Appian Plugin Deploys Successfully but No Modules Appear in Admin Console (Expression Function)

Title:
Appian Plugin Deploys Successfully but No Modules Appear in Admin Console (Expression Function)

Question:

Hello everyone,

I am developing a simple Appian expression function plugin using Java and Maven in Spring Tool Suite (STS) for Appian 24.1 On-Prem.

The plugin deploys successfully in Admin Console, but the Modules column is empty, so the function does not appear in the Expression Editor and cannot be used in an Expression Rule.

What I have done so far:

1. Created a simple Java class:

package com.example;

import com.appiancorp.suiteapi.expression.annotations.Function;
import com.appiancorp.suiteapi.expression.annotations.Parameter;

public class HelloPlugin {

    @Function
    public static String hello(@Parameter String name) {
        return "Hello " + name + " from plugin";
    }

}

2. Created appian-plugin.xml:

<appian-plugin key="hello-plugin"
               name="Hello Plugin"
               description="Simple expression function plugin"
               version="1.0.0"
               vendor="Example">

    <functions>
        <function>com.example.HelloPlugin</function>
    </functions>

</appian-plugin>

3. Project structure:

src/main/java/com/example/HelloPlugin.java
src/main/resources/META-INF/appian-plugin.xml

4. Built the plugin using:

mvn clean package

5. Uploaded the generated JAR in Admin Console → Plug-ins.

The plugin installs successfully, but the Modules column remains empty, and the function hello() does not appear in the expression editor.

Questions:

• What could cause a plugin to deploy successfully but not register any modules?

• Is there any additional configuration required for expression function plugins in Appian 24.1?

• Could this be related to the plugin packaging or manifest configuration?

Any guidance would be appreciated.

Thanks!