Yes you can:)
By using CDI, if supported by your container you can use the
@Inject annotation to inject a POJO. Remember that you also need a beans.xml bundled with your application, this is the way the container knows it should enable CDI for your application.
do @Inject annotation comes with java 1.6 if i am not worng, but my ejb 3 runs on java 1.5 ?
It depends on which application server you want to run you application and also which version of the application server. I think CDI was introduced as part of Java EE 6, so you should see if your application server supports Java EE 6.