
– “java:” - JNDI naming strategy
– “global” – JNDI context
– app-name – used only when packaged in .ear
• Defaults to EAR basename
• Can be specified in application.xml#application-name
– module-name – name of module housing session bean
• Defaults to module.ejb archive basename
• Can be specified in ejb-jar.xml#module-name or web.xml#module-name
– bean-name
• Set to EJB bean-name
• EJB bean-name can be set using @annotation or ejb-jar.xml
– fully-qualified-interface-name
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36
Other Contexts
Enterprise
Java
• java:app
– Unique namespace within deployed application
java:app/<module-name>/<bean-name>[!<fully-qualified-interface-name>]
• java:module
– Unique namespace within deployed module
java:module/<bean-name>[!<fully-qualified-interface-name>]
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37
Example Application
|-|-|
`--
Enterprise
Java
jndiDemoEJB.jar
lib
`-- ejava-util-3.0.2012.2-SNAPSHOT.jar
META-INF
`-- application.xml
<application xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/application_6.xsd" version="6">
<application-name>jndiDemoEAR</application-name>
<display-name>jndiDemoEAR</display-name>
<module>
<ejb>jndiDemoEJB.jar</ejb>
</module>
<library-directory>lib</library-directory>
</application>
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38
Forming the JNDI Name
Enterprise
Java
java:global/jndiDemoEAR/jndiDemoEJB/CookEJB!ejava.examples.jndidemo.ej
b.CookLocal
<application ...>
<application-name>jndiDemoEAR</application-name>
<display-name>jndiDemoEAR</display-name>
<module>
<ejb>jndiDemoEJB.jar</ejb>
</module>
<library-directory>lib</library-directory>
</application>
@Stateless
public class CookEJB implements CookLocal {
package ejava.examples.jndidemo.ejb;
@Local
public interface CookLocal {
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39
Example: Deployed JNDI Tree
Enterprise
Java
• Internal Names
java:global/jndiDemoEAR/jndiDemoEJB/AidScheduler!ejava.examples.jndidemo.ejb.AidSchedulerLocal
java:app/jndiDemoEJB/AidScheduler!ejava.examples.jndidemo.ejb.AidSchedulerLocal
java:module/AidScheduler!ejava.examples.jndidemo.ejb.AidSchedulerLocal
java:global/jndiDemoEAR/jndiDemoEJB/AidScheduler!ejava.examples.jndidemo.ejb.AidSchedulerRemote
java:app/jndiDemoEJB/AidScheduler!ejava.examples.jndidemo.ejb.AidSchedulerRemote
java:module/AidScheduler!ejava.examples.jndidemo.ejb.AidSchedulerRemote
• (JBoss) External Names
java:jboss/exported/jndiDemoEAR/jndiDemoEJB/AidScheduler!ejava.examples.jndidemo.ejb.AidSchedulerR
emote
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40
JBoss Remoting
Enterprise
Java
• (JBoss) jndi.properties
java.naming.factory.initial=org.jboss.naming.remote.client.InitialContextFactory
java.naming.factory.url.pkgs=
java.naming.provider.url=remote://127.0.0.1:4447
java.naming.security.principal=known
java.naming.security.credentials=password
jboss.naming.client.ejb.context=true
• (JBoss) Client JNDI Name
jndiDemoEAR/jndiDemoEJB/AidScheduler!ejava.examples.jndidemo.ejb.AidSchedulerRemote
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41
JBoss EJB Client
Enterprise
Java
• (JBoss) jndi.properties
java.naming.factory.initial=
java.naming.factory.url.pkgs=org.jboss.ejb.client.naming
java.naming.provider.url=
java.naming.security.principal=
java.naming.security.credentials=
• jboss-ejb3.properties
remote.connections=default
remote.connection.default.host=127.0.0.1
remote.connection.default.port=4447
remote.connectionprovider.create.options.org.xnio.Options.SSL_ENABLED=false
• (JBoss) Client JNDI Name
–
ejb:jndiDemoEAR/jndiDemoEJB//AidScheduler!ejava.examples.jndidemo.ejb.AidSchedulerRemote
–
ejb:jndiDemoEAR/jndiDemoEJB//AidScheduler!ejava.examples.jndidemo.ejb.AidSchedulerRemote?stateful
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JNDI ENC
42
Client Lookup
Enterprise
Java
String jndiName=…
javax.naming.Context jndi =
new javax.naming.InitialContext();
AidScheduerRemote scheduler =
(AidSchedulerRemote)jndi.lookup(jndiName);
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Summary
Enterprise
Java
• Populate
– XML
– Annotations
– CDI
• Lookup
– JNDI
– SessionContext
• Property Assignment
– Lookup
– Dependency Injection
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References
Enterprise
Java
• “Enterprise JavaBeans 3.0, 5th Edition”; Burke &
Monsen-Haefel; ISBN 0-596-00978-X; O'Reilly
• JSR 299: Contexts and Dependency Injection for the
JavaTM EE platform
– http://www.jcp.org/en/jsr/detail?id=299
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