Java EE 8 is moving along and several new component JSRs have been filed. JSR 365 will define the specification for CDI 2.0. Red Hat has already started working on the implementation prototype in Weld 3 and Alpha3 was released recently.

The Java EE 8 compliant application server from Red Hat will be WildFly where all the different technologies will be implemented. In the meanwhile, how do you try out these early experimental releases?

Tech Tip #29 showed how to patch WildFly 8.x from a previous release. This tip will leverage that mechanism to install Weld 3 Alpha3 in WildFly 8.2. You can also download Weld 3 Alpha3 Standalone or Weld 3 Alpha3 as patch to WildFly 9.0 Alpha1.

The instructions are rather simple:

1. Download and unzip WildFly 8.2:
   
   http://download.jboss.org/wildfly/8.2.0.Final/wildfly-8.2.0.Final.zip unzip wildfly-8.2.0.Final.zip

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   http://download.jboss.org/wildfly/8.2.0.Final/wildfly-8.2.0.Final.zip unzip wildfly-8.2.0.Final.zip

2. Download Weld 3 Alpha3 Patch for WildFly 8.2:
   
   curl -L -o weld3-alpha3-patch-wildfly8.2.zip http://sourceforge.net/projects/jboss/files/Weld/3.0.0.Alpha3/wildfly-8.2.0.Final-weld-3.0.0.Alpha3-patch.zip/download

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   curl -L -o weld3-alpha3-patch-wildfly8.2.zip http://sourceforge.net/projects/jboss/files/Weld/3.0.0.Alpha3/wildfly-8.2.0.Final-weld-3.0.0.Alpha3-patch.zip/download

3. Apply the patch as (also available in README bundled in the patch):
   
   ./wildfly-8.2.0.Final/bin/jboss-cli.sh --command="patch apply ./weld3-alpha3-patch-wildfly8.2.zip" { "outcome" : "success", "result" : {} }

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   ./wildfly-8.2.0.Final/bin/jboss-cli.sh --command="patch apply ./weld3-alpha3-patch-wildfly8.2.zip" {     "outcome" : "success",     "result" : {} }

4. Start WildFly:
   
   ./wildfly-8.2.0.Final/bin/standalone.sh

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   ./wildfly-8.2.0.Final/bin/standalone.sh

5. Run a simple CDI test from javaee7-samples:
   
   mvn -f cdi/nobeans-xml/pom.xml test -Dwildfly-remote-arquillian

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   mvn -f cdi/nobeans-xml/pom.xml test -Dwildfly-remote-arquillian

   and see output in the WildFly console as:
   
   20:53:30,434 INFO [org.jboss.as.repository] (management-handler-thread - 1) JBAS014900: Content added at location /Users/arungupta/tools/weld3/wildfly-8.2.0.Final/standalone/data/content/4c/c6675b4f1fb33fe40dda3f94ac4979b3e2a4d0/content 20:53:30,453 INFO [org.jboss.as.server.deployment] (MSC service thread 1-4) JBAS015876: Starting deployment of "test.war" (runtime-name: "test.war") 20:53:30,878 INFO [org.jboss.weld.deployer] (MSC service thread 1-5) JBAS016002: Processing weld deployment test.war 20:53:30,953 INFO [org.hibernate.validator.internal.util.Version] (MSC service thread 1-5) HV000001: Hibernate Validator 5.1.3.Final 20:53:31,131 INFO [org.jboss.weld.deployer] (MSC service thread 1-5) JBAS016005: Starting Services for CDI deployment: test.war 20:53:31,163 INFO [org.jboss.weld.Version] (MSC service thread 1-5) WELD-000900: 3.0.0 (Alpha3) 20:53:31,195 INFO [org.jboss.weld.deployer] (MSC service thread 1-9) JBAS016008: Starting weld service for deployment test.war 20:53:32,141 INFO [org.wildfly.extension.undertow] (MSC service thread 1-15) JBAS017534: Registered web context: /test 20:53:32,178 INFO [org.jboss.as.server] (management-handler-thread - 1) JBAS018559: Deployed "test.war" (runtime-name : "test.war") 20:53:33,454 INFO [org.wildfly.extension.undertow] (MSC service thread 1-6) JBAS017535: Unregistered web context: /test 20:53:33,464 INFO [org.jboss.weld.deployer] (MSC service thread 1-16) JBAS016009: Stopping weld service for deployment test.war 20:53:33,490 INFO [org.jboss.as.server.deployment] (MSC service thread 1-12) JBAS015877: Stopped deployment test.war (runtime-name: test.war) in 40ms 20:53:33,497 INFO [org.jboss.as.repository] (management-handler-thread - 1) JBAS014901: Content removed from location /Users/arungupta/tools/weld3/wildfly-8.2.0.Final/standalone/data/content/4c/c6675b4f1fb33fe40dda3f94ac4979b3e2a4d0/content 20:53:33,498 INFO [org.jboss.as.server] (management-handler-thread - 1) JBAS018558: Undeployed "test.war" (runtime-name: "test.war")

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   20:53:30,434 INFO  [org.jboss.as.repository] (management-handler-thread - 1) JBAS014900: Content added at location /Users/arungupta/tools/weld3/wildfly-8.2.0.Final/standalone/data/content/4c/c6675b4f1fb33fe40dda3f94ac4979b3e2a4d0/content 20:53:30,453 INFO  [org.jboss.as.server.deployment] (MSC service thread 1-4) JBAS015876: Starting deployment of "test.war" (runtime-name: "test.war") 20:53:30,878 INFO  [org.jboss.weld.deployer] (MSC service thread 1-5) JBAS016002: Processing weld deployment test.war 20:53:30,953 INFO  [org.hibernate.validator.internal.util.Version] (MSC service thread 1-5) HV000001: Hibernate Validator 5.1.3.Final 20:53:31,131 INFO  [org.jboss.weld.deployer] (MSC service thread 1-5) JBAS016005: Starting Services for CDI deployment: test.war 20:53:31,163 INFO  [org.jboss.weld.Version] (MSC service thread 1-5) WELD-000900: 3.0.0 (Alpha3) 20:53:31,195 INFO  [org.jboss.weld.deployer] (MSC service thread 1-9) JBAS016008: Starting weld service for deployment test.war 20:53:32,141 INFO  [org.wildfly.extension.undertow] (MSC service thread 1-15) JBAS017534: Registered web context: /test 20:53:32,178 INFO  [org.jboss.as.server] (management-handler-thread - 1) JBAS018559: Deployed "test.war" (runtime-name : "test.war") 20:53:33,454 INFO  [org.wildfly.extension.undertow] (MSC service thread 1-6) JBAS017535: Unregistered web context: /test 20:53:33,464 INFO  [org.jboss.weld.deployer] (MSC service thread 1-16) JBAS016009: Stopping weld service for deployment test.war 20:53:33,490 INFO  [org.jboss.as.server.deployment] (MSC service thread 1-12) JBAS015877: Stopped deployment test.war (runtime-name: test.war) in 40ms 20:53:33,497 INFO  [org.jboss.as.repository] (management-handler-thread - 1) JBAS014901: Content removed from location /Users/arungupta/tools/weld3/wildfly-8.2.0.Final/standalone/data/content/4c/c6675b4f1fb33fe40dda3f94ac4979b3e2a4d0/content 20:53:33,498 INFO  [org.jboss.as.server] (management-handler-thread - 1) JBAS018558: Undeployed "test.war" (runtime-name: "test.war")

   Note that the Weld version of “3.0.0 (Alpha 3)” is shown appropriately in the logs.

In terms of features, here is what is available so far:

• Declarative ordering of observer methods using @Priority
• Ability for an extension to veto and modify an observer method
• Support for Java 8 repeatable annotations as qualifiers and interceptor bindings
• Enhanced AnnotatedType API
• Asynchronous events
• Simplified configuration of Weld-specific properties
• Guava is no longer used internally

More details, including code samples, are explained in Weld 3.0.0 Alpha1 Released and An update on Weld 3. All the prototyped API is in org.jboss.weld.experimental package indicating the early nature.

Here are some resources for you to look at:

• Javadocs
  
• Maven coordinates
  
  <dependency> <groupId>org.jboss.weld</groupId> <artifactId>weld-api</artifactId> <version>3.0.Alpha3</version> </dependency>

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  <dependency>     <groupId>org.jboss.weld</groupId>     <artifactId>weld-api</artifactId>     <version>3.0.Alpha3</version> </dependency>

• Feedback at Weld forums or the cdi-dev mailing list.

Created Java EE 8 Samples repository and will start adding some CDI 2.0 samples there, stay tuned.

Enjoy!