CODEWITHSUNDEEP
javamavenjakarta-eedependency-injectioncdi
Beau Johnny Bekkestad
Beau Johnny Bekkestad

Reputation: 381

why can i not get the injection to work?

I have a project and i am trying to inject my service, but i keep getting null pointer exception injecting the UserService. And i cannot figure out what i am missing.

I added the project to my github, https://github.com/JohnnyBekkestad/demo, mind you that in order to focus on the problem i removed a lot of code to clean it up.

If anyone can see what i am missing i would gratefully appreciate it.

Best Regards Johnny

Upvotes: 0

Views: 102

Answers (2)

swarley
swarley

Reputation: 365

Check out this tutorial if using Tomcat and remember to add beans.xml, to change web.xml and incluce / exclude the not necessary dependencies (weld). Furthermore there is no such annotation pair

@Path 
@ManagedBean

Remember: JAX-RS (or in your case Jersey) tells you, when it finds any implementation, which means @Path is enough:

INFO: Root resource classes found:
   class com.bekkestad.demo.web.rest.UserController

And as a starter: Tomcat is no Java EE container. If using GlassFish 4 then get comfortable with Java EE first (@EJB > @Stateless) then add CDI capability - but then you do not have to add any dependencies since weld is already available (= no context.xml or changes in web.xml needed, just a beans.xml in WEB-INF and also in all other projects META-INF directories).

Upvotes: 0

John Ament
John Ament

Reputation: 11733

Your WAR file is missing a beans.xml file here: https://github.com/JohnnyBekkestad/demo/tree/master/web/rest/src/main/webapp/WEB-INF

Assuming that you're trying to inject the service here and this is where the NPE Is coming from:

https://github.com/JohnnyBekkestad/demo/blob/master/web/rest/src/main/java/se/johnny/demo/web/rest/UserController.java

Upvotes: 2

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