How to configure Weld in Tomcat for CDI?

Question

I used Netbeans.

This is what I did.

I used Maven dependency.

org.jboss.weld weld-osgi-bundle 3.0.0.Alpha8

Now, as stated in their official documentation, I created Web Pages/META-INF/context.xml with this content:

  auth="Container"

  type="javax.enterprise.inject.spi.BeanManager"

  factory="org.jboss.weld.resources.ManagerObjectFactory"/>

mas is the root in case of my project!!

But, it DIFFERS in here, weld documentation only include without other parameters.

and, I also created beans.xml in WEB-INF folder, which looks like this..

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://xmlns.jcp.org/xml/ns/javaee"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee    http://xmlns.jcp.org/xml/ns/javaee/beans_1_1.xsd"
   bean-discovery-mode="annotated">
    </beans>

But, it doesn't say so.

And, I added in web.xml

<resource-env-ref>

        <resource-env-ref-name>BeanManager</resource-env-ref-name>

        <resource-env-ref-type>

            javax.enterprise.inject.spi.BeanManager

        </resource-env-ref-type>

    </resource-env-ref>

And, to test if this works or not, I created POJO which had setters and getters, and annotated with @Named and @Dependent. It looked sth like this.

@Named
@Dependent
public class Foo{

    String s1="foo", s2="bar";

    //setters and getters for those!!


}

And, craeted servlet through setup in netbeans.

I added sth like this:

@Inject Foo foo;

And, in the method

protected void processRequest(HttpServletRequest request, HttpServletResponse response)



           throws ServletException, IOException {
    //printwriter out configured

        out.append(foo.gets1());




}

The exception is NullPointerException, and it is definitely because of Foo class, that I expected CDI to work, but it doesn't.

So, the question is, how to configure CDI in Tomcat?

Why are you using weld osgi? Do you have an OSGi runtime in your app? You might want weld servlet instead. Also, I would stick with 2.2.x releases as 3.0 is in early alpha. — John Ament, May 03 '15 at 16:13

score 0 · Answer 1 · answered May 05 '15 at 16:14

CDI is not supported by tomcat out of the box, you could use TomEE to resolve this. Alternatively, you could add the weld servlet jar to WEB-INF/lib folder. A detailed process is provided HERE.

Using Maven, add this dependancy:

<dependency>
    <groupId>org.jboss.weld.servlet</groupId>
    <artifactId>weld-servlet</artifactId>
    <version>2.2.11.Final</version>
</dependency>

How to configure Weld in Tomcat for CDI?

1 Answers1