SlingModel still returning null when adapting item

Question

I am trying to get Sling Models working.

I have a simple annotated POJO that maps to a JCR Node by convention as follows:

@Model(adaptables=Resource.class)

public class FlushRule {

@Inject

public String optingRegex;

}

I have set a String value in optingRegex.

When I try to use it:

FlushRule currentRule=rule.adaptTo(FlushRule.class);

Although the correct object is in rule, currentRule is null.

I looked in http://localhost:4502/system/console/adapters and couldn't find any adapters.

Any tips would be appreciated.

score 1 · Accepted Answer · answered Jul 24 '14 at 13:59

1

You need to add following lines to the maven-bundle-plugin configuration in your pom.xml:

<configuration>
  <instructions>
    <Sling-Model-Packages>
      org.apache.sling.models.it.models
    </Sling-Model-Packages>
  </instructions>
</configuration>

where org.apache.sling.models.it.models is the Java package containing your models. The configured package (and all its subpackages) will be scanned for @Models. More information can be found on the Sling website.

answered Jul 24 '14 at 13:59

Tomek Rękawek

9,204
2
27
43

Thanks. I knew I did something stupid. Unfortunately, I seem to be doing something else stupid as well, as the adapter is not registered and I'm thus still getting a null when I try to adapt. Do you know of a good approach to debug? – Bayani Portier Jul 24 '14 at 23:48

score 0 · Answer 2 · answered Jan 30 '19 at 12:51

Another reason why the Sling Model object could be null is when the Sling Model has a parameterised constructor and no default constructor.

Example:

@Model(adaptables = Resource.class)
public class CompetitionRound {

    @Inject
    String round;

    public CompetitionRound(String round) { 
        this.round = round;
    }

}

Add a default constructor and it should work.

@Model(adaptables = Resource.class)
public class CompetitionRound {

    @Inject
    String round;

    public CompetitionRound() {

    }   

    public CompetitionRound(String round) { 
        this.round = round;
    }

}

SlingModel still returning null when adapting item

2 Answers2