Sling Model Inject Annotation

Hi ​@nsvsrk 
Not its not true. Using Sling Model @Inject Annotation, does not copy the JCR node but try to find a resource with that type and adapt it.
You can also try to adapt a resource and update it. but I would recommend to use Sling API instead of JCR Node API to update resource/node.
https://www.javadoc.io/doc/org.apache.sling/org.apache.sling.api/2.16.0/org/apache/sling/api/resource/ModifiableValueMap.html

Hi ​@nsvsrk 

It is not possible. The @Inject annotation is for adapting the object to the closest possible type by the Sling Models Injector.

To "reverse" the process, you need to obtain a ModifiableValueMap from the resource. Here is the standard pattern:

public void updateNodeProperty(ResourceResolver resolver, String path, String newValue) {

    Resource resource = resolver.getResource(path);

    if (resource != null) {

        ModifiableValueMap map = resource.adaptTo(ModifiableValueMap.class);

        if (map != null) {
            map.put("myProperty", newValue);
            try {
                resolver.commit();
            } catch (PersistenceException e) {
                // Handle error
            }
        }
    }
}

Hi ​@nsvsrk ,

No, @Inject in Sling Models is read‑only. It only helps populate your model fields from the current Resource / ValueMap. It does not write back to JCR.

To update JCR from Java, you must use the Sling Resource API (recommended) or JCR API directly.

How to “reverse” it correctly:

Use ResourceResolver -> Resource -> ModifiableValueMap:

import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceResolver;
import org.apache.sling.api.resource.ModifiableValueMap;

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

    @Inject
    private Resource resource;

    public void updateTitle(String newTitle) {
        ResourceResolver resolver = resource.getResourceResolver();

        ModifiableValueMap mvm = resource.adaptTo(ModifiableValueMap.class);
        if (mvm != null) {
            mvm.put("jcr:title", newTitle);
            resolver.commit(); // persist changes
        }
    }
}

Key points:

• @Inject is for reading.
• For writing, adapt to ModifiableValueMap, set properties, then call resource.getResourceResolver().commit() (handle exceptions/transactions as needed).
• Official API reference: https://www.javadoc.io/doc/org.apache.sling/org.apache.sling.api/2.16.0/org/apache/sling/api/resource/ModifiableValueMap.html

​@nsvsrk Quick follow-up! Were you able to get this issue sorted out? If you did, please consider posting the solution you used so others can learn from it. And if any of the replies above were helpful—whether they fully solved your problem or just pointed you toward the right fix—marking one as accepted helps future community members find solutions more easily. Closing the loop here makes a real difference for everyone.