Calling Custom Utility Methods in JSP

[bob_smith1]

I am currently trying to call a custom java utility function that I wrote in the bundle section of my cq5 code. I am calling this from a components jsp.

In my common bundle I have a utility class under src/main/java. My package is something like com.test.utility and my file is jcrUtility.java. Inside the java file I have something like:

public static ArrayList<String> propertyToArrayList(Node n) { ... }

In my component's jsp file I have something like this:

<% page import="com.test.utility.jcrUtility"%> <% ArrayList<String> propList = jcrUtility.propertyToArrayList(currentNode); %>

In both my java class and my jsp file I have the correct other libraries imported such as java.util.ArrayList, javax.jcr.Node, etc. I have also compiled my OSGI bundle and updated it in the Bundles web console.

The current exception I am receiving is as follows:

org.apache.sling.api.scripting.ScriptEvaluationException: org.apache.sling.scripting.jsp.jasper.JasperException: Unable to compile class for JSP: The method propertyToArrayList(Node n) is undefined for the type jcrUtility

Also, I have checked and my bundle is "Active" and my package is in the "Export Package". mported.

I am not sure what the problem is considering the java in my utility class and the java in my jsp looks sound. Any help would be appreciated.

[smacdonald2008 · Accepted solution]

Few things look funny about this. 

First - i would build the backend OSGi service using @component and @service annotations. You can use Maven too and define a Java Interface:

package com.test.utility;
 
public interface jcrUtility {
      public static ArrayList<String> propertyToArrayList(Node n)
 }

Then define an implementation class in the same package:

//This is a component so it can provide or consume services
@Component
   
@Service
public class jcrUtilityImpl implements jcrUtility{

//implementation code

}

Build and deploy - build via Maven.

Then in your JSP code that invokes the service, use sling.getService().

com.test.utility.jcrUtility jUtilService = sling.getService(com.test.utility.jcrUtility.class);

jUtilService.propertyToArrayList(node);

Now - we have all this information in an end to end community article  - including how to pass nodes. See:

Passing JCR Node Objects to Adobe Experience Manager Custom Services