Weld not initializing properly

Question

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?

Answer 1

Your setup is ok for learning CDI in Java SE.

For using CDI in Java EE, you obviously need a Java EE Container, a plain old application with a main method won't do.

Weld is simply telling you that transactions are not available (since you're not running in an EE container), so any transaction-related CDI features will be disabled.

Dependency injection will work in your case, as long as you don't try to inject any Java EE objects or use any CDI features that require a Java EE container.