---
title: "Java"
slug: "cloudfunctions-example-java"
tags: ["Cloud Functions", "Cloud Functions examples"]
updated: 2026-09-17T09:18:17Z
published: 2026-09-17T09:18:17Z
canonical: "guide.ncloud-docs.com/cloudfunctions-example-java"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://guide.ncloud-docs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Java

Available in Classic and VPC

This section describes how to create and use Java actions in a variety of ways, and includes application examples.

## Create an action

Creating Java actions is similar to creating JavaScript and Swift actions.

              Note

              

To compile and test actions, [JDK 8](http://www.oracle.com/technetwork/java/javase/downloads/index.html) must be set up in your local environment.

A Java action is a Java program with a main method. The method must be defined in the following format:

```
public static com.google.gson.JsonObject main(com.google.gson.JsonObject);
```

Considering this requirement, here is an example of creating a Java action:

1. Create a source code file named Hello.java.

```
import com.google.gson.JsonObject;

public class Hello {
    public static JsonObject main(JsonObject args) {
        String name = "World";
        String place = "Naver";
        if (args.has("name"))
            name = args.getAsJsonPrimitive("name").getAsString();
        if (args.has("place"))
            place = args.getAsJsonPrimitive("place").getAsString();

        JsonObject response = new JsonObject();
        response.addProperty("payload", "Hello, " + name + " in " + place + "!");
        return response;
    }
}
```
2. Use the command to compile Hello.java into a JAR file named hello.jar.

```
$ javac Hello.java
```

```
$ jar cvf hello.jar Hello.class
```
3. Upload the generated hello.jar file to create an action named helloJava.

![cloudfunctions-example-java_v2_01_ko](https://cdn.document360.io/6998976f-9d95-4df8-b847-d375892b92c2/Images/Documentation/cloudfunctions-example-java_v2_01_en.png?sv=2026-02-06&spr=https&st=2026-11-14T04%3A24%3A14Z&se=2026-11-14T05%3A24%3A14Z&sr=c&sp=r&sig=Xm%2F5Mcd7%2Bfsgvam0RbX7bLNnwByVAvxqtgxZingnjCs%3D)

> Main class: Set to Hello class.

If the class is not in the default package, you can use the Java fully-qualified class name (FQCN) including the package, such as com.example.MyMain.

![compute-15-2-302_ko](https://cdn.document360.io/6998976f-9d95-4df8-b847-d375892b92c2/Images/Documentation/compute-15-2-302_en.png?sv=2026-02-06&spr=https&st=2026-11-14T04%3A24%3A14Z&se=2026-11-14T05%3A24%3A14Z&sr=c&sp=r&sig=Xm%2F5Mcd7%2Bfsgvam0RbX7bLNnwByVAvxqtgxZingnjCs%3D)

If you want to change the method name of the Java action, you can create an action by specifying a method name like methodName. ![compute-15-2-303_ko](https://cdn.document360.io/6998976f-9d95-4df8-b847-d375892b92c2/Images/Documentation/compute-15-2-303_en.png?sv=2026-02-06&spr=https&st=2026-11-14T04%3A24%3A14Z&se=2026-11-14T05%3A24%3A14Z&sr=c&sp=r&sig=Xm%2F5Mcd7%2Bfsgvam0RbX7bLNnwByVAvxqtgxZingnjCs%3D)

              Caution

              

When compiling Java files, [google-gson](https://github.com/google/gson) must be included in the Java CLASSPATH.