I am setting up basic environment for learning CDI in JavaEE7. I have the following code for starting Weld. Just a startup and shutdown.
package com.anshbansal;
import org.jboss.weld.environment.se.Weld;
import org.jboss.weld.environment.se.WeldContainer;
public class Main {
public static void main(String[] args) {
Weld weld = new Weld();
WeldContainer container = weld.initialize();
weld.shutdown();
}
}
I am getting following on my console.
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/D:/Softs/Programming/Java/Java%20JARs/JBoss%20Weld-2.0.3/jar/weld-se.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/D:/Softs/Programming/Java/Java%20JARs/JBoss%20Weld-2.0.3/jar/weld-servlet.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.SimpleLoggerFactory]
[main] INFO org.jboss.weld.Version - WELD-000900 2.0.3 (Final)
[main] INFO org.jboss.weld.Bootstrap - WELD-000101 Transactional services not available. Injection of @Inject UserTransaction not available. Transactional observers will be invoked synchronously.
log4j:WARN No appenders could be found for logger (org.jboss.logging).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
The problematic line is WELD-000101 Transactional services not available. Injection of @Inject UserTransaction not available. Transactional observers will be invoked synchronously.. This simply means that Dependency injection will not work. But I am not sure what is the problem. I have added weld-se.jar in my CLASSPATH. I have not even reached the point of initializing an object then why is this problem occurring?
Weld's official documentation also gives same code which I got after reading this answer. The same code is used in the book "Beginning Java EE 7" by "Antonio Goncalves". I have verified the imports from this github location. So if I have used correct class path and have not created any object then why is this problem occurring?
Running Java EE application requires an Application server (or container). This container makes your life far simple regarding the integration of different services (security, messaging, transaction, etc...) needed to run an enterprise application.
If you don't use an application server (like you are doing in your example) you have to make this integration yourself (i.e build your own server). That's a very hard and useless task since servers exist.
The code you show in your question is how you can use the proprietary part of Weld to start a CDI container by hand when you don't want or can use a container.
If you read carefully Antonio's book, you'll see that on page xxxiv in section 'Download and Running the Code' it is stated that you need to deploy your code on Glassfish 4, one of the open source Java EE 7 server (the other being JBoss Wildfly)
Appendix A of the book (page 539) describe in a very precise way how to set up your environment to run book examples and simple Java EE applications. Please follow instruction in this part and you'll see that developing and deploying Java EE 7 application si very simple.