Search code examples
annotationsosgiadobeaemsling

AEM Osgi Sling Model @PostConstruct never called

I am having an issue with the javax.annotation.PostConstruct annotation in my Sling model.

My html file that uses my model:

<div data-sly-use="com.company.platform.component.general.textblockvalidator.TextBlockValidatorModel" data-sly-unwrap />

Model:

import org.apache.sling.api.resource.ResourceResolver;
import org.apache.sling.models.annotations.Model;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.PostConstruct;
import javax.inject.Inject;

@Model(adaptables = org.apache.sling.api.resource.Resource.class)
public class TextBlockValidatorModel {

    @PostConstruct
    private void init() {
        System.out.println();
    }

    public String getValidate(){
        return "This works";
    }
}

I can call the getter from my sightly file but I never seem to enter my @PostConstruct init() method.

IntelliJ does give me a warning on the annotation but I am not sure what I am doing wrong:

enter image description here

Sling-model-packages:

<Sling-Model-Packages>
   ...
   com.asadventure.platform.component
   ...
</Sling-Model-Packages>

enter image description here

Any ideas? Thanks in advance!

Solution

  • First, check your Sling Model has been registered correctly by looking for your class in this web page: http://localhost:4502/system/console/status-adapters

    If it isn't listed there, you most likely have not specified the <Sling-Model-Packages> property of the maven-bundle-plugin.

    I would also try changing the access modifier for the init method to protected or public.

    UPDATE:

    I've created a sample project for AEM 6.1 demonstrating the use of the @PostConstruct annotation.

    The Sling Model class:

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

    private boolean postContructCalled = false;

    @PostConstruct
    public void init() {
        this.postContructCalled = true;
    }

    public boolean isPostContructCalled() {
        return this.postContructCalled;
    }
}

    And a simple HTL component:

    <sly data-sly-use.model="com.github.mickleroy.models.SampleModel">
    <p>@PostConstruct was called: ${model.postContructCalled}</p>
</sly>

    Please take note of the use of the data-sly-use directive - you need to provide a model name.

    Also, as I mentioned in the comments, you should not be adding javax.annotation-api as a dependency as it is part of the JDK.

    Full source available here: https://github.com/mickleroy/sling-models-sample