log.info

[bartdp]

Hi,

I have a question about the logging.
I want to know the flow of the application so I put some logger information in the code, first the class name and then the method name.

Example:

     public void setUsername(String username) {
          log.info("...User...setUsername...");
          this.username = username;
     }

When I run the application I get an error on this log.info, a nullpointerexception. Why?

[chawax]

How do you inject log in your component ?
What did you write in log config file ?
It would be nice to post the entire class, not only the line where you have the NPE ;)

[asiandub]

why? because the variable log is null...

a rough guess: the logger has not been injected by Seam.
- do you use the logger in the constructor? this is called before @In is executed

you call always fall back to conventional logging

private static final Logger LOGGER = Logger.getLogger(MyClass.class);

btw:
class and method-name are in the standard logging output of the appender, no need to log that...

hope that helps,
pls post more code otherwise,

cheers,
Jan

[bartdp]

Ok, more information sounds logical.

I used the annotation @Logger in my class, so the code is:

@Entity
@Table(name = "users")
public class User implements Serializable {
     @Logger
     private Log log;

     private static final long serialVersionUID = 1L;

     private int id;
     private String username;

     @Column(name = "userid")
     public int getId() {
          log.info("...User...getId...");
          return id;
     }

     public void setId(int id) {
          log.info("...User...setId...");
          this.id = id;
     }

     @Column(name = "username")
     public String getUsername() {
          log.info("...User...getUsername...");
          return username;
     }

     public void setUsername(String username) {
          log.info("...User...setUsername...");
          this.username = username;
     }

And regarding the book, Seam in action, injecting a @Logger instance, seam can automatically create an instance of a logger that is configured exclusively for the component into which it is injected.

[asiandub]

code looks good :-)

one possible explanation is that the seam interceptor is not registered at all.

•   do you have ejb-jar.xml in the META-INF directory of your EAR-Project?

•   do other @In-annotations of EJB-components work?

cheers,
jan